add more Animation APIs and call onAnimationEnd()

Directly calling onAnimationEnd() skips the animation and directly sets
the target values

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

@@ -0,0 +1,7 @@
+package android.view.animation;
+
+public class AlphaAnimation extends Animation {
+
+	public AlphaAnimation(float fromAlpha, float toAlpha) {
+	}
+}

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

@@ -2,4 +2,10 @@ package android.view.animation;
 
 public class Animation {
 
+	public interface AnimationListener {}
+
+	public void setDuration(long durationMillis) {}
+
+	public void setInterpolator(Interpolator i) {}
+
 }

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

@@ -4,4 +4,8 @@ import android.content.Context;
 
 public class AnimationUtils {
 	public static Animation loadAnimation(Context context, int dummy) { return new Animation(); }
+
+	public static long currentAnimationTimeMillis() {
+		return System.currentTimeMillis();
+	}
 }