Android LayoutAnimationController：如何强制第一个孩子在重复之前等待最后一个孩子的动画完成？

* This class is a hack to simply get an on finish callBACk for an
* AnimationDrawable.
*
*/
public class CustomAnimationDrawable extends AnimationDrawable {
// We need to keep our own frame count because mCurFrame in AnimationDrawable is private
privatE int mCurFrameHack = -1;

// This is the Runnable that we will call when the animation finishes
private Runnable mCallBACk = null;

/*
* We override the run method in order to increment the frame count the same
* way the AnimationDrawable class does. Also,when we are on the last frame we
* schedule our callBACk to be called after the duration of the last frame.
*/
@Override
public void run() {
super.run();

mCurFrameHack += 1;
if (mCurFrameHack == (getnumberOfFrames() - 1) && mCallBACk != null) {
scheduleSelf(mCallBACk,SystemClock.uptimeMillis() + getDuration(mCurFrameHack));
}
}

/*
* We override this method simply to reset the frame count just as is done in
* AnimationDrawable.
*/
@Override
public void unscheduleSelf(Runnable what) {
// TODO Auto-generated method stub
super.unscheduleSelf(what);
mCurFrameHack = -1;
}

public void setOnFinishCallBACk(Runnable callBACk) {
mCallBACk = callBACk;
}

public Runnable getOnFinishCallBACk() {
return mCallBACk;
}

}

在我的代码中我使用它像：

CustomAnimationDrawable staticAnimation = new CustomAnimationDrawable();
    //add frames with resources and duration. step is just a class of mine
        staticAnimation.addFrame(getresources().getDrawable(step.getStepImageResId()),step.getStepDuration());
    staticAnimation.addFrame(getresources().getDrawable(step.getStepImageResId()),step.getStepDuration());
        staticAnimation.setOneshot(false);

        imgView.setBACkgroundDrawable(staticAnimation);
staticAnimation.start();

可能不是最好的解决方案,但它符合我的需求.