Android编程之消息机制实例分析

button.setOnClickListener(this); text = (TextView)findViewById(R.id.content);

} public void onClick(View v) {

switch (v.getId()) { case R.id.btn:

thread = new MyThread(); thread.start();

break; }

} private class MyHandler extends Handler{

public MyHandler(Looper looper){ super(looper);

} @Override

public void handleMessage(Message msg) {//处理消息 text.setText(msg.obj.toString());

} }

private class MyThread extends Thread{ @Override

public void run() { Looper curLooper = Looper.myLooper();

Looper mainLooper = Looper.getMainLooper(); String msg ;

if(curLooper==null){ mHandler = new MyHandler(mainLooper);

msg = "curLooper is null"; }else{

mHandler = new MyHandler(curLooper); msg = "This is curLooper";

} mHandler.removeMessages(0);

Message m = mHandler.obtainMessage(1, 1, 1, msg); mHandler.sendMessage(m);

} }