OnSwipeListener.java

package org.edx.mobile.view;

import android.annotation.SuppressLint;
import android.content.Context;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;

@SuppressLint("ClickableViewAccessibility")
public class OnSwipeListener implements OnTouchListener {

    private final GestureDetector gestureDetector;

    public OnSwipeListener(Context context) {
        gestureDetector = new GestureDetector(context, new GestureListener());
    }
    
    public void onClick() {
    }

    public void onSwipeLeft() {
    }

    public void onSwipeRight() {
    }

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

    private final class GestureListener extends SimpleOnGestureListener {

        private static final int SWIPE_DISTANCE_THRESHOLD = 100;
        private static final int SWIPE_VELOCITY_THRESHOLD = 100;

        @Override
        public boolean onDown(MotionEvent e) {
            return true;
        }
        
        @Override
        public boolean onSingleTapConfirmed(MotionEvent e) {
            onClick();
            return super.onSingleTapConfirmed(e);
        }

        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
                float velocityY) {
            float distanceX = e2.getX() - e1.getX();
            float distanceY = e2.getY() - e1.getY();
            if (Math.abs(distanceX) > Math.abs(distanceY)
                    && Math.abs(distanceX) > SWIPE_DISTANCE_THRESHOLD
                    && Math.abs(velocityX) > SWIPE_VELOCITY_THRESHOLD) {
                if (distanceX > 0)
                    onSwipeRight();
                else
                    onSwipeLeft();
                return true;
            }
            return false;
        }
    }
}