handler发消息的形式

Posted 2020-07-11 构建巨人肩膀

1、onCreate()中写好handler的接受机制，准备接受并处理消息

2、thread中利用handler.post(Runnable r):

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textView = (TextView) findViewById(R.id.text);
        handler = new Handler();
//        new myHandlerThread(handler).start();
        new myHandlerThread2(handler).start();
    }


    class myHandlerThread2 extends Thread {
        private Handler handler;

        public myHandlerThread2(Handler handler) {
            // TODO Auto-generated constructor stub
            this.handler = handler;
        }

        @Override
        public void run() {
            // TODO Auto-generated method stub
            super.run();
            handler.post(new Runnable() {
                
                @Override
                public void run() {
                    // TODO Auto-generated method stub
                    textView.setText("myHandlerThread2");
                }
            });
        }
    }