Simulate Long press by Touch events

问题

How can we simulate long press by touch event? or how can we calculate the time that screen is touched, all in ACTION_DOWN state?

回答1:

I have implemented a Touch screen long click finally , thx all:

textView.setOnTouchListener(new View.OnTouchListener() {

    private static final int MIN_CLICK_DURATION = 1000;
    private long startClickTime;

    @Override
    public boolean onTouch(View v, MotionEvent event) {

        switch (event.getAction()) {
        case MotionEvent.ACTION_UP:
            longClickActive = false;
            break;
        case MotionEvent.ACTION_DOWN:
            if (longClickActive == false) {
                longClickActive = true;
                startClickTime = Calendar.getInstance().getTimeInMillis();
            }
            break;
        case MotionEvent.ACTION_MOVE:
            if (longClickActive == true) {
                long clickDuration = Calendar.getInstance().getTimeInMillis() - startClickTime;
                if (clickDuration >= MIN_CLICK_DURATION) {
                    Toast.makeText(MainActivity.this, "LONG PRESSED!",Toast.LENGTH_SHORT).show();
                    longClickActive = false;
                }
            }
            break;
        }
        return true;
    }
});

in which private boolean longClickActive = false; is a class variable.

回答2:

For calculating touch count you can get getPointerCount() of your event like here

and for Long click maybe this helps

Edit: and hope this link help you determining getting touch duration

回答3:

You have to count time between ACTION_DOWN and ACTION_UP events. It's impossible to calculate this time only in ACTOIN_DOWN state, cause it's the START event of sequence of events representing TAP of LONG TAP event

回答4:

Try this. You don't need to find hack for this.

final GestureDetector gestureDetector = new GestureDetector(new GestureDetector.SimpleOnGestureListener() {
 public void onLongPress(MotionEvent e) {
  Log.e("", "Longpress detected");
 }
});

public boolean onTouchEvent(MotionEvent event) {
 if (gestureDetector.onTouchEvent(event)) {
  return true;
 }
 switch (event.getAction()) {
  case MotionEvent.ACTION_UP:
   break;
  case MotionEvent.ACTION_DOWN:
   break;
  case MotionEvent.ACTION_MOVE:
   break;
 }
 return true;
}
};

来源：https://stackoverflow.com/questions/17896168/simulate-long-press-by-touch-events

标签

android

event-handling

touch-event

long-press