9. Message&Handler

1. 新建线程，在其中新建Handler类用于处理消息。

private final class MyThread implements Runnable{

@Override

public void run() {

Looper.prepare();

childHandler = new Handler(){

//处理消息

@Override

public void handleMessage(Message msg) {

if(msg.what == SETCHILD){

lblThreadChildShow.setText("子线程说："+msg.obj.toString());

}

}

};

Looper.loop();

}

}

2. 在按钮的点击事件中新建Message并通过上面新建的Handler进行发送

private final class threatStartClickListener implements View.OnClickListener{

@Override

public void onClick(View v) {

if(childHandler != null){

Message msg = childHandler.obtainMessage();

msg.obj = "主线程向子线程发送：你是傻逼";

msg.what = SETCHILD;

childHandler.sendMessage(msg);//发送消息

}

}

}

3. 开启线程即可

new Thread(new MyThread(), "child thread");