@Override public void onViewPositionChanged(View changedView,int left,int top,int dx,int dy){
  super.onViewPositionChanged(changedView,left,top,dx,dy);
  mDragOffset=Math.abs(top);
  float fractionScreen=(float)mDragOffset / mConfigView.getVerticalDragRange();
  mConfigView.onViewPositionChanged(fractionScreen >= 1 ? 1 : fractionScreen);
}

@ Override public void onViewPositionChanged ( View changedView , int left , int top , int dx , int dy ) { super . onViewPositionChanged ( changedView , left , top , dx , dy ) ; mDragOffset = Math . abs ( top ) ; float fractionScreen = ( float ) mDragOffset / mConfigView . getVerticalDragRange ( ) ; mConfigView . onViewPositionChanged ( fractionScreen >= 1 ? 1 : fractionScreen ) ; }
override method used notify the drag value based on position and dragrange
