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;

 import java.util.Timer;
 import java.util.TimerTask;
 import android.app.Activity;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Message;
 public class HandlerDemo extends Activity {  

     //title为setTitle方法提供变量,这里为了方便我设置成了int型
     private int title = 0;
    private Handler mHandler = new Handler(){ 
         public void handleMessage(Message msg) { 
             switch (msg.what) { 
             case 1: 
                 updateTitle(); 
                 break; 
             } 
         }; 
     };
    public void onCreate(Bundle savedInstanceState) { 
         super.onCreate(savedInstanceState); 
         setContentView(R.layout.main); 
   
         Timer timer = new Timer(); 
       timer.scheduleAtFixedRate(new MyTask(), 1, 5000);  
     } 
   
     private class MyTask extends TimerTask{ 
         @Override 
         public void run() { 
  　　　　//处理事情
             Message message = new Message(); 
             message.what = 1; 
             mHandler.sendMessage(message);
   
         }    
     } 
   
   
     public void updateTitle(){ 
   
         setTitle("Welcome to Mr Wei's blog " + title); 
         title ++; 
     } 
 }