api-impl: add stubs to make AnimationDrawable and Animation not cause lockups

apps may (ab)use AnimationDrawable.run and Animation.setAnimationListener
to time transitions between states; even though we don't currently implement
the animations, state transitions are still desirable (otherwise the app may
lock up)

src/api-impl/android/graphics/drawable/AnimationDrawable.java

@@ -1,7 +1,21 @@
 package android.graphics.drawable;
 
 public class AnimationDrawable extends Drawable {
-	public void addFrame(Drawable drawable, int dummy) {}
-	public void start() {}
+	private int num_frames = 0;
+
+	public int getNumberOfFrames() {
+		return num_frames;
+	}
+
+	public void addFrame(Drawable drawable, int duration) {
+		num_frames++;
+	}
+	public void start() {
+		for(int i = 0; i < num_frames; i++) {
+			run();
+		}
+	}
 	public void stop() {}
+
+	public void run() {}
 }

src/api-impl/android/hardware/SensorManager.java

@@ -35,6 +35,10 @@ public class SensorManager {
 		}
 	}
 
+	public void unregisterListener(final SensorEventListener listener) {
+		unregisterListener(listener, null);
+	}
+
 	public void unregisterListener(final SensorEventListener listener, Sensor sensor) {
 		System.out.println("STUB: andoroid.hw.SensorManager.unregisterListener");
 	}

src/api-impl/android/view/animation/Animation.java

@@ -2,7 +2,11 @@ package android.view.animation;
 
 public class Animation {
 
-	public interface AnimationListener {}
+	public interface AnimationListener {
+		public void onAnimationEnd(Animation animation);
+		public void onAnimationRepeat(Animation animation);
+		public void onAnimationStart(Animation animation);
+	}
 
 	public void setDuration(long durationMillis) {}
 
@@ -12,4 +16,10 @@ public class Animation {
 
 	public void setFillBefore(boolean dummy) {}
 	public void setFillAfter(boolean dummy) {}
+
+	public void setStartOffset(long offset) {}
+
+	public void setAnimationListener(AnimationListener l) {
+		l.onAnimationEnd(this); // FIXME
+	}
 }

src/api-impl/android/widget/ImageView.java

@@ -13,7 +13,7 @@ import android.view.View;
 
 public class ImageView extends View {
 
-	private Bitmap bitmap;
+	private Bitmap bitmap = null;
 	private ScaleType scaleType = ScaleType.FIT_CENTER;
 
 	public ImageView(Context context, AttributeSet attrs) {
@@ -61,6 +61,9 @@ public class ImageView extends View {
 	}
 
 	public Drawable getDrawable() {
+		if(bitmap == null)
+			return null;
+
 		return new BitmapDrawable(getContext().getResources(), bitmap);
 	}