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 ++;
}
}