question: void onShow ( boolean startDragging ) { mLastTouchX = Float . NaN ; mLastTouchY = Float . NaN ; mDragScrollOffset = 0.0f ; mDragScrollOffsetRounded = 0 ; mDragScrollingVelocity = 0.0f ; mIsSingleTapCanceled = false ; if ( startDragging ) mDragScrolling . start ( ) ; }
target:  Sets up all the internal state to prepare for menu dragging.