OnSwipeTouchListener.java

package com.cobocn.hdms.app.ui.widget;

/**
 * Created by benny on 14-9-19.
 */

import android.content.Context;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;

public abstract class OnSwipeTouchListener implements View.OnTouchListener
{
    private final GestureDetector gestureDetector;

    public OnSwipeTouchListener(Context ctx)
    {
        gestureDetector = new GestureDetector(ctx, new GestureListener());
    }

    abstract void onSwipeRight();

    abstract void onSwipeLeft();

    abstract void onSwipeTop();

    abstract void onSwipeBottom();

    private final class GestureListener extends GestureDetector.SimpleOnGestureListener
    {

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

        @Override
        public boolean onDown(MotionEvent e)
        {
            return true;
        }

        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)
        {
            boolean result = false;
            try
            {
                float diffY = e2.getY() - e1.getY();
                float diffX = e2.getX() - e1.getX();
                if (Math.abs(diffX) > Math.abs(diffY))
                {
                    if (Math.abs(diffX) > SWIPE_THRESHOLD && Math.abs(velocityX) > SWIPE_VELOCITY_THRESHOLD)
                    {
                        if (diffX > 0)
                        {
                            onSwipeRight();
                        }
                        else
                        {
                            onSwipeLeft();
                        }
                    }
                    result = true;
                }
                else if (Math.abs(diffY) > SWIPE_THRESHOLD && Math.abs(velocityY) > SWIPE_VELOCITY_THRESHOLD)
                {
                    if (diffY > 0)
                    {
                        onSwipeBottom();
                    }
                    else
                    {
                        onSwipeTop();
                    }
                }
                result = true;
            }
            catch (Exception exception)
            {
                exception.printStackTrace();
            }
            return result;
        }
    }
}