如何在Kivy中使用fileChooser选择多个文件？

from kivy.app import App
from kivy.uix.button import Button
from kivy.uix.filechooser import FileChooserListView
from kivy.uix.boxlayout import BoxLayout

class FileChooserApp(App):
    def build(self):
        layout = BoxLayout(orientation='vertical')
        file_chooser = FileChooserListView()
        layout.add_widget(file_chooser)
        button = Button(text='选择文件', size_hint=(1, 0.1))
        button.bind(on_release=lambda x: self.select_files(file_chooser.path, file_chooser.selection))
        layout.add_widget(button)
        return layout

    def select_files(self, path, filenames):
        for filename in filenames:
            print("选择的文件：", filename)

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