Merge remote-tracking branch 'origin/master'

Conflicts: android-app-core/res/values-ru/text_about.xml android-app-core/res/values-ru/text_wizard.xml android-app-core/res/values/text_about.xml android-app-core/res/values/text_wizard.xml pom.xml
2013-07-03 00:08:50 +04:00
parent 572f151d24 e53d72fc04
commit c772a4e429
33 changed files with 568 additions and 100 deletions
--- a/android-app-core/res/drawable-hdpi/kb_facebook.png
+++ b/android-app-core/res/drawable-hdpi/kb_facebook.png
--- a/android-app-core/res/drawable-ldpi/kb_facebook.png
+++ b/android-app-core/res/drawable-ldpi/kb_facebook.png
--- a/android-app-core/res/drawable-mdpi/kb_facebook.png
+++ b/android-app-core/res/drawable-mdpi/kb_facebook.png
--- a/android-app-core/res/drawable-xhdpi/kb_facebook.png
+++ b/android-app-core/res/drawable-xhdpi/kb_facebook.png
--- a/android-app-core/res/drawable-xlarge-hdpi/kb_facebook.png
+++ b/android-app-core/res/drawable-xlarge-hdpi/kb_facebook.png
--- a/android-app-core/res/layout/cpp_simple_button_like.xml
+++ b/android-app-core/res/layout/cpp_simple_button_like.xml
@@ -24,6 +24,6 @@

 <ImageButton xmlns:a="http://schemas.android.com/apk/res/android"
 			 a:id="@id/cpp_button_like"
-			 a:src="@drawable/kb_facebook"
+			 a:src="@drawable/kb_share"
 			 style="@style/cpp_simple_metro_control_image_button_style"
 			 a:contentDescription="Like"/>
--- a/android-app-core/res/layout/cpp_simple_button_operators.xml
+++ b/android-app-core/res/layout/cpp_simple_button_operators.xml
@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<!--
+  ~ Copyright 2013 serso aka se.solovyev
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~    http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  ~
+  ~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+  ~ Contact details
+  ~
+  ~ Email: se.solovyev@gmail.com
+  ~ Site:  http://se.solovyev.org
+  -->
+
+<Button xmlns:a="http://schemas.android.com/apk/res/android"
+		a:id="@id/cpp_button_operators"
+		a:text="∂,…"
+		a:textStyle="italic"
+		style="@style/cpp_simple_metro_control_button_style"/>
--- a/android-app-core/res/layout/cpp_simple_keyboard.xml
+++ b/android-app-core/res/layout/cpp_simple_keyboard.xml
@@ -78,7 +78,7 @@

 		<include layout="@layout/cpp_simple_button_plus"/>

-		<include layout="@layout/cpp_simple_button_like"/>
+		<include layout="@layout/cpp_simple_button_settings"/>

 		<include layout="@layout/cpp_simple_button_copy"/>

@@ -97,7 +97,7 @@

 		<include layout="@layout/cpp_simple_button_subtraction"/>

-		<include layout="@layout/cpp_simple_button_settings"/>
+		<include layout="@layout/cpp_simple_button_app"/>

 		<include layout="@layout/cpp_simple_button_paste"/>

@@ -117,7 +117,7 @@

 		<include layout="@layout/cpp_simple_button_functions"/>

-		<include layout="@layout/cpp_simple_button_app"/>
+		<include layout="@layout/cpp_simple_button_operators"/>

 		<include layout="@layout/cpp_simple_button_history"/>

--- a/android-app-core/res/values-ru/text_about.xml
+++ b/android-app-core/res/values-ru/text_about.xml
@@ -21,20 +21,25 @@
  -->

 <resources>
+
 	<string name="c_about">О программе</string>
-  <string name="c_about_content">Копирайт © 2009–2013\n\n<b>Создано serso aka se.solovyev</b>\n\n
-Страница на Facebook:<a href="http://facebook.com/calculatorpp">http://facebook.com/calculatorpp</a>\n\n
-Эта программа распространяется под соглашением Apache 2.0 :\nисходный код может быть найден на\n
-<a href="https://github.com/serso/android-calculatorpp">http://github.com</a>\n\n
- Для получения большей информации\nсвяжитесь с автором по email\n
-<a href="mailto:se.solovyev@gmail.com">se.solovyev@gmail.com</a>
-\nor visit\n<a href="http://se.solovyev.org">http://se.solovyev.org</a>\n\n
- Если вы хотите поддержать проект\n\nвы можете купить специальную опцию из настроек приложения\n\n
- Если вам нравится приложение\nоценить его на 5 звёзд в\n
-<a href="https://market.android.com/details?id=org.solovyev.android.calculator">Google Play</a>\n\n
- Это приложение использует открытые библиотеки:\n
-<a href="http://simple.sourceforge.net">Simple (XML serialization)</a>\n
-<a href="http://meditorworld.appspot.com/meditor.txt">JSCL</a></string>
+
+	<string name="c_about_content">Copyright (c) 2009-2013\n\n<b>Программа создана\nserso aka se.solovyev</b>\n\n
+		Сайт приложения: <a href="https://vk.com/calculatorpp">https://vk.com/calculatorpp</a>\n\n
+		Эта программа с открытыми исходным кодом:\nон может быть найден на \n
+		<a href="https://github.com/serso/android-calculatorpp">http://github.com</a>\n\n
+		За подробной информацией, пожалуйста,\nобращайтесь на почту\n<a href="mailto:se.solovyev@gmail.com">
+			se.solovyev@gmail.com</a>\n
+		или посетите сайт \n<a href="http://se.solovyev.org">http://se.solovyev.org</a>\n\n
+		Если вы хотите поддержать проект материально\nвы можете купить специальную опцию из настроек приложения\n\n
+		Если вам понравилось приложение -\nпоставьте 5 звёздочек в\n
+		<a href="https://market.android.com/details?id=org.solovyev.android.calculator">Google Play</a>\n\n
+		Это приложение использует следующие открытые библиотеки:\n
+		<a href="http://simple.sourceforge.net">Simple (XML serialization)</a>\n
+		<a href="http://meditorworld.appspot.com/meditor.txt">JSCL</a>
+	</string>
+	<string name="cpp_share_link">https://vk.com/calculatorpp</string>
 	<string name="c_release_notes">Примечания к выпуску</string>
 	<string name="c_release_notes_for_title">"Примечания к выпуску версии "</string>
+
 </resources>
--- a/android-app-core/res/values-ru/text_wizard.xml
+++ b/android-app-core/res/values-ru/text_wizard.xml
@@ -28,4 +28,25 @@
  <string name="cpp_wizard_final_donate">Пожертвовать деньги</string>
  <string name="cpp_wizard_final_translate">Перевести язык</string>
  <string name="cpp_wizard_final_contribute">Поучавствовать в разработке</string>
+	<string name="cpp_wizard_layout_optimized">Оптимизированная</string>
+	<string name="cpp_wizard_layout_big_buttons">С большими кнопками</string>
+	<string name="cpp_wizard_mode_simple">Простой</string>
+	<string name="cpp_wizard_mode_simple_description">В простом режиме только базовая функциональность доступна на главном экране. Результат округляется до 5 знаков, градусы установлены единицами измерения углов по умолчанию.</string>
+	<string name="cpp_wizard_mode_engineer">Инженерный</string>
+	<string name="cpp_wizard_mode_engineer_description">В инженерном режиме дополнительные функции доступны на главном экране. Результат не округляется и представлен в инженерной нотации, радианы установлены единицами измерения углов по умолчанию.</string>
+	<string name="cpp_restart_wizard">Начать визард</string>
+	<string name="cpp_wizard_dragbutton_action_end">Замечательно! Нажмите на кнопку ещё раз, чтобы повторить сначала</string>
+	<string name="cpp_wizard_dragbutton_action_center">Нажмите на кнопку ниже для того, чтобы вопспользоваться 9</string>
+	<string name="cpp_wizard_dragbutton_action_up">Потяните из центра кнопки вниз для того, чтобы воспользоваться %</string>
+	<string name="cpp_wizard_dragbutton_action_left">Потяните из центра кнопки влево для того, чтобы воспользоваться sin</string>
+	<string name="cpp_wizard_dragbutton_action_down">Потяните из центра кнопки вниз для того, чтобы воспользоваться ^2</string>
+	<string name="cpp_wizard_welcome_title">Приветствие</string>
+	<string name="cpp_wizard_layout_title">Выберите раскладку</string>
+	<string name="cpp_wizard_mode_title">Выберите режим</string>
+	<string name="cpp_wizard_onscreen_calculator_title">Калькулятор в отдельном окне</string>
+	<string name="cpp_wizard_dragbutton_title">Основы использования кнопок</string>
+	<string name="cpp_wizard_onscreen_description">Калькулятор в отдельном окне позволяет вам произодить вычисления не закрывая при этом другие приложения</string>
+	<string name="cpp_wizard_onscreen_checkbox">Включить калькулятор в отдельном окне (вторая иконка появится в списке приложений)</string>
+	<string name="cpp_wizard_dragbutton_description">Специально разработанные кнопки позволяют быстро и просто использовать дополнительные возможности калькулятора
+	</string>
 </resources>
--- a/android-app-core/res/values/text_about.xml
+++ b/android-app-core/res/values/text_about.xml
@@ -1,9 +1,11 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!--Generated by crowdin.net-->
 <resources>
+
 	<string name="c_about">About</string>
+
 	<string name="c_about_content">Copyright © 2009–2013\n\n<b>Created by serso aka se.solovyev</b>\n\n
-		We are on Facebook:<a href="http://facebook.com/calculatorpp">http://facebook.com/calculatorpp</a>\n\n
+		We are on Facebook: <a href="http://facebook.com/calculatorpp">http://facebook.com/calculatorpp</a>\n\n
 		This program is distributed under Apache 2.0 License:\nsource code can be found on\n
 		<a href="https://github.com/serso/android-calculatorpp">http://github.com</a>\n\n
 		For more information please\ncontact the author by email\n
@@ -16,6 +18,9 @@
 		<a href="http://simple.sourceforge.net">Simple (XML serialization)</a>\n
 		<a href="http://meditorworld.appspot.com/meditor.txt">JSCL</a>
 	</string>
+
 	<string name="c_release_notes">Release notes</string>
 	<string name="c_release_notes_for_title">"Release notes for version "</string>
+	<string name="cpp_share_link">http://www.facebook.com/calculatorpp</string>
+
 </resources>
--- a/android-app-core/res/values/text_wizard.xml
+++ b/android-app-core/res/values/text_wizard.xml
@@ -37,4 +37,14 @@
 	<string name="cpp_wizard_final_donate">Donating money</string>
 	<string name="cpp_wizard_final_translate">Translating</string>
 	<string name="cpp_wizard_final_contribute">Contributing source code</string>
+	<string name="cpp_wizard_onscreen_description">Calculator in separate window allows you to do calculations while
+		using other apps on your device
+	</string>
+	<string name="cpp_wizard_onscreen_checkbox">Enable calculator in separate window (second icon will appear in the
+		apps list)
+	</string>
+	<string name="cpp_wizard_dragbutton_description">Drag button is an exclusive feature of Calculator++ which provides
+		fast access to the secondary functions
+	</string>
+
 </resources>
--- a/android-app-core/src/main/java/org/solovyev/android/calculator/CalculatorButton.java
+++ b/android-app-core/src/main/java/org/solovyev/android/calculator/CalculatorButton.java
@@ -32,6 +32,16 @@ import org.solovyev.android.calculator.core.R;
 import java.util.HashMap;
 import java.util.Map;

+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.like;
+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
 * Date: 10/20/12
@@ -54,16 +64,17 @@ public enum CalculatorButton {
 	period(R.id.cpp_button_period, "."),
 	brackets(R.id.cpp_button_round_brackets, "()"),

-	settings(R.id.cpp_button_settings, CalculatorSpecialButton.settings_detached),
+	settings(R.id.cpp_button_settings, settings_detached),
 	like(R.id.cpp_button_like, CalculatorSpecialButton.like),

 	/*last row*/
-	left(R.id.cpp_button_left, CalculatorSpecialButton.cursor_left),
-	right(R.id.cpp_button_right, CalculatorSpecialButton.cursor_right),
-	vars(R.id.cpp_button_vars, CalculatorSpecialButton.vars_detached),
-	functions(R.id.cpp_button_functions, CalculatorSpecialButton.functions_detached),
-	app(R.id.cpp_button_app, CalculatorSpecialButton.open_app),
-	history(R.id.cpp_button_history, CalculatorSpecialButton.history_detached),
+	left(R.id.cpp_button_left, cursor_left),
+	right(R.id.cpp_button_right, cursor_right),
+	vars(R.id.cpp_button_vars, vars_detached),
+	functions(R.id.cpp_button_functions, functions_detached),
+	operators(R.id.cpp_button_operators, operators_detached),
+	app(R.id.cpp_button_app, open_app),
+	history(R.id.cpp_button_history, history_detached),

 	/*operations*/
 	multiplication(R.id.cpp_button_multiplication, "*"),
--- a/android-app-core/src/main/java/org/solovyev/android/calculator/model/AndroidCalculatorEngine.java
+++ b/android-app-core/src/main/java/org/solovyev/android/calculator/model/AndroidCalculatorEngine.java
@@ -274,12 +274,12 @@ public class AndroidCalculatorEngine implements CalculatorEngine, SharedPreferen
 	}

 	@Nonnull
-	public NumeralBase getNumeralBaseFromPrefs(@Nonnull SharedPreferences preferences) {
+	public static NumeralBase getNumeralBaseFromPrefs(@Nonnull SharedPreferences preferences) {
 		return Preferences.numeralBase.getPreference(preferences);
 	}

 	@Nonnull
-	public AngleUnit getAngleUnitsFromPrefs(@Nonnull SharedPreferences preferences) {
+	public static AngleUnit getAngleUnitsFromPrefs(@Nonnull SharedPreferences preferences) {
 		return Preferences.angleUnit.getPreference(preferences);
 	}

--- a/android-app-core/src/main/java/org/solovyev/android/calculator/view/AngleUnitsButton.java
+++ b/android-app-core/src/main/java/org/solovyev/android/calculator/view/AngleUnitsButton.java
@@ -27,6 +27,7 @@ import android.content.res.Resources;
 import android.graphics.Paint;
 import android.text.TextPaint;
 import android.util.AttributeSet;
+import jscl.AngleUnit;

 import javax.annotation.Nonnull;

@@ -41,8 +42,12 @@ import org.solovyev.android.view.drag.DirectionDragButton;
 */
 public class AngleUnitsButton extends DirectionDragButton {

+	@Nonnull
+	private AngleUnit angleUnit;
+
 	public AngleUnitsButton(Context context, @Nonnull AttributeSet attrs) {
 		super(context, attrs);
+		this.angleUnit = Locator.getInstance().getEngine().getAngleUnits();
 	}

 	@Override
@@ -52,11 +57,32 @@ public class AngleUnitsButton extends DirectionDragButton {
 		super.initDirectionTextPaint(basePaint, directionTextData, resources);

 		final TextPaint directionTextPaint = directionTextData.getPaint();
-		if (Locator.getInstance().getEngine().getAngleUnits().name().equals(directionTextData.getText())) {
-			directionTextPaint.setColor(resources.getColor(R.color.cpp_selected_angle_unit_text_color));
-		} else {
-			directionTextPaint.setColor(resources.getColor(R.color.cpp_default_text_color));
+		final int color = getDirectionTextColor(directionTextData.getText());
+		directionTextPaint.setColor(color);
+		if (!isCurrentAngleUnits(directionTextData.getText())) {
 			directionTextPaint.setAlpha(getDirectionTextAlpha());
 		}
 	}
+
+	int getDirectionTextColor(@Nonnull String directionText) {
+		final int color;
+		final Resources resources = getResources();
+		if (isCurrentAngleUnits(directionText)) {
+			color = resources.getColor(R.color.cpp_selected_angle_unit_text_color);
+		} else {
+			color = resources.getColor(R.color.cpp_default_text_color);
+		}
+		return color;
+	}
+
+	boolean isCurrentAngleUnits(@Nonnull String directionText) {
+		return this.angleUnit.name().equals(directionText);
+	}
+
+	public void setAngleUnit(@Nonnull AngleUnit angleUnit) {
+		if (this.angleUnit != angleUnit) {
+			this.angleUnit = angleUnit;
+			invalidate();
+		}
+	}
 }
--- a/android-app-core/src/main/java/org/solovyev/android/calculator/view/NumeralBasesButton.java
+++ b/android-app-core/src/main/java/org/solovyev/android/calculator/view/NumeralBasesButton.java
@@ -27,6 +27,7 @@ import android.content.res.Resources;
 import android.graphics.Paint;
 import android.text.TextPaint;
 import android.util.AttributeSet;
+import jscl.NumeralBase;

 import javax.annotation.Nonnull;

@@ -41,8 +42,12 @@ import org.solovyev.android.view.drag.DirectionDragButton;
 */
 public class NumeralBasesButton extends DirectionDragButton {

+	@Nonnull
+	private NumeralBase numeralBase;
+
 	public NumeralBasesButton(Context context, @Nonnull AttributeSet attrs) {
 		super(context, attrs);
+		this.numeralBase = Locator.getInstance().getEngine().getNumeralBase();
 	}

 	@Override
@@ -52,11 +57,33 @@ public class NumeralBasesButton extends DirectionDragButton {
 		super.initDirectionTextPaint(basePaint, directionTextData, resources);

 		final TextPaint directionTextPaint = directionTextData.getPaint();
-		if (Locator.getInstance().getEngine().getNumeralBase().name().equals(directionTextData.getText())) {
-			directionTextPaint.setColor(resources.getColor(R.color.cpp_selected_angle_unit_text_color));
-		} else {
-			directionTextPaint.setColor(resources.getColor(R.color.cpp_default_text_color));
+
+		final int color = getDirectionTextColor(directionTextData.getText());
+		directionTextPaint.setColor(color);
+
+		if (!isCurrentNumberBase(directionTextData.getText())) {
 			directionTextPaint.setAlpha(getDirectionTextAlpha());
 		}
 	}
+
+	int getDirectionTextColor(@Nonnull String directionText) {
+		final int color;
+		if (isCurrentNumberBase(directionText)) {
+			color = getResources().getColor(R.color.cpp_selected_angle_unit_text_color);
+		} else {
+			color = getResources().getColor(R.color.cpp_default_text_color);
+		}
+		return color;
+	}
+
+	boolean isCurrentNumberBase(@Nonnull String directionText) {
+		return this.numeralBase.name().equals(directionText);
+	}
+
+	public void setNumeralBase(@Nonnull NumeralBase numeralBase) {
+		if (this.numeralBase != numeralBase) {
+			this.numeralBase = numeralBase;
+			invalidate();
+		}
+	}
 }
--- a/android-app-core/src/main/test/org/solovyev/android/calculator/CalculatorTestUtils.java
+++ b/android-app-core/src/main/test/org/solovyev/android/calculator/CalculatorTestUtils.java
@@ -0,0 +1,79 @@
+/*
+ * Copyright 2013 serso aka se.solovyev
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ * Contact details
+ *
+ * Email: se.solovyev@gmail.com
+ * Site:  http://se.solovyev.org
+ */
+
+package org.solovyev.android.calculator;
+
+import android.content.Context;
+import jscl.JsclMathEngine;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+import org.mockito.Mockito;
+import org.solovyev.android.calculator.history.CalculatorHistory;
+import org.solovyev.android.calculator.plot.CalculatorPlotter;
+
+/**
+ * User: serso
+ * Date: 10/7/12
+ * Time: 8:56 PM
+ */
+public class CalculatorTestUtils {
+
+	public static void staticSetUp(@Nullable Context context) throws Exception {
+		Locator.getInstance().init(new CalculatorImpl(), newCalculatorEngine(), Mockito.mock(CalculatorClipboard.class), Mockito.mock(CalculatorNotifier.class), Mockito.mock(CalculatorHistory.class), new SystemOutCalculatorLogger(), Mockito.mock(CalculatorPreferenceService.class), Mockito.mock(CalculatorKeyboard.class), Mockito.mock(CalculatorPlotter.class), null);
+		Locator.getInstance().getEngine().init();
+
+		if (context != null) {
+			initViews(context);
+		}
+	}
+
+	public static void initViews(@Nonnull Context context) {
+		final AndroidCalculatorEditorView editor = new AndroidCalculatorEditorView(context);
+		editor.init();
+		Locator.getInstance().getEditor().setView(editor);
+
+		final AndroidCalculatorDisplayView display = new AndroidCalculatorDisplayView(context);
+		display.init(context);
+		Locator.getInstance().getDisplay().setView(display);
+	}
+
+	public static void staticSetUp() throws Exception {
+		staticSetUp(null);
+	}
+
+
+	@Nonnull
+	static CalculatorEngineImpl newCalculatorEngine() {
+		final MathEntityDao mathEntityDao = Mockito.mock(MathEntityDao.class);
+
+		final JsclMathEngine jsclEngine = JsclMathEngine.getInstance();
+
+		final CalculatorVarsRegistry varsRegistry = new CalculatorVarsRegistry(jsclEngine.getConstantsRegistry(), mathEntityDao);
+		final CalculatorFunctionsMathRegistry functionsRegistry = new CalculatorFunctionsMathRegistry(jsclEngine.getFunctionsRegistry(), mathEntityDao);
+		final CalculatorOperatorsMathRegistry operatorsRegistry = new CalculatorOperatorsMathRegistry(jsclEngine.getOperatorsRegistry(), mathEntityDao);
+		final CalculatorPostfixFunctionsRegistry postfixFunctionsRegistry = new CalculatorPostfixFunctionsRegistry(jsclEngine.getPostfixFunctionsRegistry(), mathEntityDao);
+
+		return new CalculatorEngineImpl(jsclEngine, varsRegistry, functionsRegistry, operatorsRegistry, postfixFunctionsRegistry, null);
+	}
+}
--- a/android-app-core/src/main/test/org/solovyev/android/calculator/view/AngleUnitsButtonTest.java
+++ b/android-app-core/src/main/test/org/solovyev/android/calculator/view/AngleUnitsButtonTest.java
@@ -0,0 +1,75 @@
+package org.solovyev.android.calculator.view;
+
+import android.app.Activity;
+import jscl.AngleUnit;
+
+import java.util.ArrayList;
+
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mockito;
+import org.robolectric.Robolectric;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.res.Attribute;
+import org.robolectric.shadows.ShadowActivity;
+
+import static jscl.AngleUnit.deg;
+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;
+
+@RunWith(RobolectricTestRunner.class)
+public class AngleUnitsButtonTest {
+
+	private AngleUnitsButton button;
+
+	@Before
+	public void setUp() throws Exception {
+		staticSetUp();
+
+		final Activity context = Robolectric.buildActivity(Activity.class).create().get();
+		final ShadowActivity activity = Robolectric.shadowOf(context);
+		button = new AngleUnitsButton(context, activity.createAttributeSet(new ArrayList<Attribute>(), AngleUnitsButton.class));
+	}
+
+	@Test
+	public void testShouldReturnDifferentColorsForDifferentAngleUnits() throws Exception {
+		button.setAngleUnit(deg);
+
+		assertEquals(button.getDirectionTextColor(deg.name()), button.getDirectionTextColor(deg.name()));
+		assertEquals(button.getDirectionTextColor(grad.name()), button.getDirectionTextColor(rad.name()));
+		assertNotSame(button.getDirectionTextColor(deg.name()), button.getDirectionTextColor(rad.name()));
+		assertNotSame(button.getDirectionTextColor(deg.name()), button.getDirectionTextColor(grad.name()));
+		assertNotSame(button.getDirectionTextColor(deg.name()), button.getDirectionTextColor(turns.name()));
+	}
+
+	@Test
+	public void testIsCurrentAngleUnits() throws Exception {
+		button.setAngleUnit(rad);
+		assertTrue(button.isCurrentAngleUnits(rad.name()));
+		assertFalse(button.isCurrentAngleUnits(deg.name()));
+		assertFalse(button.isCurrentAngleUnits(grad.name()));
+	}
+
+	@Test
+	public void testInvalidateShouldBeCalledOnlyWhenChangeIsDone() throws Exception {
+		button.setAngleUnit(rad);
+
+		button = Mockito.spy(button);
+
+		button.setAngleUnit(deg);
+		verify(button, times(1)).invalidate();
+
+		button.setAngleUnit(deg);
+		verify(button, times(1)).invalidate();
+	}
+}
--- a/android-app-core/src/main/test/org/solovyev/android/calculator/view/NumeralBasesButtonTest.java
+++ b/android-app-core/src/main/test/org/solovyev/android/calculator/view/NumeralBasesButtonTest.java
@@ -0,0 +1,76 @@
+package org.solovyev.android.calculator.view;
+
+import android.app.Activity;
+import jscl.NumeralBase;
+
+import java.util.ArrayList;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mockito;
+import org.robolectric.Robolectric;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.res.Attribute;
+import org.robolectric.shadows.ShadowActivity;
+
+import static jscl.AngleUnit.deg;
+import static jscl.AngleUnit.rad;
+import static jscl.NumeralBase.bin;
+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;
+
+@RunWith(RobolectricTestRunner.class)
+public class NumeralBasesButtonTest {
+
+	private NumeralBasesButton button;
+
+	@Before
+	public void setUp() throws Exception {
+		staticSetUp();
+
+		final Activity context = Robolectric.buildActivity(Activity.class).create().get();
+		final ShadowActivity activity = Robolectric.shadowOf(context);
+		button = new NumeralBasesButton(context, activity.createAttributeSet(new ArrayList<Attribute>(), NumeralBasesButton.class));
+	}
+
+	@Test
+	public void testShouldReturnDifferentColorsForDifferentNumeralBase() throws Exception {
+		button.setNumeralBase(dec);
+
+		assertEquals(button.getDirectionTextColor(dec.name()), button.getDirectionTextColor(dec.name()));
+		assertEquals(button.getDirectionTextColor(hex.name()), button.getDirectionTextColor(bin.name()));
+		assertNotSame(button.getDirectionTextColor(dec.name()), button.getDirectionTextColor(bin.name()));
+		assertNotSame(button.getDirectionTextColor(dec.name()), button.getDirectionTextColor(hex.name()));
+		assertNotSame(button.getDirectionTextColor(dec.name()), button.getDirectionTextColor(oct.name()));
+	}
+
+	@Test
+	public void testIsCurrentNumeralBase() throws Exception {
+		button.setNumeralBase(dec);
+		assertTrue(button.isCurrentNumberBase(dec.name()));
+		assertFalse(button.isCurrentNumberBase(hex.name()));
+		assertFalse(button.isCurrentNumberBase(bin.name()));
+	}
+
+	@Test
+	public void testInvalidateShouldBeCalledOnlyWhenChangeIsDone() throws Exception {
+		button.setNumeralBase(dec);
+
+		button = Mockito.spy(button);
+
+		button.setNumeralBase(hex);
+		verify(button, times(1)).invalidate();
+
+		button.setNumeralBase(hex);
+		verify(button, times(1)).invalidate();
+	}
+}
--- a/android-app/res/layout/cpp_app_button_donate.xml
+++ b/android-app/res/layout/cpp_app_button_donate.xml
@@ -24,6 +24,6 @@

 <ImageButton xmlns:a="http://schemas.android.com/apk/res/android"
 			 a:id="@id/cpp_button_like"
-			 a:src="@drawable/kb_facebook"
+			 a:src="@drawable/kb_share"
 			 style="?cpp_control_image_button_style"
 			 a:onClick="likeButtonClickHandler"/>
--- a/android-app/res/layout/cpp_wizard_step_drag_button.xml
+++ b/android-app/res/layout/cpp_wizard_step_drag_button.xml
@@ -29,7 +29,7 @@
 			  a:orientation="vertical">

 	<TextView
-			a:text="Drag button is an exclusive feature of Calculator++ which provides fast access to the secondary functions"
+			a:text="@string/cpp_wizard_dragbutton_description"
 			a:layout_height="wrap_content"
 			a:layout_width="match_parent"/>

--- a/android-app/res/layout/cpp_wizard_step_onscreen.xml
+++ b/android-app/res/layout/cpp_wizard_step_onscreen.xml
@@ -28,7 +28,7 @@
 			  a:orientation="vertical">

 	<TextView
-			a:text="Calculator in separate window allows you to do calculations while using other apps on your device"
+			a:text="@string/cpp_wizard_onscreen_description"
 			a:layout_height="wrap_content"
 			a:layout_width="match_parent"/>

@@ -36,6 +36,6 @@
 			a:id="@+id/wizard_onscreen_app_enabled_checkbox"
 			a:layout_height="wrap_content"
 			a:layout_width="match_parent"
-			a:text="Enable calculator in separate window (second icon will appear in the apps list)"/>
+			a:text="@string/cpp_wizard_onscreen_checkbox"/>

 </LinearLayout>
--- a/android-app/res/layout/history_item.xml
+++ b/android-app/res/layout/history_item.xml
@@ -43,7 +43,6 @@
 				a:id="@+id/history_item"
 				a:layout_width="fill_parent"
 				a:layout_height="fill_parent"
-				a:textColor="@color/cpp_button_operator_text_color"
 				style="@style/history_item"/>

 	</LinearLayout>
--- a/android-app/res/layout/saved_history_item.xml
+++ b/android-app/res/layout/saved_history_item.xml
@@ -36,7 +36,6 @@
 			a:id="@+id/history_item"
 			a:layout_width="fill_parent"
 			a:layout_height="fill_parent"
-			a:textColor="@color/cpp_button_operator_text_color"
 			style="@style/history_item"/>

 	<LinearLayout
--- a/android-app/res/layout/var_edit.xml
+++ b/android-app/res/layout/var_edit.xml
@@ -46,6 +46,69 @@
 				style="@style/cpp_default_text_size"
 				a:inputType="text"/>

+		<LinearLayout
+				a:id="@+id/var_edit_greek_buttons_1"
+				a:layout_height="wrap_content"
+				a:layout_width="match_parent"
+				a:orientation="horizontal">
+
+			<Button a:text="α"
+					a:layout_height="wrap_content"
+					a:layout_width="0dp"
+					a:layout_weight="1"/>
+
+			<Button a:text="β"
+					a:layout_height="wrap_content"
+					a:layout_width="0dp"
+					a:layout_weight="1"/>
+
+			<Button a:text="γ"
+					a:layout_height="wrap_content"
+					a:layout_width="0dp"
+					a:layout_weight="1"/>
+
+			<Button a:text="δ"
+					a:layout_height="wrap_content"
+					a:layout_width="0dp"
+					a:layout_weight="1"/>
+
+			<Button a:text="ε"
+					a:layout_height="wrap_content"
+					a:layout_width="0dp"
+					a:layout_weight="1"/>
+
+		</LinearLayout>
+
+		<LinearLayout a:id="@+id/var_edit_greek_buttons_2"
+					  a:layout_height="wrap_content"
+					  a:layout_width="match_parent"
+					  a:orientation="horizontal">
+			<Button a:text="θ"
+					a:layout_height="wrap_content"
+					a:layout_width="0dp"
+					a:layout_weight="1"/>
+
+			<Button a:text="λ"
+					a:layout_height="wrap_content"
+					a:layout_width="0dp"
+					a:layout_weight="1"/>
+
+			<Button a:text="μ"
+					a:layout_height="wrap_content"
+					a:layout_width="0dp"
+					a:layout_weight="1"/>
+
+			<Button a:text="τ"
+					a:layout_height="wrap_content"
+					a:layout_width="0dp"
+					a:layout_weight="1"/>
+
+			<Button a:text="φ"
+					a:layout_height="wrap_content"
+					a:layout_width="0dp"
+					a:layout_weight="1"/>
+		</LinearLayout>
+
 		<TextView
 				a:layout_height="wrap_content"
 				a:layout_width="match_parent"
--- a/android-app/src/main/java/org/solovyev/android/calculator/AbstractCalculatorHelper.java
+++ b/android-app/src/main/java/org/solovyev/android/calculator/AbstractCalculatorHelper.java
@@ -52,6 +52,8 @@ import java.util.List;

 import static org.solovyev.android.calculator.CalculatorPreferences.Gui.Layout.simple;
 import static org.solovyev.android.calculator.CalculatorPreferences.Gui.Layout.simple_mobile;
+import static org.solovyev.android.calculator.model.AndroidCalculatorEngine.Preferences.angleUnit;
+import static org.solovyev.android.calculator.model.AndroidCalculatorEngine.Preferences.numeralBase;

 /**
 * User: serso
@@ -75,6 +77,12 @@ public abstract class AbstractCalculatorHelper implements SharedPreferences.OnSh
 	@Nonnull
 	private String logTag = "CalculatorActivity";

+	@Nullable
+	private AngleUnitsButton angleUnitsButton;
+
+	@Nullable
+	private NumeralBasesButton clearButton;
+
 	protected AbstractCalculatorHelper() {
 	}

@@ -151,12 +159,12 @@ public abstract class AbstractCalculatorHelper implements SharedPreferences.OnSh
 			equalsButton.setOnDragListener(new OnDragListenerVibrator(newOnDragListener(new EqualsDragProcessor(), dragPreferences), vibrator, preferences));
 		}

-		final AngleUnitsButton angleUnitsButton = (AngleUnitsButton) getButton(root, R.id.cpp_button_6);
+		angleUnitsButton = getButton(root, R.id.cpp_button_6);
 		if (angleUnitsButton != null) {
 			angleUnitsButton.setOnDragListener(new OnDragListenerVibrator(newOnDragListener(new CalculatorButtons.AngleUnitsChanger(activity), dragPreferences), vibrator, preferences));
 		}

-		final NumeralBasesButton clearButton = (NumeralBasesButton) getButton(root, R.id.cpp_button_clear);
+		clearButton = getButton(root, R.id.cpp_button_clear);
 		if (clearButton != null) {
 			clearButton.setOnDragListener(new OnDragListenerVibrator(newOnDragListener(new CalculatorButtons.NumeralBasesChanger(activity), dragPreferences), vibrator, preferences));
 		}
@@ -266,12 +274,22 @@ public abstract class AbstractCalculatorHelper implements SharedPreferences.OnSh

 	@Override
 	public void onSharedPreferenceChanged(SharedPreferences preferences, String key) {
-		if (key != null && key.startsWith("org.solovyev.android.calculator.DragButtonCalibrationActivity")) {
+		if (key.startsWith("org.solovyev.android.calculator.DragButtonCalibrationActivity")) {
 			final SimpleOnDragListener.Preferences dragPreferences = SimpleOnDragListener.getPreferences(preferences, CalculatorApplication.getInstance());
 			for (DragPreferencesChangeListener dragPreferencesChangeListener : dpclRegister.getListeners()) {
 				dragPreferencesChangeListener.onDragPreferencesChange(dragPreferences);
 			}
 		}
+
+		if (angleUnit.isSameKey(key) || numeralBase.isSameKey(key)) {
+			if (angleUnitsButton != null) {
+				angleUnitsButton.setAngleUnit(angleUnit.getPreference(preferences));
+			}
+
+			if (clearButton != null) {
+				clearButton.setNumeralBase(numeralBase.getPreference(preferences));
+			}
+		}
 	}

 	public void onDestroy(@Nonnull Activity activity) {
--- a/android-app/src/main/java/org/solovyev/android/calculator/CalculatorActivityLauncher.java
+++ b/android-app/src/main/java/org/solovyev/android/calculator/CalculatorActivityLauncher.java
@@ -205,7 +205,7 @@ public final class CalculatorActivityLauncher implements CalculatorEventListener
 	}

 	public static void likeButtonPressed(@Nonnull final Context context) {
-		final Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(CalculatorApplication.FACEBOOK_APP_URL));
+		final Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(context.getString(R.string.cpp_share_link)));
 		Android.addIntentFlags(intent, false, context);
 		context.startActivity(intent);
 	}
--- a/android-app/src/main/java/org/solovyev/android/calculator/CalculatorApplication.java
+++ b/android-app/src/main/java/org/solovyev/android/calculator/CalculatorApplication.java
@@ -72,7 +72,6 @@ public class CalculatorApplication extends android.app.Application implements Sh
 	*/

 	private static final String TAG = "Calculator++ Application";
-	public static final String FACEBOOK_APP_URL = "http://www.facebook.com/calculatorpp";

 	public static final String AD_FREE_PRODUCT_ID = "ad_free";
 	public static final String AD_FREE_P_KEY = "org.solovyev.android.calculator_ad_free";
--- a/android-app/src/main/java/org/solovyev/android/calculator/CalculatorKeyboardFragment.java
+++ b/android-app/src/main/java/org/solovyev/android/calculator/CalculatorKeyboardFragment.java
@@ -36,6 +36,14 @@ import javax.annotation.Nullable;

 import org.solovyev.android.calculator.model.AndroidCalculatorEngine;

+import static org.solovyev.android.calculator.CalculatorPreferences.Gui.hideNumeralBaseDigits;
+import static org.solovyev.android.calculator.CalculatorPreferences.Gui.showEqualsButton;
+import static org.solovyev.android.calculator.NumeralBaseButtons.toggleNumericDigits;
+import static org.solovyev.android.calculator.model.AndroidCalculatorEngine.Preferences;
+import static org.solovyev.android.calculator.model.AndroidCalculatorEngine.Preferences.angleUnit;
+import static org.solovyev.android.calculator.model.AndroidCalculatorEngine.Preferences.multiplicationSign;
+import static org.solovyev.android.calculator.model.AndroidCalculatorEngine.Preferences.numeralBase;
+
 /**
 * User: Solovyev_S
 * Date: 25.09.12
@@ -108,21 +116,6 @@ public class CalculatorKeyboardFragment extends SherlockFragment implements Shar

 	}

-	/*    private static void setMarginsForView(@Nullable View view, int marginLeft, int marginBottom, @Nonnull Context context) {
-		// IMPORTANT: this is workaround for probably android bug
-    	// currently margin values set in styles are not applied for some reasons to the views (using include tag) => set them manually
-
-        if (view != null) {
-            final DisplayMetrics dm = context.getResources().getDisplayMetrics();
-            if (view.getLayoutParams() instanceof LinearLayout.LayoutParams) {
-                final LinearLayout.LayoutParams oldParams = (LinearLayout.LayoutParams) view.getLayoutParams();
-                final LinearLayout.LayoutParams newParams = new LinearLayout.LayoutParams(oldParams.width, oldParams.height, oldParams.weight);
-                newParams.setMargins(AndroidUtils.toPixels(dm, marginLeft), 0, 0, AndroidUtils.toPixels(dm, marginBottom));
-                view.setLayoutParams(newParams);
-            }
-        }
-    }*/
-
 	@Override
 	public void onActivityCreated(Bundle savedInstanceState) {
 		super.onActivityCreated(savedInstanceState);
@@ -130,25 +123,15 @@ public class CalculatorKeyboardFragment extends SherlockFragment implements Shar

 	@Override
 	public void onSharedPreferenceChanged(SharedPreferences preferences, String key) {
-		if (AndroidCalculatorEngine.Preferences.numeralBase.getKey().equals(key) ||
-				CalculatorPreferences.Gui.hideNumeralBaseDigits.getKey().equals(key)) {
-			NumeralBaseButtons.toggleNumericDigits(this.getActivity(), preferences);
+		if (numeralBase.isSameKey(key) || hideNumeralBaseDigits.isSameKey(key)) {
+			toggleNumericDigits(this.getActivity(), preferences);
 		}

-		if (AndroidCalculatorEngine.Preferences.angleUnit.getKey().equals(key) ||
-				AndroidCalculatorEngine.Preferences.numeralBase.getKey().equals(key)) {
-			View view = getView();
-			if (view != null) {
-				// we should update state of angle units/numeral base button => we can achieve it by invalidating the whole view
-				view.invalidate();
-			}
-		}
-
-		if (CalculatorPreferences.Gui.showEqualsButton.getKey().equals(key)) {
+		if (showEqualsButton.isSameKey(key)) {
 			CalculatorButtons.toggleEqualsButton(preferences, this.getActivity());
 		}

-		if (AndroidCalculatorEngine.Preferences.multiplicationSign.getKey().equals(key)) {
+		if (multiplicationSign.isSameKey(key)) {
 			CalculatorButtons.initMultiplicationButton(getView());
 		}
 	}
--- a/android-app/src/main/java/org/solovyev/android/calculator/NumeralBaseButtons.java
+++ b/android-app/src/main/java/org/solovyev/android/calculator/NumeralBaseButtons.java
@@ -30,6 +30,10 @@ import javax.annotation.Nonnull;

 import org.solovyev.android.calculator.model.AndroidCalculatorEngine;

+import static jscl.NumeralBase.hex;
+import static org.solovyev.android.calculator.CalculatorPreferences.Gui.hideNumeralBaseDigits;
+import static org.solovyev.android.calculator.model.AndroidCalculatorEngine.Preferences.numeralBase;
+
 /**
 * User: serso
 * Date: 4/20/12
@@ -48,12 +52,12 @@ public class NumeralBaseButtons {
 	}

 	public static void toggleNumericDigits(@Nonnull Activity activity, @Nonnull SharedPreferences preferences) {
-		if (CalculatorPreferences.Gui.hideNumeralBaseDigits.getPreference(preferences)) {
-			final NumeralBase nb = AndroidCalculatorEngine.Preferences.numeralBase.getPreference(preferences);
+		if (hideNumeralBaseDigits.getPreference(preferences)) {
+			final NumeralBase nb = numeralBase.getPreference(preferences);
 			toggleNumericDigits(activity, nb);
 		} else {
 			// set HEX to show all digits
-			AndroidNumeralBase.valueOf(NumeralBase.hex).toggleButtons(true, activity);
+			AndroidNumeralBase.valueOf(hex).toggleButtons(true, activity);
 		}
 	}
 }
--- a/android-app/src/main/java/org/solovyev/android/calculator/math/edit/AbstractMathEntityListFragment.java
+++ b/android-app/src/main/java/org/solovyev/android/calculator/math/edit/AbstractMathEntityListFragment.java
@@ -80,8 +80,6 @@ public abstract class AbstractMathEntityListFragment<T extends MathEntity> exten

 	public static final String MATH_ENTITY_CATEGORY_EXTRA_STRING = "org.solovyev.android.calculator.CalculatorVarsActivity_math_entity_category";

-	protected final static List<Character> acceptableChars = Arrays.asList(Strings.toObjects("1234567890abcdefghijklmnopqrstuvwxyzйцукенгшщзхъфывапролджэячсмитьбюё_".toCharArray()));
-

 	/*
 	**********************************************************************
--- a/android-app/src/main/java/org/solovyev/android/calculator/math/edit/VarEditDialogFragment.java
+++ b/android-app/src/main/java/org/solovyev/android/calculator/math/edit/VarEditDialogFragment.java
@@ -22,6 +22,7 @@

 package org.solovyev.android.calculator.math.edit;

+import android.app.Dialog;
 import android.os.Bundle;
 import android.support.v4.app.DialogFragment;
 import android.support.v4.app.FragmentManager;
@@ -30,17 +31,24 @@ import android.text.TextWatcher;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
-import android.view.WindowManager;
+import android.widget.Button;
 import android.widget.EditText;
 import android.widget.Toast;
 import jscl.math.function.IConstant;

+import java.util.Arrays;
+import java.util.List;
+
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;

+import org.solovyev.android.Views;
 import org.solovyev.android.calculator.*;
 import org.solovyev.android.calculator.model.Var;
 import org.solovyev.android.sherlock.AndroidSherlockUtils;
+import org.solovyev.common.text.Strings;
+
+import static android.view.WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE;

 /**
 * User: Solovyev_S
@@ -49,6 +57,8 @@ import org.solovyev.android.sherlock.AndroidSherlockUtils;
 */
 public class VarEditDialogFragment extends DialogFragment implements CalculatorEventListener {

+	private final static List<Character> acceptableChars = Arrays.asList(Strings.toObjects("1234567890abcdefghijklmnopqrstuvwxyzйцукенгшщзхъфывапролджэячсмитьбюёαβγδεζηθικλμνξοπρστυφχψω_".toCharArray()));
+
 	@Nonnull
 	private final Input input;

@@ -101,7 +111,7 @@ public class VarEditDialogFragment extends DialogFragment implements CalculatorE
 			public void afterTextChanged(Editable s) {
 				for (int i = 0; i < s.length(); i++) {
 					char c = s.charAt(i);
-					if (!AbstractMathEntityListFragment.acceptableChars.contains(c)) {
+					if (!acceptableChars.contains(c)) {
 						s.delete(i, i + 1);
 						Toast.makeText(getActivity(), String.format(errorMsg, c), Toast.LENGTH_SHORT).show();
 					}
@@ -109,9 +119,12 @@ public class VarEditDialogFragment extends DialogFragment implements CalculatorE
 			}
 		});

+		processGreekButtons(root, editName, R.id.var_edit_greek_buttons_1);
+		processGreekButtons(root, editName, R.id.var_edit_greek_buttons_2);
+
 		// show soft keyboard automatically
 		editName.requestFocus();
-		getDialog().getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE);
+		getDialog().getWindow().setSoftInputMode(SOFT_INPUT_STATE_VISIBLE);

 		final EditText editValue = (EditText) root.findViewById(R.id.var_edit_value);
 		editValue.setText(input.getValue());
@@ -149,6 +162,21 @@ public class VarEditDialogFragment extends DialogFragment implements CalculatorE
 		}
 	}

+	private void processGreekButtons(@Nonnull View root, @Nonnull final EditText editName, int greekButtonsViewId) {
+		final ViewGroup greekButtons = (ViewGroup) root.findViewById(greekButtonsViewId);
+		Views.processViewsOfType(greekButtons, Button.class, new Views.ViewProcessor<Button>() {
+			@Override
+			public void process(@Nonnull final Button greekButton) {
+				greekButton.setOnClickListener(new View.OnClickListener() {
+					@Override
+					public void onClick(View v) {
+						editName.append(greekButton.getText());
+					}
+				});
+			}
+		});
+	}
+
 	@Override
 	public void onCalculatorEvent(@Nonnull CalculatorEventData calculatorEventData, @Nonnull CalculatorEventType calculatorEventType, @Nullable Object data) {
 		switch (calculatorEventType) {
--- a/core/src/main/java/org/solovyev/android/calculator/CalculatorEngineImpl.java
+++ b/core/src/main/java/org/solovyev/android/calculator/CalculatorEngineImpl.java
@@ -179,13 +179,26 @@ public class CalculatorEngineImpl implements CalculatorEngine {
 	@Override
 	public void reset() {
 		synchronized (lock) {
-			varsRegistry.load();
-			functionsRegistry.load();
-			operatorsRegistry.load();
-			postfixFunctionsRegistry.load();
+			safeLoadRegistry(varsRegistry);
+			safeLoadRegistry(functionsRegistry);
+			safeLoadRegistry(operatorsRegistry);
+			safeLoadRegistry(postfixFunctionsRegistry);
 		}
 	}

+	private void safeLoadRegistry(@Nonnull CalculatorMathRegistry<?> registry) {
+		try {
+			registry.load();
+		} catch (Exception e) {
+			logException(e);
+		}
+	}
+
+	private void logException(@Nonnull Exception e) {
+		final CalculatorLogger logger = Locator.getInstance().getLogger();
+		logger.error("Engine", e.getMessage(), e);
+	}
+
 	@Override
 	public void softReset() {
 		Locator.getInstance().getCalculator().fireCalculatorEvent(CalculatorEventType.engine_preferences_changed, null);