question: private boolean showHeaderOf ( int position , @ NonNull T item , boolean init ) { IHeader header = getHeaderOf ( item ) ; if ( header == null || getPendingRemovedItem ( item ) != null ) return false ; if ( header . isHidden ( ) ) { if ( DEBUG ) Log . v ( TAG , "Showing header at position " + position + " header=" + header ) ; header . setHidden ( false ) ; if ( init ) { if ( position < mItems . size ( ) ) { mItems . add ( position , ( T ) header ) ; } else { mItems . add ( ( T ) header ) ; } return true ; } else { return addItem ( position , ( T ) header ) ; } } return false ; }
target:  Internal method to show/add a header in the internal list.