Java tutorial
//package com.java2s; import android.animation.Animator; import android.annotation.SuppressLint; import android.util.Log; import android.view.View; import android.view.ViewAnimationUtils; public class Main { @SuppressLint("NewApi") public static void revealView(View toBeRevealed, View frame) { try { if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) { // get the center for the clipping circle int cx = (frame.getLeft() + frame.getRight()) / 2; int cy = (frame.getTop() + frame.getBottom()) / 2; // get the final radius for the clipping circle int finalRadius = Math.max(frame.getWidth(), frame.getHeight()); Log.v("INFO", "Radius: " + finalRadius); // create the animator for this view (the start radius is zero) Animator anim = ViewAnimationUtils.createCircularReveal(toBeRevealed, cx, cy, 0, finalRadius); // make the view visible and start the animation toBeRevealed.setVisibility(View.VISIBLE); anim.start(); } else { toBeRevealed.setVisibility(View.VISIBLE); } } catch (Exception e) { e.printStackTrace(); } } }