1. Interactive Graphics in Android
CS7030: Mobile App Development

2. OnTouchEvent Event Description MotionEvent.ACTION_DOWN
New touch started
MotionEvent.ACTION_MOVE
Finger is moving
MotionEvent.ACTION_UP
Finger went up
MotionEvent.ACTION_CANCEL
Current event has been canceled, something else took control of the touch event
MotionEvent.ACTION_POINTER_DOWN
Pointer down (multi-touch)
MotionEvent.ACTION_POINTER_UP
Pointer up (multi-touch)
CS7030: Mobile App Development

3. GestureDetector
Recognize user actions that represent a series of MotiveEvent, such as flings, double-taps, long presses and scrolls.
GestureDetector.SimpleOnGestureListener is an adapter class that implements all the methods of GestureDetector.OnGestureListener and GestureDetector.OnDoubleTapListener interfaces.
CS7030: Mobile App Development

4. SimpleOnGestureListener methods
onDoubleTap(MotionEvent e)
Notified when a double-tap occurs.
onDown(MotionEvent e)
Notified when a tap occurs with the down MotionEvent that triggered it.
onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)
Notified of a fling event when it occurs with the initial on down MotionEvent and the matching up MotionEvent.
onLongPress(MotionEvent e)
Notified when a long press occurs with the initial on down MotionEvent that trigged it.
onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY)
Notified when a scroll occurs with the initial on down MotionEvent and the current move MotionEvent.
CS7030: Mobile App Development