Show alert dialog on app main screen load automatically in flutter

Question

I want to show alert dialog based on a condition. Not based on user interaction such as button press event.

If a flag is set in app state data alert dialog is shown

Answer 1

This is how I achieved this in a simple way:

1. Add https://pub.dev/packages/shared_preferences

2. Above the build method of your main screen (or any desired widget):

   Future checkFirstRun(BuildContext context) async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    bool isFirstRun = prefs.getBool('isFirstRun') ?? true;
   
    if (isFirstRun) {
      // Whatever you want to do, E.g. Navigator.push()
      prefs.setBool('isFirstRun', false);
    } else {
      return null;
    }
   }
   

3. Then on your widget's initState:

   @override
   void initState() {
     super.initState();
     WidgetsBinding.instance.addPostFrameCallback((_) => checkFirstRun(context));
   }
   

This ensures the function is run after the widget is built.