使用Handler和Timer+Timertask实现简单的图片轮播

布局文件就只放了一个简单的ImageView，就不展示了。

下面是Activity

 package com.example.administrator.handlerthreadmessagedemo;

 import android.app.Activity;

 import android.os.Bundle;

 import android.os.Handler;

 import android.os.Message;

 import android.widget.ImageView;

 import android.widget.TextView;

 import java.util.Timer;

 public class MainActivity extends Activity  {

     private int images[] = new int[]{R.drawable.image1,R.drawable.image2,R.drawable.image3};  //存放图片

     private ImageView imageView;

     private int index = 0;   //计算

     private TextView textView;

     private Timer timer = new Timer();

     private Timertask timertask;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         imageView = (ImageView) findViewById(R.id.imageView);

         textView = (TextView) findViewById(R.id.title);

         timertask = new Timertask();   //放回到Timer中

         timer.schedule(timertask,0,1000);  //使用Timer 每隔1秒发送一次空消息

     }

     private Handler  mhandler = new Handler(){

         @Override

         public void handleMessage(Message msg) {

             super.handleMessage(msg);

             if(msg.what == 0x111){

                 index++;

                 imageView.setBackgroundResource(images[index % 3]);

             }

         }

     };

     class Timertask extends java.util.TimerTask{

         @Override

         public void run() {

             mhandler.sendEmptyMessage(0x111);

         }

     }

 }