public void bottomOne(View v) {
   if (mBottomSheetBehavior.getState() == BottomSheetBehavior.STATE_HIDDEN) {
     mBottomSheetBehavior.setState(BottomSheetBehavior.STATE_COLLAPSED);
   } else {
     mBottomSheetBehavior.setState(BottomSheetBehavior.STATE_HIDDEN);
   }
 }