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 ++;  
    }  
}