Frame animation - How to know when animation ends?

In related to my earlier post how to use frame animation and implement a circular spinner, i noted a important factor of AnimationDrawable.

I wanted to do some work once the frame animation ends.I looked for animation listener for AnimationDrawable, unfortunately animationDrawable class doesnot have facility to listen for animationlistener object.

SO when googled i found out some suggestions and help in forums. So i am gonna share what i tried out.

1 - We need to calculate the total duration of each frame shown, using getNumberOfFrames() and getDuration() apis.

2 - As soon as the animation is started, Start a timer which will trigger timertask after the total duration. You can conclude now that animation would have ideally stopped. Then you can use stop api to stop the animation.

        animation = new AnimationDrawable();

        animation.addFrame(getResources().getDrawable(R.drawable.gradient_25), 500);
        animation.addFrame(getResources().getDrawable(R.drawable.gradient_50), 500);
        animation.addFrame(getResources().getDrawable(R.drawable.gradient_75), 500);
        animation.addFrame(getResources().getDrawable(R.drawable.gradient_100), 500);
        animation.setOneShot(true); 

        //  Code continues................
        //  Code continues.................

       Button start = (Button ) findViewById(R.id.start);
        start.setOnClickListener(new OnClickListener ()
        {
         public void onClick(View v)
         {
          animation.start();

            long totalDuration = 0;
             for(int i = 0; i< animation.getNumberOfFrames();i++){
              totalDuration += animation.getDuration(i);
             }
             Timer timer = new Timer();

          TimerTask timerTask = new TimerTask(){
              @Override
              public void run() {

                          animation.stop(); 
                                  }
             }};
          timer.schedule(timerTask, totalDuration);
         }
         
        });

Note: Once you call start on animation object, you need to call 'stop()' on the animation object to see the animation again when start() called again. otherwise, animation wont start.