How to implement double tap for surface view in android

Question

Please tell how to implement double tap for SurfaceView in Android using gesture detector. Can anybody provide code example?

Answer 1

You could try following.. actually i tested this and it works pretty well:

1) Extend GestureDetector.SimpleOnGestureListener and override it's onDoubleTap() method:

    class DoubleTapGestureDetector extends GestureDetector.SimpleOnGestureListener {

        @Override
        public boolean onDoubleTap(MotionEvent e) {
            Log.d("TAG", "Double Tap Detected ...");
            return true;
        }

    }

2) Instantiate the GestureDetector:

final GestureDetector mGesDetect = new GestureDetector(this, new DoubleTapGestureDetector());

3) Set an OnTouchListener on your SurfaceView, override its onTouch() method and call the onTouchEvent() on your GestureDetector object:

    surfview.setOnTouchListener(new OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            mGesDetect.onTouchEvent(event);
            return true;
        }
    });

Answer 2

I have tried above solution. But, it didn't work for my case. I got the touch event in surface view touch listener, but didn't find any callback either in onDoubleTap or onSingleTapConfirmed methods. My Code is given below:

final GestureDetector gestureDetector = new GestureDetector(this, new GestureDetector.SimpleOnGestureListener(){
        @Override
        public boolean onDoubleTap(MotionEvent e) {
            // code here
            return super.onDoubleTap(e);
        }

        @Override
        public boolean onSingleTapConfirmed(MotionEvent e) {
            // code here
            return super.onSingleTapConfirmed(e);
        }

    });

surfaceView.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            return gestureDetector.onTouchEvent(event);
        }
    });

When I made the surface view clickable, it worked.

 surfaceView.setClickable(true);

Detailed explanation can be found in this link