gistfile1.txt

from kivy.app import App
from kivy.lang import Builder
from kivy.factory import Factory
from kivy import properties

load_dialog = """\
<LoadDialog>:
    chooser: filechooser
    BoxLayout:
        size: root.size
        pos: root.pos
        orientation: "vertical"

        FileChooserListView:
            id: filechooser
"""

view = Builder.load_string(load_dialog)

class LoadDialog(Factory.BoxLayout):
    chooser = properties.ObjectProperty()
    def __init__(self, *args, **kwargs):
        self.chooser.path = '/usr/bin/'
        super(LoadDialog, self).__init__(*args, **kwargs)

class Foo(App):
    def build(self):
        return LoadDialog()

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