The selection event of the listView, returns a key of the clicked event.
            You can retrieve the item rapidly

def list_view_on_selected(self, widget, selected_item_key):
        """ The selection event of the listView, returns a key of the clicked event.
            You can retrieve the item rapidly
        """
        self.lbl.set_text('List selection: ' + self.listView.children[selected_item_key].get_text())