main.py

from kivy.app import App
from kivy.core.window import Window
from kivy.uix.screenmanager import ScreenManager
from kivy.utils import platform

from android_permissions import AndroidPermissions

from applayout.homescreen0  import HomeScreen0
from applayout.photoscreen1 import PhotoScreen1
from applayout.photoscreen2 import PhotoScreen2
from applayout.screenshot3 import ScreenShot3
from applayout.videoscreen4 import VideoScreen4
from applayout.videoscreen5 import VideoScreen5

from camera4kivy import CameraProviderInfo

if platform == 'android':
    from jnius import autoclass
    from android.runnable import run_on_ui_thread
    from android import mActivity
    View = autoclass('android.view.View')

    @run_on_ui_thread
    def hide_landscape_status_bar(instance, width, height):
        # width,height gives false layout events, on pinch/spread 
        # so use Window.width and Window.height
        if Window.width > Window.height: 
            # Hide status bar
            option = View.SYSTEM_UI_FLAG_FULLSCREEN
        else:
            # Show status bar 
            option = View.SYSTEM_UI_FLAG_VISIBLE
        mActivity.getWindow().getDecorView().setSystemUiVisibility(option)
elif platform != 'ios':
    # Dispose of that nasty red dot, required for gestures4kivy.
    from kivy.config import Config 
    Config.set('input', 'mouse', 'mouse, disable_multitouch')

class MyApp(App):
    
    def build(self):
        self.enable_swipe = False
        self.sm = ScreenManager()
        self.screens = [HomeScreen0(name='0'),
                        PhotoScreen1(name='1'),
                        PhotoScreen2(name='2'),
                        ScreenShot3(name='3'),
                        VideoScreen4(name='4')]
        if CameraProviderInfo().get_name() in ['picamera2','opencv']:
            self.screens.append(VideoScreen5(name='5'))
        for s in self.screens:
            self.sm.add_widget(s)
        if platform == 'android':
            Window.bind(on_resize=hide_landscape_status_bar)
        return self.sm

    def on_start(self):
        self.dont_gc = AndroidPermissions(self.start_app)

    def start_app(self):
        self.dont_gc = None
        self.enable_swipe = True

    def swipe_screen(self, right):
        if self.enable_swipe:
            i = int(self.sm.current)
            if right:
                self.sm.transition.direction = 'right'
                self.sm.current = str((i-1) % len(self.screens))
            else:
                self.sm.transition.direction = 'left'
                self.sm.current = str((i+1) % len(self.screens))
                    

MyApp().run()