使用Handler跟Timer+Timertask实现简单的图片轮播

 1 package com.example.administrator.handlerthreadmessagedemo; 2  3 import android.app.Activity; 4 import android.os.Bundle; 5 import android.os.Handler; 6 import android.os.Message; 7 import android.widget.ImageView; 8 import android.widget.TextView; 9 import java.util.Timer;10 11 12 public class MainActivity extends Activity  {13 14     private int images[] = new int[]{R.drawable.image1,R.drawable.image2,R.drawable.image3};  //存放图片15 16     private ImageView imageView;17     private int index = 0;   //计算18     private TextView textView;19     private Timer timer = new Timer();20     private Timertask timertask;21 22 23 24     @Override25     protected void onCreate(Bundle savedInstanceState) {26 27         super.onCreate(savedInstanceState);28         setContentView(R.layout.activity_main);29         imageView = (ImageView) findViewById(R.id.imageView);30         textView = (TextView) findViewById(R.id.title);31         timertask = new Timertask();   //放回到Timer中32         timer.schedule(timertask,0,1000);  //使用Timer 每隔1秒发送一次空消息33     }34 35     private Handler  mhandler = new Handler(){36         @Override37         public void handleMessage(Message msg) {38             super.handleMessage(msg);39             if(msg.what == 0x111){40                 index++;41                 imageView.setBackgroundResource(images[index % 3]);42             }43         }44     };45 46     class Timertask extends java.util.TimerTask{47 48         @Override49         public void run() {50             mhandler.sendEmptyMessage(0x111);51         }52     }53 54 }