Kivy, python и android

__version__ = '0.1'
 
import os
 
from kivy.app import App
from kivy.lang import Builder
from kivy.properties import ObjectProperty, StringProperty
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.uix.boxlayout import BoxLayout
from kivy.network.urlrequest import UrlRequest
# from kivymd.button import
 
 
from libs.navigationdrawer import NavigationDrawer
from kivymd.theming import ThemeManager
from config import KV_DIR
 
 
class StartScreen(BoxLayout):
    pass
 
 
class AboutScreen(Screen):
    pass
 
 
class SettingsScreen(Screen):
    pass
 
 
class ProgramScreen(Screen):
    pass
 
 
class ScreenManagement(ScreenManager):
    def __init__(self, **kwargs):
        super(ScreenManagement, self).__init__(**kwargs)
        self.add_widget(ProgramScreen(name="program"))
        self.add_widget(SettingsScreen(name="settings"))
        self.add_widget(AboutScreen(name="about"))
 
 
class Navigator(NavigationDrawer):
    title = StringProperty('special application')
 
 
class NavigateApp(App):
    theme_cls = ThemeManager()
    nav_drawer = ObjectProperty()
    out_label = StringProperty()
    def build(self):
        self.load_all_kv_files(KV_DIR)
        main_widget = Builder.load_file(os.path.join(KV_DIR, "startscreen.kv"))
        self.nav_drawer = Navigator()
        return main_widget
 
    def load_all_kv_files(self, directory_kv_files):
        Builder.load_file(os.path.join(directory_kv_files, "startscreen.kv"))
        Builder.load_file(os.path.join(directory_kv_files, "navigationdrawer.kv"))
        Builder.load_file(os.path.join(directory_kv_files, "about.kv"))
        Builder.load_file(os.path.join(directory_kv_files, "program.kv"))
        Builder.load_file(os.path.join(directory_kv_files, "settings.kv"))
        Builder.load_file(os.path.join(directory_kv_files, "navigator_menu.kv"))
 
    def show_about(self, *args):
        self.root.ids.manager.current = "about"
        return True
 
    def show_settings(self, *args):
        self.root.ids.manager.current = "settings"
        return True
 
    def show_program(self, *args):
        self.root.ids.manager.current = "program"
        return True
 
    def press_button(self):
        pass
NavigateApp().run()

<SettingsScreen>:
    BoxLayout:
 
        background_color: app.theme_cls.primary_dark
        orientation: "vertical"
        Label:
            color: 0, 0, 0, 1
            text: "settings"
        Label:
            id: out_label
            color: 0, 0, 0, 1
            text: '123'
        Button:
            text: "Button_text"
            on_press: app.press_button()