gistfile1.txt

<ThumbnailedListItem@SelectableView+BoxLayout>:
    index: root.index
    text: root.text if root.text else ''
    size_hint_y: root.size_hint_y
    height: root.height
    carry_selection_to_children: True
    Image
        source: "fruit_images/{0}.32.jpg".format(root.text) if root.text else ''
    ListItemButton:
        index: root.index
        text: root.text if root.text else ''
        on_release: self.parent.trigger_action(duration=0)

...

    ListView:
        id: fruits_list_view
        args_converter: app.list_item_args_converter
        selection_mode: 'single'
        allow_empty_selection: False
        size_hint: .2, 1.0
        item_view_cls: 'ThumbnailedListItem'
        Binding:
            source: app.current_fruits_controller
            prop: 'data'

...