AndroidUIThreadDelays.java

private final Handler uiHandler = new Handler(Looper.getMainLooper());

private void startAnimation() {

    animateBallRestart(firstBall);

    uiHandler.postDelayed(new Runnable() {
        @Override
        public void run() {
            animateBallRestart(secondBall);

            uiHandler.postDelayed(new Runnable() {
                @Override
                public void run() {
                    animateBallRestart(thirdBall);
                }
            }, Constants.ANIMATION_DELAY_MILLIS);
        }
    }, Constants.ANIMATION_DELAY_MILLIS);
}

@Override
public void onDestroyView() {
    super.onDestroyView();

    // Cancels any currently queued calls to Handler.postDelayed
    uiHandler.removeCallbacksAndMessages(null);
}