Sub Thread to update main Thread (UI)

Sub Thread to update main Thread (UI)

main Thread :   A  has Hander.HandleMessage() to process the "Msg" from subthread B;

Sub Thread :    B  use  Hander.sendMessage(Msg)  to main Thread A;

 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 }