Question

I am using the answer from Mohan at DoubleTap in android But I dont know How to implement it.

I have a webView and I want to detect swipe from left and right and double tap. How could I implement both at a time.Please help I am new to gestures.

Answer 1

Try this,

private GestureDetector gestureDetector;
View.OnTouchListener gestureListener;

gestureDetector = new GestureDetector(new MyGestureDetector());
    gestureListener = new View.OnTouchListener() {
        public boolean onTouch(View v, MotionEvent event) {
            if (gestureDetector.onTouchEvent(event)) {
                return true;
            }
            return false;
        }
    };

MyGestureDetector

class MyGestureDetector extends SimpleOnGestureListener {
    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
            float velocityY) {
        try {
            if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
                return false;
            // right to left swipe
            if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE
                    && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {

// your code

            } else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE
                    && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {

// your code

            }
        } catch (Exception e) {
            Log.e(LOG_TAG, "onFling", e);

        }
        return false;
    }
}

By checking swipe distance, you can differentiate touch and swipe somehow. I hope this will help you.