module importing errors on android

[banguwangu]

Question

Why is flet built apk when compiled and installed on android is raising importing errors. when that same application built for android is working properly, even if the application archive have managed to include all the source code.

Code sample

import flet as ft, os, logging, sys
import subprocess
from config import base_dir


if getattr(sys, 'frozen', False):
    # Running as compiled/packaged app
    base_path = sys._MEIPASS
else:
    # Running in development
    base_path = os.path.dirname(os.path.abspath(__file__))

# Add both paths to ensure imports work
sys.path.insert(0, base_path)
sys.path.insert(0, os.path.join(base_path, "app_core"))
try:
    from app_core import Base, engine, MigrationManager
except ImportError as e:
    from app_core.db import Base, engine
    from migration_manager import MigrationManager

from models import *
from views import *

routes = {
    "/login": LoginView, 
    "/register": RegisterView,
    "/recovery":RecoveryView,
    "/dashboard": admin.DashboardView,
    "/users": admin.UsersView,
    "/products":admin.ProductsView,
    "/suppliers": admin.SupplierView,
    "/sales":admin.SaleView,
    "/inventory": admin.InventoryView,
    "/brands":admin.BrandsView,
    "/settings":admin.SettingsView,
    "/home": HomeView,
}
logger = logging.getLogger(__name__)


def getAppdata_dir():
    if hasattr(os, 'getenv'):
        app_dir = os.getenv("APP_DATA_DIR",".")
    else:
        app_dir = os.path.expanduser("~/.invento")
    os.makedirs(app_dir, exist_ok = True)
    return app_dir

def init_database_safe():
    """Initialize database in app-specific directory"""
    app_dir = getAppdata_dir()
    db_path = os.path.join(app_dir, "app.db")
    
    # Configure your database engine to use this path
    # This depends on your database configuration in core.py
    
    # Check if database already exists
    if not os.path.exists(db_path):
        logger.info("Creating new database...")          
        
        #Base.metadata.create_all(engine)

    else:
        logger.info("Using existing database")
    
    db_manager = MigrationManager(engine, Base)
    db_manager.init()
    
    


def main(page: ft.Page):
    page.title = " Invento System"
    page.full_screen = True
    
    page.vertical_alignment = ft.MainAxisAlignment.CENTER
    page.horizontal_alignment = ft.CrossAxisAlignment.CENTER

    

    def routeChange(e):
        page.views.clear()
        routeVar = page.route
        if routeVar in routes:
            page.views.append(
                routes.get(routeVar)(page)
            )
        page.update()
    
    def viewPop(e):
        page.views.pop()
        top_view = page.views[-1]
        page.route = top_view.route
        page.update()

    page.on_route_change = routeChange
    page.on_view_pop = viewPop
    page.go(list(routes.keys())[0])

    

if __name__ == "__main__":
    init_database_safe()
    ft.app(target = main)

Error message

Traceback (most recent call last):
  File "/data/user/0/__application_folder__/files/flet/app/main.py", line 17, in <module>
    from app_core import Base, engine, MigrationManager
ModuleNotFoundError: No module named 'app_core'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 95, in <module>
  File "<frozen runpy>", line 229, in run_module
  File "<frozen runpy>", line 88, in _run_code
  File "/data/user/0/_application_folder/files/flet/app/main.py", line 19, in <module>
    from app_core.db import Base, engine
ModuleNotFoundError: No module named 'app_core'

------------------------------------------------------

• I have searched for answers to my question both in the issues and in previous discussions.

[Luis-711]

Tengo exactamente el mismo problema. Hasta hace unos días todo compilaba bien pero ahora cada app que quiero compilar como APK me da ese error, incluso alguna muy simple de prueba. Probé en un entorno virtual con python 3.12 e igual falla. Apks que antes compilaban perfecto ya no lo hacen.

¿Alguien tiene el mismo problema?

[FeodorFitsner]

what version of Flet is that?

[Luis-711]

0.28.3
Hay otro usuario con el mismo problema en una discusión de 5 días atrás. Empezó hace unos días esta falla.
Gracias por responder y espero se pueda solucionar rápido!

EDIT: el apk solo se instala si dejamos todos los archivos sueltos dentro de src (lo cual es desprolijo e ineficiente).
Hasta hace unos días este errores de los imports desde carpetas no se manifestaba.

[MasterA5]

This also happens in the most recent beta version.

[FeodorFitsner]

Right now I'm working on a new version of Flet app and testing it on Android and all its modules can be imported without any problems. Can you guys do a simple, trivial, complete repro app in a public GitHub repository with a few modules that, once installed on Android, demonstrates the issue?