CircularRevealActivity.java

/*
  create a new circular reaveal on the give view. This view is initially invisible. In this case the view covers full screen
*/
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
    private void createCircularReveal(final View view) {

        // to get the center of FAB 
        int centerX = (int) mFab.getX() + mFab.getWidth() / 2;
        int centerY = (int) mFab.getY();
        float finalRadius = (float) Math.hypot(view.getWidth(), view.getHeight());
        // starts the effect at centerX, center Y and covers final radius
        Animator revealAnimator = ViewAnimationUtils.createCircularReveal(view,
                centerX, centerY, 0, finalRadius);
        view.setVisibility(View.VISIBLE);
        revealAnimator.start();

    }

/*
    hides the circular view
*/

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
    private void hideCircularReveal(final View myView) {

        // get the center for the clipping circle
        int cx = (int) mFab.getX() + mFab.getWidth() / 2;
        int cy = (int) mFab.getY();


        // get the initial radius for the clipping circle
        float initialRadius = (float) Math.hypot(myView.getWidth(), myView.getHeight());

        // create the animation (the final radius is zero)
        Animator anim =
                ViewAnimationUtils.createCircularReveal(myView, cx, cy, initialRadius, 0);

        // make the view invisible when the animation is done
        anim.addListener(new Animator.AnimatorListener() {
            @Override
            public void onAnimationStart(Animator animation) {

            }

            @Override
            public void onAnimationEnd(Animator animation) {
                myView.setVisibility(View.INVISIBLE);

            }

            @Override
            public void onAnimationCancel(Animator animation) {

            }

            @Override
            public void onAnimationRepeat(Animator animation) {

            }
        });
        // start the animation
        anim.start();
    }