开机动画 看图学Android---Android 开发实例教程五

Android实例图解教程目录

http://blog.csdn.net/wyx100/article/details/45061407

在《开发一个新的android界面、界面跳转 看图学Android---Android 开发实例教程三、四》基础完成开机动画，开机界面的图片，在5.5秒内逐渐消失，显示主界面。

只修改StartActivity.java中代码以下部分

StartActivity.java源代码

package com.example.helloword;

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.AnimationSet;
import android.widget.ImageView;

public class StartActivity extends Activity {
	/** Called when the activity is first created. */
	 private final int SPLASH_DISPLAY_LENGHT = 3000; //延迟三秒
	 private ImageView image=null;
	@Override
	public void onCreate(Bundle savedInstanceState) {
	    super.onCreate(savedInstanceState);
	    setContentView(R.layout.start);

        image=(ImageView)findViewById(R.id.imageView1);
        AnimationSet  animationset=new AnimationSet(true);
        AlphaAnimation alphaAnimation=new AlphaAnimation(1, 0);//AlphaAnimation(1, 0)图片逐渐变成透明，1指透明度为0%,0指透明度100%
        alphaAnimation.setDuration(5500);
        animationset.addAnimation(alphaAnimation);
        image.startAnimation(animationset);

	    new Handler().postDelayed(new Runnable(){ 

	        @Override
	        public void run() {
	            Intent mainIntent = new Intent(StartActivity.this,MainActivity.class); //界面跳转定义
	            StartActivity.this.startActivity(mainIntent); //启动界面跳转
	            StartActivity.this.finish(); //界面跳转完成后，消除界面一
	        } 

	       }, SPLASH_DISPLAY_LENGHT); //界面一显示时长
	}

}