如何使用flutter中的提供程序初始化数据

dependencies:
  flutter:
    sdk: flutter
  provider: ^5.0.0

import 'package:provider/provider.dart';

class UserData {
  String name;
  int age;

  UserData({required this.name, required this.age});
}

import 'package:flutter/foundation.dart';

class UserProvider extends ChangeNotifier {
  UserData _userData;

  UserProvider() {
    _userData = UserData(name: 'John Doe', age: 25);
  }

  UserData get userData => _userData;

  void updateUserData(UserData newData) {
    _userData = newData;
    notifyListeners();
  }
}

void main() {
  runApp(
    MultiProvider(
      providers: [
        ChangeNotifierProvider(create: (_) => UserProvider()),
      ],
      child: MyApp(),
    ),
  );
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'My App',
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final userProvider = Provider.of<UserProvider>(context);
    final userData = userProvider.userData;

    return Scaffold(
      appBar: AppBar(
        title: Text('Home'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text('Name: ${userData.name}'),
            Text('Age: ${userData.age}'),
          ],
        ),
      ),
    );
  }
}