CODEWITHSUNDEEP
androidtouchontouchlistener
c0nstan
c0nstan

Reputation: 53

Android Touch Problems

i have a SurfaceView and i want to recognize the MotionEvent Action_Up, but only the Action_Down event is triggered. Also i want to recognize another touch, while the first finger is still on the screen, but the OnTouch Event isnt triggered again.

@Override
public boolean onTouch(View arg0, MotionEvent event) {
    int pointerCount = event.getPointerCount();
    if (event.getAction() == android.view.MotionEvent.ACTION_DOWN) {
        //blabla
    } else /* if (event.getAction() == android.view.MotionEvent.ACTION_UP) */{
        //blabla
    }
    return false;
}

@Override
public boolean onTouchEvent(MotionEvent event) {
    int pointerCount = event.getPointerCount();
    if (event.getAction() == android.view.MotionEvent.ACTION_DOWN) {
        //blabla
    } else /* if (event.getAction() == android.view.MotionEvent.ACTION_UP) */{
        //blabla
    }
    return super.onTouchEvent(event);
}

The pointerCount is always 1, no matter how many fingers are on the screen.

Upvotes: 2

Views: 1378

Answers (2)

Andrew T.
Andrew T.

Reputation: 2108

Try capturing the getAction in a variable instead of calling it multiple times in your onTouch. Also make sure you're letting the listener know when the action is consumed. 

    public boolean onTouch(View v, MotionEvent event) {
            final int action = event.getAction();
            boolean consumed = false;
            switch(action){
                    case MotionEvent.ACTION_DOWN:
                    //down stuff logic
                            consumed = true;
                    break;
                    case MotionEvent.ACTION_UP:
                    //up stuff logic
                            consumed = true;
                    break;
                    case MotionEvent.ACTION_MOVE:
                    //move stuff logic
                            consumed = true;
                    break;
            }
            return consumed;
    }

As for number of fingers on the screen, remember multitouch support started at API level 5, so depending on your phone/minSDK you might not have it.

Upvotes: 0

devunwired
devunwired

Reputation: 63293

You must return true for an ACTION_DOWN event in your OnTouchListener if you are interested in being notified of the remaining events associated with that touch (ACTION_MOVE, ACTION_UP, etc.)

I would also recommend EITHER monitoring the touches using a listener OR in the onTouchEvent method of the view...not both.

HTH

Upvotes: 1

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