Java tutorial
//package com.java2s; //License from project: Apache License import android.animation.Animator; import android.annotation.TargetApi; import android.view.View; import android.view.ViewAnimationUtils; import android.view.animation.AccelerateInterpolator; public class Main { private static final AccelerateInterpolator mAccelerateInterpolator = new AccelerateInterpolator(); @TargetApi(21) public static Animator circleReveal(View v, int centerX, int centerY, float startRadius, float endRadius, int duration) { Animator anim = ViewAnimationUtils.createCircularReveal(v, centerX, centerY, startRadius, endRadius); anim.setDuration(duration); anim.setInterpolator(mAccelerateInterpolator); anim.start(); return anim; } }