question: private boolean checkIfScrolling ( float [ ] lastPoints , MotionEvent ev ) { float [ ] point = new float [ 2 ] ; point [ 0 ] = ev . getRawX ( ) ; point [ 1 ] = ev . getRawY ( ) ; float delta = getDistance ( lastPoints , point ) ; return Math . abs ( delta ) > mSlop ; }
target:  Checks to see if the user is currently scrolling the menu.