import 'package:flutter/material.dart'; import 'package:shared_preferences/shared_preferences.dart'; import 'package:loc_chain_app/widgets/navbar.dart'; import 'dart:math'; void main() async { final prefs = await SharedPreferences.getInstance(); final id = prefs.getString('id') ?? '0'; if (id == '0') { prefs.setString('id', Random().nextInt(10000).toString()); } runApp(App()); } class App extends StatelessWidget { // This widget is the root of your application. @override Widget build(BuildContext context) { return MaterialApp( title: 'Flutter Demo', theme: ThemeData( primarySwatch: Colors.lightBlue, ), home: NavBarWidget(), ); } }