Android電視關閉的動畫效果

老式電視機關閉的時候畫面一閃消失的那個效果：

首先創建一個TVOffAnimation繼承於Animation：

1. import Android.graphics.Matrix;
2. import android.view.animation.AccelerateDecelerateInterpolator;
3. import android.view.animation.Animation;
4. import android.view.animation.Transformation;
6. public class TVOffAnimation extends Animation {
8. private int halfWidth;
9. private int halfHeight;
11. @Override
12. public void initialize(int width, int height, int parentWidth,
13. int parentHeight) {
15. super.initialize(width, height, parentWidth, parentHeight);
16. setDuration(500);
17. setFillAfter(true);
18. //保存View的中心點
19. halfWidth = width / 2;
20. halfHeight = height / 2;
21. setInterpolator(new AccelerateDecelerateInterpolator());
23. }
25. @Override
26. protected void applyTransformation(float interpolatedTime, Transformation t) {
28. final Matrix matrix = t.getMatrix();
29. if (interpolatedTime < 0.8) {
30. matrix.preScale(1+0.625f*interpolatedTime, 1-interpolatedTime/0.8f+0.01f,halfWidth,halfHeight);
31. }else{
32. matrix.preScale(7.5f*(1-interpolatedTime),0.01f,halfWidth,halfHeight);
33. }
34. }
35. }