Android开源框架：NineOldAndroid

 1 //NineOldAndroid
 2 private static class AnimationHandler extends Handler{
 3         public void handlerMessage(){
 4         ....
 5         sendEmptyMessageDelayed(...);
 6         }
 7 
 8 
 9 //Android系统
10 protected static class AnimationHandler implements Runnable {
11         // The per-thread list of all active animations
12         /** @hide */
13         protected final ArrayList<ValueAnimator> mAnimations = new ArrayList<ValueAnimator>();
14 
15         // Used in doAnimationFrame() to avoid concurrent modifications of mAnimations
16         private final ArrayList<ValueAnimator> mTmpAnimations = new ArrayList<ValueAnimator>();
17 
18         // The per-thread set of animations to be started on the next animation frame
19         /** @hide */
20         protected final ArrayList<ValueAnimator> mPendingAnimations = new ArrayList<ValueAnimator>();
21 
22         /**
23          * Internal per-thread collections used to avoid set collisions as animations start and end
24          * while being processed.
25          * @hide
26          */
27         protected final ArrayList<ValueAnimator> mDelayedAnims = new ArrayList<ValueAnimator>();
28         private final ArrayList<ValueAnimator> mEndingAnims = new ArrayList<ValueAnimator>();
29         private final ArrayList<ValueAnimator> mReadyAnims = new ArrayList<ValueAnimator>();
30 
31         private final Choreographer mChoreographer;
32         .....
33         }