New architecture

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorClipboard.java

@@ -0,0 +1,19 @@
+package org.solovyev.android.calculator;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * User: serso
+ * Date: 9/22/12
+ * Time: 1:34 PM
+ */
+public interface CalculatorClipboard {
+
+    @Nullable
+    String getText();
+
+    void setText(@NotNull String text);
+
+    void setText(@NotNull CharSequence text);
+}

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorDisplayImpl.java

@@ -30,6 +30,7 @@ public class CalculatorDisplayImpl implements CalculatorDisplay {
     public CalculatorDisplayImpl(@NotNull Calculator calculator) {
         this.calculator = calculator;
         this.lastCalculatorEventData = CalculatorEventDataImpl.newInstance(calculator.createFirstEventDataId());
+        this.calculator.addCalculatorEventListener(this);
     }
 
     @Override

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorEditor.java

@@ -59,6 +59,9 @@ public interface CalculatorEditor extends CalculatorEventListener/*, CursorContr
     @NotNull
     CalculatorEditorViewState erase();
 
+    @NotNull
+    CalculatorEditorViewState clear();
+
     @NotNull
     CalculatorEditorViewState setText(@NotNull String text);
 
@@ -68,6 +71,9 @@ public interface CalculatorEditor extends CalculatorEventListener/*, CursorContr
     @NotNull
     CalculatorEditorViewState insert(@NotNull String text);
 
+    @NotNull
+    CalculatorEditorViewState insert(@NotNull String text, int selectionOffset);
+
     @NotNull
     CalculatorEditorViewState moveSelection(int offset);
 

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorEditorImpl.java

@@ -24,6 +24,7 @@ public class CalculatorEditorImpl implements CalculatorEditor {
 
     public CalculatorEditorImpl(@NotNull Calculator calculator) {
         this.calculator = calculator;
+        this.calculator.addCalculatorEventListener(this);
     }
 
     @Override
@@ -130,6 +131,14 @@ public class CalculatorEditorImpl implements CalculatorEditor {
         }
     }
 
+    @NotNull
+    @Override
+    public CalculatorEditorViewState clear() {
+        synchronized (viewLock) {
+            return setText("");
+        }
+    }
+
     @NotNull
     @Override
     public CalculatorEditorViewState setText(@NotNull String text) {
@@ -155,17 +164,27 @@ public class CalculatorEditorImpl implements CalculatorEditor {
     @NotNull
     @Override
     public CalculatorEditorViewState insert(@NotNull String text) {
+        synchronized (viewLock) {
+            return insert(text, 0);
+        }
+    }
+
+    @NotNull
+    @Override
+    public CalculatorEditorViewState insert(@NotNull String text, int selectionOffset) {
         synchronized (viewLock) {
             final int selection = this.lastViewState.getSelection();
             final String oldText = this.lastViewState.getText();
 
-            final StringBuilder newText = new StringBuilder(text.length() + oldText.length());
+            int newTextLength = text.length() + oldText.length();
+            final StringBuilder newText = new StringBuilder(newTextLength);
 
             newText.append(oldText.substring(0, selection));
             newText.append(text);
             newText.append(oldText.substring(selection));
 
-            final CalculatorEditorViewState result = CalculatorEditorViewStateImpl.newInstance(newText.toString(), text.length() + selection);
+            int newSelection = correctSelection(text.length() + selection + selectionOffset, newTextLength);
+            final CalculatorEditorViewState result = CalculatorEditorViewStateImpl.newInstance(newText.toString(), newSelection);
             setViewState(result);
             return result;
         }
@@ -194,8 +213,12 @@ public class CalculatorEditorImpl implements CalculatorEditor {
     }
 
     private int correctSelection(int selection, @NotNull String text) {
+        return correctSelection(selection, text.length());
+    }
+
+    private int correctSelection(int selection, int textLength) {
         int result = Math.max(selection, 0);
-        result = Math.min(result, text.length());
+        result = Math.min(result, textLength);
         return result;
     }
 }

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorImpl.java

@@ -3,6 +3,7 @@ package org.solovyev.android.calculator;
 import jscl.AbstractJsclArithmeticException;
 import jscl.NumeralBase;
 import jscl.NumeralBaseException;
+import jscl.math.Expression;
 import jscl.math.Generic;
 import jscl.text.ParseInterruptedException;
 import org.jetbrains.annotations.NotNull;
@@ -36,9 +37,6 @@ public class CalculatorImpl implements Calculator, CalculatorEventListener {
     @NotNull
     private final AtomicLong counter = new AtomicLong(FIRST_ID);
 
-    @NotNull
-    private final Object lock = new Object();
-
     @NotNull
     private final TextProcessor<PreparedExpression, String> preprocessor = ToJsclTextProcessor.getInstance();
 
@@ -208,13 +206,19 @@ public class CalculatorImpl implements Calculator, CalculatorEventListener {
                           @NotNull JsclOperation operation,
                           @NotNull String expression,
                           @Nullable MessageRegistry mr) {
-        synchronized (lock) {
 
         PreparedExpression preparedExpression = null;
 
         fireCalculatorEvent(newCalculationEventData(operation, expression, sequenceId), CalculatorEventType.calculation_started, new CalculatorInputImpl(expression, operation));
 
         try {
+
+            expression = expression.trim();
+
+            if ( StringUtils.isEmpty(expression) ) {
+                final CalculatorOutputImpl data = new CalculatorOutputImpl("", operation, Expression.valueOf(""));
+                fireCalculatorEvent(newCalculationEventData(operation, expression, sequenceId), CalculatorEventType.calculation_result, data);
+            } else {
                 preparedExpression = preprocessor.process(expression);
 
                 final String jsclExpression = preparedExpression.toString();
@@ -232,6 +236,7 @@ public class CalculatorImpl implements Calculator, CalculatorEventListener {
                 } catch (AbstractJsclArithmeticException e) {
                     handleException(sequenceId, operation, expression, mr, new CalculatorEvalException(e, e, jsclExpression));
                 }
+            }
 
         } catch (ArithmeticException e) {
             handleException(sequenceId, operation, expression, mr, preparedExpression, new CalculatorParseException(expression, new CalculatorMessage(CalculatorMessages.msg_001, MessageType.error, e.getMessage())));
@@ -250,7 +255,6 @@ public class CalculatorImpl implements Calculator, CalculatorEventListener {
             fireCalculatorEvent(newCalculationEventData(operation, expression, sequenceId), CalculatorEventType.calculation_finished, null);
         }
     }
-    }
 
     @NotNull
     private CalculatorEventData newCalculationEventData(@NotNull JsclOperation operation,
@@ -259,7 +263,7 @@ public class CalculatorImpl implements Calculator, CalculatorEventListener {
         return new CalculatorEvaluationEventDataImpl(CalculatorEventDataImpl.newInstance(nextEventDataId(calculationId)), operation, expression);
     }
 
-    private void handleException(@NotNull Long calculationId,
+    private void handleException(@NotNull Long sequenceId,
                                  @NotNull JsclOperation operation,
                                  @NotNull String expression,
                                  @Nullable MessageRegistry mr,
@@ -270,11 +274,11 @@ public class CalculatorImpl implements Calculator, CalculatorEventListener {
                 && preparedExpression != null
                 && preparedExpression.isExistsUndefinedVar()) {
 
-            evaluate(calculationId, JsclOperation.simplify, expression, mr);
+            evaluate(sequenceId, JsclOperation.simplify, expression, mr);
+        } else {
 
+            fireCalculatorEvent(newCalculationEventData(operation, expression, sequenceId), CalculatorEventType.calculation_failed, new CalculatorFailureImpl(parseException));
         }
-
-        fireCalculatorEvent(newCalculationEventData(operation, expression, calculationId), CalculatorEventType.calculation_failed, new CalculatorFailureImpl(parseException));
     }
 
     private void handleException(@NotNull Long calculationId,
@@ -323,9 +327,14 @@ public class CalculatorImpl implements Calculator, CalculatorEventListener {
         if (calculatorEventType == CalculatorEventType.editor_state_changed) {
             final CalculatorEditorChangeEventData changeEventData = (CalculatorEditorChangeEventData) data;
 
+            final String newText = changeEventData.getNewState().getText();
+            final String oldText = changeEventData.getOldState().getText();
+
+            if ( !newText.equals(oldText) ) {
                 evaluate(JsclOperation.numeric, changeEventData.getNewState().getText(), calculatorEventData.getSequenceId());
             }
         }
+    }
 
     public static final class ConversionException extends Exception {
         private ConversionException() {

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorKeyboard.java

@@ -0,0 +1,21 @@
+package org.solovyev.android.calculator;
+
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * User: serso
+ * Date: 9/22/12
+ * Time: 1:08 PM
+ */
+public interface CalculatorKeyboard {
+
+    void digitButtonPressed(@Nullable String text);
+
+    void roundBracketsButtonPressed();
+
+    void pasteButtonPressed();
+
+    void clearButtonPressed();
+
+    void copyButtonPressed();
+}

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorKeyboardImpl.java

@@ -0,0 +1,97 @@
+package org.solovyev.android.calculator;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+import org.solovyev.android.calculator.math.MathType;
+import org.solovyev.common.text.StringUtils;
+
+/**
+ * User: serso
+ * Date: 9/22/12
+ * Time: 1:08 PM
+ */
+public class CalculatorKeyboardImpl implements CalculatorKeyboard {
+
+    @NotNull
+    private final Calculator calculator;
+
+    public CalculatorKeyboardImpl(@NotNull Calculator calculator) {
+        this.calculator = calculator;
+    }
+
+    @Override
+    public void digitButtonPressed(@Nullable final String text) {
+
+        if (!StringUtils.isEmpty(text)) {
+            assert text != null;
+
+            int cursorPositionOffset = 0;
+            final StringBuilder textToBeInserted = new StringBuilder(text);
+
+            final MathType.Result mathType = MathType.getType(text, 0, false);
+            switch (mathType.getMathType()) {
+                case function:
+                    textToBeInserted.append("()");
+                    cursorPositionOffset = -1;
+                    break;
+                case operator:
+                    textToBeInserted.append("()");
+                    cursorPositionOffset = -1;
+                    break;
+                case comma:
+                    textToBeInserted.append(" ");
+                    break;
+            }
+
+            if (cursorPositionOffset == 0) {
+                if (MathType.openGroupSymbols.contains(text)) {
+                    cursorPositionOffset = -1;
+                }
+            }
+
+            final CalculatorEditor editor = CalculatorLocatorImpl.getInstance().getCalculatorEditor();
+            editor.insert(textToBeInserted.toString(), cursorPositionOffset);
+        }
+    }
+
+    @Override
+    public void roundBracketsButtonPressed() {
+        final CalculatorEditor editor = CalculatorLocatorImpl.getInstance().getCalculatorEditor();
+        CalculatorEditorViewState viewState = editor.getViewState();
+
+        final int cursorPosition = viewState.getSelection();
+        final String oldText = viewState.getText();
+
+        final StringBuilder newText = new StringBuilder(oldText.length() + 2);
+        newText.append("(");
+        newText.append(oldText.substring(0, cursorPosition));
+        newText.append(")");
+        newText.append(oldText.substring(cursorPosition));
+        editor.setText(newText.toString(), cursorPosition + 2);
+    }
+
+    @Override
+    public void pasteButtonPressed() {
+        final String text = CalculatorLocatorImpl.getInstance().getCalculatorClipboard().getText();
+        if (text != null) {
+            CalculatorLocatorImpl.getInstance().getCalculatorEditor().insert(text);
+        }
+    }
+
+    @Override
+    public void clearButtonPressed() {
+        CalculatorLocatorImpl.getInstance().getCalculatorEditor().clear();
+    }
+
+    @Override
+    public void copyButtonPressed() {
+        final CalculatorDisplayViewState displayViewState = CalculatorLocatorImpl.getInstance().getCalculatorDisplay().getViewState();
+        if (displayViewState.isValid()) {
+            final CharSequence text = displayViewState.getText();
+            if (!StringUtils.isEmpty(text)) {
+                CalculatorLocatorImpl.getInstance().getCalculatorClipboard().setText(text);
+                CalculatorLocatorImpl.getInstance().getCalculatorNotifier().showMessage(CalculatorMessage.newInfoMessage(CalculatorMessages.result_copied));
+            }
+        }
+    }
+}

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorLocator.java

@@ -22,4 +22,17 @@ public interface CalculatorLocator {
     CalculatorEditor getCalculatorEditor();
 
     void setCalculatorEngine(@NotNull JCalculatorEngine calculatorEngine);
+
+    @NotNull
+    CalculatorKeyboard getCalculatorKeyboard();
+
+    @NotNull
+    CalculatorClipboard getCalculatorClipboard();
+
+    void setCalculatorClipboard(@NotNull CalculatorClipboard calculatorClipboard);
+
+    @NotNull
+    CalculatorNotifier getCalculatorNotifier();
+
+    void setCalculatorNotifier(@NotNull CalculatorNotifier calculatorNotifier);
 }

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorLocatorImpl.java

@@ -21,6 +21,15 @@ public class CalculatorLocatorImpl implements CalculatorLocator {
     @NotNull
     private final CalculatorDisplay calculatorDisplay = new CalculatorDisplayImpl(calculator);
 
+    @NotNull
+    private final CalculatorKeyboard calculatorKeyboard = new CalculatorKeyboardImpl(calculator);
+
+    @NotNull
+    private CalculatorNotifier calculatorNotifier = new DummyCalculatorNotifier();
+
+    @NotNull
+    private CalculatorClipboard calculatorClipboard = new DummyCalculatorClipboard();
+
     @NotNull
     private static final CalculatorLocator instance = new CalculatorLocatorImpl();
 
@@ -60,4 +69,32 @@ public class CalculatorLocatorImpl implements CalculatorLocator {
     public CalculatorEditor getCalculatorEditor() {
         return calculatorEditor;
     }
+
+    @Override
+    @NotNull
+    public CalculatorKeyboard getCalculatorKeyboard() {
+        return calculatorKeyboard;
+    }
+
+    @Override
+    @NotNull
+    public CalculatorClipboard getCalculatorClipboard() {
+        return calculatorClipboard;
+    }
+
+    @Override
+    public void setCalculatorClipboard(@NotNull CalculatorClipboard calculatorClipboard) {
+        this.calculatorClipboard = calculatorClipboard;
+    }
+
+    @Override
+    @NotNull
+    public CalculatorNotifier getCalculatorNotifier() {
+        return calculatorNotifier;
+    }
+
+    @Override
+    public void setCalculatorNotifier(@NotNull CalculatorNotifier calculatorNotifier) {
+        this.calculatorNotifier = calculatorNotifier;
+    }
 }

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorMessage.java

@@ -1,7 +1,9 @@
 package org.solovyev.android.calculator;
 
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 import org.solovyev.common.msg.AbstractMessage;
+import org.solovyev.common.msg.Message;
 import org.solovyev.common.msg.MessageType;
 
 import java.util.List;
@@ -15,14 +17,29 @@ import java.util.ResourceBundle;
  */
 public class CalculatorMessage extends AbstractMessage {
 
-    protected CalculatorMessage(@NotNull String messageCode, @NotNull MessageType messageType, @org.jetbrains.annotations.Nullable Object... parameters) {
+    public CalculatorMessage(@NotNull String messageCode, @NotNull MessageType messageType, @Nullable Object... parameters) {
         super(messageCode, messageType, parameters);
     }
 
-    protected CalculatorMessage(@NotNull String messageCode, @NotNull MessageType messageType, @NotNull List<?> parameters) {
+    public CalculatorMessage(@NotNull String messageCode, @NotNull MessageType messageType, @NotNull List<?> parameters) {
         super(messageCode, messageType, parameters);
     }
 
+    @NotNull
+    public static Message newInfoMessage(@NotNull String messageCode, @Nullable Object... parameters) {
+        return new CalculatorMessage(messageCode, MessageType.info, parameters);
+    }
+
+    @NotNull
+    public static Message newWarningMessage(@NotNull String messageCode, @Nullable Object... parameters) {
+        return new CalculatorMessage(messageCode, MessageType.warning, parameters);
+    }
+
+    @NotNull
+    public static Message newErrorMessage(@NotNull String messageCode, @Nullable Object... parameters) {
+        return new CalculatorMessage(messageCode, MessageType.error, parameters);
+    }
+
     @Override
     protected String getMessagePattern(@NotNull Locale locale) {
         final ResourceBundle rb = CalculatorMessages.getBundle(locale);

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorMessages.java

@@ -17,6 +17,7 @@ public final class CalculatorMessages {
     @NotNull
     private static final Map<Locale, ResourceBundle> bundlesByLocale = new HashMap<Locale, ResourceBundle>();
 
+
     private CalculatorMessages() {
         throw new AssertionError();
     }
@@ -40,30 +41,26 @@ public final class CalculatorMessages {
     }
 
     /* Arithmetic error occurred: {0} */
-    @NotNull
     public static final String msg_001 = "msg_1";
 
     /* Too complex expression*/
-    @NotNull
     public static final String msg_002 = "msg_2";
 
     /* Too long execution time - check the expression*/
-    @NotNull
     public static final String msg_003 = "msg_3";
 
     /* Evaluation was cancelled*/
-    @NotNull
     public static final String msg_004 = "msg_4";
 
     /* No parameters are specified for function: {0}*/
-    @NotNull
     public static final String msg_005 = "msg_5";
 
     /* Infinite loop is detected in expression*/
-    @NotNull
     public static final String msg_006 = "msg_6";
 
     /* Error */
-    @NotNull
     public static final String syntax_error = "syntax_error";
+
+    /* Result copied to clipboard! */
+    public static final String result_copied = "result_copied";
 }

calculatorpp-core/src/main/java/org/solovyev/android/calculator/CalculatorNotifier.java

@@ -0,0 +1,14 @@
+package org.solovyev.android.calculator;
+
+import org.jetbrains.annotations.NotNull;
+import org.solovyev.common.msg.Message;
+
+/**
+ * User: serso
+ * Date: 9/22/12
+ * Time: 1:52 PM
+ */
+public interface CalculatorNotifier {
+
+    void showMessage(@NotNull Message message);
+}

calculatorpp-core/src/main/java/org/solovyev/android/calculator/DummyCalculatorClipboard.java

@@ -0,0 +1,24 @@
+package org.solovyev.android.calculator;
+
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * User: serso
+ * Date: 9/22/12
+ * Time: 2:00 PM
+ */
+public class DummyCalculatorClipboard implements CalculatorClipboard {
+
+    @Override
+    public String getText() {
+        return null;
+    }
+
+    @Override
+    public void setText(@NotNull String text) {
+    }
+
+    @Override
+    public void setText(@NotNull CharSequence text) {
+    }
+}

calculatorpp-core/src/main/java/org/solovyev/android/calculator/DummyCalculatorNotifier.java

@@ -0,0 +1,16 @@
+package org.solovyev.android.calculator;
+
+import org.jetbrains.annotations.NotNull;
+import org.solovyev.common.msg.Message;
+
+/**
+ * User: serso
+ * Date: 9/22/12
+ * Time: 2:00 PM
+ */
+public class DummyCalculatorNotifier implements CalculatorNotifier {
+
+    @Override
+    public void showMessage(@NotNull Message message) {
+    }
+}

calculatorpp-core/src/main/resources/org/solovyev/android/calculator/messages.properties

@@ -6,3 +6,4 @@ msg_5=No parameters are specified for function: {0}
 msg_6=Infinite loop is detected in expression
 
 syntax_error=Error
+result_copied=Result copied to clipboard!

calculatorpp/src/main/java/org/solovyev/android/calculator/AndroidCalculatorClipboard.java

@@ -0,0 +1,43 @@
+package org.solovyev.android.calculator;
+
+import android.app.Application;
+import android.content.Context;
+import android.text.ClipboardManager;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * User: serso
+ * Date: 9/22/12
+ * Time: 1:35 PM
+ */
+public class AndroidCalculatorClipboard implements CalculatorClipboard {
+
+    @NotNull
+    private final Context context;
+
+    public AndroidCalculatorClipboard(@NotNull Application application) {
+        this.context = application;
+    }
+
+    @Override
+    public String getText() {
+        final ClipboardManager clipboard = (ClipboardManager) context.getSystemService(Context.CLIPBOARD_SERVICE);
+        if ( clipboard.hasText() ) {
+            return String.valueOf(clipboard.getText());
+        } else {
+            return null;
+        }
+    }
+
+    @Override
+    public void setText(@NotNull String text) {
+        final ClipboardManager clipboard = (ClipboardManager) context.getSystemService(Context.CLIPBOARD_SERVICE);
+        clipboard.setText(text);
+    }
+
+    @Override
+    public void setText(@NotNull CharSequence text) {
+        final ClipboardManager clipboard = (ClipboardManager) context.getSystemService(Context.CLIPBOARD_SERVICE);
+        clipboard.setText(text);
+    }
+}

calculatorpp/src/main/java/org/solovyev/android/calculator/AndroidCalculatorDisplayView.java

@@ -11,21 +11,11 @@ import android.os.Handler;
 import android.text.Html;
 import android.util.AttributeSet;
 import android.util.Log;
-import jscl.math.Generic;
-import jscl.math.function.Constant;
-import jscl.math.function.IConstant;
 import org.jetbrains.annotations.NotNull;
-import org.solovyev.android.calculator.jscl.JsclOperation;
 import org.solovyev.android.calculator.model.CalculatorEngine;
 import org.solovyev.android.calculator.text.TextProcessor;
-import org.solovyev.android.calculator.view.NumeralBaseConverterDialog;
 import org.solovyev.android.calculator.view.TextHighlighter;
-import org.solovyev.android.menu.LabeledMenuItem;
 import org.solovyev.android.view.AutoResizeTextView;
-import org.solovyev.common.collections.CollectionsUtils;
-
-import java.util.HashSet;
-import java.util.Set;
 
 /**
  * User: serso
@@ -56,9 +46,6 @@ public class AndroidCalculatorDisplayView extends AutoResizeTextView implements
     @NotNull
     private CalculatorDisplayViewState state = CalculatorDisplayViewStateImpl.newDefaultInstance();
 
-    @NotNull
-    private final Object lock = new Object();
-
     @NotNull
     private final Handler handler = new Handler();
 
@@ -91,7 +78,7 @@ public class AndroidCalculatorDisplayView extends AutoResizeTextView implements
     */
 
     public boolean isValid() {
-        synchronized (lock) {
+        synchronized (this) {
             return this.state.isValid();
         }
     }
@@ -101,7 +88,7 @@ public class AndroidCalculatorDisplayView extends AutoResizeTextView implements
         handler.postDelayed(new Runnable() {
             @Override
             public void run() {
-                synchronized (lock) {
+                synchronized (AndroidCalculatorDisplayView.this) {
                     AndroidCalculatorDisplayView.this.state = state;
                     if ( state.isValid() ) {
                         setTextColor(getResources().getColor(R.color.default_text_color));
@@ -120,7 +107,7 @@ public class AndroidCalculatorDisplayView extends AutoResizeTextView implements
     @NotNull
     @Override
     public CalculatorDisplayViewState getState() {
-        synchronized (lock) {
+        synchronized (this) {
             return this.state;
         }
     }

calculatorpp/src/main/java/org/solovyev/android/calculator/AndroidCalculatorEditorView.java

@@ -9,9 +9,8 @@ import android.content.Context;
 import android.content.SharedPreferences;
 import android.graphics.Color;
 import android.os.Build;
-import android.text.Html;
+import android.os.Handler;
 import android.util.AttributeSet;
-import android.util.Log;
 import android.view.ContextMenu;
 import android.widget.EditText;
 import org.jetbrains.annotations.NotNull;
@@ -36,7 +35,12 @@ public class AndroidCalculatorEditorView extends EditText implements SharedPrefe
 	private final static TextProcessor<TextHighlighter.Result, String> textHighlighter = new TextHighlighter(Color.WHITE, true, CalculatorEngine.instance.getEngine());
 
     @NotNull
-    private CalculatorEditorViewState viewState = CalculatorEditorViewStateImpl.newDefaultInstance();
+    private volatile CalculatorEditorViewState viewState = CalculatorEditorViewStateImpl.newDefaultInstance();
+
+    private volatile boolean viewStateChange = false;
+
+    @NotNull
+    private final Handler handler = new Handler();
 
     public AndroidCalculatorEditorView(Context context) {
 		super(context);
@@ -82,7 +86,9 @@ public class AndroidCalculatorEditorView extends EditText implements SharedPrefe
 		menu.removeItem(android.R.id.selectAll);
 	}
 
-	public synchronized void redraw() {
+    // todo serso: fix redraw
+    // Now problem is that calculator editor cursor position might be different than position of cursor in view (as some extra spaces can be inserted fur to number formatting)
+	/*private synchronized void redraw() {
 		String text = getText().toString();
 
 		int selectionStart = getSelectionStart();
@@ -111,7 +117,7 @@ public class AndroidCalculatorEditorView extends EditText implements SharedPrefe
 
 		int length = getText().length();
 		setSelection(Math.max(Math.min(length, selectionStart), 0), Math.max(Math.min(length, selectionEnd), 0));
-	}
+	}*/
 
 	public boolean isHighlightText() {
 		return highlightText;
@@ -119,7 +125,7 @@ public class AndroidCalculatorEditorView extends EditText implements SharedPrefe
 
 	public void setHighlightText(boolean highlightText) {
 		this.highlightText = highlightText;
-		redraw();
+		//redraw();
 	}
 
 	@Override
@@ -134,9 +140,33 @@ public class AndroidCalculatorEditorView extends EditText implements SharedPrefe
 	}
 
     @Override
-    public void setState(@NotNull CalculatorEditorViewState viewState) {
+    public void setState(@NotNull final CalculatorEditorViewState viewState) {
-        this.viewState = viewState;
+        handler.postDelayed(new Runnable() {
-        this.setText(viewState.getText());
+            @Override
-        this.setSelection(viewState.getSelection());
+            public void run() {
+                final AndroidCalculatorEditorView editorView = AndroidCalculatorEditorView.this;
+                synchronized (editorView) {
+                    try {
+                        editorView.viewStateChange = true;
+                        editorView.viewState = viewState;
+                        editorView.setText(viewState.getText());
+                        editorView.setSelection(viewState.getSelection());
+                        //redraw();
+                    } finally {
+                        editorView.viewStateChange = false;
+                    }
+                }
+            }
+        }, 1);
+    }
+
+    @Override
+    protected void onSelectionChanged(int selStart, int selEnd) {
+        synchronized (this) {
+            if (!viewStateChange) {
+                super.onSelectionChanged(selStart, selEnd);
+                CalculatorLocatorImpl.getInstance().getCalculatorEditor().setSelection(selStart);
+            }
+        }
     }
 }

calculatorpp/src/main/java/org/solovyev/android/calculator/AndroidCalculatorNotifier.java

@@ -0,0 +1,27 @@
+package org.solovyev.android.calculator;
+
+import android.app.Application;
+import android.content.Context;
+import android.widget.Toast;
+import org.jetbrains.annotations.NotNull;
+import org.solovyev.common.msg.Message;
+
+/**
+ * User: serso
+ * Date: 9/22/12
+ * Time: 2:00 PM
+ */
+public class AndroidCalculatorNotifier implements CalculatorNotifier {
+
+    @NotNull
+    private final Context context;
+
+    public AndroidCalculatorNotifier(@NotNull Application application) {
+        this.context = application;
+    }
+
+    @Override
+    public void showMessage(@NotNull Message message) {
+        Toast.makeText(context, message.getLocalizedMessage(), Toast.LENGTH_SHORT).show();
+    }
+}

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

@@ -14,14 +14,16 @@ import android.os.Bundle;
 import android.os.IBinder;
 import android.os.Vibrator;
 import android.preference.PreferenceManager;
-import android.text.ClipboardManager;
 import android.text.Html;
 import android.text.method.LinkMovementMethod;
 import android.util.DisplayMetrics;
 import android.util.Log;
 import android.util.TypedValue;
 import android.view.*;
-import android.widget.*;
+import android.widget.Button;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+import android.widget.Toast;
 import jscl.AngleUnit;
 import jscl.NumeralBase;
 import net.robotmedia.billing.BillingController;
@@ -47,9 +49,9 @@ import org.solovyev.android.view.ColorButton;
 import org.solovyev.android.view.drag.*;
 import org.solovyev.common.Announcer;
 import org.solovyev.common.equals.EqualsTool;
+import org.solovyev.common.history.HistoryAction;
 import org.solovyev.common.math.Point2d;
 import org.solovyev.common.text.StringUtils;
-import org.solovyev.common.history.HistoryAction;
 
 import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
@@ -137,7 +139,7 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 		vibrator = (Vibrator) this.getSystemService(VIBRATOR_SERVICE);
 
 		AndroidCalculatorHistoryImpl.instance.load(this, preferences);
-		calculatorModel = CalculatorModel.instance.init(this, preferences, CalculatorEngine.instance);
+		calculatorModel = CalculatorModel.instance.init(this, preferences);
 
 		dpclRegister.clear();
 
@@ -292,7 +294,7 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 
 	private class AngleUnitsChanger implements SimpleOnDragListener.DragProcessor {
 
-		private final DigitButtonDragProcessor processor = new DigitButtonDragProcessor(calculatorModel);
+		private final DigitButtonDragProcessor processor = new DigitButtonDragProcessor(CalculatorLocatorImpl.getInstance().getCalculatorKeyboard());
 
 		@Override
 		public boolean processDragEvent(@NotNull DragDirection dragDirection,
@@ -381,7 +383,7 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 	}
 
     private synchronized void setOnDragListeners(@NotNull SimpleOnDragListener.Preferences dragPreferences, @NotNull SharedPreferences preferences) {
-		final OnDragListener onDragListener = new OnDragListenerVibrator(newOnDragListener(new DigitButtonDragProcessor(calculatorModel), dragPreferences), vibrator, preferences);
+		final OnDragListener onDragListener = new OnDragListenerVibrator(newOnDragListener(new DigitButtonDragProcessor(CalculatorLocatorImpl.getInstance().getCalculatorKeyboard()), dragPreferences), vibrator, preferences);
 
         final List<Integer> dragButtonIds = new ArrayList<Integer>();
         final List<Integer> buttonIds = new ArrayList<Integer>();
@@ -535,12 +537,7 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 
 	@SuppressWarnings({"UnusedDeclaration"})
 	public void eraseButtonClickHandler(@NotNull View v) {
-		calculatorModel.doTextOperation(new CalculatorModel.TextOperation() {
+        CalculatorLocatorImpl.getInstance().getCalculatorEditor().erase();
-			@Override
-			public void doOperation(@NotNull CalculatorEditor editor) {
-				editor.erase();
-			}
-		});
 	}
 
 	@SuppressWarnings({"UnusedDeclaration"})
@@ -560,15 +557,7 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 
 	@SuppressWarnings({"UnusedDeclaration"})
 	public void pasteButtonClickHandler(@NotNull View v) {
-		calculatorModel.doTextOperation(new CalculatorModel.TextOperation() {
+        CalculatorLocatorImpl.getInstance().getCalculatorKeyboard().pasteButtonPressed();
-			@Override
-			public void doOperation(@NotNull CalculatorEditor editor) {
-				final ClipboardManager clipboard = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE);
-				if (clipboard.hasText()) {
-                    editor.insert(String.valueOf(clipboard.getText()));
-				}
-			}
-		});
     }
 
 	@SuppressWarnings({"UnusedDeclaration"})
@@ -578,14 +567,14 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 
 	@SuppressWarnings({"UnusedDeclaration"})
 	public void clearButtonClickHandler(@NotNull View v) {
-		calculatorModel.clear();
+        CalculatorLocatorImpl.getInstance().getCalculatorKeyboard().clearButtonPressed();
 	}
 
 	@SuppressWarnings({"UnusedDeclaration"})
 	public void digitButtonClickHandler(@NotNull View v) {
 		Log.d(String.valueOf(v.getId()), "digitButtonClickHandler() for: " + v.getId() + ". Pressed: " + v.isPressed());
         if (((ColorButton) v).isShowText()) {
-            calculatorModel.processDigitButtonAction(((ColorButton) v).getText().toString());
+            CalculatorLocatorImpl.getInstance().getCalculatorKeyboard().digitButtonPressed(((ColorButton) v).getText().toString());
         }
     }
 
@@ -657,7 +646,7 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 			AndroidUtils.restartActivity(this);
 		}
 
-		calculatorModel = CalculatorModel.instance.init(this, preferences, CalculatorEngine.instance);
+		calculatorModel = CalculatorModel.instance.init(this, preferences);
 		calculatorModel.evaluate();
 	}
 
@@ -753,28 +742,15 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 	private static class RoundBracketsDragProcessor implements SimpleOnDragListener.DragProcessor {
 		@Override
 		public boolean processDragEvent(@NotNull DragDirection dragDirection, @NotNull DragButton dragButton, @NotNull Point2d startPoint2d, @NotNull MotionEvent motionEvent) {
-			boolean result = false;
+			final boolean result;
+
 			if ( dragDirection == DragDirection.left ) {
-				CalculatorModel.instance.doTextOperation(new CalculatorModel.TextOperation() {
+				CalculatorLocatorImpl.getInstance().getCalculatorKeyboard().roundBracketsButtonPressed();
-					@Override
-					public void doOperation(@NotNull CalculatorEditor editor) {
-                        CalculatorEditorViewState viewState = editor.getViewState();
-
-                        final int cursorPosition = viewState.getSelection();
-                        final String oldText = viewState.getText();
-
-                        final StringBuilder newText = new StringBuilder(oldText.length() + 2);
-                        newText.append("(");
-						newText.append(oldText.substring(0, cursorPosition));
-						newText.append(")");
-						newText.append(oldText.substring(cursorPosition));
-						editor.setText(newText.toString(), cursorPosition + 2);
-					}
-				});
 				result = true;
 			} else {
-				result = new DigitButtonDragProcessor(CalculatorModel.instance).processDragEvent(dragDirection, dragButton, startPoint2d, motionEvent);
+				result = new DigitButtonDragProcessor(CalculatorLocatorImpl.getInstance().getCalculatorKeyboard()).processDragEvent(dragDirection, dragButton, startPoint2d, motionEvent);
 			}
+
 			return result;
 		}
 	}

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

@@ -47,6 +47,8 @@ public class CalculatorApplication extends android.app.Application {
 		super.onCreate();
 
         CalculatorLocatorImpl.getInstance().setCalculatorEngine(CalculatorEngine.instance);
+        CalculatorLocatorImpl.getInstance().setCalculatorNotifier(new AndroidCalculatorNotifier(this));
+        CalculatorLocatorImpl.getInstance().setCalculatorClipboard(new AndroidCalculatorClipboard(this));
 
 		AdsController.getInstance().init(ADMOB_USER_ID, AD_FREE_PRODUCT_ID, new BillingController.IConfiguration() {
 

calculatorpp/src/main/java/org/solovyev/android/calculator/CalculatorModel.java

@@ -9,23 +9,17 @@ import android.app.Activity;
 import android.app.AlertDialog;
 import android.content.Context;
 import android.content.SharedPreferences;
-import android.text.ClipboardManager;
 import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.widget.TextView;
-import android.widget.Toast;
 import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
 import org.solovyev.android.CursorControl;
 import org.solovyev.android.calculator.history.AndroidCalculatorHistoryImpl;
 import org.solovyev.android.calculator.history.CalculatorHistoryState;
 import org.solovyev.android.calculator.jscl.JsclOperation;
-import org.solovyev.android.calculator.math.MathType;
-import org.solovyev.android.calculator.model.CalculatorEngine;
 import org.solovyev.android.history.HistoryControl;
 import org.solovyev.common.history.HistoryAction;
-import org.solovyev.common.text.StringUtils;
 
 /**
  * User: serso
@@ -45,17 +39,13 @@ public enum CalculatorModel implements HistoryControl<CalculatorHistoryState>, C
     @NotNull
     private final CalculatorDisplay display;
 
-    @NotNull
-    private CalculatorEngine calculatorEngine;
-
     private CalculatorModel() {
         display = CalculatorLocatorImpl.getInstance().getCalculatorDisplay();
         editor = CalculatorLocatorImpl.getInstance().getCalculatorEditor();
     }
 
-    public CalculatorModel init(@NotNull final Activity activity, @NotNull SharedPreferences preferences, @NotNull CalculatorEngine calculator) {
+    public CalculatorModel init(@NotNull final Activity activity, @NotNull SharedPreferences preferences) {
         Log.d(this.getClass().getName(), "CalculatorModel initialization with activity: " + activity);
-        this.calculatorEngine = calculator;
 
         final AndroidCalculatorEditorView editorView = (AndroidCalculatorEditorView) activity.findViewById(R.id.calculatorEditor);
         editorView.init(preferences);
@@ -66,14 +56,6 @@ public enum CalculatorModel implements HistoryControl<CalculatorHistoryState>, C
         displayView.setOnClickListener(new CalculatorDisplayOnClickListener(activity));
         display.setView(displayView);
 
-        final CalculatorHistoryState lastState = AndroidCalculatorHistoryImpl.instance.getLastHistoryState();
-        if (lastState == null) {
-            saveHistoryState();
-        } else {
-            setCurrentHistoryState(lastState);
-        }
-
-
         return this;
     }
 
@@ -96,62 +78,13 @@ public enum CalculatorModel implements HistoryControl<CalculatorHistoryState>, C
 
     public static void copyResult(@NotNull Context context,
                                   @NotNull final CalculatorDisplayViewState viewState) {
-        if (viewState.isValid()) {
+        CalculatorLocatorImpl.getInstance().getCalculatorKeyboard().copyButtonPressed();
-            final CharSequence text = viewState.getText();
-            if (!StringUtils.isEmpty(text)) {
-                final ClipboardManager clipboard = (ClipboardManager) context.getSystemService(Activity.CLIPBOARD_SERVICE);
-                clipboard.setText(text.toString());
-                Toast.makeText(context, context.getText(R.string.c_result_copied), Toast.LENGTH_SHORT).show();
-            }
-        }
     }
 
     private void saveHistoryState() {
         AndroidCalculatorHistoryImpl.instance.addState(getCurrentHistoryState());
     }
 
-    public void doTextOperation(@NotNull TextOperation operation) {
-        operation.doOperation(CalculatorLocatorImpl.getInstance().getCalculatorEditor());
-    }
-
-    public void processDigitButtonAction(@Nullable final String text) {
-
-        if (!StringUtils.isEmpty(text)) {
-            doTextOperation(new CalculatorModel.TextOperation() {
-
-                @Override
-                public void doOperation(@NotNull CalculatorEditor editor) {
-                    int cursorPositionOffset = 0;
-                    final StringBuilder textToBeInserted = new StringBuilder(text);
-
-                    final MathType.Result mathType = MathType.getType(text, 0, false);
-                    switch (mathType.getMathType()) {
-                        case function:
-                            textToBeInserted.append("()");
-                            cursorPositionOffset = -1;
-                            break;
-                        case operator:
-                            textToBeInserted.append("()");
-                            cursorPositionOffset = -1;
-                            break;
-                        case comma:
-                            textToBeInserted.append(" ");
-                            break;
-                    }
-
-                    if (cursorPositionOffset == 0) {
-                        if (MathType.openGroupSymbols.contains(text)) {
-                            cursorPositionOffset = -1;
-                        }
-                    }
-
-                    editor.insert(textToBeInserted.toString());
-                    editor.moveSelection(cursorPositionOffset);
-                }
-            });
-        }
-    }
-
     @Override
     public void setCursorOnStart() {
         this.editor.setCursorOnStart();
@@ -182,16 +115,6 @@ public enum CalculatorModel implements HistoryControl<CalculatorHistoryState>, C
         CalculatorLocatorImpl.getInstance().getCalculator().evaluate(JsclOperation.simplify, this.editor.getViewState().getText());
     }
 
-    public void clear() {
-        // todo serso:
-    }
-
-    public static interface TextOperation {
-
-        void doOperation(@NotNull CalculatorEditor editor);
-
-    }
-
     @Override
     public void doHistoryAction(@NotNull HistoryAction historyAction) {
         synchronized (AndroidCalculatorHistoryImpl.instance) {

calculatorpp/src/main/java/org/solovyev/android/calculator/DigitButtonDragProcessor.java

@@ -21,16 +21,16 @@ import org.solovyev.common.math.Point2d;
 public class DigitButtonDragProcessor implements SimpleOnDragListener.DragProcessor {
 
     @NotNull
-	private final CalculatorModel calculatorModel;
+    private CalculatorKeyboard calculatorKeyboard;
 
-	public DigitButtonDragProcessor(@NotNull CalculatorModel calculatorModel) {
+    public DigitButtonDragProcessor(@NotNull CalculatorKeyboard calculatorKeyboard) {
-		this.calculatorModel = calculatorModel;
+        this.calculatorKeyboard = calculatorKeyboard;
     }
 
 	@Override
 	public boolean processDragEvent(@NotNull DragDirection dragDirection, @NotNull DragButton dragButton, @NotNull Point2d startPoint2d, @NotNull MotionEvent motionEvent) {
 		assert dragButton instanceof DirectionDragButton;
-		calculatorModel.processDigitButtonAction(((DirectionDragButton) dragButton).getText(dragDirection));
+        calculatorKeyboard.digitButtonPressed(((DirectionDragButton) dragButton).getText(dragDirection));
 		return true;
 	}
 

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

@@ -19,7 +19,7 @@ import com.google.ads.AdView;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.solovyev.android.ads.AdsController;
-import org.solovyev.android.calculator.CalculatorModel;
+import org.solovyev.android.calculator.CalculatorLocatorImpl;
 import org.solovyev.android.calculator.R;
 import org.solovyev.android.calculator.model.AndroidMathRegistry;
 import org.solovyev.android.menu.AMenuBuilder;
@@ -106,7 +106,7 @@ public abstract class AbstractMathEntityListActivity<T extends MathEntity> exten
                                     final int position,
                                     final long id) {
 
-                CalculatorModel.instance.processDigitButtonAction(((MathEntity) parent.getItemAtPosition(position)).getName());
+                CalculatorLocatorImpl.getInstance().getCalculatorKeyboard().digitButtonPressed(((MathEntity) parent.getItemAtPosition(position)).getName());
 
                 AbstractMathEntityListActivity.this.finish();
             }

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

@@ -12,7 +12,7 @@ import android.os.Bundle;
 import android.text.ClipboardManager;
 import jscl.math.function.Function;
 import org.jetbrains.annotations.NotNull;
-import org.solovyev.android.calculator.CalculatorModel;
+import org.solovyev.android.calculator.CalculatorLocatorImpl;
 import org.solovyev.android.calculator.R;
 import org.solovyev.android.calculator.model.CalculatorEngine;
 import org.solovyev.android.menu.LabeledMenuItem;
@@ -33,7 +33,7 @@ public class CalculatorFunctionsActivity extends AbstractMathEntityListActivity<
 		use(R.string.c_use) {
 			@Override
 			public void onClick(@NotNull Function data, @NotNull Context context) {
-				CalculatorModel.instance.processDigitButtonAction(data.getName());
+                CalculatorLocatorImpl.getInstance().getCalculatorKeyboard().digitButtonPressed(data.getName());
 				if (context instanceof Activity) {
 					((Activity) context).finish();
 				}

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

@@ -5,7 +5,7 @@ import android.content.Context;
 import android.text.ClipboardManager;
 import jscl.math.operator.Operator;
 import org.jetbrains.annotations.NotNull;
-import org.solovyev.android.calculator.CalculatorModel;
+import org.solovyev.android.calculator.CalculatorLocatorImpl;
 import org.solovyev.android.calculator.R;
 import org.solovyev.android.calculator.model.CalculatorEngine;
 import org.solovyev.android.menu.LabeledMenuItem;
@@ -28,7 +28,7 @@ public class CalculatorOperatorsActivity extends AbstractMathEntityListActivity<
 		use(R.string.c_use) {
 			@Override
 			public void onClick(@NotNull Operator data, @NotNull Context context) {
-				CalculatorModel.instance.processDigitButtonAction(data.getName());
+                CalculatorLocatorImpl.getInstance().getCalculatorKeyboard().digitButtonPressed(data.getName());
 				if (context instanceof Activity) {
 					((Activity) context).finish();
 				}

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

@@ -21,7 +21,7 @@ import android.widget.Toast;
 import jscl.math.function.IConstant;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
-import org.solovyev.android.calculator.CalculatorModel;
+import org.solovyev.android.calculator.CalculatorLocatorImpl;
 import org.solovyev.android.calculator.R;
 import org.solovyev.android.calculator.math.MathType;
 import org.solovyev.android.calculator.model.CalculatorEngine;
@@ -46,7 +46,7 @@ public class CalculatorVarsActivity extends AbstractMathEntityListActivity<ICons
 		use(R.string.c_use) {
 			@Override
 			public void onClick(@NotNull IConstant data, @NotNull Context context) {
-				CalculatorModel.instance.processDigitButtonAction(data.getName());
+                CalculatorLocatorImpl.getInstance().getCalculatorKeyboard().digitButtonPressed(data.getName());
 				if (context instanceof Activity) {
 					((Activity) context).finish();
 				}

calculatorpp/src/main/java/org/solovyev/android/calculator/view/NumeralBaseConverterDialog.java

@@ -6,14 +6,10 @@ import android.view.View;
 import android.view.WindowManager;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+import org.solovyev.android.calculator.*;
 import org.solovyev.math.units.Unit;
 import org.solovyev.math.units.UnitImpl;
-import org.solovyev.android.calculator.AndroidNumeralBase;
-import org.solovyev.android.calculator.CalculatorModel;
-import org.solovyev.android.calculator.R;
 import org.solovyev.android.calculator.model.CalculatorEngine;
-import org.solovyev.android.calculator.CalculatorParseException;
-import org.solovyev.android.calculator.ToJsclTextProcessor;
 import org.solovyev.common.MutableObject;
 import org.solovyev.common.text.StringUtils;
 
@@ -72,7 +68,7 @@ public class NumeralBaseConverterDialog {
                     toUnitsValue = ((AndroidNumeralBase) toUnits.getUnitType()).getNumeralBase().getJsclPrefix() + toUnitsValue;
                 }
 
-                CalculatorModel.instance.processDigitButtonAction(toUnitsValue);
+                CalculatorLocatorImpl.getInstance().getCalculatorKeyboard().digitButtonPressed(toUnitsValue);
                 final AlertDialog alertDialog = alertDialogHolder.getObject();
                 if (alertDialog != null) {
                     alertDialog.dismiss();