Flutter - programmatically close application when init failed

Question

My app performs some checks inside main() function, before runApp( MyApp()); , most important is load app configuration from Firebase. If failed, there's no any way to run not configured app. So I want to show message box saying "app configuration load failed", then after user press OK, exit app.

What is preferred way to exit app in that case? I need it working on iOS and Android.

Answer 1

If you need UI, I would suggest still calling runApp but on a different widget:

if(success){
    runApp(MyApp());
} else {
   runApp(ErrorApp());
}

For closing a flutter app programmatically, the best way is using SystemNavigator.pop() but if that didn't work, you can try exit(0) .