I found existing tutorials on how to do this to be a bit complicated. Here's how to do simple fling detection in four directions:public interface FlingListener {
void onTopToBottom();
void onBottomToTop();
void onLeftToRight();
void onRightToLeft();
}
public class FlingDetector {
static final int SWIPE_MIN_DISTANCE = 120;
static final int SWIPE_MAX_OFF_PATH = 250;
static final int SWIPE_THRESHOLD_VELOCITY = 200;
private final GestureDetector gestureDetector;
public FlingDetector(final FlingListener listener) {
gestureDetector = new GestureDetector(new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2,
float velocityX, float velocityY) {
if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH) {
if (Math.abs(e1.getX() - e2.getX()) > SWIPE_MAX_OFF_PATH
|| Math.abs(velocityY) < SWIPE_THRESHOLD_VELOCITY) {
return false;
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