@Override
                public void onAnimationUpdate(ValueAnimator valueAnimator) {
                    setDotRevealFraction(PendingRevealAnimator.this.dot,
                            (Float) valueAnimator.getAnimatedValue());
                }
An Animator that animates a given dot's revealFraction i.e. scales it up
library/src/main/java/com/heinrichreimersoftware/materialintro/view/InkPageIndicator.java