Fix for not responsive home screen widget

If the app is killed the widget doesn't receive updates
and it keeps the old value of the editor.
Pressing f.e. cursor buttons in such case
has not effect as real editor is empty and no
"editor change" events are triggered, thus,
widget is not updated.

To solve the issue let's just update the widget
any time its buttons are pressed.

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

@@ -69,6 +69,9 @@ public final class App {
 
 	private static volatile boolean initialized;
 
+	@Nonnull
+	private static CalculatorBroadcaster broadcaster;
+
 	private App() {
 		throw new AssertionError();
 	}
@@ -104,6 +107,7 @@ public final class App {
 				App.locator = new ServiceLocator() {
 				};
 			}
+			App.broadcaster = new CalculatorBroadcaster(application);
 
 			App.initialized = true;
 		} else {
@@ -163,4 +167,9 @@ public final class App {
 		checkInit();
 		return eventBus;
 	}
+
+	@Nonnull
+	public static CalculatorBroadcaster getBroadcaster() {
+		return broadcaster;
+	}
 }

android-app-core/src/main/java/org/solovyev/android/calculator/CalculatorBroadcaster.java

@@ -32,15 +32,15 @@ public final class CalculatorBroadcaster implements CalculatorEventListener {
 		}
 	}
 
-	private void sendDisplayStateChanged() {
+	public void sendDisplayStateChanged() {
 		sendBroadcastIntent(ACTION_DISPLAY_STATE_CHANGED);
 	}
 
-	private void sendEditorStateChangedIntent() {
+	public void sendEditorStateChangedIntent() {
 		sendBroadcastIntent(ACTION_EDITOR_STATE_CHANGED);
 	}
 
-	private void sendBroadcastIntent(@Nonnull String action) {
+	public void sendBroadcastIntent(@Nonnull String action) {
 		context.sendBroadcast(new Intent(action));
 	}
 }

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

@@ -22,6 +22,8 @@ public final class CalculatorReceiver extends BroadcastReceiver {
 			if (button != null) {
 				button.onClick(context);
 			}
+
+			App.getBroadcaster().sendEditorStateChangedIntent();
 		}
 	}