捕获Android帧动画的结束事件

/**
* 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;

public CustomAnimationDrawable(AnimationDrawable aniDrawable) {
// TODO Auto-generated constructor stub
for(int i=0;i {
this.addFrame(aniDrawable.getFrame(i), aniDrawable.getDuration(i));
}
}

/*
* 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));
stop();
}
}

/*
* 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;
}

}

and I use this class like this,

private void registerAnimation(int id, final Runnable cb)
{
final ImageView imgView = (ImageView)findViewById(id);
final CustomAnimationDrawable aniDrawable = new CustomAnimationDrawable((AnimationDrawable)imgView.getBackground());
imgView.setBackgroundDrawable(aniDrawable.getFrame(0));

aniDrawable.setOnFinishCallback(cb);

imgView.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(!aniDrawable.isRunning())
{
v.setBackgroundDrawable(aniDrawable);
aniDrawable.start();
}
}
});
}