Android: How to handle right to left swipe gestures

OnSwipeTouchListener.java:

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;public class OnSwipeTouchListener implements OnTouchListener {    private final GestureDetector gestureDetector;    public OnSwipeTouchListener (Context ctx){        gestureDetector = new GestureDetector(ctx, new GestureListener());    }    @Override    public boolean onTouch(View v, MotionEvent event) {        return gestureDetector.onTouchEvent(event);    }    private final class GestureListener extends 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;        }    }    public void onSwipeRight() {    }    public void onSwipeLeft() {    }    public void onSwipeTop() {    }    public void onSwipeBottom() {    }}

Usage:

imageView.setOnTouchListener(new OnSwipeTouchListener(MyActivity.this) {    public void onSwipeTop() {        Toast.makeText(MyActivity.this, "top", Toast.LENGTH_SHORT).show();    }    public void onSwipeRight() {        Toast.makeText(MyActivity.this, "right", Toast.LENGTH_SHORT).show();    }    public void onSwipeLeft() {        Toast.makeText(MyActivity.this, "left", Toast.LENGTH_SHORT).show();    }    public void onSwipeBottom() {        Toast.makeText(MyActivity.this, "bottom", Toast.LENGTH_SHORT).show();    }});

This code detects left and right swipes, avoids deprecated API calls, and has other miscellaneous improvements over earlier answers.

/** * Detects left and right swipes across a view. */public class OnSwipeTouchListener implements OnTouchListener {    private final GestureDetector gestureDetector;    public OnSwipeTouchListener(Context context) {        gestureDetector = new GestureDetector(context, new GestureListener());    }    public void onSwipeLeft() {    }    public void onSwipeRight() {    }    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 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;        }    }}

Use it like this:

view.setOnTouchListener(new OnSwipeTouchListener(context) {    @Override    public void onSwipeLeft() {        // Whatever    }});

If you also need to process click events here some modifications:

public class OnSwipeTouchListener implements 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 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;    }}

And sample usage:

    background.setOnClickListener(new View.OnClickListener() {        @Override        public void onClick(View arg0) {            toggleSomething();        }    });    background.setOnTouchListener(new OnSwipeTouchListener() {        public boolean onSwipeTop() {            Toast.makeText(MainActivity.this, "top", Toast.LENGTH_SHORT).show();            return true;        }        public boolean onSwipeRight() {            Toast.makeText(MainActivity.this, "right", Toast.LENGTH_SHORT).show();            return true;        }        public boolean onSwipeLeft() {            Toast.makeText(MainActivity.this, "left", Toast.LENGTH_SHORT).show();            return true;        }        public boolean onSwipeBottom() {            Toast.makeText(MainActivity.this, "bottom", Toast.LENGTH_SHORT).show();            return true;        }    });