按钮按下与松开

android.view.View.OnTouchListener

Interface definition for a callback to be invoked when a touch event is dispatched to this view. The callback will be invoked before the touch event is given to the view.

android.view.MotionEvent

Object used to report movement (mouse, pen, finger, trackball) events. Motion events may hold either absolute or relative movements and other data, depending on the type of device.

View.OnTouchListener buttonListener = new View.OnTouchListener() {    public boolean onTouch(View v, MotionEvent event) {        switch(v.getId()){            case R.id.aleft:                int action = event.getAction();                if (action == MotionEvent.ACTION_DOWN) { // 按下                    sendInfo="aleft";                    sendInfo();                } else if (action == MotionEvent.ACTION_UP) { // 松开                    sendInfo="bleft";                    sendInfo();                }                break;            case R.id.aright:                action = event.getAction();                if (action == MotionEvent.ACTION_DOWN) { // 按下                    sendInfo="aright";                    sendInfo();                } else if (action == MotionEvent.ACTION_UP) { // 松开                    sendInfo="bright";                    sendInfo();                }                break;        }        return false;    }};aleft.setOnTouchListener(buttonListener);forward.setOnTouchListener(buttonListener);