Handler主线程和子线程相通信

//创建主线程的handler
private Handler handler = new Handler(){
    @Override
    public void handleMessage(Message msg) {
        threadHandler.sendEmptyMessage(1);
    }
};
private Button button1 ,button2;
private HandlerThread handlerThread;
private Handler threadHandler;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    button1 = findViewById(R.id.send);
    button2 = findViewById(R.id.stop);
    //子线程的handler的创建
    handlerThread = new HandlerThread("HandlerThread");
    handlerThread.start();
    threadHandler = new Handler(handlerThread.getLooper()){
        @Override
        public void handleMessage(Message msg) {
            Log.i("TAG", "Thread---handleMessage: ");
            handler.sendEmptyMessage(1);
        }
    };

}

@Override
public void onClick(View v) {
    switch (v.getId()){
        case R.id.send:
            handler.sendEmptyMessage(1);
            break;
        case  R.id.stop:
            handler.removeMessages(1);
            break;
    }
}