How to work with Swipe Gestures in Android

Gesture?
Gestures in android is defined as the movements of your fingers on android device screen and respond accordingly if there is any listener is implemented for gesture detection.

In this article we can see how to do action by SwipeTop, SwipeBottom, SwipeRight, SwipeLeft.

Let's Start

Create a class OnSwipeTouchListener

public class OnSwipeTouchListener implements View.OnTouchListener {

    private final GestureDetector gestureDetector = new GestureDetector(new GestureListener());

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

    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 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) {
                            result = onSwipeRight();
                        } else {
                            result = onSwipeLeft();
                        }
                    }
                } else {
                    if (Math.abs(diffY) > SWIPE_THRESHOLD && Math.abs(velocityY) > SWIPE_VELOCITY_THRESHOLD) {
                        if (diffY > 0) {
                            result = onSwipeBottom();
                        } else {
                            result = onSwipeTop();
                        }
                    }
                }
            } catch (Exception exception) {
                exception.printStackTrace();
            }
            return result;
        }
    }

    public boolean onSwipeRight() {
        return false;
    }

    public boolean onSwipeLeft() {
        return false;
    }

    public boolean onSwipeTop() {
        return false;
    }

    public boolean onSwipeBottom() {
        return false;
    }
}

Now open the Activity where you want a swipe gesture

If you need a swiping action anywhere in an Activity then select the Parent Layout as a view to apply gesture

yourView.setOnTouchListener(new OnSwipeTouchListener() {
    public boolean onSwipeTop() {
        //do your action
        return true;
    }
    public boolean onSwipeRight() {

         //do your action

        return true;
    }
    public boolean onSwipeLeft() {

         //do your action
        return true;
    }
    public boolean onSwipeBottom() {

         //do your action
        return true;
    }
});

That's it
________________________________________________________________

Happy Coding...