Android实现应用程序的闪屏效果

<?xml version="1.0" encoding="utf-8"? 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:background="@drawable/bg_app"
 android:orientation="vertical"  
</LinearLayout 

package com.example.bamboo_splash;
 
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
 
public class WelcomeActivity extends Activity {
 
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_welcome);
 /** 方式一*/
// AlphaAnimation animation=new AlphaAnimation(0.3f, 1f);
// animation.setDuration(3000);
// animation.setAnimationListener(new AnimationListener() {
// 
// @Override
// public void onAnimationStart(Animation animation) {
// 
// }
// 
// @Override
// public void onAnimationRepeat(Animation animation) {
// 
// }
// /** 动画结束执行的方法*/
// @Override
// public void onAnimationEnd(Animation animation) {
// redirectTo();
// }
// });
 
 /** 方式二*/
 new Handler().postDelayed(new Runnable() {
 
 @Override
 public void run() {
 redirectTo();
 }
 }, 3000);
 }
 /**
 * 即将跳转的页面
 */
 public void redirectTo(){
 Intent intent=new Intent(WelcomeActivity.this, MainActivity.class);
 startActivity(intent);
 finish();
 }
}