在Firebase Flutter中，如何使用自定义类访问登录用户的详细信息

class User {
  String uid;
  String name;
  String email;
  String avatarUrl;

  User({this.uid, this.name, this.email, this.avatarUrl});
}

import 'package:firebase_auth/firebase_auth.dart';

User getCurrentUser() {
  User currentUser;
  FirebaseAuth.instance.authStateChanges().listen((User user) {
    if (user != null) {
      currentUser = User(
        uid: user.uid,
        name: user.displayName,
        email: user.email,
        avatarUrl: user.photoURL,
      );
    }
  });
  return currentUser;
}