Code reformatted

android-app-tests/src/test/java/org/solovyev/android/AndroidNumeralBaseTest.java

@@ -28,11 +28,11 @@ import org.solovyev.android.calculator.units.CalculatorNumeralBase;
 import org.solovyev.common.units.Unit;
 import org.solovyev.common.units.UnitConverter;
 
-import javax.annotation.Nonnull;
-
 import java.util.Date;
 import java.util.Random;
 
+import javax.annotation.Nonnull;
+
 import static org.junit.Assert.assertTrue;
 
 /**

android-app-tests/src/test/java/org/solovyev/android/calculator/CalculatorBroadcasterTest.java

@@ -4,6 +4,7 @@ import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
+
 import org.hamcrest.BaseMatcher;
 import org.hamcrest.Description;
 import org.junit.Before;
@@ -21,7 +22,9 @@ import static org.mockito.Mockito.verify;
 import static org.robolectric.Robolectric.application;
 import static org.solovyev.android.calculator.CalculatorBroadcaster.ACTION_DISPLAY_STATE_CHANGED;
 import static org.solovyev.android.calculator.CalculatorBroadcaster.ACTION_EDITOR_STATE_CHANGED;
-import static org.solovyev.android.calculator.CalculatorEventType.*;
+import static org.solovyev.android.calculator.CalculatorEventType.display_state_changed;
+import static org.solovyev.android.calculator.CalculatorEventType.editor_state_changed;
+import static org.solovyev.android.calculator.CalculatorEventType.editor_state_changed_light;
 
 @Config(manifest = Config.NONE)
 @RunWith(RobolectricTestRunner.class)

android-app-tests/src/test/java/org/solovyev/android/calculator/CalculatorReceiverTest.java

@@ -1,16 +1,21 @@
 package org.solovyev.android.calculator;
 
 import android.content.Intent;
+
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.Mockito;
 import org.robolectric.RobolectricTestRunner;
 import org.robolectric.annotation.Config;
 
-import static org.mockito.Mockito.*;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
 import static org.robolectric.Robolectric.application;
 import static org.solovyev.android.calculator.CalculatorButton.four;
-import static org.solovyev.android.calculator.CalculatorReceiver.*;
+import static org.solovyev.android.calculator.CalculatorReceiver.ACTION_BUTTON_ID_EXTRA;
+import static org.solovyev.android.calculator.CalculatorReceiver.ACTION_BUTTON_PRESSED;
+import static org.solovyev.android.calculator.CalculatorReceiver.newButtonClickedIntent;
 
 @Config(manifest = Config.NONE)
 @RunWith(RobolectricTestRunner.class)

android-app-tests/src/test/java/org/solovyev/android/calculator/CalculatorTestUtils.java

@@ -23,7 +23,6 @@
 package org.solovyev.android.calculator;
 
 import android.content.Context;
-import jscl.JsclMathEngine;
 
 import org.mockito.Mockito;
 import org.solovyev.android.calculator.history.CalculatorHistory;
@@ -32,6 +31,8 @@ import org.solovyev.android.calculator.plot.CalculatorPlotter;
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
+import jscl.JsclMathEngine;
+
 /**
  * User: serso
  * Date: 10/7/12

android-app-tests/src/test/java/org/solovyev/android/calculator/TextHighlighterTest.java

@@ -23,8 +23,6 @@
 package org.solovyev.android.calculator;
 
 import android.graphics.Color;
-import jscl.MathEngine;
-import jscl.NumeralBase;
 
 import org.junit.Before;
 import org.junit.Test;
@@ -34,6 +32,9 @@ import org.solovyev.android.calculator.view.TextHighlighter;
 import java.util.Date;
 import java.util.Random;
 
+import jscl.MathEngine;
+import jscl.NumeralBase;
+
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;

android-app-tests/src/test/java/org/solovyev/android/calculator/history/HistoryUtilsTest.java

@@ -47,15 +47,9 @@ import static org.junit.Assert.assertEquals;
  */
 public class HistoryUtilsTest {
 
-	@Test
-	public void testFromXml() throws Exception {
-
-	}
-
     private static final String emptyHistory = "<history>\n" +
             "   <historyItems class=\"java.util.ArrayList\"/>\n" +
             "</history>";
-
     private static final String toXml1 = "<history>\n" +
             "   <historyItems class=\"java.util.ArrayList\">\n" +
             "      <calculatorHistoryState>\n" +
@@ -74,7 +68,6 @@ public class HistoryUtilsTest {
             "      </calculatorHistoryState>\n" +
             "   </historyItems>\n" +
             "</history>";
-
     private static final String toXml2 = "<history>\n" +
             "   <historyItems class=\"java.util.ArrayList\">\n" +
             "      <calculatorHistoryState>\n" +
@@ -136,6 +129,11 @@ public class HistoryUtilsTest {
             "   </historyItems>\n" +
             "</history>";
 
+    @Test
+    public void testFromXml() throws Exception {
+
+    }
+
     @Test
     public void testToXml() throws Exception {
         final Date date = new Date(100000000);

android-app-tests/src/test/java/org/solovyev/android/calculator/model/VarTest.java

@@ -22,14 +22,14 @@
 
 package org.solovyev.android.calculator.model;
 
-import jscl.math.function.IConstant;
-
 import org.junit.Test;
 import org.simpleframework.xml.Serializer;
 import org.simpleframework.xml.core.Persister;
 
 import java.io.StringWriter;
 
+import jscl.math.function.IConstant;
+
 import static org.junit.Assert.assertEquals;
 
 /**

android-app-tests/src/test/java/org/solovyev/android/calculator/view/AngleUnitsButtonTest.java

@@ -1,6 +1,7 @@
 package org.solovyev.android.calculator.view;
 
 import android.app.Activity;
+
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -12,8 +13,14 @@ import org.robolectric.shadows.ShadowActivity;
 
 import java.util.ArrayList;
 
-import static jscl.AngleUnit.*;
+import static jscl.AngleUnit.deg;
-import static org.junit.Assert.*;
+import static jscl.AngleUnit.grad;
+import static jscl.AngleUnit.rad;
+import static jscl.AngleUnit.turns;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotSame;
+import static org.junit.Assert.assertTrue;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
 import static org.solovyev.android.calculator.CalculatorTestUtils.staticSetUp;

android-app-tests/src/test/java/org/solovyev/android/calculator/view/NumeralBasesButtonTest.java

@@ -1,6 +1,7 @@
 package org.solovyev.android.calculator.view;
 
 import android.app.Activity;
+
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -12,8 +13,14 @@ import org.robolectric.shadows.ShadowActivity;
 
 import java.util.ArrayList;
 
-import static jscl.NumeralBase.*;
+import static jscl.NumeralBase.bin;
-import static org.junit.Assert.*;
+import static jscl.NumeralBase.dec;
+import static jscl.NumeralBase.hex;
+import static jscl.NumeralBase.oct;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotSame;
+import static org.junit.Assert.assertTrue;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
 import static org.solovyev.android.calculator.CalculatorTestUtils.staticSetUp;

android-app-tests/src/test/java/org/solovyev/android/calculator/wizard/CalculatorWizardActivityTest.java

@@ -26,6 +26,7 @@ import android.content.Intent;
 import android.os.Bundle;
 import android.support.v4.app.Fragment;
 import android.support.v4.app.FragmentManager;
+
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -37,10 +38,15 @@ import org.solovyev.android.wizard.Wizard;
 import org.solovyev.android.wizard.WizardUi;
 import org.solovyev.android.wizard.Wizards;
 
-import javax.annotation.Nonnull;
 import java.lang.reflect.Field;
 
-import static org.junit.Assert.*;
+import javax.annotation.Nonnull;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
 import static org.solovyev.android.calculator.wizard.CalculatorWizardStep.choose_mode;
 
 @RunWith(value = CalculatorTestRunner.class)

android-app-tests/src/test/java/org/solovyev/android/calculator/wizard/CalculatorWizardTest.java

@@ -11,8 +11,15 @@ import org.solovyev.android.wizard.Wizards;
 
 import javax.annotation.Nonnull;
 
-import static org.junit.Assert.*;
+import static org.junit.Assert.assertEquals;
-import static org.solovyev.android.calculator.wizard.CalculatorWizardStep.*;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+import static org.solovyev.android.calculator.wizard.CalculatorWizardStep.choose_mode;
+import static org.solovyev.android.calculator.wizard.CalculatorWizardStep.last;
+import static org.solovyev.android.calculator.wizard.CalculatorWizardStep.welcome;
 
 @RunWith(value = CalculatorTestRunner.class)
 public class CalculatorWizardTest {

android-app-tests/src/test/java/org/solovyev/android/calculator/wizard/OnScreenCalculatorWizardStepTest.java

@@ -30,9 +30,10 @@ import org.robolectric.util.ActivityController;
 import org.solovyev.android.CalculatorTestRunner;
 import org.solovyev.android.wizard.WizardUi;
 
-import javax.annotation.Nonnull;
 import java.lang.reflect.Field;
 
+import javax.annotation.Nonnull;
+
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 

android-app/build.gradle

@@ -55,7 +55,7 @@ android {
 }
 
 repositories {
-    flatDir{
+    flatDir {
         dirs 'misc/libs'
     }
 }
@@ -86,7 +86,7 @@ dependencies {
     compile 'com.google.android.gms:play-services-base:8.4.0'
     compile 'com.google.android.gms:play-services-analytics:8.4.0'
     compile 'com.melnykov:floatingactionbutton:1.1.0'
-    compile(name:'plotter', ext:'aar')
+    compile(name: 'plotter', ext: 'aar')
 
     debugCompile 'com.squareup.leakcanary:leakcanary-android:1.3.1'
     releaseCompile 'com.squareup.leakcanary:leakcanary-android-no-op:1.3.1'

android-app/src/main/AndroidManifest.xml

@@ -1,185 +1,280 @@
 <?xml version="1.0" encoding="utf-8"?>
-<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:installLocation="auto" package="org.solovyev.android.calculator">
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="org.solovyev.android.calculator"
+    android:installLocation="auto">
 
-	<uses-permission android:name="android.permission.VIBRATE"/>
+    <uses-permission android:name="android.permission.VIBRATE" />
-	<uses-permission android:name="android.permission.INTERNET"/>
+    <uses-permission android:name="android.permission.INTERNET" />
-	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
-	<uses-permission android:name="com.android.vending.BILLING"/>
+    <uses-permission android:name="com.android.vending.BILLING" />
-	<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
 
     <!--TODO: REMOVE IN PRODUCTION-->
     <!--<uses-permission android:name="android.permission.DISABLE_KEYGUARD"/>-->
 
     <!-- for onscreen -->
-	<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
+    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
-	<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
+    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
 
-	<supports-screens android:smallScreens="true"/>
+    <supports-screens android:smallScreens="true" />
-	<supports-screens android:normalScreens="true"/>
+    <supports-screens android:normalScreens="true" />
-	<supports-screens android:largeScreens="true"/>
+    <supports-screens android:largeScreens="true" />
-	<supports-screens android:xlargeScreens="true"/>
+    <supports-screens android:xlargeScreens="true" />
-	<supports-screens android:anyDensity="true"/>
+    <supports-screens android:anyDensity="true" />
 
-	<application android:allowBackup="true" android:hardwareAccelerated="true" android:icon="@drawable/ic_launcher" android:label="@string/c_app_name" android:name=".CalculatorApplication" android:theme="@style/Cpp.Theme.Material">
+    <application
+        android:name=".CalculatorApplication"
+        android:allowBackup="true"
+        android:hardwareAccelerated="true"
+        android:icon="@drawable/ic_launcher"
+        android:label="@string/c_app_name"
+        android:theme="@style/Cpp.Theme.Material">
 
         <meta-data
             android:name="com.google.android.gms.version"
             android:value="@integer/google_play_services_version" />
 
-		<activity android:clearTaskOnLaunch="true" android:label="@string/c_app_name" android:launchMode="singleTop" android:name=".CalculatorActivity" android:windowSoftInputMode="adjustPan">
+        <activity
+            android:name=".CalculatorActivity"
+            android:clearTaskOnLaunch="true"
+            android:label="@string/c_app_name"
+            android:launchMode="singleTop"
+            android:windowSoftInputMode="adjustPan">
 
             <intent-filter>
-				<action android:name="android.intent.action.MAIN"/>
+                <action android:name="android.intent.action.MAIN" />
-				<category android:name="android.intent.category.LAUNCHER"/>
+                <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
 
         </activity>
 
-		<receiver android:exported="false" android:name=".CalculatorReceiver">
+        <receiver
+            android:name=".CalculatorReceiver"
+            android:exported="false">
             <intent-filter>
-				<action android:name="org.solovyev.android.calculator.BUTTON_PRESSED"/>
+                <action android:name="org.solovyev.android.calculator.BUTTON_PRESSED" />
             </intent-filter>
         </receiver>
 
-		<activity android:clearTaskOnLaunch="true" android:label="@string/c_app_name" android:launchMode="singleTop" android:name=".CalculatorActivityMobile" android:windowSoftInputMode="adjustPan"/>
+        <activity
+            android:name=".CalculatorActivityMobile"
+            android:clearTaskOnLaunch="true"
+            android:label="@string/c_app_name"
+            android:launchMode="singleTop"
+            android:windowSoftInputMode="adjustPan" />
 
-		<activity android:label="@string/c_app_settings" android:name=".preferences.PreferencesActivity"/>
+        <activity
+            android:name=".preferences.PreferencesActivity"
+            android:label="@string/c_app_settings" />
 
-		<activity android:label="@string/c_history" android:name=".history.CalculatorHistoryActivity"/>
+        <activity
+            android:name=".history.CalculatorHistoryActivity"
+            android:label="@string/c_history" />
 
-		<activity android:excludeFromRecents="true" android:finishOnTaskLaunch="true" android:label="@string/calculation_messages_dialog_title" android:launchMode="singleTask" android:name=".FixableMessagesDialog" android:theme="@style/Cpp.Theme.Dialog.Material"/>
+        <activity
+            android:name=".FixableMessagesDialog"
+            android:excludeFromRecents="true"
+            android:finishOnTaskLaunch="true"
+            android:label="@string/calculation_messages_dialog_title"
+            android:launchMode="singleTask"
+            android:theme="@style/Cpp.Theme.Dialog.Material" />
 
-		<activity android:label="@string/c_about" android:name=".about.CalculatorAboutActivity"/>
+        <activity
+            android:name=".about.CalculatorAboutActivity"
+            android:label="@string/c_about" />
 
-		<activity android:label="@string/c_functions" android:name=".math.edit.CalculatorFunctionsActivity"/>
+        <activity
+            android:name=".math.edit.CalculatorFunctionsActivity"
+            android:label="@string/c_functions" />
 
-		<activity android:label="@string/c_operators" android:name=".math.edit.CalculatorOperatorsActivity"/>
+        <activity
+            android:name=".math.edit.CalculatorOperatorsActivity"
+            android:label="@string/c_operators" />
 
-		<activity android:label="@string/c_vars_and_constants" android:name=".math.edit.CalculatorVarsActivity"/>
+        <activity
-		<activity android:launchMode="singleTop" android:name=".wizard.WizardActivity" android:theme="@style/Cpp.Theme.Wizard">
+            android:name=".math.edit.CalculatorVarsActivity"
+            android:label="@string/c_vars_and_constants" />
+        <activity
+            android:name=".wizard.WizardActivity"
+            android:launchMode="singleTop"
+            android:theme="@style/Cpp.Theme.Wizard">
             <intent-filter>
-				<action android:name="android.intent.action.MAIN"/>
+                <action android:name="android.intent.action.MAIN" />
             </intent-filter>
         </activity>
 
-		<activity android:hardwareAccelerated="false" android:label="@string/c_plot_graph" android:name=".plot.CalculatorPlotActivity"  android:theme="@style/Cpp.Theme.Material"/>
+        <activity
-		<activity android:label="@string/cpp_plot_functions" android:name=".plot.CalculatorPlotFunctionsActivity" android:theme="@style/Cpp.Theme.Dialog.Material"/>
+            android:name=".plot.CalculatorPlotActivity"
-		<activity android:label="@string/cpp_plot_function_settings" android:name=".plot.CalculatorPlotFunctionSettingsActivity" android:theme="@style/Cpp.Theme.Dialog.Material"/>
+            android:hardwareAccelerated="false"
-		<activity android:label="@string/cpp_plot_range" android:name=".plot.CalculatorPlotRangeActivity" android:theme="@style/Cpp.Theme.Dialog.Material"/>
+            android:label="@string/c_plot_graph"
+            android:theme="@style/Cpp.Theme.Material" />
+        <activity
+            android:name=".plot.CalculatorPlotFunctionsActivity"
+            android:label="@string/cpp_plot_functions"
+            android:theme="@style/Cpp.Theme.Dialog.Material" />
+        <activity
+            android:name=".plot.CalculatorPlotFunctionSettingsActivity"
+            android:label="@string/cpp_plot_function_settings"
+            android:theme="@style/Cpp.Theme.Dialog.Material" />
+        <activity
+            android:name=".plot.CalculatorPlotRangeActivity"
+            android:label="@string/cpp_plot_range"
+            android:theme="@style/Cpp.Theme.Dialog.Material" />
 
-		<activity android:label="@string/cpp_purchase_title" android:name=".preferences.PurchaseDialogActivity" android:theme="@style/Cpp.Theme.Dialog.Material"/>
+        <activity
+            android:name=".preferences.PurchaseDialogActivity"
+            android:label="@string/cpp_purchase_title"
+            android:theme="@style/Cpp.Theme.Dialog.Material" />
 
-		<activity android:name=".CalculatorDialogActivity" android:theme="@style/Cpp.Theme.Dialog.Material"/>
+        <activity
+            android:name=".CalculatorDialogActivity"
+            android:theme="@style/Cpp.Theme.Dialog.Material" />
 
         <!-- todo serso: strings-->
-		<activity android:label="@string/c_plot_graph" android:name=".matrix.CalculatorMatrixActivity">
+        <activity
+            android:name=".matrix.CalculatorMatrixActivity"
+            android:label="@string/c_plot_graph">
             <intent-filter>
-				<action android:name="android.intent.action.MAIN"/>
+                <action android:name="android.intent.action.MAIN" />
             </intent-filter>
         </activity>
 
-		<activity android:name=".widget.CalculatorWidgetConfigurationActivity" android:theme="@style/cpp_metro_blue_theme">
+        <activity
+            android:name=".widget.CalculatorWidgetConfigurationActivity"
+            android:theme="@style/cpp_metro_blue_theme">
             <intent-filter>
-				<action android:name="android.appwidget.action.APPWIDGET_CONFIGURE"/>
+                <action android:name="android.appwidget.action.APPWIDGET_CONFIGURE" />
             </intent-filter>
         </activity>
 
         <!-- ONSCREEN CONFIG -->
 
-		<activity android:icon="@drawable/ic_launcher_window" android:label="@string/c_app_name_on_screen" android:launchMode="singleInstance" android:name=".onscreen.CalculatorOnscreenStartActivity" android:theme="@style/Cpp.Theme.Dialog.Material">
+        <activity
+            android:name=".onscreen.CalculatorOnscreenStartActivity"
+            android:icon="@drawable/ic_launcher_window"
+            android:label="@string/c_app_name_on_screen"
+            android:launchMode="singleInstance"
+            android:theme="@style/Cpp.Theme.Dialog.Material">
 
             <intent-filter>
-				<action android:name="android.intent.action.MAIN"/>
+                <action android:name="android.intent.action.MAIN" />
-				<category android:name="android.intent.category.LAUNCHER"/>
+                <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
 
         </activity>
 
-		<service android:exported="false" android:name=".onscreen.CalculatorOnscreenService">
+        <service
+            android:name=".onscreen.CalculatorOnscreenService"
+            android:exported="false">
             <intent-filter>
-				<action android:name="org.solovyev.android.calculator.onscreen.SHOW_WINDOW"/>
+                <action android:name="org.solovyev.android.calculator.onscreen.SHOW_WINDOW" />
-				<action android:name="org.solovyev.android.calculator.onscreen.SHOW_NOTIFICATION"/>
+                <action android:name="org.solovyev.android.calculator.onscreen.SHOW_NOTIFICATION" />
             </intent-filter>
         </service>
 
         <receiver android:name=".onscreen.CalculatorOnscreenBroadcastReceiver">
             <intent-filter>
-				<action android:name="android.intent.action.BOOT_COMPLETED"/>
+                <action android:name="android.intent.action.BOOT_COMPLETED" />
-				<action android:name="org.solovyev.android.calculator.onscreen.SHOW_WINDOW"/>
+                <action android:name="org.solovyev.android.calculator.onscreen.SHOW_WINDOW" />
-				<action android:name="org.solovyev.android.calculator.onscreen.SHOW_NOTIFICATION"/>
+                <action android:name="org.solovyev.android.calculator.onscreen.SHOW_NOTIFICATION" />
             </intent-filter>
         </receiver>
 
         <!-- WIDGET CONFIG -->
 
-		<receiver android:icon="@drawable/ic_launcher" android:label="@string/c_app_name" android:name=".widget.CalculatorWidget">
+        <receiver
+            android:name=".widget.CalculatorWidget"
+            android:icon="@drawable/ic_launcher"
+            android:label="@string/c_app_name">
 
             <intent-filter>
-				<action android:name="android.appwidget.action.APPWIDGET_UPDATE"/>
+                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
-				<action android:name="org.solovyev.android.calculator.INIT"/>
+                <action android:name="org.solovyev.android.calculator.INIT" />
-				<action android:name="org.solovyev.android.calculator.EDITOR_STATE_CHANGED"/>
+                <action android:name="org.solovyev.android.calculator.EDITOR_STATE_CHANGED" />
-				<action android:name="org.solovyev.android.calculator.DISPLAY_STATE_CHANGED"/>
+                <action android:name="org.solovyev.android.calculator.DISPLAY_STATE_CHANGED" />
-				<action android:name="org.solovyev.android.calculator.BUTTON_PRESSED"/>
+                <action android:name="org.solovyev.android.calculator.BUTTON_PRESSED" />
-				<action android:name="org.solovyev.android.calculator.THEME_CHANGED"/>
+                <action android:name="org.solovyev.android.calculator.THEME_CHANGED" />
             </intent-filter>
 
-			<meta-data android:name="android.appwidget.provider" android:resource="@xml/calculator_widget"/>
+            <meta-data
+                android:name="android.appwidget.provider"
+                android:resource="@xml/calculator_widget" />
         </receiver>
 
-		<receiver android:icon="@drawable/ic_launcher" android:label="@string/c_app_widget_3x3_name" android:name=".widget.CalculatorWidgetProvider">
+        <receiver
+            android:name=".widget.CalculatorWidgetProvider"
+            android:icon="@drawable/ic_launcher"
+            android:label="@string/c_app_widget_3x3_name">
 
             <intent-filter>
-				<action android:name="android.appwidget.action.APPWIDGET_UPDATE"/>
+                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
-				<action android:name="org.solovyev.android.calculator.INIT"/>
+                <action android:name="org.solovyev.android.calculator.INIT" />
-				<action android:name="org.solovyev.android.calculator.EDITOR_STATE_CHANGED"/>
+                <action android:name="org.solovyev.android.calculator.EDITOR_STATE_CHANGED" />
-				<action android:name="org.solovyev.android.calculator.DISPLAY_STATE_CHANGED"/>
+                <action android:name="org.solovyev.android.calculator.DISPLAY_STATE_CHANGED" />
-				<action android:name="org.solovyev.android.calculator.BUTTON_PRESSED"/>
+                <action android:name="org.solovyev.android.calculator.BUTTON_PRESSED" />
-				<action android:name="org.solovyev.android.calculator.THEME_CHANGED"/>
+                <action android:name="org.solovyev.android.calculator.THEME_CHANGED" />
             </intent-filter>
 
-			<meta-data android:name="android.appwidget.provider" android:resource="@xml/calculator_widget_info_3x3"/>
+            <meta-data
+                android:name="android.appwidget.provider"
+                android:resource="@xml/calculator_widget_info_3x3" />
         </receiver>
 
-		<receiver android:icon="@drawable/ic_launcher" android:label="@string/c_app_widget_3x4_name" android:name=".widget.CalculatorWidgetProvider3x4">
+        <receiver
+            android:name=".widget.CalculatorWidgetProvider3x4"
+            android:icon="@drawable/ic_launcher"
+            android:label="@string/c_app_widget_3x4_name">
 
             <intent-filter>
-				<action android:name="android.appwidget.action.APPWIDGET_UPDATE"/>
+                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
-				<action android:name="org.solovyev.android.calculator.INIT"/>
+                <action android:name="org.solovyev.android.calculator.INIT" />
-				<action android:name="org.solovyev.android.calculator.EDITOR_STATE_CHANGED"/>
+                <action android:name="org.solovyev.android.calculator.EDITOR_STATE_CHANGED" />
-				<action android:name="org.solovyev.android.calculator.DISPLAY_STATE_CHANGED"/>
+                <action android:name="org.solovyev.android.calculator.DISPLAY_STATE_CHANGED" />
-				<action android:name="org.solovyev.android.calculator.BUTTON_PRESSED"/>
+                <action android:name="org.solovyev.android.calculator.BUTTON_PRESSED" />
-				<action android:name="org.solovyev.android.calculator.THEME_CHANGED"/>
+                <action android:name="org.solovyev.android.calculator.THEME_CHANGED" />
             </intent-filter>
 
-			<meta-data android:name="android.appwidget.provider" android:resource="@xml/calculator_widget_info_3x4"/>
+            <meta-data
+                android:name="android.appwidget.provider"
+                android:resource="@xml/calculator_widget_info_3x4" />
         </receiver>
 
-		<receiver android:icon="@drawable/ic_launcher" android:label="@string/c_app_widget_4x4_name" android:name=".widget.CalculatorWidgetProvider4x4">
+        <receiver
+            android:name=".widget.CalculatorWidgetProvider4x4"
+            android:icon="@drawable/ic_launcher"
+            android:label="@string/c_app_widget_4x4_name">
 
             <intent-filter>
-				<action android:name="android.appwidget.action.APPWIDGET_UPDATE"/>
+                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
-				<action android:name="org.solovyev.android.calculator.INIT"/>
+                <action android:name="org.solovyev.android.calculator.INIT" />
-				<action android:name="org.solovyev.android.calculator.EDITOR_STATE_CHANGED"/>
+                <action android:name="org.solovyev.android.calculator.EDITOR_STATE_CHANGED" />
-				<action android:name="org.solovyev.android.calculator.DISPLAY_STATE_CHANGED"/>
+                <action android:name="org.solovyev.android.calculator.DISPLAY_STATE_CHANGED" />
-				<action android:name="org.solovyev.android.calculator.BUTTON_PRESSED"/>
+                <action android:name="org.solovyev.android.calculator.BUTTON_PRESSED" />
-				<action android:name="org.solovyev.android.calculator.THEME_CHANGED"/>
+                <action android:name="org.solovyev.android.calculator.THEME_CHANGED" />
             </intent-filter>
 
-			<meta-data android:name="android.appwidget.provider" android:resource="@xml/calculator_widget_info_4x4"/>
+            <meta-data
+                android:name="android.appwidget.provider"
+                android:resource="@xml/calculator_widget_info_4x4" />
         </receiver>
 
-		<receiver android:icon="@drawable/ic_launcher" android:label="@string/c_app_widget_4x5_name" android:name=".widget.CalculatorWidgetProvider4x5">
+        <receiver
+            android:name=".widget.CalculatorWidgetProvider4x5"
+            android:icon="@drawable/ic_launcher"
+            android:label="@string/c_app_widget_4x5_name">
 
             <intent-filter>
-				<action android:name="android.appwidget.action.APPWIDGET_UPDATE"/>
+                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
-				<action android:name="org.solovyev.android.calculator.INIT"/>
+                <action android:name="org.solovyev.android.calculator.INIT" />
-				<action android:name="org.solovyev.android.calculator.EDITOR_STATE_CHANGED"/>
+                <action android:name="org.solovyev.android.calculator.EDITOR_STATE_CHANGED" />
-				<action android:name="org.solovyev.android.calculator.DISPLAY_STATE_CHANGED"/>
+                <action android:name="org.solovyev.android.calculator.DISPLAY_STATE_CHANGED" />
-				<action android:name="org.solovyev.android.calculator.BUTTON_PRESSED"/>
+                <action android:name="org.solovyev.android.calculator.BUTTON_PRESSED" />
-				<action android:name="org.solovyev.android.calculator.THEME_CHANGED"/>
+                <action android:name="org.solovyev.android.calculator.THEME_CHANGED" />
             </intent-filter>
 
-			<meta-data android:name="android.appwidget.provider" android:resource="@xml/calculator_widget_info_4x5"/>
+            <meta-data
+                android:name="android.appwidget.provider"
+                android:resource="@xml/calculator_widget_info_4x5" />
         </receiver>
 
         <!-- ADMOB -->
@@ -191,20 +286,25 @@
 
         <!-- ACRA CONFIG -->
 
-		<activity android:excludeFromRecents="true" android:finishOnTaskLaunch="true" android:launchMode="singleInstance" android:name="org.acra.CrashReportDialog" android:theme="@android:style/Theme.Dialog"/>
+        <activity
+            android:name="org.acra.CrashReportDialog"
+            android:excludeFromRecents="true"
+            android:finishOnTaskLaunch="true"
+            android:launchMode="singleInstance"
+            android:theme="@android:style/Theme.Dialog" />
 
         <!-- Google Analytics -->
         <receiver
             android:name="com.google.android.gms.analytics.AnalyticsReceiver"
             android:enabled="true">
             <intent-filter>
-				<action android:name="com.google.android.gms.analytics.ANALYTICS_DISPATCH"/>
+                <action android:name="com.google.android.gms.analytics.ANALYTICS_DISPATCH" />
             </intent-filter>
         </receiver>
         <service
             android:name="com.google.android.gms.analytics.AnalyticsService"
             android:enabled="true"
-			android:exported="false"/>
+            android:exported="false" />
 
     </application>
 </manifest>

android-app/src/main/java/com/viewpagerindicator/CirclePageIndicator.java

@@ -32,6 +32,7 @@ import android.util.AttributeSet;
 import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewConfiguration;
+
 import org.solovyev.android.calculator.R;
 
 import static android.graphics.Paint.ANTI_ALIAS_FLAG;
@@ -44,11 +45,10 @@ import static android.widget.LinearLayout.VERTICAL;
  */
 public class CirclePageIndicator extends View implements PageIndicator {
     private static final int INVALID_POINTER = -1;
-
-    private float mRadius;
     private final Paint mPaintPageFill = new Paint(ANTI_ALIAS_FLAG);
     private final Paint mPaintStroke = new Paint(ANTI_ALIAS_FLAG);
     private final Paint mPaintFill = new Paint(ANTI_ALIAS_FLAG);
+    private float mRadius;
     private ViewPager mViewPager;
     private ViewPager.OnPageChangeListener mListener;
     private int mCurrentPage;
@@ -114,18 +114,12 @@ public class CirclePageIndicator extends View implements PageIndicator {
         mTouchSlop = ViewConfigurationCompat.getScaledPagingTouchSlop(configuration);
     }
 
-
-    public void setCentered(boolean centered) {
-        mCentered = centered;
-        invalidate();
-    }
-
     public boolean isCentered() {
         return mCentered;
     }
 
-    public void setPageColor(int pageColor) {
+    public void setCentered(boolean centered) {
-        mPaintPageFill.setColor(pageColor);
+        mCentered = centered;
         invalidate();
     }
 
@@ -133,8 +127,8 @@ public class CirclePageIndicator extends View implements PageIndicator {
         return mPaintPageFill.getColor();
     }
 
-    public void setFillColor(int fillColor) {
+    public void setPageColor(int pageColor) {
-        mPaintFill.setColor(fillColor);
+        mPaintPageFill.setColor(pageColor);
         invalidate();
     }
 
@@ -142,6 +136,15 @@ public class CirclePageIndicator extends View implements PageIndicator {
         return mPaintFill.getColor();
     }
 
+    public void setFillColor(int fillColor) {
+        mPaintFill.setColor(fillColor);
+        invalidate();
+    }
+
+    public int getOrientation() {
+        return mOrientation;
+    }
+
     public void setOrientation(int orientation) {
         switch (orientation) {
             case HORIZONTAL:
@@ -155,8 +158,8 @@ public class CirclePageIndicator extends View implements PageIndicator {
         }
     }
 
-    public int getOrientation() {
+    public int getStrokeColor() {
-        return mOrientation;
+        return mPaintStroke.getColor();
     }
 
     public void setStrokeColor(int strokeColor) {
@@ -164,8 +167,8 @@ public class CirclePageIndicator extends View implements PageIndicator {
         invalidate();
     }
 
-    public int getStrokeColor() {
+    public float getStrokeWidth() {
-        return mPaintStroke.getColor();
+        return mPaintStroke.getStrokeWidth();
     }
 
     public void setStrokeWidth(float strokeWidth) {
@@ -173,8 +176,8 @@ public class CirclePageIndicator extends View implements PageIndicator {
         invalidate();
     }
 
-    public float getStrokeWidth() {
+    public float getRadius() {
-        return mPaintStroke.getStrokeWidth();
+        return mRadius;
     }
 
     public void setRadius(float radius) {
@@ -182,8 +185,8 @@ public class CirclePageIndicator extends View implements PageIndicator {
         invalidate();
     }
 
-    public float getRadius() {
+    public boolean isSnap() {
-        return mRadius;
+        return mSnap;
     }
 
     public void setSnap(boolean snap) {
@@ -191,10 +194,6 @@ public class CirclePageIndicator extends View implements PageIndicator {
         invalidate();
     }
 
-    public boolean isSnap() {
-        return mSnap;
-    }
-
     @Override
     protected void onDraw(Canvas canvas) {
         super.onDraw(canvas);
@@ -454,8 +453,7 @@ public class CirclePageIndicator extends View implements PageIndicator {
     /**
      * Determines the width of this view
      *
-     * @param measureSpec
+     * @param measureSpec A measureSpec packed into an int
-     *            A measureSpec packed into an int
      * @return The width of the view, honoring constraints from measureSpec
      */
     private int measureLong(int measureSpec) {
@@ -469,7 +467,7 @@ public class CirclePageIndicator extends View implements PageIndicator {
         } else {
             //Calculate the width according the views count
             final int count = mViewPager.getAdapter().getCount();
-            result = (int)(getPaddingLeft() + getPaddingRight()
+            result = (int) (getPaddingLeft() + getPaddingRight()
                     + (count * 2 * mRadius) + (count - 1) * mRadius + 1);
             //Respect AT_MOST value if that was what is called for by measureSpec
             if (specMode == MeasureSpec.AT_MOST) {
@@ -482,8 +480,7 @@ public class CirclePageIndicator extends View implements PageIndicator {
     /**
      * Determines the height of this view
      *
-     * @param measureSpec
+     * @param measureSpec A measureSpec packed into an int
-     *            A measureSpec packed into an int
      * @return The height of the view, honoring constraints from measureSpec
      */
     private int measureShort(int measureSpec) {
@@ -496,7 +493,7 @@ public class CirclePageIndicator extends View implements PageIndicator {
             result = specSize;
         } else {
             //Measure the height
-            result = (int)(2 * mRadius + getPaddingTop() + getPaddingBottom() + 1);
+            result = (int) (2 * mRadius + getPaddingTop() + getPaddingBottom() + 1);
             //Respect AT_MOST value if that was what is called for by measureSpec
             if (specMode == MeasureSpec.AT_MOST) {
                 result = Math.min(result, specSize);
@@ -507,7 +504,7 @@ public class CirclePageIndicator extends View implements PageIndicator {
 
     @Override
     public void onRestoreInstanceState(Parcelable state) {
-        SavedState savedState = (SavedState)state;
+        SavedState savedState = (SavedState) state;
         super.onRestoreInstanceState(savedState.getSuperState());
         mCurrentPage = savedState.currentPage;
         mSnapPage = savedState.currentPage;
@@ -523,6 +520,18 @@ public class CirclePageIndicator extends View implements PageIndicator {
     }
 
     static class SavedState extends BaseSavedState {
+        @SuppressWarnings("UnusedDeclaration")
+        public static final Creator<SavedState> CREATOR = new Creator<SavedState>() {
+            @Override
+            public SavedState createFromParcel(Parcel in) {
+                return new SavedState(in);
+            }
+
+            @Override
+            public SavedState[] newArray(int size) {
+                return new SavedState[size];
+            }
+        };
         int currentPage;
 
         public SavedState(Parcelable superState) {
@@ -539,18 +548,5 @@ public class CirclePageIndicator extends View implements PageIndicator {
             super.writeToParcel(dest, flags);
             dest.writeInt(currentPage);
         }
-
-        @SuppressWarnings("UnusedDeclaration")
-        public static final Creator<SavedState> CREATOR = new Creator<SavedState>() {
-            @Override
-            public SavedState createFromParcel(Parcel in) {
-                return new SavedState(in);
-            }
-
-            @Override
-            public SavedState[] newArray(int size) {
-                return new SavedState[size];
-            }
-        };
     }
 }

android-app/src/main/java/com/viewpagerindicator/PageIndicator.java

@@ -41,7 +41,7 @@ public interface PageIndicator extends ViewPager.OnPageChangeListener {
 
     /**
      * <p>Set the current page of both the ViewPager and indicator.</p>
-     *
+     * <p/>
      * <p>This <strong>must</strong> be used if you need to set the page before
      * the views are drawn on screen (e.g., default start page).</p>
      *

android-app/src/main/java/org/solovyev/android/Check.java

@@ -36,6 +36,10 @@ public final class Check {
 
     private static final boolean junit = isJunit();
 
+    private Check() {
+        throw new AssertionError();
+    }
+
     private static boolean isJunit() {
         final StackTraceElement[] stackTrace = currentThread().getStackTrace();
         for (StackTraceElement element : stackTrace) {
@@ -46,10 +50,6 @@ public final class Check {
         return false;
     }
 
-	private Check() {
-		throw new AssertionError();
-	}
-
     public static void isMainThread() {
         if (!junit && Looper.getMainLooper() != Looper.myLooper()) {
             throw new AssertionException("Should be called on the main thread");

android-app/src/main/java/org/solovyev/android/calculator/ActivityUi.java

@@ -68,8 +68,32 @@ public class ActivityUi extends BaseUi {
         this.layoutId = layoutId;
     }
 
-	public void setLayoutId(int layoutId) {
+    public static boolean restartIfThemeChanged(@Nonnull Activity activity, @Nonnull Preferences.Gui.Theme oldTheme) {
-		this.layoutId = layoutId;
+        final Preferences.Gui.Theme newTheme = Preferences.Gui.theme.getPreference(App.getPreferences());
+        final int themeId = oldTheme.getThemeId(activity);
+        final int newThemeId = newTheme.getThemeId(activity);
+        if (themeId != newThemeId) {
+            Activities.restartActivity(activity);
+            return true;
+        }
+        return false;
+    }
+
+    public static boolean restartIfLanguageChanged(@Nonnull Activity activity, @Nonnull Language oldLanguage) {
+        final Language current = App.getLanguages().getCurrent();
+        if (!current.equals(oldLanguage)) {
+            Activities.restartActivity(activity);
+            return true;
+        }
+        return false;
+    }
+
+    public static void reportActivityStop(@Nonnull Activity activity) {
+        App.getGa().getAnalytics().reportActivityStop(activity);
+    }
+
+    public static void reportActivityStart(@Nonnull Activity activity) {
+        App.getGa().getAnalytics().reportActivityStart(activity);
     }
 
     public void onPreCreate(@Nonnull Activity activity) {
@@ -159,26 +183,6 @@ public class ActivityUi extends BaseUi {
         }
     }
 
-	public static boolean restartIfThemeChanged(@Nonnull Activity activity, @Nonnull Preferences.Gui.Theme oldTheme) {
-		final Preferences.Gui.Theme newTheme = Preferences.Gui.theme.getPreference(App.getPreferences());
-		final int themeId = oldTheme.getThemeId(activity);
-		final int newThemeId = newTheme.getThemeId(activity);
-		if (themeId != newThemeId) {
-			Activities.restartActivity(activity);
-			return true;
-		}
-		return false;
-	}
-
-	public static boolean restartIfLanguageChanged(@Nonnull Activity activity, @Nonnull Language oldLanguage) {
-		final Language current = App.getLanguages().getCurrent();
-		if (!current.equals(oldLanguage)) {
-			Activities.restartActivity(activity);
-			return true;
-		}
-		return false;
-	}
-
     public void onPause(@Nonnull Activity activity) {
     }
 
@@ -270,6 +274,10 @@ public class ActivityUi extends BaseUi {
         return layoutId;
     }
 
+    public void setLayoutId(int layoutId) {
+        this.layoutId = layoutId;
+    }
+
     @Nonnull
     public Preferences.Gui.Theme getTheme() {
         return theme;
@@ -354,15 +362,7 @@ public class ActivityUi extends BaseUi {
         reportActivityStop(activity);
     }
 
-	public static void reportActivityStop(@Nonnull Activity activity) {
-		App.getGa().getAnalytics().reportActivityStop(activity);
-	}
-
     public void onStart(@Nonnull Activity activity) {
         reportActivityStart(activity);
     }
-
-	public static void reportActivityStart(@Nonnull Activity activity) {
-		App.getGa().getAnalytics().reportActivityStart(activity);
-	}
 }

android-app/src/main/java/org/solovyev/android/calculator/AdView.java

@@ -43,7 +43,7 @@ public class AdView extends FrameLayout {
             admobView.setAdListener(null);
             admobView = null;
         }
-		if(admobListener != null) {
+        if (admobListener != null) {
             admobListener.destroy();
             admobListener = null;
         }
@@ -86,7 +86,7 @@ public class AdView extends FrameLayout {
     }
 
     public void hide() {
-		if(admobView == null) {
+        if (admobView == null) {
             return;
         }
 

android-app/src/main/java/org/solovyev/android/calculator/AndroidCalculator.java

@@ -80,13 +80,13 @@ public class AndroidCalculator implements Calculator, CalculatorEventListener, S
     }
 
     @Override
-	public void setCalculateOnFly(boolean calculateOnFly) {
+    public boolean isCalculateOnFly() {
-		calculator.setCalculateOnFly(calculateOnFly);
+        return calculator.isCalculateOnFly();
     }
 
     @Override
-	public boolean isCalculateOnFly() {
+    public void setCalculateOnFly(boolean calculateOnFly) {
-		return calculator.isCalculateOnFly();
+        calculator.setCalculateOnFly(calculateOnFly);
     }
 
     @Override
@@ -157,17 +157,17 @@ public class AndroidCalculator implements Calculator, CalculatorEventListener, S
         calculator.doHistoryAction(historyAction);
     }
 
-	@Override
-	public void setCurrentHistoryState(@Nonnull CalculatorHistoryState editorHistoryState) {
-		calculator.setCurrentHistoryState(editorHistoryState);
-	}
-
     @Override
     @Nonnull
     public CalculatorHistoryState getCurrentHistoryState() {
         return calculator.getCurrentHistoryState();
     }
 
+    @Override
+    public void setCurrentHistoryState(@Nonnull CalculatorHistoryState editorHistoryState) {
+        calculator.setCurrentHistoryState(editorHistoryState);
+    }
+
     @Override
     public void evaluate() {
         calculator.evaluate();

android-app/src/main/java/org/solovyev/android/calculator/AndroidCalculatorClipboard.java

@@ -53,13 +53,13 @@ public class AndroidCalculatorClipboard implements CalculatorClipboard {
     }
 
     @Override
-	public void setText(@Nonnull String text) {
+    public void setText(@Nonnull CharSequence text) {
         final ClipboardManager clipboard = (ClipboardManager) context.getSystemService(Context.CLIPBOARD_SERVICE);
         clipboard.setText(text);
     }
 
     @Override
-	public void setText(@Nonnull CharSequence text) {
+    public void setText(@Nonnull String text) {
         final ClipboardManager clipboard = (ClipboardManager) context.getSystemService(Context.CLIPBOARD_SERVICE);
         clipboard.setText(text);
     }

android-app/src/main/java/org/solovyev/android/calculator/AndroidCalculatorDisplayView.java

@@ -64,16 +64,12 @@ public class AndroidCalculatorDisplayView extends AutoResizeTextView implements
 	*
 	**********************************************************************
 	*/
-
-	@Nonnull
-	private volatile CalculatorDisplayViewState state = CalculatorDisplayViewStateImpl.newDefaultInstance();
-
     @Nonnull
     private final Object lock = new Object();
-
     @Nonnull
     private final Handler uiHandler = new Handler();
-
+    @Nonnull
+    private volatile CalculatorDisplayViewState state = CalculatorDisplayViewStateImpl.newDefaultInstance();
     private volatile boolean initialized = false;
 
 	/*
@@ -107,6 +103,18 @@ public class AndroidCalculatorDisplayView extends AutoResizeTextView implements
 	**********************************************************************
 	*/
 
+    private Preferences.Gui.TextColor getTextColor() {
+        final Context context = getContext();
+        return App.getThemeIn(context).getTextColor(context);
+    }
+
+    @Nonnull
+    @Override
+    public CalculatorDisplayViewState getState() {
+        synchronized (lock) {
+            return this.state;
+        }
+    }
 
     @Override
     public void setState(@Nonnull final CalculatorDisplayViewState state) {
@@ -140,19 +148,6 @@ public class AndroidCalculatorDisplayView extends AutoResizeTextView implements
         });
     }
 
-	private Preferences.Gui.TextColor getTextColor() {
-		final Context context = getContext();
-		return App.getThemeIn(context).getTextColor(context);
-	}
-
-	@Nonnull
-	@Override
-	public CalculatorDisplayViewState getState() {
-		synchronized (lock) {
-			return this.state;
-		}
-	}
-
     @Nullable
     private CharSequence prepareText(@Nullable String text, boolean valid) {
         CharSequence result;

android-app/src/main/java/org/solovyev/android/calculator/AndroidCalculatorEditorView.java

@@ -43,17 +43,14 @@ import javax.annotation.Nonnull;
  */
 public class AndroidCalculatorEditorView extends EditText implements CalculatorEditorView {
 
+    @Nonnull
+    private final Handler uiHandler = new Handler();
     private volatile boolean initialized = false;
-
     @SuppressWarnings("UnusedDeclaration")
     @Nonnull
     private volatile CalculatorEditorViewState viewState = CalculatorEditorViewStateImpl.newDefaultInstance();
-
     private volatile boolean viewStateChange = false;
 
-	@Nonnull
-	private final Handler uiHandler = new Handler();
-
     public AndroidCalculatorEditorView(Context context) {
         super(context);
     }

android-app/src/main/java/org/solovyev/android/calculator/AndroidCalculatorKeyboard.java

@@ -22,13 +22,8 @@
 
 package org.solovyev.android.calculator;
 
-import android.app.Activity;
 import android.app.Application;
 import android.content.Context;
-import android.content.SharedPreferences;
-import android.os.Vibrator;
-import android.preference.PreferenceManager;
-import org.solovyev.android.view.VibratorContainer;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;

android-app/src/main/java/org/solovyev/android/calculator/AndroidCalculatorNotifier.java

@@ -25,14 +25,16 @@ package org.solovyev.android.calculator;
 import android.app.Application;
 import android.os.Handler;
 import android.widget.Toast;
+
 import org.solovyev.android.Threads;
 import org.solovyev.android.msg.AndroidMessage;
 import org.solovyev.common.msg.Message;
 import org.solovyev.common.msg.MessageType;
 
+import java.util.List;
+
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
-import java.util.List;
 
 /**
  * User: serso

android-app/src/main/java/org/solovyev/android/calculator/AndroidCalculatorPreferenceService.java

@@ -25,10 +25,6 @@ package org.solovyev.android.calculator;
 import android.app.Application;
 import android.content.SharedPreferences;
 import android.preference.PreferenceManager;
-import jscl.AngleUnit;
-import jscl.NumeralBase;
-
-import javax.annotation.Nonnull;
 
 import org.solovyev.android.calculator.model.AndroidCalculatorEngine;
 import org.solovyev.android.msg.AndroidMessage;
@@ -37,6 +33,11 @@ import org.solovyev.common.msg.MessageType;
 import java.util.ArrayList;
 import java.util.List;
 
+import javax.annotation.Nonnull;
+
+import jscl.AngleUnit;
+import jscl.NumeralBase;
+
 /**
  * User: serso
  * Date: 11/17/12

android-app/src/main/java/org/solovyev/android/calculator/AndroidFunctionCategory.java

@@ -44,10 +44,6 @@ public enum AndroidFunctionCategory {
         this.captionId = captionId;
     }
 
-	public int getCaptionId() {
-		return captionId;
-	}
-
     @Nullable
     public static AndroidFunctionCategory valueOf(@Nonnull FunctionCategory functionCategory) {
         for (AndroidFunctionCategory androidFunctionCategory : values()) {
@@ -58,4 +54,8 @@ public enum AndroidFunctionCategory {
 
         return null;
     }
+
+    public int getCaptionId() {
+        return captionId;
+    }
 }

android-app/src/main/java/org/solovyev/android/calculator/AndroidNumeralBase.java

@@ -23,18 +23,19 @@
 package org.solovyev.android.calculator;
 
 import android.app.Activity;
-import jscl.NumeralBase;
 
-import javax.annotation.Nonnull;
-
-import org.solovyev.android.calculator.units.CalculatorNumeralBase;
 import org.solovyev.android.calculator.drag.DirectionDragButton;
 import org.solovyev.android.calculator.drag.DragDirection;
+import org.solovyev.android.calculator.units.CalculatorNumeralBase;
 
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
+import javax.annotation.Nonnull;
+
+import jscl.NumeralBase;
+
 /**
  * User: serso
  * Date: 4/21/12
@@ -98,6 +99,17 @@ public enum AndroidNumeralBase {
         this.calculatorNumeralBase = calculatorNumeralBase;
     }
 
+    @Nonnull
+    public static AndroidNumeralBase valueOf(@Nonnull NumeralBase nb) {
+        for (AndroidNumeralBase androidNumeralBase : values()) {
+            if (androidNumeralBase.calculatorNumeralBase.getNumeralBase() == nb) {
+                return androidNumeralBase;
+            }
+        }
+
+        throw new IllegalArgumentException(nb + " is not supported numeral base!");
+    }
+
     @Nonnull
     public abstract List<Integer> getButtonIds();
 
@@ -119,15 +131,4 @@ public enum AndroidNumeralBase {
     public NumeralBase getNumeralBase() {
         return calculatorNumeralBase.getNumeralBase();
     }
-
-	@Nonnull
-	public static AndroidNumeralBase valueOf(@Nonnull NumeralBase nb) {
-		for (AndroidNumeralBase androidNumeralBase : values()) {
-			if (androidNumeralBase.calculatorNumeralBase.getNumeralBase() == nb) {
-				return androidNumeralBase;
-			}
-		}
-
-		throw new IllegalArgumentException(nb + " is not supported numeral base!");
-	}
 }

android-app/src/main/java/org/solovyev/android/calculator/AndroidOperatorCategory.java

@@ -43,10 +43,6 @@ public enum AndroidOperatorCategory {
         this.captionId = captionId;
     }
 
-	public int getCaptionId() {
-		return captionId;
-	}
-
     @Nullable
     public static AndroidOperatorCategory valueOf(@Nonnull OperatorCategory operatorCategory) {
         for (AndroidOperatorCategory androidOperatorCategory : values()) {
@@ -57,4 +53,8 @@ public enum AndroidOperatorCategory {
 
         return null;
     }
+
+    public int getCaptionId() {
+        return captionId;
+    }
 }

android-app/src/main/java/org/solovyev/android/calculator/AndroidVarCategory.java

@@ -41,10 +41,6 @@ public enum AndroidVarCategory {
         this.captionId = captionId;
     }
 
-	public int getCaptionId() {
-		return captionId;
-	}
-
     @Nullable
     public static AndroidVarCategory valueOf(@Nonnull VarCategory varCategory) {
         for (AndroidVarCategory androidVarCategory : values()) {
@@ -55,4 +51,8 @@ public enum AndroidVarCategory {
 
         return null;
     }
+
+    public int getCaptionId() {
+        return captionId;
+    }
 }

android-app/src/main/java/org/solovyev/android/calculator/App.java

@@ -86,47 +86,33 @@ import javax.annotation.Nullable;
 public final class App {
     @Nonnull
     private static final List<Class<? extends BaseCalculatorWidgetProvider>> OLD_WIDGETS = Arrays.asList(CalculatorWidgetProvider.class, CalculatorWidgetProvider3x4.class, CalculatorWidgetProvider4x4.class, CalculatorWidgetProvider4x5.class);
-
-	@Nonnull
-	private static volatile Application application;
-
-	@Nonnull
-	private static volatile DelayedExecutor uiThreadExecutor;
-
-	@Nonnull
-	private static volatile JEventListeners<JEventListener<? extends JEvent>, JEvent> eventBus;
-
-	private static volatile boolean initialized;
-
-	@Nonnull
-	private static CalculatorBroadcaster broadcaster;
-
-	@Nonnull
-	private static SharedPreferences preferences;
-
-	@Nonnull
-	private static volatile Ga ga;
-
-	@Nonnull
-	private static volatile Billing billing;
-
     @Nonnull
     private static final Products products = Products.create().add(ProductTypes.IN_APP, Arrays.asList("ad_free"));
-
-	@Nullable
-	private static Boolean lg = null;
-
-	@Nonnull
-	private static volatile Vibrator vibrator;
-
-	@Nonnull
-	private static volatile ScreenMetrics screenMetrics;
-
-	@Nonnull
-	private static volatile Plotter plotter;
-
     @Nonnull
     private static final Languages languages = new Languages();
+    @Nonnull
+    private static volatile Application application;
+    @Nonnull
+    private static volatile DelayedExecutor uiThreadExecutor;
+    @Nonnull
+    private static volatile JEventListeners<JEventListener<? extends JEvent>, JEvent> eventBus;
+    private static volatile boolean initialized;
+    @Nonnull
+    private static CalculatorBroadcaster broadcaster;
+    @Nonnull
+    private static SharedPreferences preferences;
+    @Nonnull
+    private static volatile Ga ga;
+    @Nonnull
+    private static volatile Billing billing;
+    @Nullable
+    private static Boolean lg = null;
+    @Nonnull
+    private static volatile Vibrator vibrator;
+    @Nonnull
+    private static volatile ScreenMetrics screenMetrics;
+    @Nonnull
+    private static volatile Plotter plotter;
 
     private App() {
         throw new AssertionError();

android-app/src/main/java/org/solovyev/android/calculator/BaseUi.java

@@ -32,8 +32,13 @@ import android.util.Log;
 import android.view.MotionEvent;
 import android.view.View;
 import android.widget.TextView;
+
 import org.solovyev.android.Views;
-import org.solovyev.android.calculator.drag.*;
+import org.solovyev.android.calculator.drag.DirectionDragButton;
+import org.solovyev.android.calculator.drag.DragButton;
+import org.solovyev.android.calculator.drag.DragDirection;
+import org.solovyev.android.calculator.drag.DragListener;
+import org.solovyev.android.calculator.drag.SimpleDragListener;
 import org.solovyev.android.calculator.history.CalculatorHistoryState;
 import org.solovyev.android.calculator.history.HistoryDragProcessor;
 import org.solovyev.android.calculator.view.AngleUnitsButton;
@@ -42,11 +47,12 @@ import org.solovyev.android.calculator.view.NumeralBasesButton;
 import org.solovyev.android.calculator.view.ViewsCache;
 import org.solovyev.common.math.Point2d;
 
-import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
 import java.util.ArrayList;
 import java.util.List;
 
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
 import static org.solovyev.android.calculator.Preferences.Gui.Layout.simple;
 import static org.solovyev.android.calculator.Preferences.Gui.Layout.simple_mobile;
 import static org.solovyev.android.calculator.model.AndroidCalculatorEngine.Preferences.angleUnit;
@@ -79,6 +85,38 @@ public abstract class BaseUi implements SharedPreferences.OnSharedPreferenceChan
         this.logTag = logTag;
     }
 
+    @Nonnull
+    private static List<Integer> getViewIds() {
+        if (viewIds.isEmpty()) {
+            viewIds.add(R.id.wizard_dragbutton);
+            viewIds.add(R.id.cpp_button_vars);
+            viewIds.add(R.id.cpp_button_round_brackets);
+            viewIds.add(R.id.cpp_button_right);
+            viewIds.add(R.id.cpp_button_plus);
+            viewIds.add(R.id.cpp_button_operators);
+            viewIds.add(R.id.cpp_button_multiplication);
+            viewIds.add(R.id.cpp_button_subtraction);
+            viewIds.add(R.id.cpp_button_left);
+            viewIds.add(R.id.cpp_button_history);
+            viewIds.add(R.id.cpp_button_functions);
+            viewIds.add(R.id.cpp_button_equals);
+            viewIds.add(R.id.cpp_button_period);
+            viewIds.add(R.id.cpp_button_division);
+            viewIds.add(R.id.cpp_button_9);
+            viewIds.add(R.id.cpp_button_8);
+            viewIds.add(R.id.cpp_button_7);
+            viewIds.add(R.id.cpp_button_6);
+            viewIds.add(R.id.cpp_button_5);
+            viewIds.add(R.id.cpp_button_4);
+            viewIds.add(R.id.cpp_button_3);
+            viewIds.add(R.id.cpp_button_2);
+            viewIds.add(R.id.cpp_button_1);
+            viewIds.add(R.id.cpp_button_0);
+            viewIds.add(R.id.cpp_button_clear);
+        }
+        return viewIds;
+    }
+
     protected void onCreate(@Nonnull Activity activity) {
         final SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(activity);
 
@@ -246,38 +284,6 @@ public abstract class BaseUi implements SharedPreferences.OnSharedPreferenceChan
         return Locator.getInstance().getCalculator();
     }
 
-	@Nonnull
-	private static List<Integer> getViewIds() {
-		if (viewIds.isEmpty()) {
-			viewIds.add(R.id.wizard_dragbutton);
-			viewIds.add(R.id.cpp_button_vars);
-			viewIds.add(R.id.cpp_button_round_brackets);
-			viewIds.add(R.id.cpp_button_right);
-			viewIds.add(R.id.cpp_button_plus);
-			viewIds.add(R.id.cpp_button_operators);
-			viewIds.add(R.id.cpp_button_multiplication);
-			viewIds.add(R.id.cpp_button_subtraction);
-			viewIds.add(R.id.cpp_button_left);
-			viewIds.add(R.id.cpp_button_history);
-			viewIds.add(R.id.cpp_button_functions);
-			viewIds.add(R.id.cpp_button_equals);
-			viewIds.add(R.id.cpp_button_period);
-			viewIds.add(R.id.cpp_button_division);
-			viewIds.add(R.id.cpp_button_9);
-			viewIds.add(R.id.cpp_button_8);
-			viewIds.add(R.id.cpp_button_7);
-			viewIds.add(R.id.cpp_button_6);
-			viewIds.add(R.id.cpp_button_5);
-			viewIds.add(R.id.cpp_button_4);
-			viewIds.add(R.id.cpp_button_3);
-			viewIds.add(R.id.cpp_button_2);
-			viewIds.add(R.id.cpp_button_1);
-			viewIds.add(R.id.cpp_button_0);
-			viewIds.add(R.id.cpp_button_clear);
-		}
-		return viewIds;
-	}
-
     @Nonnull
     private CalculatorKeyboard getKeyboard() {
         return Locator.getInstance().getKeyboard();

android-app/src/main/java/org/solovyev/android/calculator/ButtonOnClickListener.java

@@ -3,6 +3,7 @@ package org.solovyev.android.calculator;
 import android.support.annotation.IdRes;
 import android.view.View;
 import android.widget.Button;
+
 import org.solovyev.android.calculator.view.ViewsCache;
 
 import javax.annotation.Nonnull;

android-app/src/main/java/org/solovyev/android/calculator/CalculatorActivity.java

@@ -32,8 +32,13 @@ import android.os.Bundle;
 import android.preference.PreferenceManager;
 import android.support.v7.app.ActionBar;
 import android.text.method.LinkMovementMethod;
-import android.view.*;
+import android.view.KeyEvent;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewConfiguration;
+import android.view.Window;
 import android.widget.TextView;
+
 import org.solovyev.android.Activities;
 import org.solovyev.android.Android;
 import org.solovyev.android.Threads;
@@ -54,7 +59,9 @@ import static android.os.Build.VERSION_CODES.ICE_CREAM_SANDWICH;
 import static android.view.WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;
 import static org.solovyev.android.calculator.Preferences.Gui.preventScreenFromFading;
 import static org.solovyev.android.calculator.release.ReleaseNotes.hasReleaseNotes;
-import static org.solovyev.android.wizard.WizardUi.*;
+import static org.solovyev.android.wizard.WizardUi.continueWizard;
+import static org.solovyev.android.wizard.WizardUi.createLaunchIntent;
+import static org.solovyev.android.wizard.WizardUi.startWizard;
 
 public class CalculatorActivity extends BaseActivity implements SharedPreferences.OnSharedPreferenceChangeListener, CalculatorEventListener {
 
@@ -67,70 +74,6 @@ public class CalculatorActivity extends BaseActivity implements SharedPreference
         super(0, TAG);
     }
 
-	/**
-	 * Called when the activity is first created.
-	 */
-	@Override
-	public void onCreate(@Nullable Bundle savedInstanceState) {
-		final SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
-		final Preferences.Gui.Layout layout = Preferences.Gui.layout.getPreferenceNoError(preferences);
-		ui.setLayoutId(layout.getLayoutId());
-
-		super.onCreate(savedInstanceState);
-
-		if (isMultiPane()) {
-			ui.addTab(this, CalculatorFragmentType.history, null, R.id.main_second_pane);
-			ui.addTab(this, CalculatorFragmentType.saved_history, null, R.id.main_second_pane);
-			ui.addTab(this, CalculatorFragmentType.variables, null, R.id.main_second_pane);
-			ui.addTab(this, CalculatorFragmentType.functions, null, R.id.main_second_pane);
-			ui.addTab(this, CalculatorFragmentType.operators, null, R.id.main_second_pane);
-			ui.addTab(this, CalculatorPlotActivity.getPlotterFragmentType(), null, R.id.main_second_pane);
-		} else {
-			final ActionBar actionBar = getSupportActionBar();
-			if (Build.VERSION.SDK_INT <= GINGERBREAD_MR1 || (Build.VERSION.SDK_INT >= ICE_CREAM_SANDWICH && hasPermanentMenuKey())) {
-				actionBar.hide();
-			} else {
-				actionBar.setDisplayShowTitleEnabled(false);
-				actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
-			}
-		}
-
-		FragmentUtils.createFragment(this, CalculatorEditorFragment.class, R.id.editorContainer, "editor");
-		FragmentUtils.createFragment(this, CalculatorDisplayFragment.class, R.id.displayContainer, "display");
-		FragmentUtils.createFragment(this, CalculatorKeyboardFragment.class, R.id.keyboardContainer, "keyboard");
-
-		this.useBackAsPrev = Preferences.Gui.usePrevAsBack.getPreference(preferences);
-		if (savedInstanceState == null) {
-			firstTimeInit(preferences, this);
-		}
-
-		toggleOrientationChange(preferences);
-
-		preferences.registerOnSharedPreferenceChangeListener(this);
-
-		Locator.getInstance().getPreferenceService().checkPreferredPreferences(false);
-
-		if (CalculatorApplication.isMonkeyRunner(this)) {
-			Locator.getInstance().getKeyboard().buttonPressed("123");
-			Locator.getInstance().getKeyboard().buttonPressed("+");
-			Locator.getInstance().getKeyboard().buttonPressed("321");
-		}
-	}
-
-	@TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
-	private boolean hasPermanentMenuKey() {
-		return ViewConfiguration.get(this).hasPermanentMenuKey();
-	}
-
-	private boolean isMultiPane() {
-		return findViewById(R.id.main_second_pane) != null;
-	}
-
-	@Nonnull
-	private AndroidCalculator getCalculator() {
-		return ((AndroidCalculator) Locator.getInstance().getCalculator());
-	}
-
     private static void firstTimeInit(@Nonnull SharedPreferences preferences, @Nonnull Context context) {
         final Integer appOpenedCounter = Preferences.appOpenedCounter.getPreference(preferences);
         if (appOpenedCounter != null) {
@@ -200,6 +143,70 @@ public class CalculatorActivity extends BaseActivity implements SharedPreference
         return result;
     }
 
+    /**
+     * Called when the activity is first created.
+     */
+    @Override
+    public void onCreate(@Nullable Bundle savedInstanceState) {
+        final SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
+        final Preferences.Gui.Layout layout = Preferences.Gui.layout.getPreferenceNoError(preferences);
+        ui.setLayoutId(layout.getLayoutId());
+
+        super.onCreate(savedInstanceState);
+
+        if (isMultiPane()) {
+            ui.addTab(this, CalculatorFragmentType.history, null, R.id.main_second_pane);
+            ui.addTab(this, CalculatorFragmentType.saved_history, null, R.id.main_second_pane);
+            ui.addTab(this, CalculatorFragmentType.variables, null, R.id.main_second_pane);
+            ui.addTab(this, CalculatorFragmentType.functions, null, R.id.main_second_pane);
+            ui.addTab(this, CalculatorFragmentType.operators, null, R.id.main_second_pane);
+            ui.addTab(this, CalculatorPlotActivity.getPlotterFragmentType(), null, R.id.main_second_pane);
+        } else {
+            final ActionBar actionBar = getSupportActionBar();
+            if (Build.VERSION.SDK_INT <= GINGERBREAD_MR1 || (Build.VERSION.SDK_INT >= ICE_CREAM_SANDWICH && hasPermanentMenuKey())) {
+                actionBar.hide();
+            } else {
+                actionBar.setDisplayShowTitleEnabled(false);
+                actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
+            }
+        }
+
+        FragmentUtils.createFragment(this, CalculatorEditorFragment.class, R.id.editorContainer, "editor");
+        FragmentUtils.createFragment(this, CalculatorDisplayFragment.class, R.id.displayContainer, "display");
+        FragmentUtils.createFragment(this, CalculatorKeyboardFragment.class, R.id.keyboardContainer, "keyboard");
+
+        this.useBackAsPrev = Preferences.Gui.usePrevAsBack.getPreference(preferences);
+        if (savedInstanceState == null) {
+            firstTimeInit(preferences, this);
+        }
+
+        toggleOrientationChange(preferences);
+
+        preferences.registerOnSharedPreferenceChangeListener(this);
+
+        Locator.getInstance().getPreferenceService().checkPreferredPreferences(false);
+
+        if (CalculatorApplication.isMonkeyRunner(this)) {
+            Locator.getInstance().getKeyboard().buttonPressed("123");
+            Locator.getInstance().getKeyboard().buttonPressed("+");
+            Locator.getInstance().getKeyboard().buttonPressed("321");
+        }
+    }
+
+    @TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
+    private boolean hasPermanentMenuKey() {
+        return ViewConfiguration.get(this).hasPermanentMenuKey();
+    }
+
+    private boolean isMultiPane() {
+        return findViewById(R.id.main_second_pane) != null;
+    }
+
+    @Nonnull
+    private AndroidCalculator getCalculator() {
+        return ((AndroidCalculator) Locator.getInstance().getCalculator());
+    }
+
     @Override
     public boolean onKeyDown(int keyCode, KeyEvent event) {
         if (keyCode == KeyEvent.KEYCODE_BACK) {

android-app/src/main/java/org/solovyev/android/calculator/CalculatorActivityLauncher.java

@@ -29,16 +29,20 @@ import android.content.Intent;
 import android.content.SharedPreferences;
 import android.net.Uri;
 import android.preference.PreferenceManager;
+import android.support.v7.app.ActionBarActivity;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.widget.TextView;
-import android.support.v7.app.ActionBarActivity;
+
-import jscl.math.Generic;
 import org.solovyev.android.Android;
 import org.solovyev.android.calculator.about.CalculatorAboutActivity;
 import org.solovyev.android.calculator.function.FunctionEditDialogFragment;
 import org.solovyev.android.calculator.history.CalculatorHistoryActivity;
-import org.solovyev.android.calculator.math.edit.*;
+import org.solovyev.android.calculator.math.edit.CalculatorFunctionsActivity;
+import org.solovyev.android.calculator.math.edit.CalculatorOperatorsActivity;
+import org.solovyev.android.calculator.math.edit.CalculatorVarsActivity;
+import org.solovyev.android.calculator.math.edit.CalculatorVarsFragment;
+import org.solovyev.android.calculator.math.edit.VarEditDialogFragment;
 import org.solovyev.android.calculator.matrix.CalculatorMatrixActivity;
 import org.solovyev.android.calculator.plot.CalculatorPlotActivity;
 import org.solovyev.android.calculator.plot.CalculatorPlotter;
@@ -47,9 +51,12 @@ import org.solovyev.common.msg.Message;
 import org.solovyev.common.msg.MessageType;
 import org.solovyev.common.text.Strings;
 
+import java.util.List;
+
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
-import java.util.List;
+
+import jscl.math.Generic;
 
 /**
  * User: serso
@@ -213,6 +220,19 @@ public final class CalculatorActivityLauncher implements CalculatorEventListener
         }
     }
 
+    public static void showEvaluationError(@Nonnull Context context, @Nonnull final String errorMessage) {
+        final LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
+
+        final View errorMessageView = layoutInflater.inflate(R.layout.display_error_message, null);
+        ((TextView) errorMessageView.findViewById(R.id.error_message_text_view)).setText(errorMessage);
+
+        final AlertDialog.Builder builder = new AlertDialog.Builder(context)
+                .setPositiveButton(R.string.c_cancel, null)
+                .setView(errorMessageView);
+
+        builder.create().show();
+    }
+
     @Override
     public void onCalculatorEvent(@Nonnull CalculatorEventData calculatorEventData, @Nonnull CalculatorEventType calculatorEventType, @Nullable Object data) {
         final Context context;
@@ -276,17 +296,4 @@ public final class CalculatorActivityLauncher implements CalculatorEventListener
 
         }
     }
-
-	public static void showEvaluationError(@Nonnull Context context, @Nonnull final String errorMessage) {
-		final LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
-
-		final View errorMessageView = layoutInflater.inflate(R.layout.display_error_message, null);
-		((TextView) errorMessageView.findViewById(R.id.error_message_text_view)).setText(errorMessage);
-
-		final AlertDialog.Builder builder = new AlertDialog.Builder(context)
-				.setPositiveButton(R.string.c_cancel, null)
-				.setView(errorMessageView);
-
-		builder.create().show();
-	}
 }

android-app/src/main/java/org/solovyev/android/calculator/CalculatorApplication.java

@@ -58,8 +58,8 @@ import javax.annotation.Nonnull;
         formUri = "https://serso.cloudant.com/acra-cpp/_design/acra-storage/_update/report",
         reportType = org.acra.sender.HttpSender.Type.JSON,
         httpMethod = org.acra.sender.HttpSender.Method.PUT,
-		formUriBasicAuthLogin="timbeenterumisideffecird",
+        formUriBasicAuthLogin = "timbeenterumisideffecird",
-		formUriBasicAuthPassword="ECL65PO2TH5quIFNAK4hQ5Ng",
+        formUriBasicAuthPassword = "ECL65PO2TH5quIFNAK4hQ5Ng",
         mode = ReportingInteractionMode.TOAST,
         resToastText = R.string.crashed)
 public class CalculatorApplication extends android.app.Application implements SharedPreferences.OnSharedPreferenceChangeListener {
@@ -72,15 +72,12 @@ public class CalculatorApplication extends android.app.Application implements Sh
 	**********************************************************************
 	*/
 
-	@Nonnull
-	static final String MAIL = "se.solovyev@gmail.com";
-
-	private static final String TAG = "C++";
-
     public static final String AD_FREE_PRODUCT_ID = "ad_free";
     public static final String AD_FREE_P_KEY = "org.solovyev.android.calculator_ad_free";
     public static final String ADMOB = "ca-app-pub-2228934497384784/2916398892";
-
+    @Nonnull
+    static final String MAIL = "se.solovyev@gmail.com";
+    private static final String TAG = "C++";
     @Nonnull
     private static CalculatorApplication instance;
 
@@ -91,13 +88,10 @@ public class CalculatorApplication extends android.app.Application implements Sh
 	*
 	**********************************************************************
 	*/
-
-	@Nonnull
-	private final List<CalculatorEventListener> listeners = new ArrayList<CalculatorEventListener>();
-
     @Nonnull
     protected final Handler uiHandler = new Handler();
-
+    @Nonnull
+    private final List<CalculatorEventListener> listeners = new ArrayList<CalculatorEventListener>();
     @Nonnull
     private final Wizards wizards = new CalculatorWizards(this);
 
@@ -123,6 +117,21 @@ public class CalculatorApplication extends android.app.Application implements Sh
 	**********************************************************************
 	*/
 
+    @Nonnull
+    public static CalculatorApplication getInstance() {
+        return instance;
+    }
+
+    @Nonnull
+    public static SharedPreferences getPreferences() {
+        return PreferenceManager.getDefaultSharedPreferences(getInstance());
+    }
+
+    public static boolean isMonkeyRunner(@Nonnull Context context) {
+        // NOTE: this code is only for monkeyrunner
+        return context.checkCallingOrSelfPermission(android.Manifest.permission.DISABLE_KEYGUARD) == PackageManager.PERMISSION_GRANTED;
+    }
+
     @Override
     public void onCreate() {
         if (!BuildConfig.DEBUG) {
@@ -231,6 +240,14 @@ public class CalculatorApplication extends android.app.Application implements Sh
         return new FragmentUi(layoutId, titleResId, listenersOnCreate);
     }
 
+	/*
+	**********************************************************************
+	*
+	*                           STATIC
+	*
+	**********************************************************************
+	*/
+
     @Nonnull
     public Handler getUiHandler() {
         return uiHandler;
@@ -249,29 +266,6 @@ public class CalculatorApplication extends android.app.Application implements Sh
         return typeFace;
     }
 
-	/*
-	**********************************************************************
-	*
-	*                           STATIC
-	*
-	**********************************************************************
-	*/
-
-	@Nonnull
-	public static CalculatorApplication getInstance() {
-		return instance;
-	}
-
-	@Nonnull
-	public static SharedPreferences getPreferences() {
-		return PreferenceManager.getDefaultSharedPreferences(getInstance());
-	}
-
-	public static boolean isMonkeyRunner(@Nonnull Context context) {
-		// NOTE: this code is only for monkeyrunner
-		return context.checkCallingOrSelfPermission(android.Manifest.permission.DISABLE_KEYGUARD) == PackageManager.PERMISSION_GRANTED;
-	}
-
     @Override
     public void onSharedPreferenceChanged(SharedPreferences prefs, String key) {
         if (Preferences.Onscreen.showAppIcon.getKey().equals(key)) {

android-app/src/main/java/org/solovyev/android/calculator/CalculatorButton.java

@@ -22,15 +22,19 @@
 
 package org.solovyev.android.calculator;
 
-import android.content.Context;
 import android.util.SparseArray;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
-import java.util.HashMap;
-import java.util.Map;
 
-import static org.solovyev.android.calculator.CalculatorSpecialButton.*;
+import static org.solovyev.android.calculator.CalculatorSpecialButton.cursor_left;
+import static org.solovyev.android.calculator.CalculatorSpecialButton.cursor_right;
+import static org.solovyev.android.calculator.CalculatorSpecialButton.functions_detached;
+import static org.solovyev.android.calculator.CalculatorSpecialButton.history_detached;
+import static org.solovyev.android.calculator.CalculatorSpecialButton.open_app;
+import static org.solovyev.android.calculator.CalculatorSpecialButton.operators_detached;
+import static org.solovyev.android.calculator.CalculatorSpecialButton.settings_detached;
+import static org.solovyev.android.calculator.CalculatorSpecialButton.vars_detached;
 
 /**
  * User: serso
@@ -84,16 +88,13 @@ public enum CalculatorButton {
     equals(R.id.cpp_button_equals, CalculatorSpecialButton.equals);
 
 
-	private final int buttonId;
-
-	@Nonnull
-	private final String onClickText;
-
-	@Nullable
-	private final String onLongClickText;
-
     @Nonnull
     private static SparseArray<CalculatorButton> buttonsByIds = new SparseArray<>();
+    private final int buttonId;
+    @Nonnull
+    private final String onClickText;
+    @Nullable
+    private final String onLongClickText;
 
     CalculatorButton(int buttonId, @Nonnull CalculatorSpecialButton onClickButton, @Nullable CalculatorSpecialButton onLongClickButton) {
         this(buttonId, onClickButton.getActionCode(), onLongClickButton == null ? null : onLongClickButton.getActionCode());
@@ -114,16 +115,6 @@ public enum CalculatorButton {
         this(buttonId, onClickText, null);
     }
 
-	public void onLongClick() {
-		if (onLongClickText != null) {
-			Locator.getInstance().getKeyboard().buttonPressed(onLongClickText);
-		}
-	}
-
-	public void onClick() {
-		Locator.getInstance().getKeyboard().buttonPressed(onClickText);
-	}
-
     @Nullable
     public static CalculatorButton getById(int buttonId) {
         initButtonsByIdsMap();
@@ -146,6 +137,16 @@ public enum CalculatorButton {
         }
     }
 
+    public void onLongClick() {
+        if (onLongClickText != null) {
+            Locator.getInstance().getKeyboard().buttonPressed(onLongClickText);
+        }
+    }
+
+    public void onClick() {
+        Locator.getInstance().getKeyboard().buttonPressed(onClickText);
+    }
+
     public int getButtonId() {
         return buttonId;
     }

android-app/src/main/java/org/solovyev/android/calculator/CalculatorButtons.java

@@ -33,22 +33,23 @@ import android.view.MotionEvent;
 import android.view.View;
 import android.widget.Button;
 import android.widget.RemoteViews;
-import jscl.AngleUnit;
-import jscl.NumeralBase;
 
 import org.solovyev.android.Views;
-import org.solovyev.android.calculator.model.AndroidCalculatorEngine;
-import org.solovyev.android.calculator.view.AngleUnitsButton;
-import org.solovyev.android.calculator.view.NumeralBasesButton;
 import org.solovyev.android.calculator.drag.DragButton;
 import org.solovyev.android.calculator.drag.DragDirection;
 import org.solovyev.android.calculator.drag.SimpleDragListener;
+import org.solovyev.android.calculator.model.AndroidCalculatorEngine;
+import org.solovyev.android.calculator.view.AngleUnitsButton;
+import org.solovyev.android.calculator.view.NumeralBasesButton;
 import org.solovyev.android.calculator.view.ScreenMetrics;
 import org.solovyev.common.math.Point2d;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
+import jscl.AngleUnit;
+import jscl.NumeralBase;
+
 /**
  * User: serso
  * Date: 9/28/12
@@ -123,6 +124,11 @@ public final class CalculatorButtons {
 	**********************************************************************
 	*/
 
+    @Nonnull
+    private static CalculatorKeyboard getKeyboard() {
+        return Locator.getInstance().getKeyboard();
+    }
+
     static class RoundBracketsDragProcessor implements SimpleDragListener.DragProcessor {
 
         @Nonnull
@@ -144,11 +150,6 @@ public final class CalculatorButtons {
         }
     }
 
-	@Nonnull
-	private static CalculatorKeyboard getKeyboard() {
-		return Locator.getInstance().getKeyboard();
-	}
-
     static class VarsDragProcessor implements SimpleDragListener.DragProcessor {
 
         @Nonnull

android-app/src/main/java/org/solovyev/android/calculator/CalculatorDialogActivity.java

@@ -26,21 +26,20 @@ import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
 import android.os.Parcelable;
+import android.support.v7.app.ActionBarActivity;
 import android.text.method.ScrollingMovementMethod;
 import android.view.View;
 import android.widget.Button;
 import android.widget.TextView;
 
-import android.support.v7.app.ActionBarActivity;
-
-import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
-
 import org.solovyev.android.Android;
 import org.solovyev.android.fragments.FragmentUtils;
 import org.solovyev.common.msg.MessageType;
 import org.solovyev.common.text.Strings;
 
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
 /**
  * User: serso
  * Date: 1/20/13
@@ -62,29 +61,6 @@ public class CalculatorDialogActivity extends ActionBarActivity {
         context.startActivity(intent);
     }
 
-	@Override
-	protected void onCreate(@Nullable Bundle in) {
-		super.onCreate(in);
-
-		final DialogData dialogData = readDialogData(getIntent());
-		if (dialogData == null) {
-			Locator.getInstance().getLogger().error(TAG, "Dialog data is null!");
-			this.finish();
-		} else {
-			setContentView(R.layout.cpp_dialog);
-
-			final String title = dialogData.getTitle();
-			if (!Strings.isEmpty(title)) {
-				setTitle(title);
-			}
-
-
-			final Bundle args = new Bundle();
-			args.putParcelable(DIALOG_DATA_EXTRA, ParcelableDialogData.wrap(dialogData));
-			FragmentUtils.createFragment(this, CalculatorDialogFragment.class, R.id.dialog_layout, "dialog", args);
-		}
-	}
-
     @Nullable
     private static DialogData readDialogData(@Nullable Intent in) {
         if (in != null) {
@@ -109,6 +85,29 @@ public class CalculatorDialogActivity extends ActionBarActivity {
         return null;
     }
 
+    @Override
+    protected void onCreate(@Nullable Bundle in) {
+        super.onCreate(in);
+
+        final DialogData dialogData = readDialogData(getIntent());
+        if (dialogData == null) {
+            Locator.getInstance().getLogger().error(TAG, "Dialog data is null!");
+            this.finish();
+        } else {
+            setContentView(R.layout.cpp_dialog);
+
+            final String title = dialogData.getTitle();
+            if (!Strings.isEmpty(title)) {
+                setTitle(title);
+            }
+
+
+            final Bundle args = new Bundle();
+            args.putParcelable(DIALOG_DATA_EXTRA, ParcelableDialogData.wrap(dialogData));
+            FragmentUtils.createFragment(this, CalculatorDialogFragment.class, R.id.dialog_layout, "dialog", args);
+        }
+    }
+
     public static class CalculatorDialogFragment extends CalculatorFragment {
 
         public CalculatorDialogFragment() {

android-app/src/main/java/org/solovyev/android/calculator/CalculatorDisplayFragment.java

@@ -25,12 +25,11 @@ package org.solovyev.android.calculator;
 import android.content.SharedPreferences;
 import android.os.Bundle;
 import android.preference.PreferenceManager;
+import android.support.v4.app.Fragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 
-import android.support.v4.app.Fragment;
-
 import javax.annotation.Nonnull;
 
 /**

android-app/src/main/java/org/solovyev/android/calculator/CalculatorDisplayMenuItem.java

@@ -23,7 +23,7 @@
 package org.solovyev.android.calculator;
 
 import android.content.Context;
-import jscl.math.Generic;
+
 import org.solovyev.android.calculator.jscl.JsclOperation;
 import org.solovyev.android.calculator.plot.CalculatorPlotter;
 import org.solovyev.android.calculator.view.NumeralBaseConverterDialog;
@@ -31,6 +31,8 @@ import org.solovyev.android.menu.LabeledMenuItem;
 
 import javax.annotation.Nonnull;
 
+import jscl.math.Generic;
+
 /**
  * User: Solovyev_S
  * Date: 21.09.12

android-app/src/main/java/org/solovyev/android/calculator/CalculatorDisplayOnClickListener.java

@@ -25,14 +25,14 @@ package org.solovyev.android.calculator;
 import android.support.v4.app.FragmentActivity;
 import android.view.View;
 
-import javax.annotation.Nonnull;
-
 import org.solovyev.android.menu.ContextMenuBuilder;
 import org.solovyev.android.menu.ListContextMenu;
 
 import java.util.ArrayList;
 import java.util.List;
 
+import javax.annotation.Nonnull;
+
 /**
  * User: Solovyev_S
  * Date: 21.09.12

android-app/src/main/java/org/solovyev/android/calculator/CalculatorEditorFragment.java

@@ -27,7 +27,13 @@ import android.content.SharedPreferences;
 import android.os.Bundle;
 import android.preference.PreferenceManager;
 import android.support.v4.app.Fragment;
-import android.view.*;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.MenuItem;
+import android.view.View;
+import android.view.ViewGroup;
+
 import org.solovyev.android.menu.ActivityMenu;
 import org.solovyev.android.menu.AndroidMenuHelper;
 import org.solovyev.android.menu.ListActivityMenu;

android-app/src/main/java/org/solovyev/android/calculator/CalculatorFragment.java

@@ -24,12 +24,11 @@ package org.solovyev.android.calculator;
 
 import android.app.Activity;
 import android.os.Bundle;
+import android.support.v4.app.Fragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 
-import android.support.v4.app.Fragment;
-
 import javax.annotation.Nonnull;
 
 /**

android-app/src/main/java/org/solovyev/android/calculator/CalculatorFragmentType.java

@@ -69,11 +69,9 @@ public enum CalculatorFragmentType {
     matrix_edit(CalculatorMatrixEditFragment.class, R.layout.matrix_edit_fragment, R.string.c_release_notes),
     release_notes(CalculatorReleaseNotesFragment.class, R.layout.release_notes_fragment, R.string.c_release_notes);
 
+    private final int defaultLayoutId;
     @Nonnull
     private Class<? extends Fragment> fragmentClass;
-
-	private final int defaultLayoutId;
-
     private int defaultTitleResId;
 
     private CalculatorFragmentType(@Nonnull Class<? extends Fragment> fragmentClass,

android-app/src/main/java/org/solovyev/android/calculator/CalculatorKeyboardFragment.java

@@ -24,10 +24,10 @@ package org.solovyev.android.calculator;
 
 import android.content.SharedPreferences;
 import android.os.Bundle;
+import android.support.v4.app.Fragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
-import android.support.v4.app.Fragment;
 
 import javax.annotation.Nonnull;
 

android-app/src/main/java/org/solovyev/android/calculator/CalculatorListFragment.java

@@ -24,12 +24,11 @@ package org.solovyev.android.calculator;
 
 import android.app.Activity;
 import android.os.Bundle;
+import android.support.v4.app.ListFragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 
-import android.support.v4.app.ListFragment;
-
 import javax.annotation.Nonnull;
 
 /**

android-app/src/main/java/org/solovyev/android/calculator/CalculatorMenu.java

@@ -25,14 +25,13 @@ package org.solovyev.android.calculator;
 import android.app.Activity;
 import android.content.Context;
 import android.util.Log;
-
 import android.view.MenuItem;
 
-import javax.annotation.Nonnull;
-
 import org.solovyev.android.calculator.view.NumeralBaseConverterDialog;
 import org.solovyev.android.menu.LabeledMenuItem;
 
+import javax.annotation.Nonnull;
+
 /**
  * User: serso
  * Date: 4/23/12

android-app/src/main/java/org/solovyev/android/calculator/CalculatorReceiver.java

@@ -11,6 +11,14 @@ public final class CalculatorReceiver extends BroadcastReceiver {
     public static final String ACTION_BUTTON_ID_EXTRA = "buttonId";
     public static final String ACTION_BUTTON_PRESSED = "org.solovyev.android.calculator.BUTTON_PRESSED";
 
+    @Nonnull
+    public static Intent newButtonClickedIntent(@Nonnull Context context, @Nonnull CalculatorButton button) {
+        final Intent intent = new Intent(context, CalculatorReceiver.class);
+        intent.setAction(ACTION_BUTTON_PRESSED);
+        intent.putExtra(ACTION_BUTTON_ID_EXTRA, button.getButtonId());
+        return intent;
+    }
+
     @Override
     public void onReceive(Context context, Intent intent) {
         final String action = intent.getAction();
@@ -24,12 +32,4 @@ public final class CalculatorReceiver extends BroadcastReceiver {
             }
         }
     }
-
-	@Nonnull
-	public static Intent newButtonClickedIntent(@Nonnull Context context, @Nonnull CalculatorButton button) {
-		final Intent intent = new Intent(context, CalculatorReceiver.class);
-		intent.setAction(ACTION_BUTTON_PRESSED);
-		intent.putExtra(ACTION_BUTTON_ID_EXTRA, button.getButtonId());
-		return intent;
-	}
 }

android-app/src/main/java/org/solovyev/android/calculator/CharacterAtPositionFinder.java

@@ -22,11 +22,11 @@
 
 package org.solovyev.android.calculator;
 
+import org.solovyev.common.JPredicate;
+
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
-import org.solovyev.common.JPredicate;
-
 /**
  * User: serso
  * Date: 10/3/11
@@ -34,10 +34,9 @@ import org.solovyev.common.JPredicate;
  */
 public class CharacterAtPositionFinder implements JPredicate<Character> {
 
-	private int i;
-
     @Nonnull
     private final String targetString;
+    private int i;
 
     public CharacterAtPositionFinder(@Nonnull String targetString, int i) {
         this.targetString = targetString;

android-app/src/main/java/org/solovyev/android/calculator/ConversionMenuItem.java

@@ -23,14 +23,15 @@
 package org.solovyev.android.calculator;
 
 import android.content.Context;
-import jscl.NumeralBase;
-import jscl.math.Generic;
-
-import javax.annotation.Nonnull;
 
 import org.solovyev.android.calculator.jscl.JsclOperation;
 import org.solovyev.android.menu.AMenuItem;
 
+import javax.annotation.Nonnull;
+
+import jscl.NumeralBase;
+import jscl.math.Generic;
+
 /**
  * User: serso
  * Date: 9/21/12

android-app/src/main/java/org/solovyev/android/calculator/CursorDragProcessor.java

@@ -23,6 +23,7 @@
 package org.solovyev.android.calculator;
 
 import android.view.MotionEvent;
+
 import org.solovyev.android.calculator.drag.DirectionDragButton;
 import org.solovyev.android.calculator.drag.DragButton;
 import org.solovyev.android.calculator.drag.DragDirection;

android-app/src/main/java/org/solovyev/android/calculator/DigitButtonDragProcessor.java

@@ -23,6 +23,7 @@
 package org.solovyev.android.calculator;
 
 import android.view.MotionEvent;
+
 import org.solovyev.android.calculator.drag.DirectionDragButton;
 import org.solovyev.android.calculator.drag.DragButton;
 import org.solovyev.android.calculator.drag.DragDirection;

android-app/src/main/java/org/solovyev/android/calculator/EqualsDragProcessor.java

@@ -24,14 +24,14 @@ package org.solovyev.android.calculator;
 
 import android.view.MotionEvent;
 
-import javax.annotation.Nonnull;
-
 import org.solovyev.android.calculator.drag.DirectionDragButton;
 import org.solovyev.android.calculator.drag.DragButton;
 import org.solovyev.android.calculator.drag.DragDirection;
 import org.solovyev.android.calculator.drag.SimpleDragListener;
 import org.solovyev.common.math.Point2d;
 
+import javax.annotation.Nonnull;
+
 /**
  * User: serso
  * Date: 10/24/11

android-app/src/main/java/org/solovyev/android/calculator/FixableMessage.java

@@ -24,6 +24,7 @@ package org.solovyev.android.calculator;
 
 import android.os.Parcel;
 import android.os.Parcelable;
+
 import org.solovyev.common.msg.Message;
 import org.solovyev.common.msg.MessageType;
 
@@ -48,22 +49,10 @@ public class FixableMessage implements Parcelable {
             return new FixableMessage[size];
         }
     };
-
-	@Nonnull
-	private static FixableMessage fromParcel(@Nonnull Parcel in) {
-		final String message = in.readString();
-		final MessageType messageType = (MessageType) in.readSerializable();
-		final FixableError fixableError = (FixableError) in.readSerializable();
-
-		return new FixableMessage(message, messageType, fixableError);
-	}
-
     @Nonnull
     private final String message;
-
     @Nonnull
     private final MessageType messageType;
-
     @Nullable
     private final FixableError fixableError;
 
@@ -82,6 +71,15 @@ public class FixableMessage implements Parcelable {
         this.fixableError = fixableError;
     }
 
+    @Nonnull
+    private static FixableMessage fromParcel(@Nonnull Parcel in) {
+        final String message = in.readString();
+        final MessageType messageType = (MessageType) in.readSerializable();
+        final FixableError fixableError = (FixableError) in.readSerializable();
+
+        return new FixableMessage(message, messageType, fixableError);
+    }
+
     @Override
     public int describeContents() {
         return 0;

android-app/src/main/java/org/solovyev/android/calculator/FixableMessagesDialog.java

@@ -36,14 +36,16 @@ import android.view.ViewGroup;
 import android.widget.Button;
 import android.widget.CheckBox;
 import android.widget.TextView;
+
 import org.solovyev.common.msg.Message;
 import org.solovyev.common.text.Strings;
 
-import javax.annotation.Nonnull;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 
+import javax.annotation.Nonnull;
+
 /**
  * User: serso
  * Date: 11/17/12
@@ -59,6 +61,32 @@ public class FixableMessagesDialog extends ActionBarActivity {
     public FixableMessagesDialog() {
     }
 
+    public static void showDialogForMessages(@Nonnull List<Message> messages,
+                                             @Nonnull Context context,
+                                             boolean showCheckbox) {
+        if (!messages.isEmpty()) {
+            final Intent intent = new Intent(context, FixableMessagesDialog.class);
+
+            intent.putExtra(INPUT, Input.fromMessages(messages, showCheckbox));
+            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+
+            context.startActivity(intent);
+        }
+    }
+
+    public static void showDialog(@Nonnull List<FixableMessage> messages,
+                                  @Nonnull Context context,
+                                  boolean showCheckbox) {
+        if (!messages.isEmpty()) {
+            final Intent intent = new Intent(context, FixableMessagesDialog.class);
+
+            intent.putExtra(INPUT, new Input(messages, showCheckbox));
+            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+
+            context.startActivity(intent);
+        }
+    }
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -99,6 +127,14 @@ public class FixableMessagesDialog extends ActionBarActivity {
         }
     }
 
+	/*
+    **********************************************************************
+	*
+	*                           STATIC
+	*
+	**********************************************************************
+	*/
+
     private void onInputChanged() {
         final ViewGroup viewGroup = (ViewGroup) findViewById(R.id.cpp_fixable_messages_container);
         viewGroup.removeAllViews();
@@ -139,40 +175,6 @@ public class FixableMessagesDialog extends ActionBarActivity {
         parseIntent(intent);
     }
 
-	/*
-	**********************************************************************
-	*
-	*                           STATIC
-	*
-	**********************************************************************
-	*/
-
-	public static void showDialogForMessages(@Nonnull List<Message> messages,
-											 @Nonnull Context context,
-											 boolean showCheckbox) {
-		if (!messages.isEmpty()) {
-			final Intent intent = new Intent(context, FixableMessagesDialog.class);
-
-			intent.putExtra(INPUT, Input.fromMessages(messages, showCheckbox));
-			intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
-
-			context.startActivity(intent);
-		}
-	}
-
-	public static void showDialog(@Nonnull List<FixableMessage> messages,
-								  @Nonnull Context context,
-								  boolean showCheckbox) {
-		if (!messages.isEmpty()) {
-			final Intent intent = new Intent(context, FixableMessagesDialog.class);
-
-			intent.putExtra(INPUT, new Input(messages, showCheckbox));
-			intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
-
-			context.startActivity(intent);
-		}
-	}
-
     private static final class Input implements Parcelable {
 
         public static final Creator<Input> CREATOR = new Creator<Input>() {
@@ -186,6 +188,14 @@ public class FixableMessagesDialog extends ActionBarActivity {
                 return new Input[size];
             }
         };
+        @Nonnull
+        private List<FixableMessage> messages = new ArrayList<FixableMessage>();
+        private boolean showCheckbox;
+
+        private Input(@Nonnull List<FixableMessage> messages, boolean showCheckbox) {
+            this.messages = messages;
+            this.showCheckbox = showCheckbox;
+        }
 
         @Nonnull
         private static Input fromParcel(@Nonnull Parcel in) {
@@ -195,15 +205,14 @@ public class FixableMessagesDialog extends ActionBarActivity {
             return new Input(messages, showCheckbox);
         }
 
-
         @Nonnull
-		private List<FixableMessage> messages = new ArrayList<FixableMessage>();
+        public static Input fromMessages(@Nonnull List<Message> messages, boolean showCheckbox) {
+            final List<FixableMessage> stringMessages = new ArrayList<FixableMessage>(messages.size());
+            for (Message message : messages) {
+                stringMessages.add(new FixableMessage(message));
+            }
 
-		private boolean showCheckbox;
+            return new Input(stringMessages, showCheckbox);
-
-		private Input(@Nonnull List<FixableMessage> messages, boolean showCheckbox) {
-			this.messages = messages;
-			this.showCheckbox = showCheckbox;
         }
 
         @Nonnull
@@ -222,16 +231,6 @@ public class FixableMessagesDialog extends ActionBarActivity {
             out.writeTypedList(messages);
         }
 
-		@Nonnull
-		public static Input fromMessages(@Nonnull List<Message> messages, boolean showCheckbox) {
-			final List<FixableMessage> stringMessages = new ArrayList<FixableMessage>(messages.size());
-			for (Message message : messages) {
-				stringMessages.add(new FixableMessage(message));
-			}
-
-			return new Input(stringMessages, showCheckbox);
-		}
-
         public boolean isShowCheckbox() {
             return showCheckbox;
         }

android-app/src/main/java/org/solovyev/android/calculator/FragmentUi.java

@@ -27,7 +27,6 @@ import android.support.v4.app.FragmentActivity;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
-import android.view.ViewParent;
 import android.widget.TextView;
 
 import org.solovyev.android.checkout.ActivityCheckout;
@@ -125,7 +124,7 @@ public class FragmentUi extends BaseUi {
     }
 
     private void updateAdViewState() {
-		if(adFree == null || adView == null) {
+        if (adFree == null || adView == null) {
             return;
         }
 

android-app/src/main/java/org/solovyev/android/calculator/NumeralBaseButtons.java

@@ -24,11 +24,10 @@ package org.solovyev.android.calculator;
 
 import android.app.Activity;
 import android.content.SharedPreferences;
-import jscl.NumeralBase;
 
 import javax.annotation.Nonnull;
 
-import org.solovyev.android.calculator.model.AndroidCalculatorEngine;
+import jscl.NumeralBase;
 
 import static jscl.NumeralBase.hex;
 import static org.solovyev.android.calculator.Preferences.Gui.hideNumeralBaseDigits;

android-app/src/main/java/org/solovyev/android/calculator/ParcelableDialogData.java

@@ -24,6 +24,7 @@ package org.solovyev.android.calculator;
 
 import android.os.Parcel;
 import android.os.Parcelable;
+
 import org.solovyev.common.msg.MessageLevel;
 import org.solovyev.common.msg.MessageType;
 

android-app/src/main/java/org/solovyev/android/calculator/Preferences.java

@@ -61,265 +61,12 @@ import static org.solovyev.android.DeviceModel.samsung_galaxy_s_2;
 
 public final class Preferences {
 
+    public static final Preference<Integer> appVersion = IntegerPreference.of("application.version", -1);
+    public static final Preference<Integer> appOpenedCounter = IntegerPreference.of("app_opened_counter", 0);
     private Preferences() {
         throw new AssertionError();
     }
 
-	public static final Preference<Integer> appVersion = IntegerPreference.of("application.version", -1);
-	public static final Preference<Integer> appOpenedCounter = IntegerPreference.of("app_opened_counter", 0);
-
-	public enum SimpleTheme {
-
-		default_theme(0, 0, null),
-		metro_blue_theme(R.layout.onscreen_layout, R.layout.widget_layout, Gui.Theme.metro_blue_theme),
-		material_theme(R.layout.onscreen_layout_material, R.layout.widget_layout_material, Gui.Theme.material_theme),
-		material_light_theme(R.layout.onscreen_layout_material_light, R.layout.widget_layout_material_light, Gui.Theme.material_light_theme);
-
-		@LayoutRes
-		private final int onscreenLayout;
-
-		@LayoutRes
-		private final int widgetLayout;
-
-		@Nullable
-		private final Gui.Theme appTheme;
-
-		@Nonnull
-		private final Map<Gui.Theme, SimpleTheme> cache = new EnumMap<>(Gui.Theme.class);
-
-		SimpleTheme(int onscreenLayout, int widgetLayout, @Nullable Gui.Theme appTheme) {
-			this.onscreenLayout = onscreenLayout;
-			this.widgetLayout = widgetLayout;
-			this.appTheme = appTheme;
-		}
-
-		public int getOnscreenLayout(@Nonnull Gui.Theme appTheme) {
-			return resolveThemeFor(appTheme).onscreenLayout;
-		}
-
-		public int getWidgetLayout(@Nonnull Gui.Theme appTheme) {
-			return resolveThemeFor(appTheme).widgetLayout;
-		}
-
-		@Nonnull
-		public SimpleTheme resolveThemeFor(@Nonnull Gui.Theme appTheme) {
-			if (this == default_theme) {
-				SimpleTheme theme = cache.get(appTheme);
-				if (theme == null) {
-					theme = lookUpThemeFor(appTheme);
-					cache.put(appTheme, theme);
-				}
-				return theme;
-			}
-			return this;
-		}
-
-		@Nonnull
-		private SimpleTheme lookUpThemeFor(@Nonnull Gui.Theme appTheme) {
-			Check.isTrue(this == default_theme);
-			// find direct match
-			for (SimpleTheme theme : values()) {
-				if (theme.appTheme == appTheme) {
-					return theme;
-				}
-			}
-
-			// for metro themes return metro theme
-			if (appTheme == Gui.Theme.metro_green_theme || appTheme == Gui.Theme.metro_purple_theme) {
-				return metro_blue_theme;
-			}
-
-			// for old themes return dark material
-			return material_theme;
-		}
-
-		@Nullable
-		public Gui.Theme getAppTheme() {
-			return appTheme;
-		}
-	}
-
-	public static class Widget {
-		public static final Preference<SimpleTheme> theme = StringPreference.ofEnum("widget.theme", SimpleTheme.default_theme, SimpleTheme.class);
-
-		@Nonnull
-		public static SimpleTheme getTheme(@Nonnull SharedPreferences preferences) {
-			return theme.getPreferenceNoError(preferences);
-		}
-
-	}
-	public static class Onscreen {
-		public static final Preference<Boolean> startOnBoot = BooleanPreference.of("onscreen_start_on_boot", false);
-		public static final Preference<Boolean> showAppIcon = BooleanPreference.of("onscreen_show_app_icon", true);
-		public static final Preference<SimpleTheme> theme = StringPreference.ofEnum("onscreen.theme", SimpleTheme.default_theme, SimpleTheme.class);
-
-		@Nonnull
-		public static SimpleTheme getTheme(@Nonnull SharedPreferences preferences) {
-			return theme.getPreferenceNoError(preferences);
-		}
-	}
-
-	public static class Calculations {
-
-		public static final Preference<Boolean> calculateOnFly = BooleanPreference.of("calculations_calculate_on_fly", true);
-		public static final Preference<Boolean> showCalculationMessagesDialog = BooleanPreference.of("show_calculation_messages_dialog", true);
-
-		public static final Preference<NumeralBase> preferredNumeralBase = StringPreference.ofEnum("preferred_numeral_base", AndroidCalculatorEngine.Preferences.numeralBase.getDefaultValue(), NumeralBase.class);
-		public static final Preference<AngleUnit> preferredAngleUnits = StringPreference.ofEnum("preferred_angle_units", AndroidCalculatorEngine.Preferences.angleUnit.getDefaultValue(), AngleUnit.class);
-		public static final Preference<Long> lastPreferredPreferencesCheck = LongPreference.of("preferred_preferences_check_time", 0L);
-
-	}
-
-	public static class Ga {
-		public static final Preference<Boolean> initialReportDone = BooleanPreference.of("ga.initial_report_done", false);
-	}
-
-	public static class Gui {
-
-		public static final Preference<Theme> theme = StringPreference.ofEnum("org.solovyev.android.calculator.CalculatorActivity_calc_theme", Theme.material_theme, Theme.class);
-		public static final Preference<Layout> layout = StringPreference.ofEnum("org.solovyev.android.calculator.CalculatorActivity_calc_layout", Layout.simple, Layout.class);
-		public static final Preference<String> language = StringPreference.of("gui.language", Languages.SYSTEM_LANGUAGE_CODE);
-		public static final Preference<Boolean> feedbackWindowShown = BooleanPreference.of("feedback_window_shown", false);
-		public static final Preference<Boolean> showReleaseNotes = BooleanPreference.of("org.solovyev.android.calculator.CalculatorActivity_show_release_notes", true);
-		public static final Preference<Boolean> usePrevAsBack = BooleanPreference.of("org.solovyev.android.calculator.CalculatorActivity_use_back_button_as_prev", false);
-		public static final Preference<Boolean> showEqualsButton = BooleanPreference.of("showEqualsButton", true);
-		public static final Preference<Boolean> autoOrientation = BooleanPreference.of("autoOrientation", true);
-		public static final Preference<Boolean> hideNumeralBaseDigits = BooleanPreference.of("hideNumeralBaseDigits", true);
-		public static final Preference<Boolean> preventScreenFromFading = BooleanPreference.of("preventScreenFromFading", true);
-		public static final Preference<Boolean> colorDisplay = BooleanPreference.of("org.solovyev.android.calculator.CalculatorModel_color_display", true);
-		public static final Preference<Long> hapticFeedback = NumberToStringPreference.of("hapticFeedback", 60L, Long.class);
-
-		private static final Preference<Boolean> hapticFeedbackEnabled = BooleanPreference.of("org.solovyev.android.calculator.CalculatorModel_haptic_feedback", false);
-		private static final Preference<Long> hapticFeedbackDuration = NumberToStringPreference.of("org.solovyev.android.calculator.CalculatorActivity_calc_haptic_feedback_duration_key", 60L, Long.class);
-
-		@Nonnull
-		public static Theme getTheme(@Nonnull SharedPreferences preferences) {
-			return theme.getPreferenceNoError(preferences);
-		}
-
-		@Nonnull
-		public static Layout getLayout(@Nonnull SharedPreferences preferences) {
-			return layout.getPreferenceNoError(preferences);
-		}
-
-		public enum Theme {
-
-			default_theme(R.style.Cpp_Theme_Gray),
-			violet_theme(R.style.Cpp_Theme_Violet),
-			light_blue_theme(R.style.Cpp_Theme_Blue),
-			metro_blue_theme(R.style.cpp_metro_blue_theme),
-			metro_purple_theme(R.style.cpp_metro_purple_theme),
-			metro_green_theme(R.style.cpp_metro_green_theme),
-			material_theme(R.style.Cpp_Theme_Material),
-			material_light_theme(R.style.Cpp_Theme_Material_Light, R.style.Cpp_Theme_Wizard_Light, R.style.Cpp_Theme_Dialog_Material_Light),
-			;
-
-			private static final SparseArray<TextColor> textColors = new SparseArray<>();
-
-			private final int themeId;
-			private final int wizardThemeId;
-			private final int dialogThemeId;
-
-			Theme(@StyleRes int themeId) {
-				this(themeId, R.style.Cpp_Theme_Wizard, R.style.Cpp_Theme_Dialog_Material);
-			}
-
-			Theme(@StyleRes int themeId, @StyleRes int wizardThemeId, int dialogThemeId) {
-				this.themeId = themeId;
-				this.wizardThemeId = wizardThemeId;
-				this.dialogThemeId = dialogThemeId;
-			}
-
-			public int getThemeId() {
-				return getThemeId(null);
-			}
-
-			public int getThemeId(@Nullable Context context) {
-				if (context instanceof WizardActivity) {
-					return wizardThemeId;
-				}
-				if (context instanceof PurchaseDialogActivity) {
-					return dialogThemeId;
-				}
-				return themeId;
-			}
-
-			@Nonnull
-			public TextColor getTextColor(@Nonnull Context context) {
-				final int themeId = getThemeId(context);
-				TextColor textColor = textColors.get(themeId);
-				if (textColor == null) {
-					final ContextThemeWrapper themeContext = new ContextThemeWrapper(context, themeId);
-					final TypedArray a = themeContext.obtainStyledAttributes(themeId, new int[]{R.attr.cpp_text_color, R.attr.cpp_text_color_error});
-					final int normal = a.getColor(0, Color.BLACK);
-					final int error = a.getColor(1, Color.WHITE);
-					a.recycle();
-					textColor = new TextColor(normal, error);
-					textColors.append(themeId, textColor);
-				}
-				return textColor;
-			}
-
-			public boolean isLight() {
-				return themeId == R.style.Cpp_Theme_Material_Light;
-			}
-		}
-
-		public static final class TextColor {
-			public final int normal;
-			public final int error;
-
-			TextColor(int normal, int error) {
-				this.normal = normal;
-				this.error = error;
-			}
-		}
-
-		public static enum Layout {
-			main_calculator(R.layout.main_calculator, R.string.p_layout_calculator, true),
-			main_calculator_mobile(R.layout.main_calculator_mobile, R.string.p_layout_calculator_mobile, false),
-
-			// not used anymore
-			@Deprecated
-			main_cellphone(R.layout.main_calculator, 0, true),
-
-			simple(R.layout.main_calculator, R.string.p_layout_simple, true),
-			simple_mobile(R.layout.main_calculator_mobile, R.string.p_layout_simple_mobile, false);
-
-			private final int layoutId;
-			private final int nameResId;
-			private final boolean optimized;
-
-			Layout(int layoutId, int nameResId, boolean optimized) {
-				this.layoutId = layoutId;
-				this.nameResId = nameResId;
-				this.optimized = optimized;
-			}
-
-			public int getLayoutId() {
-				return layoutId;
-			}
-
-			public int getNameResId() {
-				return nameResId;
-			}
-
-			public boolean isOptimized() {
-				return optimized;
-			}
-		}
-	}
-
-	public static class Graph {
-		public static final Preference<Boolean> plotImag = BooleanPreference.of("graph_plot_imag", false);
-	}
-
-	public static class History {
-		public static final Preference<Boolean> showIntermediateCalculations = BooleanPreference.of("history_show_intermediate_calculations", false);
-		public static final Preference<Boolean> showDatetime = BooleanPreference.of("history_show_datetime", true);
-	}
-
-
     static void setDefaultValues(@Nonnull SharedPreferences preferences) {
 
         if (!AndroidCalculatorEngine.Preferences.groupingSeparator.isSet(preferences)) {
@@ -404,4 +151,255 @@ public final class Preferences {
         preference.tryPutDefault(preferences);
     }
 
+    public enum SimpleTheme {
+
+        default_theme(0, 0, null),
+        metro_blue_theme(R.layout.onscreen_layout, R.layout.widget_layout, Gui.Theme.metro_blue_theme),
+        material_theme(R.layout.onscreen_layout_material, R.layout.widget_layout_material, Gui.Theme.material_theme),
+        material_light_theme(R.layout.onscreen_layout_material_light, R.layout.widget_layout_material_light, Gui.Theme.material_light_theme);
+
+        @LayoutRes
+        private final int onscreenLayout;
+
+        @LayoutRes
+        private final int widgetLayout;
+
+        @Nullable
+        private final Gui.Theme appTheme;
+
+        @Nonnull
+        private final Map<Gui.Theme, SimpleTheme> cache = new EnumMap<>(Gui.Theme.class);
+
+        SimpleTheme(int onscreenLayout, int widgetLayout, @Nullable Gui.Theme appTheme) {
+            this.onscreenLayout = onscreenLayout;
+            this.widgetLayout = widgetLayout;
+            this.appTheme = appTheme;
+        }
+
+        public int getOnscreenLayout(@Nonnull Gui.Theme appTheme) {
+            return resolveThemeFor(appTheme).onscreenLayout;
+        }
+
+        public int getWidgetLayout(@Nonnull Gui.Theme appTheme) {
+            return resolveThemeFor(appTheme).widgetLayout;
+        }
+
+        @Nonnull
+        public SimpleTheme resolveThemeFor(@Nonnull Gui.Theme appTheme) {
+            if (this == default_theme) {
+                SimpleTheme theme = cache.get(appTheme);
+                if (theme == null) {
+                    theme = lookUpThemeFor(appTheme);
+                    cache.put(appTheme, theme);
+                }
+                return theme;
+            }
+            return this;
+        }
+
+        @Nonnull
+        private SimpleTheme lookUpThemeFor(@Nonnull Gui.Theme appTheme) {
+            Check.isTrue(this == default_theme);
+            // find direct match
+            for (SimpleTheme theme : values()) {
+                if (theme.appTheme == appTheme) {
+                    return theme;
+                }
+            }
+
+            // for metro themes return metro theme
+            if (appTheme == Gui.Theme.metro_green_theme || appTheme == Gui.Theme.metro_purple_theme) {
+                return metro_blue_theme;
+            }
+
+            // for old themes return dark material
+            return material_theme;
+        }
+
+        @Nullable
+        public Gui.Theme getAppTheme() {
+            return appTheme;
+        }
+    }
+
+    public static class Widget {
+        public static final Preference<SimpleTheme> theme = StringPreference.ofEnum("widget.theme", SimpleTheme.default_theme, SimpleTheme.class);
+
+        @Nonnull
+        public static SimpleTheme getTheme(@Nonnull SharedPreferences preferences) {
+            return theme.getPreferenceNoError(preferences);
+        }
+
+    }
+
+    public static class Onscreen {
+        public static final Preference<Boolean> startOnBoot = BooleanPreference.of("onscreen_start_on_boot", false);
+        public static final Preference<Boolean> showAppIcon = BooleanPreference.of("onscreen_show_app_icon", true);
+        public static final Preference<SimpleTheme> theme = StringPreference.ofEnum("onscreen.theme", SimpleTheme.default_theme, SimpleTheme.class);
+
+        @Nonnull
+        public static SimpleTheme getTheme(@Nonnull SharedPreferences preferences) {
+            return theme.getPreferenceNoError(preferences);
+        }
+    }
+
+    public static class Calculations {
+
+        public static final Preference<Boolean> calculateOnFly = BooleanPreference.of("calculations_calculate_on_fly", true);
+        public static final Preference<Boolean> showCalculationMessagesDialog = BooleanPreference.of("show_calculation_messages_dialog", true);
+
+        public static final Preference<NumeralBase> preferredNumeralBase = StringPreference.ofEnum("preferred_numeral_base", AndroidCalculatorEngine.Preferences.numeralBase.getDefaultValue(), NumeralBase.class);
+        public static final Preference<AngleUnit> preferredAngleUnits = StringPreference.ofEnum("preferred_angle_units", AndroidCalculatorEngine.Preferences.angleUnit.getDefaultValue(), AngleUnit.class);
+        public static final Preference<Long> lastPreferredPreferencesCheck = LongPreference.of("preferred_preferences_check_time", 0L);
+
+    }
+
+    public static class Ga {
+        public static final Preference<Boolean> initialReportDone = BooleanPreference.of("ga.initial_report_done", false);
+    }
+
+    public static class Gui {
+
+        public static final Preference<Theme> theme = StringPreference.ofEnum("org.solovyev.android.calculator.CalculatorActivity_calc_theme", Theme.material_theme, Theme.class);
+        public static final Preference<Layout> layout = StringPreference.ofEnum("org.solovyev.android.calculator.CalculatorActivity_calc_layout", Layout.simple, Layout.class);
+        public static final Preference<String> language = StringPreference.of("gui.language", Languages.SYSTEM_LANGUAGE_CODE);
+        public static final Preference<Boolean> feedbackWindowShown = BooleanPreference.of("feedback_window_shown", false);
+        public static final Preference<Boolean> showReleaseNotes = BooleanPreference.of("org.solovyev.android.calculator.CalculatorActivity_show_release_notes", true);
+        public static final Preference<Boolean> usePrevAsBack = BooleanPreference.of("org.solovyev.android.calculator.CalculatorActivity_use_back_button_as_prev", false);
+        public static final Preference<Boolean> showEqualsButton = BooleanPreference.of("showEqualsButton", true);
+        public static final Preference<Boolean> autoOrientation = BooleanPreference.of("autoOrientation", true);
+        public static final Preference<Boolean> hideNumeralBaseDigits = BooleanPreference.of("hideNumeralBaseDigits", true);
+        public static final Preference<Boolean> preventScreenFromFading = BooleanPreference.of("preventScreenFromFading", true);
+        public static final Preference<Boolean> colorDisplay = BooleanPreference.of("org.solovyev.android.calculator.CalculatorModel_color_display", true);
+        public static final Preference<Long> hapticFeedback = NumberToStringPreference.of("hapticFeedback", 60L, Long.class);
+
+        private static final Preference<Boolean> hapticFeedbackEnabled = BooleanPreference.of("org.solovyev.android.calculator.CalculatorModel_haptic_feedback", false);
+        private static final Preference<Long> hapticFeedbackDuration = NumberToStringPreference.of("org.solovyev.android.calculator.CalculatorActivity_calc_haptic_feedback_duration_key", 60L, Long.class);
+
+        @Nonnull
+        public static Theme getTheme(@Nonnull SharedPreferences preferences) {
+            return theme.getPreferenceNoError(preferences);
+        }
+
+        @Nonnull
+        public static Layout getLayout(@Nonnull SharedPreferences preferences) {
+            return layout.getPreferenceNoError(preferences);
+        }
+
+        public enum Theme {
+
+            default_theme(R.style.Cpp_Theme_Gray),
+            violet_theme(R.style.Cpp_Theme_Violet),
+            light_blue_theme(R.style.Cpp_Theme_Blue),
+            metro_blue_theme(R.style.cpp_metro_blue_theme),
+            metro_purple_theme(R.style.cpp_metro_purple_theme),
+            metro_green_theme(R.style.cpp_metro_green_theme),
+            material_theme(R.style.Cpp_Theme_Material),
+            material_light_theme(R.style.Cpp_Theme_Material_Light, R.style.Cpp_Theme_Wizard_Light, R.style.Cpp_Theme_Dialog_Material_Light),;
+
+            private static final SparseArray<TextColor> textColors = new SparseArray<>();
+
+            private final int themeId;
+            private final int wizardThemeId;
+            private final int dialogThemeId;
+
+            Theme(@StyleRes int themeId) {
+                this(themeId, R.style.Cpp_Theme_Wizard, R.style.Cpp_Theme_Dialog_Material);
+            }
+
+            Theme(@StyleRes int themeId, @StyleRes int wizardThemeId, int dialogThemeId) {
+                this.themeId = themeId;
+                this.wizardThemeId = wizardThemeId;
+                this.dialogThemeId = dialogThemeId;
+            }
+
+            public int getThemeId() {
+                return getThemeId(null);
+            }
+
+            public int getThemeId(@Nullable Context context) {
+                if (context instanceof WizardActivity) {
+                    return wizardThemeId;
+                }
+                if (context instanceof PurchaseDialogActivity) {
+                    return dialogThemeId;
+                }
+                return themeId;
+            }
+
+            @Nonnull
+            public TextColor getTextColor(@Nonnull Context context) {
+                final int themeId = getThemeId(context);
+                TextColor textColor = textColors.get(themeId);
+                if (textColor == null) {
+                    final ContextThemeWrapper themeContext = new ContextThemeWrapper(context, themeId);
+                    final TypedArray a = themeContext.obtainStyledAttributes(themeId, new int[]{R.attr.cpp_text_color, R.attr.cpp_text_color_error});
+                    final int normal = a.getColor(0, Color.BLACK);
+                    final int error = a.getColor(1, Color.WHITE);
+                    a.recycle();
+                    textColor = new TextColor(normal, error);
+                    textColors.append(themeId, textColor);
+                }
+                return textColor;
+            }
+
+            public boolean isLight() {
+                return themeId == R.style.Cpp_Theme_Material_Light;
+            }
+        }
+
+        public static enum Layout {
+            main_calculator(R.layout.main_calculator, R.string.p_layout_calculator, true),
+            main_calculator_mobile(R.layout.main_calculator_mobile, R.string.p_layout_calculator_mobile, false),
+
+            // not used anymore
+            @Deprecated
+            main_cellphone(R.layout.main_calculator, 0, true),
+
+            simple(R.layout.main_calculator, R.string.p_layout_simple, true),
+            simple_mobile(R.layout.main_calculator_mobile, R.string.p_layout_simple_mobile, false);
+
+            private final int layoutId;
+            private final int nameResId;
+            private final boolean optimized;
+
+            Layout(int layoutId, int nameResId, boolean optimized) {
+                this.layoutId = layoutId;
+                this.nameResId = nameResId;
+                this.optimized = optimized;
+            }
+
+            public int getLayoutId() {
+                return layoutId;
+            }
+
+            public int getNameResId() {
+                return nameResId;
+            }
+
+            public boolean isOptimized() {
+                return optimized;
+            }
+        }
+
+        public static final class TextColor {
+            public final int normal;
+            public final int error;
+
+            TextColor(int normal, int error) {
+                this.normal = normal;
+                this.error = error;
+            }
+        }
+    }
+
+    public static class Graph {
+        public static final Preference<Boolean> plotImag = BooleanPreference.of("graph_plot_imag", false);
+    }
+
+    public static class History {
+        public static final Preference<Boolean> showIntermediateCalculations = BooleanPreference.of("history_show_intermediate_calculations", false);
+        public static final Preference<Boolean> showDatetime = BooleanPreference.of("history_show_datetime", true);
+    }
+
 }

android-app/src/main/java/org/solovyev/android/calculator/about/CalculatorAboutActivity.java

@@ -23,8 +23,9 @@
 package org.solovyev.android.calculator.about;
 
 import android.os.Bundle;
-import org.solovyev.android.calculator.EmptyActivity;
+
 import org.solovyev.android.calculator.CalculatorFragmentType;
+import org.solovyev.android.calculator.EmptyActivity;
 import org.solovyev.android.calculator.R;
 
 import javax.annotation.Nullable;

android-app/src/main/java/org/solovyev/android/calculator/about/CalculatorAboutFragment.java

@@ -27,6 +27,7 @@ import android.text.method.LinkMovementMethod;
 import android.view.View;
 import android.widget.ImageView;
 import android.widget.TextView;
+
 import org.solovyev.android.calculator.App;
 import org.solovyev.android.calculator.CalculatorFragment;
 import org.solovyev.android.calculator.CalculatorFragmentType;
@@ -60,7 +61,7 @@ public class CalculatorAboutFragment extends CalculatorFragment {
 
         final TextView translatorsTextTextView = (TextView) root.findViewById(R.id.cpp_about_translators_text);
         final TextView translatorsTextView = (TextView) root.findViewById(R.id.cpp_about_translators);
-		if(isEmpty(translatorsTextView.getText())) {
+        if (isEmpty(translatorsTextView.getText())) {
             translatorsTextTextView.setVisibility(GONE);
             translatorsTextView.setVisibility(GONE);
         }

android-app/src/main/java/org/solovyev/android/calculator/about/CalculatorReleaseNotesFragment.java

@@ -27,6 +27,7 @@ import android.text.Html;
 import android.text.method.LinkMovementMethod;
 import android.view.View;
 import android.widget.TextView;
+
 import org.solovyev.android.calculator.CalculatorFragment;
 import org.solovyev.android.calculator.CalculatorFragmentType;
 import org.solovyev.android.calculator.R;

android-app/src/main/java/org/solovyev/android/calculator/drag/DirectionDragButton.java

@@ -30,18 +30,20 @@ import android.graphics.Paint;
 import android.text.TextPaint;
 import android.text.TextUtils;
 import android.util.AttributeSet;
+
 import org.solovyev.common.math.Point2d;
 import org.solovyev.common.text.NumberParser;
 import org.solovyev.common.text.StringCollections;
 import org.solovyev.common.text.Strings;
 
-import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
 import java.util.EnumMap;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
 public class DirectionDragButton extends DragButton {
 
     @Nonnull
@@ -54,203 +56,13 @@ public class DirectionDragButton extends DragButton {
 
     @Nonnull
     private final static String DEFAULT_DIRECTION_TEXT_SCALE = "0.33;0.33;0.33;0.33";
-
-	protected static class DirectionTextData {
-
-		@Nonnull
-		private final GuiDragDirection direction;
-
-		@Nonnull
-		private String text;
-
-		@Nonnull
-		private Point2d position;
-
-		@Nonnull
-		private final TextPaint paint = new TextPaint();
-
-		@Nonnull
-		private Float scale = 0.5f;
-
-		private boolean show = true;
-
-		private DirectionTextData(@Nonnull GuiDragDirection direction, @Nonnull String text) {
-			this.direction = direction;
-			this.text = text;
-		}
-
-		protected void init(@Nonnull Paint basePaint,
-							int color,
-							int alpha) {
-			paint.set(basePaint);
-			paint.setColor(color);
-			paint.setAlpha(alpha);
-			paint.setTextSize(basePaint.getTextSize() * scale);
-		}
-
-		@Nonnull
-		public GuiDragDirection getDirection() {
-			return direction;
-		}
-
-		@Nonnull
-		public String getText() {
-			return text;
-		}
-
-		@Nonnull
-		public Point2d getPosition() {
-			return position;
-		}
-
-		@Nonnull
-		public TextPaint getPaint() {
-			return paint;
-		}
-
-		@Nonnull
-		public Float getScale() {
-			return scale;
-		}
-
-		public boolean isShow() {
-			return show;
-		}
-	}
-
-	public static enum GuiDragDirection {
-		up(DragDirection.up, 0) {
-			@Override
-			public int getAttributeId() {
-				return org.solovyev.android.view.R.styleable.DirectionDragButton_textUp;
-			}
-
-			@Nonnull
-			@Override
-			public Point2d getTextPosition(@Nonnull Paint paint, @Nonnull Paint basePaint, @Nonnull CharSequence text, CharSequence baseText, int w, int h) {
-				return getUpDownTextPosition(paint, basePaint, text, baseText, 1, w, h);
-			}
-		},
-		down(DragDirection.down, 2) {
-			@Override
-			public int getAttributeId() {
-				return org.solovyev.android.view.R.styleable.DirectionDragButton_textDown;
-			}
-
-			@Nonnull
-			@Override
-			public Point2d getTextPosition(@Nonnull Paint paint, @Nonnull Paint basePaint, @Nonnull CharSequence text, CharSequence baseText, int w, int h) {
-				return getUpDownTextPosition(paint, basePaint, text, baseText, -1, w, h);
-			}
-		},
-		left(DragDirection.left, 3) {
-			@Override
-			public int getAttributeId() {
-				return org.solovyev.android.view.R.styleable.DirectionDragButton_textLeft;
-			}
-
-			@Nonnull
-			@Override
-			public Point2d getTextPosition(@Nonnull Paint paint, @Nonnull Paint basePaint, @Nonnull CharSequence text, CharSequence baseText, int w, int h) {
-				return getLeftRightTextPosition(paint, basePaint, text, baseText, w, h, true);
-			}
-		},
-
-		right(DragDirection.right, 1) {
-			@Override
-			public int getAttributeId() {
-				return org.solovyev.android.view.R.styleable.DirectionDragButton_textRight;
-			}
-
-			@Nonnull
-			@Override
-			public Point2d getTextPosition(@Nonnull Paint paint, @Nonnull Paint basePaint, @Nonnull CharSequence text, CharSequence baseText, int w, int h) {
-				return getLeftRightTextPosition(paint, basePaint, text, baseText, w, h, false);
-			}
-		};
-
-		@Nonnull
-		private final DragDirection dragDirection;
-
-		private final int attributePosition;
-
-		GuiDragDirection(@Nonnull DragDirection dragDirection, int attributePosition) {
-			this.dragDirection = dragDirection;
-			this.attributePosition = attributePosition;
-		}
-
-		public abstract int getAttributeId();
-
-		public int getAttributePosition() {
-			return attributePosition;
-		}
-
-		@Nonnull
-		public abstract Point2d getTextPosition(@Nonnull Paint paint, @Nonnull Paint basePaint, @Nonnull CharSequence text, CharSequence baseText, int w, int h);
-
-		@Nonnull
-		private static Point2d getLeftRightTextPosition(@Nonnull Paint paint, @Nonnull Paint basePaint, CharSequence text, @Nonnull CharSequence baseText, int w, int h, boolean left) {
-			final Point2d result = new Point2d();
-
-			if (left) {
-				float width = paint.measureText(" ");
-				result.setX(width);
-			} else {
-				float width = paint.measureText(text.toString() + " ");
-				result.setX(w - width);
-			}
-
-			float selfHeight = paint.ascent() + paint.descent();
-
-			basePaint.measureText(Strings.getNotEmpty(baseText, "|"));
-
-			result.setY(h / 2 - selfHeight / 2);
-
-			return result;
-		}
-
-		@Nonnull
-		private static Point2d getUpDownTextPosition(@Nonnull Paint paint, @Nonnull Paint basePaint, @Nonnull CharSequence text, CharSequence baseText, float direction, int w, int h) {
-			final Point2d result = new Point2d();
-
-			float width = paint.measureText(text.toString() + " ");
-			result.setX(w - width);
-
-			float selfHeight = paint.ascent() + paint.descent();
-
-			basePaint.measureText(Strings.getNotEmpty(baseText, "|"));
-
-			if (direction < 0) {
-				result.setY(h / 2 + h / 3 - selfHeight / 2);
-			} else {
-				result.setY(h / 2 - h / 3 - selfHeight / 2);
-			}
-
-			return result;
-		}
-
-		@Nullable
-		public static GuiDragDirection valueOf(@Nonnull DragDirection dragDirection) {
-			for (GuiDragDirection guiDragDirection : values()) {
-				if (guiDragDirection.dragDirection == dragDirection) {
-					return guiDragDirection;
-				}
-			}
-			return null;
-		}
-	}
-
     @Nonnull
     private final Map<GuiDragDirection, DirectionTextData> textDataMap = new EnumMap<>(GuiDragDirection.class);
-
     @Nonnull
     protected String directionTextScale = DEFAULT_DIRECTION_TEXT_SCALE;
-
     @Nonnull
     protected Integer directionTextAlpha = DEFAULT_DIRECTION_TEXT_ALPHA;
-
     protected int directionTextColor = DEFAULT_DIRECTION_TEXT_COLOR;
-
     private boolean initialized = false;
 
     public DirectionDragButton(Context context, @Nonnull AttributeSet attrs) {
@@ -388,7 +200,6 @@ public class DirectionDragButton extends DragButton {
         }
     }
 
-
     @Nonnull
     public String getDirectionTextScale() {
         return directionTextScale;
@@ -421,4 +232,186 @@ public class DirectionDragButton extends DragButton {
         return result;
     }
 
+
+    public static enum GuiDragDirection {
+        up(DragDirection.up, 0) {
+            @Override
+            public int getAttributeId() {
+                return org.solovyev.android.view.R.styleable.DirectionDragButton_textUp;
+            }
+
+            @Nonnull
+            @Override
+            public Point2d getTextPosition(@Nonnull Paint paint, @Nonnull Paint basePaint, @Nonnull CharSequence text, CharSequence baseText, int w, int h) {
+                return getUpDownTextPosition(paint, basePaint, text, baseText, 1, w, h);
+            }
+        },
+        down(DragDirection.down, 2) {
+            @Override
+            public int getAttributeId() {
+                return org.solovyev.android.view.R.styleable.DirectionDragButton_textDown;
+            }
+
+            @Nonnull
+            @Override
+            public Point2d getTextPosition(@Nonnull Paint paint, @Nonnull Paint basePaint, @Nonnull CharSequence text, CharSequence baseText, int w, int h) {
+                return getUpDownTextPosition(paint, basePaint, text, baseText, -1, w, h);
+            }
+        },
+        left(DragDirection.left, 3) {
+            @Override
+            public int getAttributeId() {
+                return org.solovyev.android.view.R.styleable.DirectionDragButton_textLeft;
+            }
+
+            @Nonnull
+            @Override
+            public Point2d getTextPosition(@Nonnull Paint paint, @Nonnull Paint basePaint, @Nonnull CharSequence text, CharSequence baseText, int w, int h) {
+                return getLeftRightTextPosition(paint, basePaint, text, baseText, w, h, true);
+            }
+        },
+
+        right(DragDirection.right, 1) {
+            @Override
+            public int getAttributeId() {
+                return org.solovyev.android.view.R.styleable.DirectionDragButton_textRight;
+            }
+
+            @Nonnull
+            @Override
+            public Point2d getTextPosition(@Nonnull Paint paint, @Nonnull Paint basePaint, @Nonnull CharSequence text, CharSequence baseText, int w, int h) {
+                return getLeftRightTextPosition(paint, basePaint, text, baseText, w, h, false);
+            }
+        };
+
+        @Nonnull
+        private final DragDirection dragDirection;
+
+        private final int attributePosition;
+
+        GuiDragDirection(@Nonnull DragDirection dragDirection, int attributePosition) {
+            this.dragDirection = dragDirection;
+            this.attributePosition = attributePosition;
+        }
+
+        @Nonnull
+        private static Point2d getLeftRightTextPosition(@Nonnull Paint paint, @Nonnull Paint basePaint, CharSequence text, @Nonnull CharSequence baseText, int w, int h, boolean left) {
+            final Point2d result = new Point2d();
+
+            if (left) {
+                float width = paint.measureText(" ");
+                result.setX(width);
+            } else {
+                float width = paint.measureText(text.toString() + " ");
+                result.setX(w - width);
+            }
+
+            float selfHeight = paint.ascent() + paint.descent();
+
+            basePaint.measureText(Strings.getNotEmpty(baseText, "|"));
+
+            result.setY(h / 2 - selfHeight / 2);
+
+            return result;
+        }
+
+        @Nonnull
+        private static Point2d getUpDownTextPosition(@Nonnull Paint paint, @Nonnull Paint basePaint, @Nonnull CharSequence text, CharSequence baseText, float direction, int w, int h) {
+            final Point2d result = new Point2d();
+
+            float width = paint.measureText(text.toString() + " ");
+            result.setX(w - width);
+
+            float selfHeight = paint.ascent() + paint.descent();
+
+            basePaint.measureText(Strings.getNotEmpty(baseText, "|"));
+
+            if (direction < 0) {
+                result.setY(h / 2 + h / 3 - selfHeight / 2);
+            } else {
+                result.setY(h / 2 - h / 3 - selfHeight / 2);
+            }
+
+            return result;
+        }
+
+        @Nullable
+        public static GuiDragDirection valueOf(@Nonnull DragDirection dragDirection) {
+            for (GuiDragDirection guiDragDirection : values()) {
+                if (guiDragDirection.dragDirection == dragDirection) {
+                    return guiDragDirection;
+                }
+            }
+            return null;
+        }
+
+        public abstract int getAttributeId();
+
+        public int getAttributePosition() {
+            return attributePosition;
+        }
+
+        @Nonnull
+        public abstract Point2d getTextPosition(@Nonnull Paint paint, @Nonnull Paint basePaint, @Nonnull CharSequence text, CharSequence baseText, int w, int h);
+    }
+
+    protected static class DirectionTextData {
+
+        @Nonnull
+        private final GuiDragDirection direction;
+        @Nonnull
+        private final TextPaint paint = new TextPaint();
+        @Nonnull
+        private String text;
+        @Nonnull
+        private Point2d position;
+        @Nonnull
+        private Float scale = 0.5f;
+
+        private boolean show = true;
+
+        private DirectionTextData(@Nonnull GuiDragDirection direction, @Nonnull String text) {
+            this.direction = direction;
+            this.text = text;
+        }
+
+        protected void init(@Nonnull Paint basePaint,
+                            int color,
+                            int alpha) {
+            paint.set(basePaint);
+            paint.setColor(color);
+            paint.setAlpha(alpha);
+            paint.setTextSize(basePaint.getTextSize() * scale);
+        }
+
+        @Nonnull
+        public GuiDragDirection getDirection() {
+            return direction;
+        }
+
+        @Nonnull
+        public String getText() {
+            return text;
+        }
+
+        @Nonnull
+        public Point2d getPosition() {
+            return position;
+        }
+
+        @Nonnull
+        public TextPaint getPaint() {
+            return paint;
+        }
+
+        @Nonnull
+        public Float getScale() {
+            return scale;
+        }
+
+        public boolean isShow() {
+            return show;
+        }
+    }
+
 }

android-app/src/main/java/org/solovyev/android/calculator/drag/DragButton.java

@@ -25,9 +25,9 @@ package org.solovyev.android.calculator.drag;
 import android.content.Context;
 import android.graphics.Canvas;
 import android.util.AttributeSet;
-import android.util.Log;
 import android.view.MotionEvent;
 import android.widget.Button;
+
 import org.solovyev.android.view.AndroidViewUtils;
 import org.solovyev.common.math.Point2d;
 import org.solovyev.common.text.Strings;

android-app/src/main/java/org/solovyev/android/calculator/drag/DragEvent.java

@@ -23,6 +23,7 @@
 package org.solovyev.android.calculator.drag;
 
 import android.view.MotionEvent;
+
 import org.solovyev.common.math.Point2d;
 
 import javax.annotation.Nonnull;

android-app/src/main/java/org/solovyev/android/calculator/drag/DragListener.java

@@ -22,9 +22,10 @@
 
 package org.solovyev.android.calculator.drag;
 
-import javax.annotation.Nonnull;
 import java.util.EventListener;
 
+import javax.annotation.Nonnull;
+
 
 public interface DragListener extends EventListener {
 

android-app/src/main/java/org/solovyev/android/calculator/drag/SimpleDragListener.java

@@ -23,9 +23,7 @@
 package org.solovyev.android.calculator.drag;
 
 import android.content.Context;
-import android.support.v4.view.ViewConfigurationCompat;
 import android.view.MotionEvent;
-import android.view.ViewConfiguration;
 
 import org.solovyev.android.calculator.R;
 import org.solovyev.common.MutableObject;
@@ -34,11 +32,11 @@ import org.solovyev.common.interval.Intervals;
 import org.solovyev.common.math.Maths;
 import org.solovyev.common.math.Point2d;
 
+import java.util.EnumMap;
+
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
-import java.util.EnumMap;
-
 public class SimpleDragListener implements DragListener {
 
     @Nonnull
@@ -63,6 +61,36 @@ public class SimpleDragListener implements DragListener {
         this.minDistancePxs = context.getResources().getDimensionPixelSize(R.dimen.cpp_min_drag_distance);
     }
 
+    @Nonnull
+    private static Interval<Float> makeAngleInterval(@Nonnull DragDirection direction,
+                                                     float leftLimit,
+                                                     float rightLimit) {
+        final Float newLeftLimit;
+        final Float newRightLimit;
+        switch (direction) {
+            case up:
+                newLeftLimit = 180f - rightLimit;
+                newRightLimit = 180f - leftLimit;
+                break;
+            case down:
+                newLeftLimit = leftLimit;
+                newRightLimit = rightLimit;
+                break;
+            case left:
+                newLeftLimit = 90f - rightLimit;
+                newRightLimit = 90f + rightLimit;
+                break;
+            case right:
+                newLeftLimit = 90f - rightLimit;
+                newRightLimit = 90f + rightLimit;
+                break;
+            default:
+                throw new AssertionError();
+        }
+
+        return Intervals.newClosedInterval(newLeftLimit, newRightLimit);
+    }
+
     @Override
     public boolean onDrag(@Nonnull DragButton dragButton, @Nonnull DragEvent event) {
         boolean consumed = false;
@@ -109,34 +137,4 @@ public class SimpleDragListener implements DragListener {
 
         boolean processDragEvent(@Nonnull DragDirection dragDirection, @Nonnull DragButton dragButton, @Nonnull Point2d startPoint2d, @Nonnull MotionEvent motionEvent);
     }
-
-	@Nonnull
-	private static Interval<Float> makeAngleInterval(@Nonnull DragDirection direction,
-													 float leftLimit,
-													 float rightLimit) {
-		final Float newLeftLimit;
-		final Float newRightLimit;
-		switch (direction) {
-			case up:
-				newLeftLimit = 180f - rightLimit;
-				newRightLimit = 180f - leftLimit;
-				break;
-			case down:
-				newLeftLimit = leftLimit;
-				newRightLimit = rightLimit;
-				break;
-			case left:
-				newLeftLimit = 90f - rightLimit;
-				newRightLimit = 90f + rightLimit;
-				break;
-			case right:
-				newLeftLimit = 90f - rightLimit;
-				newRightLimit = 90f + rightLimit;
-				break;
-			default:
-				throw new AssertionError();
-		}
-
-		return Intervals.newClosedInterval(newLeftLimit, newRightLimit);
-	}
 }

android-app/src/main/java/org/solovyev/android/calculator/function/FunctionEditDialogFragment.java

@@ -34,23 +34,33 @@ import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.EditText;
-import jscl.math.Generic;
+
-import jscl.math.function.Constant;
+import org.solovyev.android.calculator.App;
-import jscl.math.function.CustomFunction;
+import org.solovyev.android.calculator.CalculatorDisplayViewState;
-import jscl.math.function.Function;
+import org.solovyev.android.calculator.CalculatorEventData;
-import jscl.math.function.IFunction;
+import org.solovyev.android.calculator.CalculatorEventListener;
-import org.solovyev.android.calculator.*;
+import org.solovyev.android.calculator.CalculatorEventType;
+import org.solovyev.android.calculator.CalculatorUtils;
+import org.solovyev.android.calculator.Locator;
+import org.solovyev.android.calculator.R;
 import org.solovyev.android.calculator.math.edit.CalculatorFunctionsActivity;
 import org.solovyev.android.calculator.math.edit.CalculatorFunctionsFragment;
 import org.solovyev.android.calculator.math.edit.MathEntityRemover;
 import org.solovyev.android.calculator.model.AFunction;
 
-import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Set;
 
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+import jscl.math.Generic;
+import jscl.math.function.Constant;
+import jscl.math.function.CustomFunction;
+import jscl.math.function.Function;
+import jscl.math.function.IFunction;
+
 /**
  * User: serso
  * Date: 11/13/12
@@ -75,6 +85,21 @@ public class FunctionEditDialogFragment extends DialogFragment implements Calcul
         return fragment;
     }
 
+    public static void showDialog(@Nonnull Input input, @Nonnull Context context) {
+        if (context instanceof ActionBarActivity) {
+            FunctionEditDialogFragment.showDialog(input, ((ActionBarActivity) context).getSupportFragmentManager());
+        } else {
+            final Intent intent = new Intent(context, CalculatorFunctionsActivity.class);
+            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+            intent.putExtra(CalculatorFunctionsFragment.CREATE_FUNCTION_EXTRA, input);
+            context.startActivity(intent);
+        }
+    }
+
+    public static void showDialog(@Nonnull Input input, @Nonnull FragmentManager fm) {
+        App.showDialog(create(input), "function-editor", fm);
+    }
+
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -168,6 +193,14 @@ public class FunctionEditDialogFragment extends DialogFragment implements Calcul
         Locator.getInstance().getCalculator().addCalculatorEventListener(this);
     }
 
+    	/*
+    **********************************************************************
+	*
+	*                           STATIC
+	*
+	**********************************************************************
+	*/
+
     @Override
     public void onPause() {
         Locator.getInstance().getCalculator().removeCalculatorEventListener(this);
@@ -189,43 +222,8 @@ public class FunctionEditDialogFragment extends DialogFragment implements Calcul
         }
     }
 
-    	/*
-	**********************************************************************
-	*
-	*                           STATIC
-	*
-	**********************************************************************
-	*/
-
-	public static void showDialog(@Nonnull Input input, @Nonnull Context context) {
-		if (context instanceof ActionBarActivity) {
-			FunctionEditDialogFragment.showDialog(input, ((ActionBarActivity) context).getSupportFragmentManager());
-		} else {
-			final Intent intent = new Intent(context, CalculatorFunctionsActivity.class);
-			intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
-			intent.putExtra(CalculatorFunctionsFragment.CREATE_FUNCTION_EXTRA, input);
-			context.startActivity(intent);
-		}
-	}
-
-	public static void showDialog(@Nonnull Input input, @Nonnull FragmentManager fm) {
-		App.showDialog(create(input), "function-editor", fm);
-	}
-
     public static class Input implements Parcelable {
 
-		public static final Parcelable.Creator<Input> CREATOR = new Creator<Input>() {
-			@Override
-			public Input createFromParcel(@Nonnull Parcel in) {
-				return Input.fromParcel(in);
-			}
-
-			@Override
-			public Input[] newArray(int size) {
-				return new Input[size];
-			}
-		};
-
         private static final Parcelable.Creator<String> STRING_CREATOR = new Creator<String>() {
             @Override
             public String createFromParcel(@Nonnull Parcel in) {
@@ -237,6 +235,30 @@ public class FunctionEditDialogFragment extends DialogFragment implements Calcul
                 return new String[size];
             }
         };
+        @Nullable
+        private AFunction function;
+        @Nullable
+        private String name;
+        @Nullable
+        private String content;
+        @Nullable
+        private String description;
+        @Nullable
+        private List<String> parameterNames;
+        public static final Parcelable.Creator<Input> CREATOR = new Creator<Input>() {
+            @Override
+            public Input createFromParcel(@Nonnull Parcel in) {
+                return Input.fromParcel(in);
+            }
+
+            @Override
+            public Input[] newArray(int size) {
+                return new Input[size];
+            }
+        };
+
+        private Input() {
+        }
 
         @Nonnull
         private static Input fromParcel(@Nonnull Parcel in) {
@@ -254,24 +276,6 @@ public class FunctionEditDialogFragment extends DialogFragment implements Calcul
             return result;
         }
 
-		@Nullable
-		private AFunction function;
-
-		@Nullable
-		private String name;
-
-		@Nullable
-		private String content;
-
-		@Nullable
-		private String description;
-
-		@Nullable
-		private List<String> parameterNames;
-
-		private Input() {
-		}
-
         @Nonnull
         public static Input newInstance() {
             return new Input();
@@ -303,6 +307,24 @@ public class FunctionEditDialogFragment extends DialogFragment implements Calcul
             return result;
         }
 
+        @Nonnull
+        public static Input newFromDisplay(@Nonnull CalculatorDisplayViewState viewState) {
+            final Input result = new Input();
+
+            result.content = viewState.getText();
+            final Generic generic = viewState.getResult();
+            if (generic != null) {
+                final Set<Constant> constants = CalculatorUtils.getNotSystemConstants(generic);
+                final List<String> parameterNames = new ArrayList<String>(constants.size());
+                for (Constant constant : constants) {
+                    parameterNames.add(constant.getName());
+                }
+                result.parameterNames = parameterNames;
+            }
+
+            return result;
+        }
+
         @Nullable
         public AFunction getFunction() {
             return function;
@@ -341,23 +363,5 @@ public class FunctionEditDialogFragment extends DialogFragment implements Calcul
             out.writeList(parameterNames);
             out.writeSerializable(function);
         }
-
-		@Nonnull
-		public static Input newFromDisplay(@Nonnull CalculatorDisplayViewState viewState) {
-			final Input result = new Input();
-
-			result.content = viewState.getText();
-			final Generic generic = viewState.getResult();
-			if (generic != null) {
-				final Set<Constant> constants = CalculatorUtils.getNotSystemConstants(generic);
-				final List<String> parameterNames = new ArrayList<String>(constants.size());
-				for (Constant constant : constants) {
-					parameterNames.add(constant.getName());
-				}
-				result.parameterNames = parameterNames;
-			}
-
-			return result;
-		}
     }
 }

android-app/src/main/java/org/solovyev/android/calculator/function/FunctionEditorSaver.java

@@ -24,12 +24,6 @@ package org.solovyev.android.calculator.function;
 
 import android.view.View;
 import android.widget.EditText;
-import jscl.CustomFunctionCalculationException;
-import jscl.math.function.Function;
-import jscl.math.function.IFunction;
-
-import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
 
 import org.solovyev.android.calculator.CalculatorFunctionsMathRegistry;
 import org.solovyev.android.calculator.CalculatorMathRegistry;
@@ -43,6 +37,13 @@ import org.solovyev.common.text.Strings;
 import java.util.Collections;
 import java.util.List;
 
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+import jscl.CustomFunctionCalculationException;
+import jscl.math.function.Function;
+import jscl.math.function.IFunction;
+
 public class FunctionEditorSaver implements View.OnClickListener {
 
     @Nonnull
@@ -74,6 +75,23 @@ public class FunctionEditorSaver implements View.OnClickListener {
         this.source = source;
     }
 
+    @Nonnull
+    public static FunctionEditDialogFragment.Input readInput(@Nullable IFunction function, @Nonnull View root) {
+        final EditText editName = (EditText) root.findViewById(R.id.function_edit_name);
+        String name = editName.getText().toString();
+
+        final EditText editValue = (EditText) root.findViewById(R.id.function_edit_value);
+        String content = editValue.getText().toString();
+
+        final EditText editDescription = (EditText) root.findViewById(R.id.function_edit_description);
+        String description = editDescription.getText().toString();
+
+        final FunctionParamsView editParams = (FunctionParamsView) root.findViewById(R.id.function_params_layout);
+        List<String> parameterNames = editParams.getParameterNames();
+
+        return FunctionEditDialogFragment.Input.newInstance(function, name, content, description, parameterNames);
+    }
+
     @Override
     public void onClick(View v) {
         final Integer error;
@@ -135,23 +153,6 @@ public class FunctionEditorSaver implements View.OnClickListener {
         }
     }
 
-	@Nonnull
-	public static FunctionEditDialogFragment.Input readInput(@Nullable IFunction function, @Nonnull View root) {
-		final EditText editName = (EditText) root.findViewById(R.id.function_edit_name);
-		String name = editName.getText().toString();
-
-		final EditText editValue = (EditText) root.findViewById(R.id.function_edit_value);
-		String content = editValue.getText().toString();
-
-		final EditText editDescription = (EditText) root.findViewById(R.id.function_edit_description);
-		String description = editDescription.getText().toString();
-
-		final FunctionParamsView editParams = (FunctionParamsView) root.findViewById(R.id.function_params_layout);
-		List<String> parameterNames = editParams.getParameterNames();
-
-		return FunctionEditDialogFragment.Input.newInstance(function, name, content, description, parameterNames);
-	}
-
     private boolean validateParameters(@Nonnull List<String> parameterNames) {
         for (String parameterName : parameterNames) {
             if (!VarEditorSaver.isValidName(parameterName)) {

android-app/src/main/java/org/solovyev/android/calculator/function/FunctionParamsView.java

@@ -32,25 +32,26 @@ import android.view.ViewGroup;
 import android.widget.EditText;
 import android.widget.LinearLayout;
 import android.widget.TextView;
-import jscl.text.MutableInt;
+
 import org.solovyev.android.calculator.R;
 
-import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+import jscl.text.MutableInt;
+
 public class FunctionParamsView extends LinearLayout {
 
+    private static final String PARAM_TAG_PREFIX = "function_param_";
     @Nonnull
     private final MutableInt paramsCount = new MutableInt(0);
-
     @Nonnull
     private final List<Integer> paramIds = new ArrayList<Integer>(10);
 
-	private static final String PARAM_TAG_PREFIX = "function_param_";
-
     public FunctionParamsView(Context context) {
         super(context);
     }

android-app/src/main/java/org/solovyev/android/calculator/ga/Ga.java

@@ -4,20 +4,23 @@ import android.content.Context;
 import android.content.SharedPreferences;
 import android.text.TextUtils;
 import android.util.Log;
+
 import com.google.android.gms.analytics.GoogleAnalytics;
 import com.google.android.gms.analytics.HitBuilders;
 import com.google.android.gms.analytics.Tracker;
+
 import org.solovyev.android.calculator.Preferences;
 import org.solovyev.android.calculator.R;
 import org.solovyev.common.listeners.JEvent;
 import org.solovyev.common.listeners.JEventListener;
 import org.solovyev.common.listeners.JEventListeners;
 
-import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
 import java.io.ByteArrayOutputStream;
 import java.io.PrintStream;
 
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
 public final class Ga implements SharedPreferences.OnSharedPreferenceChangeListener {
 
     private static final int LAYOUT = 1;

android-app/src/main/java/org/solovyev/android/calculator/history/AndroidCalculatorHistory.java

@@ -26,14 +26,16 @@ import android.app.Application;
 import android.content.Context;
 import android.content.SharedPreferences;
 import android.preference.PreferenceManager;
+
 import org.solovyev.android.calculator.Calculator;
 import org.solovyev.android.calculator.CalculatorEventData;
 import org.solovyev.android.calculator.CalculatorEventType;
 import org.solovyev.common.history.HistoryAction;
 
+import java.util.List;
+
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
-import java.util.List;
 
 /**
  * User: serso

android-app/src/main/java/org/solovyev/android/calculator/history/BaseHistoryFragment.java

@@ -88,9 +88,6 @@ public abstract class BaseHistoryFragment extends ListFragment implements Calcul
 	**********************************************************************
 	*/
 
-	@Nonnull
-	private static final String TAG = "CalculatorHistoryFragment";
-
     public static final Comparator<CalculatorHistoryState> COMPARATOR = new Comparator<CalculatorHistoryState>() {
         @Override
         public int compare(CalculatorHistoryState state1, CalculatorHistoryState state2) {
@@ -105,6 +102,8 @@ public abstract class BaseHistoryFragment extends ListFragment implements Calcul
             return 0;
         }
     };
+    @Nonnull
+    private static final String TAG = "CalculatorHistoryFragment";
 
 	/*
 	**********************************************************************
@@ -113,19 +112,9 @@ public abstract class BaseHistoryFragment extends ListFragment implements Calcul
 	*
 	**********************************************************************
 	*/
-
-
-	@Nonnull
-	private HistoryArrayAdapter adapter;
-
-	@Nonnull
-	private FragmentUi ui;
-
     private final ActivityMenu<Menu, MenuItem> menu = ListActivityMenu.fromResource(R.menu.history_menu, HistoryMenu.class, AndroidMenuHelper.getInstance(), new HistoryMenuFilter());
-
     @Nonnull
     private final SharedPreferences.OnSharedPreferenceChangeListener preferencesListener = new HistoryOnPreferenceChangeListener();
-
     @Nonnull
     private final DialogInterface.OnClickListener clearDialogListener = new DialogInterface.OnClickListener() {
         @Override
@@ -137,6 +126,10 @@ public abstract class BaseHistoryFragment extends ListFragment implements Calcul
             }
         }
     };
+    @Nonnull
+    private HistoryArrayAdapter adapter;
+    @Nonnull
+    private FragmentUi ui;
     @Nullable
     private AlertDialog clearDialog;
 
@@ -144,6 +137,51 @@ public abstract class BaseHistoryFragment extends ListFragment implements Calcul
         ui = CalculatorApplication.getInstance().createFragmentHelper(fragmentType.getDefaultLayoutId(), fragmentType.getDefaultTitleResId(), false);
     }
 
+    public static boolean isAlreadySaved(@Nonnull CalculatorHistoryState historyState) {
+        if (historyState.isSaved()) throw new AssertionError();
+
+        boolean result = false;
+        try {
+            historyState.setSaved(true);
+            if (Collections.contains(historyState, Locator.getInstance().getHistory().getSavedHistory(), new Equalizer<CalculatorHistoryState>() {
+                @Override
+                public boolean areEqual(@Nullable CalculatorHistoryState first, @Nullable CalculatorHistoryState second) {
+                    return first != null && second != null &&
+                            first.getTime() == second.getTime() &&
+                            first.getDisplayState().equals(second.getDisplayState()) &&
+                            first.getEditorState().equals(second.getEditorState());
+                }
+            })) {
+                result = true;
+            }
+        } finally {
+            historyState.setSaved(false);
+        }
+        return result;
+    }
+
+    public static void useHistoryItem(@Nonnull final CalculatorHistoryState historyState) {
+        App.getVibrator().vibrate();
+        Locator.getInstance().getCalculator().fireCalculatorEvent(CalculatorEventType.use_history_state, historyState);
+    }
+
+    @Nonnull
+    public static String getHistoryText(@Nonnull CalculatorHistoryState state) {
+        final StringBuilder result = new StringBuilder();
+        result.append(state.getEditorState().getText());
+        result.append(getIdentitySign(state.getDisplayState().getJsclOperation()));
+        final String expressionResult = state.getDisplayState().getEditorState().getText();
+        if (expressionResult != null) {
+            result.append(expressionResult);
+        }
+        return result.toString();
+    }
+
+    @Nonnull
+    private static String getIdentitySign(@Nonnull JsclOperation jsclOperation) {
+        return jsclOperation == JsclOperation.simplify ? "≡" : "=";
+    }
+
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -287,34 +325,6 @@ public abstract class BaseHistoryFragment extends ListFragment implements Calcul
         adapter.notifyDataSetChanged();
     }
 
-	public static boolean isAlreadySaved(@Nonnull CalculatorHistoryState historyState) {
-		if (historyState.isSaved()) throw new AssertionError();
-
-		boolean result = false;
-		try {
-			historyState.setSaved(true);
-			if (Collections.contains(historyState, Locator.getInstance().getHistory().getSavedHistory(), new Equalizer<CalculatorHistoryState>() {
-				@Override
-				public boolean areEqual(@Nullable CalculatorHistoryState first, @Nullable CalculatorHistoryState second) {
-					return first != null && second != null &&
-							first.getTime() == second.getTime() &&
-							first.getDisplayState().equals(second.getDisplayState()) &&
-							first.getEditorState().equals(second.getEditorState());
-				}
-			})) {
-				result = true;
-			}
-		} finally {
-			historyState.setSaved(false);
-		}
-		return result;
-	}
-
-	public static void useHistoryItem(@Nonnull final CalculatorHistoryState historyState) {
-		App.getVibrator().vibrate();
-		Locator.getInstance().getCalculator().fireCalculatorEvent(CalculatorEventType.use_history_state, historyState);
-	}
-
     @Nonnull
     private List<CalculatorHistoryState> getHistoryList() {
         final List<CalculatorHistoryState> calculatorHistoryStates = getHistoryItems();
@@ -337,23 +347,6 @@ public abstract class BaseHistoryFragment extends ListFragment implements Calcul
     @Nonnull
     protected abstract List<CalculatorHistoryState> getHistoryItems();
 
-	@Nonnull
-	public static String getHistoryText(@Nonnull CalculatorHistoryState state) {
-		final StringBuilder result = new StringBuilder();
-		result.append(state.getEditorState().getText());
-		result.append(getIdentitySign(state.getDisplayState().getJsclOperation()));
-		final String expressionResult = state.getDisplayState().getEditorState().getText();
-		if (expressionResult != null) {
-			result.append(expressionResult);
-		}
-		return result.toString();
-	}
-
-	@Nonnull
-	private static String getIdentitySign(@Nonnull JsclOperation jsclOperation) {
-		return jsclOperation == JsclOperation.simplify ? "≡" : "=";
-	}
-
     protected abstract void clearHistory();
 
     @Nonnull

android-app/src/main/java/org/solovyev/android/calculator/history/CalculatorHistoryActivity.java

@@ -23,7 +23,12 @@
 package org.solovyev.android.calculator.history;
 
 import android.os.Bundle;
-import org.solovyev.android.calculator.*;
+
+import org.solovyev.android.calculator.BaseActivity;
+import org.solovyev.android.calculator.CalculatorEventData;
+import org.solovyev.android.calculator.CalculatorEventListener;
+import org.solovyev.android.calculator.CalculatorEventType;
+import org.solovyev.android.calculator.R;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;

android-app/src/main/java/org/solovyev/android/calculator/history/HistoryArrayAdapter.java

@@ -29,13 +29,16 @@ import android.view.ViewGroup;
 import android.widget.ArrayAdapter;
 import android.widget.ImageView;
 import android.widget.TextView;
+
 import org.solovyev.android.calculator.R;
 import org.solovyev.common.text.Strings;
 
-import javax.annotation.Nonnull;
 import java.util.List;
 
-import static android.view.View.*;
+import javax.annotation.Nonnull;
+
+import static android.view.View.GONE;
+import static android.view.View.VISIBLE;
 import static org.solovyev.android.calculator.CalculatorFragmentType.saved_history;
 import static org.solovyev.android.calculator.history.BaseHistoryFragment.isAlreadySaved;
 

android-app/src/main/java/org/solovyev/android/calculator/history/HistoryFragment.java

@@ -26,15 +26,15 @@ import android.content.SharedPreferences;
 import android.preference.PreferenceManager;
 
 import org.solovyev.android.calculator.CalculatorFragmentType;
-import org.solovyev.android.calculator.Preferences;
 import org.solovyev.android.calculator.Locator;
+import org.solovyev.android.calculator.Preferences;
 import org.solovyev.android.calculator.R;
 
-import javax.annotation.Nonnull;
-
 import java.util.ArrayList;
 import java.util.List;
 
+import javax.annotation.Nonnull;
+
 public class HistoryFragment extends BaseHistoryFragment {
 
     public HistoryFragment() {

android-app/src/main/java/org/solovyev/android/calculator/history/HistoryItemMenuItem.java

@@ -33,13 +33,13 @@ import android.widget.EditText;
 import android.widget.TextView;
 import android.widget.Toast;
 
-import javax.annotation.Nonnull;
-
 import org.solovyev.android.calculator.Locator;
 import org.solovyev.android.calculator.R;
 import org.solovyev.android.menu.LabeledMenuItem;
 import org.solovyev.common.text.Strings;
 
+import javax.annotation.Nonnull;
+
 /**
  * User: serso
  * Date: 12/18/11
@@ -117,6 +117,12 @@ public enum HistoryItemMenuItem implements LabeledMenuItem<HistoryItemMenuData>
         }
     };
 
+    private final int captionId;
+
+    private HistoryItemMenuItem(int captionId) {
+        this.captionId = captionId;
+    }
+
     private static void createEditHistoryDialog(@Nonnull final HistoryItemMenuData data, @Nonnull final Context context, final boolean save) {
         final CalculatorHistoryState historyState = data.getHistoryState();
 
@@ -154,12 +160,6 @@ public enum HistoryItemMenuItem implements LabeledMenuItem<HistoryItemMenuData>
         builder.create().show();
     }
 
-	private final int captionId;
-
-	private HistoryItemMenuItem(int captionId) {
-		this.captionId = captionId;
-	}
-
     @Nonnull
     @Override
     public String getCaption(@Nonnull Context context) {

android-app/src/main/java/org/solovyev/android/calculator/history/SavedHistoryFragment.java

@@ -26,10 +26,11 @@ import org.solovyev.android.calculator.CalculatorFragmentType;
 import org.solovyev.android.calculator.Locator;
 import org.solovyev.android.calculator.R;
 
-import javax.annotation.Nonnull;
 import java.util.ArrayList;
 import java.util.List;
 
+import javax.annotation.Nonnull;
+
 public class SavedHistoryFragment extends BaseHistoryFragment {
 
     public SavedHistoryFragment() {

android-app/src/main/java/org/solovyev/android/calculator/history/TextViewEditorAdapter.java

@@ -25,11 +25,11 @@ package org.solovyev.android.calculator.history;
 import android.widget.EditText;
 import android.widget.TextView;
 
+import org.solovyev.android.calculator.Editor;
+
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
-import org.solovyev.android.calculator.Editor;
-
 /**
  * User: serso
  * Date: 12/17/11

android-app/src/main/java/org/solovyev/android/calculator/language/Language.java

@@ -25,15 +25,6 @@ public final class Language {
         this.name = makeName(code, locale);
     }
 
-	@Nonnull
-	public String getName(@Nonnull Context context) {
-		if (!isSystem()) {
-			return name;
-		} else {
-			return context.getString(R.string.cpp_system_language) + " (" + locale.getDisplayLanguage(locale) + ")";
-		}
-	}
-
     @Nonnull
     private static String makeName(@Nonnull String code, @Nonnull Locale locale) {
         if (code.equals(Languages.SYSTEM_LANGUAGE_CODE)) {
@@ -48,6 +39,15 @@ public final class Language {
         return locale.getDisplayName(locale);
     }
 
+    @Nonnull
+    public String getName(@Nonnull Context context) {
+        if (!isSystem()) {
+            return name;
+        } else {
+            return context.getString(R.string.cpp_system_language) + " (" + locale.getDisplayLanguage(locale) + ")";
+        }
+    }
+
     public boolean isSystem() {
         return code.equals(Languages.SYSTEM_LANGUAGE_CODE);
     }

android-app/src/main/java/org/solovyev/android/calculator/language/Languages.java

@@ -23,15 +23,50 @@ import javax.annotation.Nullable;
 
 public final class Languages implements SharedPreferences.OnSharedPreferenceChangeListener {
 
-	@Nonnull
-	private static final Locale[] locales = Locale.getAvailableLocales();
     @Nonnull
     public static final String SYSTEM_LANGUAGE_CODE = "00";
     @Nonnull
     public static final Language SYSTEM_LANGUAGE = new Language(SYSTEM_LANGUAGE_CODE, Locale.getDefault());
     @Nonnull
+    private static final Locale[] locales = Locale.getAvailableLocales();
+    @Nonnull
     private final List<Language> list = new ArrayList<>();
 
+    @Nullable
+    private static Language makeLanguage(@Nonnull String localeId) {
+        final Locale locale = findLocaleById(localeId);
+        if (locale == null) {
+            return null;
+        }
+        return new Language(localeId, locale);
+    }
+
+    @Nullable
+    private static Locale findLocaleById(@Nonnull String id) {
+        for (Locale locale : locales) {
+            if (TextUtils.equals(locale.toString(), id)) {
+                return locale;
+            }
+        }
+
+        final String language;
+        final int underscore = id.indexOf("_");
+        if (underscore >= 0) {
+            language = id.substring(0, underscore);
+        } else {
+            language = id;
+        }
+
+        for (Locale locale : locales) {
+            if (TextUtils.equals(locale.getLanguage(), language)) {
+                return locale;
+            }
+        }
+
+        Log.d("Languages", "No locale found for " + id);
+        return null;
+    }
+
     public void init(@Nonnull SharedPreferences preferences) {
         preferences.registerOnSharedPreferenceChangeListener(this);
     }
@@ -83,41 +118,6 @@ public final class Languages implements SharedPreferences.OnSharedPreferenceChan
         }
     }
 
-	@Nullable
-	private static Language makeLanguage(@Nonnull String localeId) {
-		final Locale locale = findLocaleById(localeId);
-		if (locale == null) {
-			return null;
-		}
-		return new Language(localeId, locale);
-	}
-
-	@Nullable
-	private static Locale findLocaleById(@Nonnull String id) {
-		for (Locale locale : locales) {
-			if (TextUtils.equals(locale.toString(), id)) {
-				return locale;
-			}
-		}
-
-		final String language;
-		final int underscore = id.indexOf("_");
-		if (underscore >= 0) {
-			language = id.substring(0, underscore);
-		} else {
-			language = id;
-		}
-
-		for (Locale locale : locales) {
-			if (TextUtils.equals(locale.getLanguage(), language)) {
-				return locale;
-			}
-		}
-
-		Log.d("Languages", "No locale found for " + id);
-		return null;
-	}
-
     @Nonnull
     public Language getCurrent() {
         return get(Preferences.Gui.language.getPreference(App.getPreferences()));

android-app/src/main/java/org/solovyev/android/calculator/math/edit/AbstractMathEntityListFragment.java

@@ -84,23 +84,30 @@ public abstract class AbstractMathEntityListFragment<T extends MathEntity> exten
 	*
 	**********************************************************************
 	*/
-
+    @Nonnull
+    private final FragmentUi ui;
+    @Nonnull
+    private final Handler uiHandler = new Handler();
     @Nullable
     private MathEntityArrayAdapter<T> adapter;
-
     @Nullable
     private String category;
 
-	@Nonnull
-	private final FragmentUi ui;
-
-	@Nonnull
-	private final Handler uiHandler = new Handler();
-
     protected AbstractMathEntityListFragment(@Nonnull CalculatorFragmentType fragmentType) {
         ui = CalculatorApplication.getInstance().createFragmentHelper(fragmentType.getDefaultLayoutId(), fragmentType.getDefaultTitleResId());
     }
 
+    @Nonnull
+    public static Bundle createBundleFor(@Nonnull String categoryId) {
+        final Bundle result = new Bundle(1);
+        putCategory(result, categoryId);
+        return result;
+    }
+
+    static void putCategory(@Nonnull Bundle bundle, @Nonnull String categoryId) {
+        bundle.putString(MATH_ENTITY_CATEGORY_EXTRA_STRING, categoryId);
+    }
+
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -235,6 +242,52 @@ public abstract class AbstractMathEntityListFragment<T extends MathEntity> exten
         }
     }
 
+    public void addToAdapter(@Nonnull T mathEntity) {
+        if (this.adapter != null) {
+            this.adapter.add(mathEntity);
+        }
+    }
+
+    public void removeFromAdapter(@Nonnull T mathEntity) {
+        if (this.adapter != null) {
+            this.adapter.remove(mathEntity);
+        }
+    }
+
+    public void notifyAdapter() {
+        if (this.adapter != null) {
+            this.adapter.notifyDataSetChanged();
+        }
+    }
+
+    @Nullable
+    protected MathEntityArrayAdapter<T> getAdapter() {
+        return adapter;
+    }
+
+    @Nonnull
+    protected Handler getUiHandler() {
+        return uiHandler;
+    }
+
+    @Override
+    public void onCalculatorEvent(@Nonnull CalculatorEventData calculatorEventData, @Nonnull CalculatorEventType calculatorEventType, @Nullable Object data) {
+    }
+
+	/*
+	**********************************************************************
+	*
+	*                           STATIC
+	*
+	**********************************************************************
+	*/
+
+    protected static interface MathEntityDescriptionGetter {
+
+        @Nullable
+        String getDescription(@Nonnull Context context, @Nonnull String mathEntityName);
+    }
+
     protected static class MathEntityArrayAdapter<T extends MathEntity> extends ArrayAdapter<T> {
 
         @Nonnull
@@ -295,61 +348,4 @@ public abstract class AbstractMathEntityListFragment<T extends MathEntity> exten
             return this.mathRegistry.getDescription(mathEntityName);
         }
     }
-
-	protected static interface MathEntityDescriptionGetter {
-
-		@Nullable
-		String getDescription(@Nonnull Context context, @Nonnull String mathEntityName);
-	}
-
-	public void addToAdapter(@Nonnull T mathEntity) {
-		if (this.adapter != null) {
-			this.adapter.add(mathEntity);
-		}
-	}
-
-	public void removeFromAdapter(@Nonnull T mathEntity) {
-		if (this.adapter != null) {
-			this.adapter.remove(mathEntity);
-		}
-	}
-
-	public void notifyAdapter() {
-		if (this.adapter != null) {
-			this.adapter.notifyDataSetChanged();
-		}
-	}
-
-	@Nullable
-	protected MathEntityArrayAdapter<T> getAdapter() {
-		return adapter;
-	}
-
-	@Nonnull
-	protected Handler getUiHandler() {
-		return uiHandler;
-	}
-
-	/*
-	**********************************************************************
-	*
-	*                           STATIC
-	*
-	**********************************************************************
-	*/
-
-	@Nonnull
-	public static Bundle createBundleFor(@Nonnull String categoryId) {
-		final Bundle result = new Bundle(1);
-		putCategory(result, categoryId);
-		return result;
-	}
-
-	static void putCategory(@Nonnull Bundle bundle, @Nonnull String categoryId) {
-		bundle.putString(MATH_ENTITY_CATEGORY_EXTRA_STRING, categoryId);
-	}
-
-	@Override
-	public void onCalculatorEvent(@Nonnull CalculatorEventData calculatorEventData, @Nonnull CalculatorEventType calculatorEventType, @Nullable Object data) {
-	}
 }

android-app/src/main/java/org/solovyev/android/calculator/math/edit/CalculatorFunctionsActivity.java

@@ -25,7 +25,15 @@ package org.solovyev.android.calculator.math.edit;
 import android.content.Intent;
 import android.os.Bundle;
 import android.util.Log;
-import org.solovyev.android.calculator.*;
+
+import org.solovyev.android.calculator.AndroidFunctionCategory;
+import org.solovyev.android.calculator.BaseActivity;
+import org.solovyev.android.calculator.CalculatorEventData;
+import org.solovyev.android.calculator.CalculatorEventListener;
+import org.solovyev.android.calculator.CalculatorEventType;
+import org.solovyev.android.calculator.CalculatorFragmentType;
+import org.solovyev.android.calculator.FunctionCategory;
+import org.solovyev.android.calculator.R;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;

android-app/src/main/java/org/solovyev/android/calculator/math/edit/CalculatorFunctionsFragment.java

@@ -30,21 +30,31 @@ import android.support.v7.app.ActionBarActivity;
 import android.text.ClipboardManager;
 import android.view.View;
 import android.widget.ListView;
+
 import com.melnykov.fab.FloatingActionButton;
-import jscl.math.function.Function;
+
-import jscl.math.function.IFunction;
+import org.solovyev.android.calculator.CalculatorEventData;
-import org.solovyev.android.calculator.*;
+import org.solovyev.android.calculator.CalculatorEventType;
+import org.solovyev.android.calculator.CalculatorFragmentType;
+import org.solovyev.android.calculator.CalculatorMathRegistry;
+import org.solovyev.android.calculator.Change;
+import org.solovyev.android.calculator.Locator;
+import org.solovyev.android.calculator.R;
 import org.solovyev.android.calculator.function.FunctionEditDialogFragment;
 import org.solovyev.android.menu.AMenuItem;
 import org.solovyev.android.menu.LabeledMenuItem;
 import org.solovyev.common.text.Strings;
 
-import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+import jscl.math.function.Function;
+import jscl.math.function.IFunction;
+
 /**
  * User: serso
  * Date: 10/29/11

android-app/src/main/java/org/solovyev/android/calculator/math/edit/CalculatorOperatorsActivity.java

@@ -23,7 +23,15 @@
 package org.solovyev.android.calculator.math.edit;
 
 import android.os.Bundle;
-import org.solovyev.android.calculator.*;
+
+import org.solovyev.android.calculator.AndroidOperatorCategory;
+import org.solovyev.android.calculator.BaseActivity;
+import org.solovyev.android.calculator.CalculatorEventData;
+import org.solovyev.android.calculator.CalculatorEventListener;
+import org.solovyev.android.calculator.CalculatorEventType;
+import org.solovyev.android.calculator.CalculatorFragmentType;
+import org.solovyev.android.calculator.OperatorCategory;
+import org.solovyev.android.calculator.R;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;

android-app/src/main/java/org/solovyev/android/calculator/math/edit/CalculatorOperatorsFragment.java

@@ -25,9 +25,6 @@ package org.solovyev.android.calculator.math.edit;
 import android.app.Activity;
 import android.content.Context;
 import android.text.ClipboardManager;
-import jscl.math.operator.Operator;
-
-import javax.annotation.Nonnull;
 
 import org.solovyev.android.calculator.CalculatorEventType;
 import org.solovyev.android.calculator.CalculatorFragmentType;
@@ -41,6 +38,10 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
+import javax.annotation.Nonnull;
+
+import jscl.math.operator.Operator;
+
 /**
  * User: serso
  * Date: 11/17/11

android-app/src/main/java/org/solovyev/android/calculator/math/edit/CalculatorVarsActivity.java

@@ -24,7 +24,15 @@ package org.solovyev.android.calculator.math.edit;
 
 import android.content.Intent;
 import android.os.Bundle;
-import org.solovyev.android.calculator.*;
+
+import org.solovyev.android.calculator.AndroidVarCategory;
+import org.solovyev.android.calculator.BaseActivity;
+import org.solovyev.android.calculator.CalculatorEventData;
+import org.solovyev.android.calculator.CalculatorEventListener;
+import org.solovyev.android.calculator.CalculatorEventType;
+import org.solovyev.android.calculator.CalculatorFragmentType;
+import org.solovyev.android.calculator.R;
+import org.solovyev.android.calculator.VarCategory;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;

android-app/src/main/java/org/solovyev/android/calculator/math/edit/CalculatorVarsFragment.java

@@ -27,9 +27,18 @@ import android.os.Bundle;
 import android.support.v7.app.ActionBarActivity;
 import android.view.View;
 import android.widget.ListView;
+
 import com.melnykov.fab.FloatingActionButton;
-import jscl.math.function.IConstant;
+
-import org.solovyev.android.calculator.*;
+import org.solovyev.android.calculator.CalculatorEventData;
+import org.solovyev.android.calculator.CalculatorEventType;
+import org.solovyev.android.calculator.CalculatorFragmentType;
+import org.solovyev.android.calculator.CalculatorParseException;
+import org.solovyev.android.calculator.Change;
+import org.solovyev.android.calculator.Locator;
+import org.solovyev.android.calculator.PreparedExpression;
+import org.solovyev.android.calculator.R;
+import org.solovyev.android.calculator.ToJsclTextProcessor;
 import org.solovyev.android.calculator.math.MathType;
 import org.solovyev.android.menu.AMenuItem;
 import org.solovyev.android.menu.LabeledMenuItem;
@@ -37,12 +46,15 @@ import org.solovyev.common.JPredicate;
 import org.solovyev.common.collections.Collections;
 import org.solovyev.common.text.Strings;
 
-import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+import jscl.math.function.IConstant;
+
 /**
  * User: serso
  * Date: 9/28/11
@@ -56,6 +68,18 @@ public class CalculatorVarsFragment extends AbstractMathEntityListFragment<ICons
         super(CalculatorFragmentType.variables);
     }
 
+    public static boolean isValidValue(@Nonnull String value) {
+        try {
+            final PreparedExpression expression = ToJsclTextProcessor.getInstance().process(value);
+            final List<IConstant> constants = expression.getUndefinedVars();
+            return constants.isEmpty();
+        } catch (RuntimeException e) {
+            return true;
+        } catch (CalculatorParseException e) {
+            return true;
+        }
+    }
+
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -147,18 +171,6 @@ public class CalculatorVarsFragment extends AbstractMathEntityListFragment<ICons
         return Locator.getInstance().getEngine().getVarsRegistry().getCategory(var);
     }
 
-	public static boolean isValidValue(@Nonnull String value) {
-		try {
-			final PreparedExpression expression = ToJsclTextProcessor.getInstance().process(value);
-			final List<IConstant> constants = expression.getUndefinedVars();
-			return constants.isEmpty();
-		} catch (RuntimeException e) {
-			return true;
-		} catch (CalculatorParseException e) {
-			return true;
-		}
-	}
-
     @Override
     public void onCalculatorEvent(@Nonnull CalculatorEventData calculatorEventData, @Nonnull CalculatorEventType calculatorEventType, @Nullable Object data) {
         super.onCalculatorEvent(calculatorEventData, calculatorEventType, data);

android-app/src/main/java/org/solovyev/android/calculator/math/edit/MathEntityRemover.java

@@ -27,11 +27,6 @@ import android.content.Context;
 import android.content.DialogInterface;
 import android.view.View;
 import android.widget.TextView;
-import jscl.math.function.Function;
-import jscl.math.function.IConstant;
-
-import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
 
 import org.solovyev.android.calculator.CalculatorEventType;
 import org.solovyev.android.calculator.CalculatorMathRegistry;
@@ -39,6 +34,12 @@ import org.solovyev.android.calculator.Locator;
 import org.solovyev.android.calculator.R;
 import org.solovyev.common.math.MathEntity;
 
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+import jscl.math.function.Function;
+import jscl.math.function.IConstant;
+
 /**
  * User: serso
  * Date: 12/22/11
@@ -56,15 +57,12 @@ public class MathEntityRemover<T extends MathEntity> implements View.OnClickList
 
     @Nonnull
     private final CalculatorMathRegistry<? super T> varsRegistry;
-
-	@Nonnull
-	private Context context;
-
     @Nonnull
     private final Object source;
-
     @Nonnull
     private final Params params;
+    @Nonnull
+    private Context context;
 
 	/*
     **********************************************************************
@@ -163,18 +161,6 @@ public class MathEntityRemover<T extends MathEntity> implements View.OnClickList
         private Params() {
         }
 
-		public int getRemovalConfirmationTitleResId() {
-			return removalConfirmationTitleResId;
-		}
-
-		public int getRemovalConfirmationQuestionResId() {
-			return removalConfirmationQuestionResId;
-		}
-
-		public CalculatorEventType getCalculatorEventType() {
-			return calculatorEventType;
-		}
-
         private static <T extends MathEntity> Params newConstantInstance() {
             final Params result = new Params();
             result.removalConfirmationTitleResId = R.string.removal_confirmation;
@@ -190,5 +176,17 @@ public class MathEntityRemover<T extends MathEntity> implements View.OnClickList
             result.calculatorEventType = CalculatorEventType.function_removed;
             return result;
         }
+
+        public int getRemovalConfirmationTitleResId() {
+            return removalConfirmationTitleResId;
+        }
+
+        public int getRemovalConfirmationQuestionResId() {
+            return removalConfirmationQuestionResId;
+        }
+
+        public CalculatorEventType getCalculatorEventType() {
+            return calculatorEventType;
+        }
     }
 }

android-app/src/main/java/org/solovyev/android/calculator/math/edit/VarEditDialogFragment.java

@@ -32,19 +32,31 @@ import android.text.TextWatcher;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
-import android.widget.*;
+import android.widget.Button;
-import jscl.math.function.IConstant;
+import android.widget.EditText;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+import android.widget.Toast;
+
 import org.solovyev.android.Views;
-import org.solovyev.android.calculator.*;
+import org.solovyev.android.calculator.App;
+import org.solovyev.android.calculator.CalculatorEventData;
+import org.solovyev.android.calculator.CalculatorEventListener;
+import org.solovyev.android.calculator.CalculatorEventType;
+import org.solovyev.android.calculator.Locator;
+import org.solovyev.android.calculator.R;
 import org.solovyev.android.calculator.model.Var;
 import org.solovyev.common.text.Strings;
 
-import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
 import java.util.Arrays;
 import java.util.List;
 import java.util.Locale;
 
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+import jscl.math.function.IConstant;
+
 import static android.graphics.Paint.UNDERLINE_TEXT_FLAG;
 import static android.view.View.GONE;
 import static android.view.View.VISIBLE;
@@ -71,6 +83,10 @@ public class VarEditDialogFragment extends DialogFragment implements CalculatorE
         return fragment;
     }
 
+    public static void showDialog(@Nonnull Input input, @Nonnull FragmentManager fm) {
+        App.showDialog(create(input), "constant-editor", fm);
+    }
+
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
         return inflater.inflate(R.layout.var_edit, container, false);
@@ -233,6 +249,14 @@ public class VarEditDialogFragment extends DialogFragment implements CalculatorE
         button.setAllCaps(false);
     }
 
+	/*
+    **********************************************************************
+	*
+	*                           STATIC
+	*
+	**********************************************************************
+	*/
+
     @Override
     public void onCalculatorEvent(@Nonnull CalculatorEventData calculatorEventData, @Nonnull CalculatorEventType calculatorEventType, @Nullable Object data) {
         switch (calculatorEventType) {
@@ -247,18 +271,6 @@ public class VarEditDialogFragment extends DialogFragment implements CalculatorE
         }
     }
 
-	/*
-	**********************************************************************
-	*
-	*                           STATIC
-	*
-	**********************************************************************
-	*/
-
-	public static void showDialog(@Nonnull Input input, @Nonnull FragmentManager fm) {
-		App.showDialog(create(input), "constant-editor", fm);
-	}
-
     public static class Input {
 
         @Nullable

android-app/src/main/java/org/solovyev/android/calculator/math/edit/VarEditorSaver.java

@@ -24,10 +24,7 @@ package org.solovyev.android.calculator.math.edit;
 
 import android.view.View;
 import android.widget.EditText;
-import jscl.text.Identifier;
+
-import jscl.text.MutableInt;
-import jscl.text.ParseException;
-import jscl.text.Parser;
 import org.solovyev.android.calculator.CalculatorMathRegistry;
 import org.solovyev.android.calculator.CalculatorVarsRegistry;
 import org.solovyev.android.calculator.Locator;
@@ -41,6 +38,11 @@ import org.solovyev.common.text.Strings;
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 
+import jscl.text.Identifier;
+import jscl.text.MutableInt;
+import jscl.text.ParseException;
+import jscl.text.Parser;
+
 /**
  * User: serso
  * Date: 12/22/11
@@ -75,6 +77,22 @@ public class VarEditorSaver<T extends MathEntity> implements View.OnClickListene
         this.source = source;
     }
 
+    public static boolean isValidName(@Nullable String name) {
+        boolean result = false;
+
+        if (!Strings.isEmpty(name)) {
+            try {
+                if (name == null) throw new AssertionError();
+                Identifier.parser.parse(Parser.Parameters.newInstance(name, new MutableInt(0), Locator.getInstance().getEngine().getMathEngine0()), null);
+                result = true;
+            } catch (ParseException e) {
+                // not valid name;
+            }
+        }
+
+        return result;
+    }
+
     @Override
     public void onClick(View v) {
         final Integer error;
@@ -139,20 +157,4 @@ public class VarEditorSaver<T extends MathEntity> implements View.OnClickListene
             CalculatorVarsRegistry.saveVariable(mathRegistry, varBuilder, editedInstance, source, true);
         }
     }
-
-	public static boolean isValidName(@Nullable String name) {
-		boolean result = false;
-
-		if (!Strings.isEmpty(name)) {
-			try {
-				if (name == null) throw new AssertionError();
-				Identifier.parser.parse(Parser.Parameters.newInstance(name, new MutableInt(0), Locator.getInstance().getEngine().getMathEngine0()), null);
-				result = true;
-			} catch (ParseException e) {
-				// not valid name;
-			}
-		}
-
-		return result;
-	}
 }

android-app/src/main/java/org/solovyev/android/calculator/matrix/CalculatorMatrixActivity.java

@@ -24,8 +24,8 @@ package org.solovyev.android.calculator.matrix;
 
 import android.os.Bundle;
 
-import org.solovyev.android.calculator.EmptyActivity;
 import org.solovyev.android.calculator.CalculatorFragmentType;
+import org.solovyev.android.calculator.EmptyActivity;
 import org.solovyev.android.calculator.R;
 
 import static android.support.v7.app.ActionBar.NAVIGATION_MODE_STANDARD;

android-app/src/main/java/org/solovyev/android/calculator/matrix/CalculatorMatrixEditFragment.java

@@ -24,6 +24,7 @@ package org.solovyev.android.calculator.matrix;
 
 import android.os.Bundle;
 import android.view.View;
+
 import org.solovyev.android.calculator.CalculatorFragment;
 import org.solovyev.android.calculator.CalculatorFragmentType;
 import org.solovyev.android.calculator.R;

android-app/src/main/java/org/solovyev/android/calculator/matrix/MatrixUi.java

@@ -1,13 +1,14 @@
 package org.solovyev.android.calculator.matrix;
 
-import javax.annotation.Nonnull;
 import java.io.Serializable;
 
+import javax.annotation.Nonnull;
+
 /**
-* User: serso
+ * User: serso
-* Date: 7/11/13
+ * Date: 7/11/13
-* Time: 4:54 PM
+ * Time: 4:54 PM
-*/
+ */
 class MatrixUi implements Serializable {
 
     @Nonnull

android-app/src/main/java/org/solovyev/android/calculator/model/AndroidCalculatorEngine.java

@@ -26,18 +26,16 @@ import android.app.Application;
 import android.content.Context;
 import android.content.SharedPreferences;
 import android.preference.PreferenceManager;
-import jscl.AngleUnit;
-import jscl.JsclMathEngine;
-import jscl.MathEngine;
-import jscl.NumeralBase;
-import jscl.math.function.Function;
-import jscl.math.function.IConstant;
-import jscl.math.operator.Operator;
 
-import javax.annotation.Nonnull;
+import org.solovyev.android.calculator.CalculatorEngine;
-
+import org.solovyev.android.calculator.CalculatorEngineImpl;
-import org.solovyev.android.calculator.*;
+import org.solovyev.android.calculator.CalculatorFunctionsMathRegistry;
-import org.solovyev.android.calculator.R;
+import org.solovyev.android.calculator.CalculatorMathEngine;
+import org.solovyev.android.calculator.CalculatorMathRegistry;
+import org.solovyev.android.calculator.CalculatorOperatorsMathRegistry;
+import org.solovyev.android.calculator.CalculatorPostfixFunctionsRegistry;
+import org.solovyev.android.calculator.CalculatorVarsRegistry;
+import org.solovyev.android.calculator.MathPersistenceEntity;
 import org.solovyev.android.prefs.BooleanPreference;
 import org.solovyev.android.prefs.Preference;
 import org.solovyev.android.prefs.StringPreference;
@@ -50,6 +48,16 @@ import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 
+import javax.annotation.Nonnull;
+
+import jscl.AngleUnit;
+import jscl.JsclMathEngine;
+import jscl.MathEngine;
+import jscl.NumeralBase;
+import jscl.math.function.Function;
+import jscl.math.function.IConstant;
+import jscl.math.operator.Operator;
+
 /**
  * User: serso
  * Date: 9/12/11
@@ -80,42 +88,10 @@ public class AndroidCalculatorEngine implements CalculatorEngine, SharedPreferen
 
     private static final String ANGLE_UNITS_P_KEY = "org.solovyev.android.calculator.CalculatorActivity_angle_units";
     private static final String ANGLE_UNITS_DEFAULT = "deg";
-
-	public static class Preferences {
-		public static final Preference<String> groupingSeparator = StringPreference.of(GROUPING_SEPARATOR_P_KEY, JsclMathEngine.GROUPING_SEPARATOR_DEFAULT);
-		public static final Preference<String> multiplicationSign = StringPreference.of(MULTIPLICATION_SIGN_P_KEY, MULTIPLICATION_SIGN_DEFAULT);
-		public static final Preference<Integer> precision = StringPreference.ofTypedValue(RESULT_PRECISION_P_KEY, RESULT_PRECISION_DEFAULT, NumberMapper.of(Integer.class));
-		public static final Preference<Boolean> roundResult = BooleanPreference.of(ROUND_RESULT_P_KEY, ROUND_RESULT_DEFAULT);
-		public static final Preference<NumeralBase> numeralBase = StringPreference.ofTypedValue(NUMERAL_BASES_P_KEY, NUMERAL_BASES_DEFAULT, EnumMapper.of(NumeralBase.class));
-		public static final Preference<AngleUnit> angleUnit = StringPreference.ofTypedValue(ANGLE_UNITS_P_KEY, ANGLE_UNITS_DEFAULT, EnumMapper.of(AngleUnit.class));
-		public static final Preference<Boolean> scienceNotation = BooleanPreference.of(SCIENCE_NOTATION_P_KEY, SCIENCE_NOTATION_DEFAULT);
-		public static final Preference<Integer> maxCalculationTime = StringPreference.ofTypedValue(MAX_CALCULATION_TIME_P_KEY, MAX_CALCULATION_TIME_DEFAULT, NumberMapper.of(Integer.class));
-
-		private static final List<String> preferenceKeys = new ArrayList<String>();
-
-		static {
-			preferenceKeys.add(groupingSeparator.getKey());
-			preferenceKeys.add(multiplicationSign.getKey());
-			preferenceKeys.add(precision.getKey());
-			preferenceKeys.add(roundResult.getKey());
-			preferenceKeys.add(numeralBase.getKey());
-			preferenceKeys.add(angleUnit.getKey());
-			preferenceKeys.add(scienceNotation.getKey());
-			preferenceKeys.add(maxCalculationTime.getKey());
-		}
-
-		@Nonnull
-		public static List<String> getPreferenceKeys() {
-			return Collections.unmodifiableList(preferenceKeys);
-		}
-	}
-
     @Nonnull
     private final Context context;
-
     @Nonnull
     private final CalculatorEngine calculatorEngine;
-
     @Nonnull
     private final Object lock;
 
@@ -135,6 +111,16 @@ public class AndroidCalculatorEngine implements CalculatorEngine, SharedPreferen
                 this.lock);
     }
 
+    @Nonnull
+    public static NumeralBase getNumeralBaseFromPrefs(@Nonnull SharedPreferences preferences) {
+        return Preferences.numeralBase.getPreference(preferences);
+    }
+
+    @Nonnull
+    public static AngleUnit getAngleUnitsFromPrefs(@Nonnull SharedPreferences preferences) {
+        return Preferences.angleUnit.getPreference(preferences);
+    }
+
     @Override
     @Nonnull
     public CalculatorMathRegistry<IConstant> getVarsRegistry() {
@@ -177,6 +163,11 @@ public class AndroidCalculatorEngine implements CalculatorEngine, SharedPreferen
         return calculatorEngine.getNumeralBase();
     }
 
+    @Override
+    public void setNumeralBase(@Nonnull NumeralBase numeralBase) {
+        calculatorEngine.setNumeralBase(numeralBase);
+    }
+
     @Override
     public void init() {
         synchronized (lock) {
@@ -235,16 +226,6 @@ public class AndroidCalculatorEngine implements CalculatorEngine, SharedPreferen
         calculatorEngine.setAngleUnits(angleUnits);
     }
 
-	@Override
-	public void setNumeralBase(@Nonnull NumeralBase numeralBase) {
-		calculatorEngine.setNumeralBase(numeralBase);
-	}
-
-	@Override
-	public void setMultiplicationSign(@Nonnull String multiplicationSign) {
-		calculatorEngine.setMultiplicationSign(multiplicationSign);
-	}
-
     @Override
     public void setScienceNotation(@Nonnull Boolean scienceNotation) {
         calculatorEngine.setScienceNotation(scienceNotation);
@@ -273,16 +254,6 @@ public class AndroidCalculatorEngine implements CalculatorEngine, SharedPreferen
         }
     }
 
-	@Nonnull
-	public static NumeralBase getNumeralBaseFromPrefs(@Nonnull SharedPreferences preferences) {
-		return Preferences.numeralBase.getPreference(preferences);
-	}
-
-	@Nonnull
-	public static AngleUnit getAngleUnitsFromPrefs(@Nonnull SharedPreferences preferences) {
-		return Preferences.angleUnit.getPreference(preferences);
-	}
-
     //for tests only
     public void setDecimalGroupSymbols(@Nonnull DecimalFormatSymbols decimalGroupSymbols) {
         this.calculatorEngine.setDecimalGroupSymbols(decimalGroupSymbols);
@@ -294,6 +265,10 @@ public class AndroidCalculatorEngine implements CalculatorEngine, SharedPreferen
         return calculatorEngine.getMultiplicationSign();
     }
 
+    @Override
+    public void setMultiplicationSign(@Nonnull String multiplicationSign) {
+        calculatorEngine.setMultiplicationSign(multiplicationSign);
+    }
 
     @Override
     public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
@@ -302,4 +277,33 @@ public class AndroidCalculatorEngine implements CalculatorEngine, SharedPreferen
         }
     }
 
+    public static class Preferences {
+        public static final Preference<String> groupingSeparator = StringPreference.of(GROUPING_SEPARATOR_P_KEY, JsclMathEngine.GROUPING_SEPARATOR_DEFAULT);
+        public static final Preference<String> multiplicationSign = StringPreference.of(MULTIPLICATION_SIGN_P_KEY, MULTIPLICATION_SIGN_DEFAULT);
+        public static final Preference<Integer> precision = StringPreference.ofTypedValue(RESULT_PRECISION_P_KEY, RESULT_PRECISION_DEFAULT, NumberMapper.of(Integer.class));
+        public static final Preference<Boolean> roundResult = BooleanPreference.of(ROUND_RESULT_P_KEY, ROUND_RESULT_DEFAULT);
+        public static final Preference<NumeralBase> numeralBase = StringPreference.ofTypedValue(NUMERAL_BASES_P_KEY, NUMERAL_BASES_DEFAULT, EnumMapper.of(NumeralBase.class));
+        public static final Preference<AngleUnit> angleUnit = StringPreference.ofTypedValue(ANGLE_UNITS_P_KEY, ANGLE_UNITS_DEFAULT, EnumMapper.of(AngleUnit.class));
+        public static final Preference<Boolean> scienceNotation = BooleanPreference.of(SCIENCE_NOTATION_P_KEY, SCIENCE_NOTATION_DEFAULT);
+        public static final Preference<Integer> maxCalculationTime = StringPreference.ofTypedValue(MAX_CALCULATION_TIME_P_KEY, MAX_CALCULATION_TIME_DEFAULT, NumberMapper.of(Integer.class));
+
+        private static final List<String> preferenceKeys = new ArrayList<String>();
+
+        static {
+            preferenceKeys.add(groupingSeparator.getKey());
+            preferenceKeys.add(multiplicationSign.getKey());
+            preferenceKeys.add(precision.getKey());
+            preferenceKeys.add(roundResult.getKey());
+            preferenceKeys.add(numeralBase.getKey());
+            preferenceKeys.add(angleUnit.getKey());
+            preferenceKeys.add(scienceNotation.getKey());
+            preferenceKeys.add(maxCalculationTime.getKey());
+        }
+
+        @Nonnull
+        public static List<String> getPreferenceKeys() {
+            return Collections.unmodifiableList(preferenceKeys);
+        }
+    }
+
 }

android-app/src/main/java/org/solovyev/android/calculator/model/AndroidMathEntityDao.java

@@ -27,6 +27,7 @@ import android.content.Context;
 import android.content.SharedPreferences;
 import android.content.res.Resources;
 import android.preference.PreferenceManager;
+
 import org.simpleframework.xml.Serializer;
 import org.simpleframework.xml.core.Persister;
 import org.solovyev.android.calculator.CalculatorApplication;
@@ -34,9 +35,10 @@ import org.solovyev.android.calculator.MathEntityDao;
 import org.solovyev.android.calculator.MathEntityPersistenceContainer;
 import org.solovyev.android.calculator.MathPersistenceEntity;
 
+import java.io.StringWriter;
+
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
-import java.io.StringWriter;
 
 /**
  * User: serso

android-app/src/main/java/org/solovyev/android/calculator/onscreen/CalculatorOnscreenService.java

@@ -54,13 +54,10 @@ import javax.annotation.Nullable;
  */
 public class CalculatorOnscreenService extends Service implements OnscreenViewListener, CalculatorEventListener, SharedPreferences.OnSharedPreferenceChangeListener {
 
+    public static final Class<CalculatorOnscreenBroadcastReceiver> INTENT_LISTENER_CLASS = CalculatorOnscreenBroadcastReceiver.class;
     private static final String SHOW_WINDOW_ACTION = "org.solovyev.android.calculator.onscreen.SHOW_WINDOW";
     private static final String SHOW_NOTIFICATION_ACTION = "org.solovyev.android.calculator.onscreen.SHOW_NOTIFICATION";
-
     private static final int NOTIFICATION_ID = 9031988; // my birthday =)
-
-	public static final Class<CalculatorOnscreenBroadcastReceiver> INTENT_LISTENER_CLASS = CalculatorOnscreenBroadcastReceiver.class;
-
     @Nonnull
     private CalculatorOnscreenView view;
 
@@ -68,6 +65,29 @@ public class CalculatorOnscreenService extends Service implements OnscreenViewLi
 
     private boolean viewCreated = false;
 
+    @Nonnull
+    private static Class<?> getIntentListenerClass() {
+        return INTENT_LISTENER_CLASS;
+    }
+
+    public static void showNotification(@Nonnull Context context) {
+        final Intent intent = new Intent(SHOW_NOTIFICATION_ACTION);
+        intent.setClass(context, getIntentListenerClass());
+        context.sendBroadcast(intent);
+    }
+
+    public static void showOnscreenView(@Nonnull Context context) {
+        final Intent intent = createShowWindowIntent(context);
+        context.sendBroadcast(intent);
+    }
+
+    @Nonnull
+    private static Intent createShowWindowIntent(@Nonnull Context context) {
+        final Intent intent = new Intent(SHOW_WINDOW_ACTION);
+        intent.setClass(context, getIntentListenerClass());
+        return intent;
+    }
+
     @Override
     public IBinder onBind(Intent intent) {
         return null;
@@ -117,11 +137,6 @@ public class CalculatorOnscreenService extends Service implements OnscreenViewLi
         Locator.getInstance().getCalculator().addCalculatorEventListener(this);
     }
 
-	@Nonnull
-	private static Class<?> getIntentListenerClass() {
-		return INTENT_LISTENER_CLASS;
-	}
-
     private void stopCalculatorListening() {
         Locator.getInstance().getCalculator().removeCalculatorEventListener(this);
     }
@@ -211,24 +226,6 @@ public class CalculatorOnscreenService extends Service implements OnscreenViewLi
         nm.notify(NOTIFICATION_ID, builder.getNotification());
     }
 
-	public static void showNotification(@Nonnull Context context) {
-		final Intent intent = new Intent(SHOW_NOTIFICATION_ACTION);
-		intent.setClass(context, getIntentListenerClass());
-		context.sendBroadcast(intent);
-	}
-
-	public static void showOnscreenView(@Nonnull Context context) {
-		final Intent intent = createShowWindowIntent(context);
-		context.sendBroadcast(intent);
-	}
-
-	@Nonnull
-	private static Intent createShowWindowIntent(@Nonnull Context context) {
-		final Intent intent = new Intent(SHOW_WINDOW_ACTION);
-		intent.setClass(context, getIntentListenerClass());
-		return intent;
-	}
-
     @Override
     public void onCalculatorEvent(@Nonnull CalculatorEventData calculatorEventData, @Nonnull CalculatorEventType calculatorEventType, @Nullable Object data) {
         switch (calculatorEventType) {

android-app/src/main/java/org/solovyev/android/calculator/onscreen/CalculatorOnscreenView.java

@@ -174,11 +174,34 @@ public class CalculatorOnscreenView {
 	**********************************************************************
 	*/
 
+    public static void persistState(@Nonnull Context context, @Nonnull CalculatorOnscreenViewState state) {
+        final SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
+        viewStatePreference.putPreference(preferences, state);
+    }
+
+    @Nullable
+    public static CalculatorOnscreenViewState readState(@Nonnull Context context) {
+        final SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
+        if (viewStatePreference.isSet(preferences)) {
+            return viewStatePreference.getPreference(preferences);
+        } else {
+            return null;
+        }
+    }
+
     public void updateDisplayState(@Nonnull CalculatorDisplayViewState displayState) {
         checkInit();
         displayView.setState(displayState);
     }
 
+	/*
+	**********************************************************************
+	*
+	*                           LIFECYCLE
+	*
+	**********************************************************************
+	*/
+
     public void updateEditorState(@Nonnull CalculatorEditorViewState editorState) {
         checkInit();
         editorView.setState(editorState);
@@ -194,14 +217,6 @@ public class CalculatorOnscreenView {
         getWindowManager().updateViewLayout(root, params);
     }
 
-	/*
-	**********************************************************************
-	*
-	*                           LIFECYCLE
-	*
-	**********************************************************************
-	*/
-
     private void init() {
 
         if (!initialized) {
@@ -358,21 +373,6 @@ public class CalculatorOnscreenView {
         }
     }
 
-	public static void persistState(@Nonnull Context context, @Nonnull CalculatorOnscreenViewState state) {
-		final SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
-		viewStatePreference.putPreference(preferences, state);
-	}
-
-	@Nullable
-	public static CalculatorOnscreenViewState readState(@Nonnull Context context) {
-		final SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
-		if (viewStatePreference.isSet(preferences)) {
-			return viewStatePreference.getPreference(preferences);
-		} else {
-			return null;
-		}
-	}
-
     public void hide() {
         checkInit();
 
@@ -437,18 +437,12 @@ public class CalculatorOnscreenView {
 
         @Nonnull
         private final WindowManager wm;
-
-		private int orientation;
-
-		private float x0;
-
-		private float y0;
-
-		private long time = 0;
-
         @Nonnull
         private final View view;
-
+        private int orientation;
+        private float x0;
+        private float y0;
+        private long time = 0;
         private int displayWidth;
 
         private int displayHeight;
@@ -468,6 +462,19 @@ public class CalculatorOnscreenView {
             initDisplayParams();
         }
 
+        @Nonnull
+        private static String toString(float x, float y) {
+            return "(" + formatFloat(x) + ", " + formatFloat(y) + ")";
+        }
+
+        private static String formatFloat(float value) {
+            if (value >= 0) {
+                return "+" + String.format("%.2f", value);
+            } else {
+                return String.format(Locale.ENGLISH, "%.2f", value);
+            }
+        }
+
         @Override
         public boolean onTouch(View v, MotionEvent event) {
             if (orientation != this.wm.getDefaultDisplay().getOrientation()) {
@@ -548,18 +555,5 @@ public class CalculatorOnscreenView {
             δx = Math.abs(δx);
             return δx >= DIST_EPS && δx < DIST_MAX;
         }
-
-		@Nonnull
-		private static String toString(float x, float y) {
-			return "(" + formatFloat(x) + ", " + formatFloat(y) + ")";
-		}
-
-		private static String formatFloat(float value) {
-			if (value >= 0) {
-				return "+" + String.format("%.2f", value);
-			} else {
-				return String.format(Locale.ENGLISH, "%.2f", value);
-			}
-		}
     }
 }

android-app/src/main/java/org/solovyev/android/calculator/onscreen/CalculatorOnscreenViewState.java

@@ -45,7 +45,10 @@ import javax.annotation.Nullable;
 public class CalculatorOnscreenViewState implements Parcelable {
 
     private static final String TAG = CalculatorOnscreenViewState.class.getSimpleName();
-
+    private int width;
+    private int height;
+    private int x;
+    private int y;
     public static final Parcelable.Creator<CalculatorOnscreenViewState> CREATOR = new Parcelable.Creator<CalculatorOnscreenViewState>() {
         public CalculatorOnscreenViewState createFromParcel(@Nonnull Parcel in) {
             return CalculatorOnscreenViewState.fromParcel(in);
@@ -56,14 +59,6 @@ public class CalculatorOnscreenViewState implements Parcelable {
         }
     };
 
-	private int width;
-
-	private int height;
-
-	private int x;
-
-	private int y;
-
     private CalculatorOnscreenViewState() {
     }