KnowledgeHub
Questions
Tags
Users
Search
Alex Rivera
|
Logout
Edit Question
Title
Body
I am trying to detect a fling event on a simple Android application, but the first MotionEvent argument is always null. Why is the onFling method being called with a null argument? The Android documentation says that it gets called when a fling event occurs with the initial on down MotionEvent and the matching up MotionEvent. class MyGestureDetector extends SimpleOnGestureListener { @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { // e1 always == null, return early a null reference exception if (e1 == null) { return false; } if (e1.getY() - e2.getY() > 120) { handleFlingEvent(); return true; } return false; } } The main Activity has this onTouchEvent method: GestureDetector flingDetector = new GestureDetector(new MyGestureDetector()); @Override public boolean onTouchEvent(MotionEvent event) { if (flingDetector.onTouchEvent(event)) { return true; } return super.onTouchEvent(event); }
Tags (comma-separated)
Save Edits
Cancel