Sub Thread to update main Thread (UI)

 1 import java.util.Timer;  
 2 import java.util.TimerTask;  
 3 import android.app.Activity;  
 4 import android.os.Bundle;  
 5 import android.os.Handler;  
 6 import android.os.Message;  
 7 public class HandlerDemo extends Activity {  
 8   
 9     //title为setTitle方法提供变量,这里为了方便我设置成了int型  
10     private int title = 0;  
11    private Handler mHandler = new Handler(){  
12         public void handleMessage(Message msg) {  
13             switch (msg.what) {  
14             case 1:  
15                 updateTitle();  
16                 break;  
17             }  
18         };  
19     };  
20    public void onCreate(Bundle savedInstanceState) {  
21         super.onCreate(savedInstanceState);  
22         setContentView(R.layout.main);  
23   
24         Timer timer = new Timer();  
25       timer.scheduleAtFixedRate(new MyTask(), 1, 5000);   
26     }  
27   
28     private class MyTask extends TimerTask{  
29         @Override 
30         public void run() {  
31  　　　　//处理事情
32             Message message = new Message();  
33             message.what = 1;  
34             mHandler.sendMessage(message); 
35   
36         }     
37     }  
38   
39   
40     public void updateTitle(){  
41   
42         setTitle("Welcome to Mr Wei‘s blog " + title);  
43         title ++;  
44     }  
45 }