如何使用Kivy在RecycleView中选择整行

from kivy.app import App
from kivy.uix.recycleview import RecycleView
from kivy.uix.recycleview.views import RecycleDataViewBehavior
from kivy.uix.label import Label
from kivy.uix.behaviors import FocusBehavior

class SelectableRecycleBoxLayout(FocusBehavior, RecycleDataViewBehavior, LayoutSelectionBehavior):
    pass

class SelectableLabel(RecycleDataViewBehavior, Label):
    index = None
    selected = BooleanProperty(False)
    selectable = BooleanProperty(True)

    def refresh_view_attrs(self, rv, index, data):
        self.index = index
        return super(SelectableLabel, self).refresh_view_attrs(rv, index, data)

    def on_touch_down(self, touch):
        if super(SelectableLabel, self).on_touch_down(touch):
            return True
        if self.collide_point(*touch.pos) and self.selectable:
            return self.parent.select_with_touch(self.index, touch)

class RVAdapter(RecycleViewAdapter):
    def __init__(self, **kwargs):
        super(RVAdapter, self).__init__(**kwargs)
        self.selected_index = None

    def refresh_view_attrs(self, rv, index, data):
        return super(RVAdapter, self).refresh_view_attrs(rv, index, data)

    def on_selection_change(self, *args):
        self.selected_index = args[1][0] if args[1] else None

class MyApp(App):
    def build(self):
        rv = RecycleView()
        rv.viewclass = 'SelectableLabel'
        rv.data = [{'text': str(x)} for x in range(100)]
        rv.layout_manager = SelectableRecycleBoxLayout()
        rv.adapter = RVAdapter()
        return rv

if __name__ == '__main__':
    MyApp().run()