Android 按键不放连续循环的方法

Question

我有一个按钮，我设置了一个 ontouchlistener 来连续执行一个方法，但是当我按住按钮时，它会在调用 1 次方法后停止执行。

我的方法基本上是从 2 到 4 连续循环。

下面是我的代码 fragment 。

broadcastButton = (Button) findViewById(R.id.broadcastButton);
broadcastButton.setText("Loop");
broadcastButton.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch (event.getAction()) {
                    case MotionEvent.ACTION_DOWN:
                        broadcastmode = 1;
                        schedulePeriodicMethod();
                        try {
                            Thread.sleep(100);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }
                        break;
                    case MotionEvent.ACTION_UP:
                        broadcastmode = 0;
                        stopPeriodicMethod();


                }
                return true;
            }
        });

public void schedulePeriodicMethod() {
        exHandler.postDelayed(execution, 100);
    }

    public void stopPeriodicMethod() {
        exHandler.removeCallbacks(execution);
    }

    private Runnable execution = new Runnable() {
        @Override
        public void run() {
            connectDevice(flag);
            serialSend("C");
            flag++;
            if (flag > 4)
                flag = 2;
        }
    };

需要帮助我哪里做错了程序没有循环

Answer 1

这里是连续循环一个方法的简单方法

//create a handler, override handle message of Handler
    private Handler myHandler = new Handler(){
    @Override
    public void handleMessage(Message msg) {

// do yo stuffs here like UI update etc. 

//create a new message since a message will be consumed once as it       //delivered by handler after the delay
    Message message = new Message();
    message.what = msg.what;
// send the new message with handler
    myHandler.sendMessageDelayed(message, 150);
// 150 is time in milliseconds after which handler will give callback
    }
    };

//让我们在触摸 View 时调用处理程序，将 ontouch 监听器设置为//你想要的 View //在触摸 View 时，创建一条新消息并将其传递给//处理程序

 @Override
    public boolean onTouch(View v, MotionEvent event) {
    switch(event.getAction()){
    case MotionEvent.ACTION_DOWN:
    Message message = new Message();
    myHandler.sendMessage(message);
    break;

// on action up of on touch of the view, remove the messages and call backs
//case MotionEvent.ACTION_UP:
    myHandler.removeCallbacksAndMessages(null);
    break;
    }
    return false;
    }