首先，从自定义模型开始，确定您想要的东西，在这种情况下，我将简单地使用 uid

First, start with the custom model and decide what you would like to have, in this case I will simply have the uid

 class User {
      final String uid;

      User({ this.uid });
    }

AuthService

// Create user object based on FirebaseUser
  User _customModelForFirebaseUser(FirebaseUser user) {
    return user != null ? User(uid: user.uid) : null;
  }

  // auth changed user stream
  Stream<User> get user {
    return _auth.onAuthStateChanged
      .map(_customModelForFirebaseUser)
  }

我的应用

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return StreamProvider<User>.value(
      value: AuthService().user,
      child: MaterialApp(
        home: Wrapper(),
      ),
    );
  }
}

然后您可以从任何地方访问它，就像这样:

Then you can access it from anywhere, like so:

 @override
      Widget build(BuildContext context) {

        final user = Provider.of<User>(context);
}