private Handler mHandler_2;

/**

* 寒天星之线程基础篇

*/

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

//实例化线程，在handler中规定什么情况触发什么

MyThread_2 thread_2 = new MyThread_2();

thread_2.start();

//这里的newMsg就像一个发消息的入口将情况发给handler让handler进行处理

Message newMsg = Message.obtain();

newMsg.what = 1;

mHandler_2.sendMessage(newMsg);

}

public class MyThread_2 extends Thread {

@Override

public void run() {

Looper.prepare();

mHandler_2 = new Handler() {

public void handleMessage(Message msg) {

switch (msg.what) {

case 1:

Toast.makeText(MainActivity.this, "出来了", 1).show();

break;

case 2:

break;

default:

break;

}

}

};

Looper.loop();

}

}