Java tutorial
//package com.java2s; //License from project: Apache License import android.animation.Animator; import android.animation.AnimatorListenerAdapter; import android.animation.ObjectAnimator; import android.view.View; public class Main { private static final long ANIM_DURATION_FADEIN = 200; public static ObjectAnimator fadeIn(final View v) { ObjectAnimator alphaAnim = ObjectAnimator.ofFloat(v, "alpha", 0f, 1f); alphaAnim.setDuration(ANIM_DURATION_FADEIN); alphaAnim.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationStart(Animator animation) { v.setVisibility(View.VISIBLE); } }); return alphaAnim; } }