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);
         }
     }

 }