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Showing posts from July, 2011

Android Fling Detection

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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