@Override
                public void onAnimationEnd(Animator animation) {
                    setDotRevealFraction(PendingRevealAnimator.this.dot, 0f);
                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
                        postInvalidateOnAnimation();
                    } else {
                        postInvalidate();
                    }
                }
An Animator that animates a given dot's revealFraction i.e. scales it up
library/src/main/java/com/heinrichreimersoftware/materialintro/view/InkPageIndicator.java