question: public Builder addMenuItem ( @ NonNull String label , @ NonNull PendingIntent pendingIntent ) { if ( mMenuItems == null ) mMenuItems = new ArrayList < > ( ) ; Bundle bundle = new Bundle ( ) ; bundle . putString ( KEY_MENU_ITEM_TITLE , label ) ; bundle . putParcelable ( KEY_PENDING_INTENT , pendingIntent ) ; mMenuItems . add ( bundle ) ; return this ; }
target:  Adds a menu item.