NPE fixed

AndroidManifest.xml

@@ -29,6 +29,7 @@
 
 		</activity>
 
+		<!--NOTE: a:configChanges="orientation|keyboardHidden" is needed to correct work of dialog windows (not to close them on orientation change) -->
 		<activity a:name=".CalculatorPreferencesActivity"
 				  a:label="@string/c_app_settings"
 				  a:configChanges="orientation|keyboardHidden"/>

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

@@ -7,16 +7,12 @@ package org.solovyev.android.calculator;
 
 import android.app.Activity;
 import android.app.AlertDialog;
-import android.content.DialogInterface;
-import android.content.Intent;
 import android.content.SharedPreferences;
-import android.net.Uri;
 import android.os.Bundle;
 import android.os.Vibrator;
 import android.preference.PreferenceManager;
 import android.text.ClipboardManager;
 import android.text.Html;
-import android.text.method.LinkMovementMethod;
 import android.util.Log;
 import android.util.TypedValue;
 import android.view.*;
@@ -43,7 +39,7 @@ import org.solovyev.android.calculator.view.NumeralBasesButton;
 import org.solovyev.android.history.HistoryDragProcessor;
 import org.solovyev.android.prefs.IntegerPreference;
 import org.solovyev.android.prefs.Preference;
-import org.solovyev.android.view.*;
+import org.solovyev.android.view.VibratorContainer;
 import org.solovyev.android.view.drag.*;
 import org.solovyev.common.utils.Announcer;
 import org.solovyev.common.utils.Point2d;
@@ -124,7 +120,7 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 				preferences.registerOnSharedPreferenceChangeListener(additionalAdditionalTitleText);
 			} catch (ClassCastException e) {
 				// super fix for issue with class cast in android.view.Window.setFeatureInt() (see app error reports)
-				Log.d(CalculatorActivity.class.getName(), e.getMessage(), e);
+				Log.e(CalculatorActivity.class.getName(), e.getMessage(), e);
 			}
 		}
 
@@ -194,7 +190,7 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 		}
 
 
-		CalculatorEngine.instance.reset(this, preferences);
+		CalculatorEngine.instance.softReset(this, preferences);
 
 		initMultiplicationButton();
 
@@ -420,7 +416,6 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 			}
 
 			ResourceCache.instance.init(R.id.class, this);
-			CalculatorEngine.instance.init(this, preferences);
 
 			initialized = true;
 		}
@@ -512,30 +507,9 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 		CalculatorActivityLauncher.showVars(this);
 	}
 
-	private final static String paypalDonateUrl = "https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=se%2esolovyev%40gmail%2ecom&lc=RU&item_name=Android%20Calculator&currency_code=USD&bn=PP%2dDonationsBF%3abtn_donateCC_LG%2egif%3aNonHosted";
-
 	@SuppressWarnings({"UnusedDeclaration"})
 	public void donateButtonClickHandler(@NotNull View v) {
-		final LayoutInflater layoutInflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);
+		CalculatorApplication.showDonationDialog(this);
-		final View view = layoutInflater.inflate(R.layout.donate, null);
-
-		final TextView donate = (TextView) view.findViewById(R.id.donateText);
-		donate.setMovementMethod(LinkMovementMethod.getInstance());
-
-		final AlertDialog.Builder builder = new AlertDialog.Builder(this)
-				.setCancelable(true)
-				.setNegativeButton(R.string.c_cancel, null)
-				.setPositiveButton(R.string.c_donate, new DialogInterface.OnClickListener() {
-					@Override
-					public void onClick(DialogInterface dialog, int which) {
-						final Intent i = new Intent(Intent.ACTION_VIEW);
-						i.setData(Uri.parse(paypalDonateUrl));
-						startActivity(i);
-					}
-				})
-				.setView(view);
-
-		builder.create().show();
 	}
 
 	@Override
@@ -639,7 +613,7 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 		}
 
 		if (CalculatorEngine.Preferences.getPreferenceKeys().contains(key)) {
-			CalculatorEngine.instance.reset(this, preferences);
+			CalculatorEngine.instance.softReset(this, preferences);
 			this.calculatorModel.evaluate();
 		}
 

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

@@ -1,8 +1,19 @@
 package org.solovyev.android.calculator;
 
+import android.app.AlertDialog;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.net.Uri;
+import android.preference.PreferenceManager;
+import android.text.method.LinkMovementMethod;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.TextView;
 import net.robotmedia.billing.BillingController;
 import org.jetbrains.annotations.NotNull;
 import org.solovyev.android.ads.AdsController;
+import org.solovyev.android.calculator.model.CalculatorEngine;
 
 /**
  * User: serso
@@ -11,6 +22,8 @@ import org.solovyev.android.ads.AdsController;
  */
 public class CalculatorApplication extends android.app.Application {
 
+	private static final String paypalDonateUrl = "https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=se%2esolovyev%40gmail%2ecom&lc=RU&item_name=Android%20Calculator&currency_code=USD&bn=PP%2dDonationsBF%3abtn_donateCC_LG%2egif%3aNonHosted";
+
 	public static final String AD_FREE_PRODUCT_ID = "ad_free";
 	public static final String AD_FREE_P_KEY = "org.solovyev.android.calculator_ad_free";
 
@@ -44,5 +57,31 @@ public class CalculatorApplication extends android.app.Application {
 				return CalculatorSecurity.getPK();
 			}
 		});
+
+		CalculatorEngine.instance.init(this, PreferenceManager.getDefaultSharedPreferences(this));
+
+	}
+
+	public static void showDonationDialog(@NotNull final Context context) {
+		final LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(LAYOUT_INFLATER_SERVICE);
+		final View view = layoutInflater.inflate(R.layout.donate, null);
+
+		final TextView donate = (TextView) view.findViewById(R.id.donateText);
+		donate.setMovementMethod(LinkMovementMethod.getInstance());
+
+		final AlertDialog.Builder builder = new AlertDialog.Builder(context)
+				.setCancelable(true)
+				.setNegativeButton(R.string.c_cancel, null)
+				.setPositiveButton(R.string.c_donate, new DialogInterface.OnClickListener() {
+					@Override
+					public void onClick(DialogInterface dialog, int which) {
+						final Intent i = new Intent(Intent.ACTION_VIEW);
+						i.setData(Uri.parse(paypalDonateUrl));
+						context.startActivity(i);
+					}
+				})
+				.setView(view);
+
+		builder.create().show();
 	}
 }

src/main/java/org/solovyev/android/calculator/CalculatorEditor.java

@@ -73,7 +73,6 @@ public class CalculatorEditor extends EditText implements SharedPreferences.OnSh
 		super.onCreateContextMenu(menu);
 
 		menu.removeItem(android.R.id.selectAll);
-		menu.removeItem(android.R.id.startSelectingText);
 	}
 
 	@Override

src/main/java/org/solovyev/android/calculator/math/edit/AbstractMathEntityListActivity.java

@@ -46,7 +46,7 @@ public abstract class AbstractMathEntityListActivity<T extends MathEntity> exten
 
 	protected final static List<Character> acceptableChars = Arrays.asList(StringUtils.toObject("1234567890abcdefghijklmnopqrstuvwxyzйцукенгшщзхъфывапролджэячсмитьбюё_".toCharArray()));
 
-    @NotNull
+    @Nullable
     private MathEntityArrayAdapter<T> adapter;
     
     @Nullable
@@ -168,11 +168,6 @@ public abstract class AbstractMathEntityListActivity<T extends MathEntity> exten
         return t != null && EqualsTool.areEqual(getMathEntityCategory(t), category);
     }
 
-    @NotNull
-    protected MathEntityArrayAdapter<T> getAdapter() {
-        return adapter;
-    }
-
     @NotNull
     protected abstract MathEntityDescriptionGetter getDescriptionGetter();
 
@@ -183,14 +178,17 @@ public abstract class AbstractMathEntityListActivity<T extends MathEntity> exten
     abstract String getMathEntityCategory(@NotNull T t);
 
     protected void sort() {
-        AbstractMathEntityListActivity.this.adapter.sort(new Comparator<T>() {
+		final MathEntityArrayAdapter<T> localAdapter = adapter;
+		if (localAdapter != null) {
+			localAdapter.sort(new Comparator<T>() {
 				@Override
 				public int compare(T function1, T function2) {
 					return function1.getName().compareTo(function2.getName());
 				}
 			});
 
-        AbstractMathEntityListActivity.this.adapter.notifyDataSetChanged();
+			localAdapter.notifyDataSetChanged();
+		}
 	}
 
 	protected static class MathEntityArrayAdapter<T extends MathEntity> extends ArrayAdapter<T> {
@@ -257,4 +255,22 @@ public abstract class AbstractMathEntityListActivity<T extends MathEntity> exten
         @Nullable
         String getDescription(@NotNull Context context, @NotNull String mathEntityName);
     }
+
+	public void addToAdapter(@NotNull T mathEntity) {
+		if (this.adapter != null) {
+			this.adapter.add(mathEntity);
+		}
+	}
+
+	public void removeFromAdapter(@NotNull T mathEntity) {
+		if (this.adapter != null) {
+			this.adapter.remove(mathEntity);
+		}
+	}
+
+	public void notifyAdapter() {
+		if (this.adapter != null) {
+			this.adapter.notifyDataSetChanged();
+		}
+	}
 }

src/main/java/org/solovyev/android/calculator/math/edit/FunctionEditorSaver.java

@@ -140,9 +140,9 @@ public class FunctionEditorSaver implements DialogInterface.OnClickListener{
 				final Function addedVar = mathRegistry.add(varBuilder);
 				if (activity.isInCategory(addedVar)) {
 					if (editedInstance != null) {
-						activity.getAdapter().remove(editedInstance);
+						activity.removeFromAdapter(editedInstance);
 					}
-					activity.getAdapter().add(addedVar);
+					activity.addToAdapter(addedVar);
 				}
 
 				mathRegistry.save(activity);

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

@@ -61,13 +61,13 @@ class MathEntityRemover<T extends MathEntity> implements DialogInterface.OnClick
 			showConfirmationDialog();
 		} else {
 			if (activity.isInCategory(mathEntity)) {
-				activity.getAdapter().remove(mathEntity);
+				activity.removeFromAdapter(mathEntity);
 			}
 
 			varsRegistry.remove(mathEntity);
 			varsRegistry.save(activity);
 			if (activity.isInCategory(mathEntity)) {
-				activity.getAdapter().notifyDataSetChanged();
+				activity.notifyAdapter();
 			}
 		}
 	}

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

@@ -137,9 +137,9 @@ class VarEditorSaver<T extends MathEntity> implements DialogInterface.OnClickLis
 				final T addedVar = mathRegistry.add(varBuilder);
 				if (activity.isInCategory(addedVar)) {
 					if (editedInstance != null) {
-						activity.getAdapter().remove(editedInstance);
+						activity.removeFromAdapter(editedInstance);
 					}
-					activity.getAdapter().add(addedVar);
+					activity.addToAdapter(addedVar);
 				}
 
 				mathRegistry.save(activity);

src/main/java/org/solovyev/android/calculator/model/CalculatorEngine.java

@@ -319,6 +319,27 @@ public enum CalculatorEngine {
 		}
 	}
 
+	public void softReset(@Nullable Context context, @Nullable SharedPreferences preferences) {
+		synchronized (lock) {
+			if (preferences != null) {
+				this.setPrecision(Preferences.precision.getPreference(preferences));
+				this.setRoundResult(Preferences.roundResult.getPreference(preferences));
+				this.setAngleUnits(getAngleUnitsFromPrefs(preferences));
+				this.setNumeralBase(getNumeralBaseFromPrefs(preferences));
+				this.setMultiplicationSign(Preferences.multiplicationSign.getPreference(preferences));
+
+				final String groupingSeparator = Preferences.groupingSeparator.getPreference(preferences);
+				if (StringUtils.isEmpty(groupingSeparator)) {
+					this.getEngine().setUseGroupingSeparator(false);
+				} else {
+					this.getEngine().setUseGroupingSeparator(true);
+					this.getEngine().setGroupingSeparator(groupingSeparator.charAt(0));
+				}
+			}
+		}
+	}
+
+
 	@NotNull
 	public NumeralBase getNumeralBaseFromPrefs(@NotNull SharedPreferences preferences) {
 		return Preferences.numeralBase.getPreference(preferences);