@Override
        public void onAnimationEnd(Animator animation) {
          setDotRevealFraction(PendingRevealAnimator.this.dot, 0f);
          postInvalidateOnAnimation();
        }
An Animator that animates a given dot's revealFraction i.e. scales it up
java/com/google/android/apps/authenticator/howitworks/PagingIndicator.java