如何检查用户是否已使用 Google Sign in 和 Firebase Auth 登录以检索他们的数据？

Question

我有一个用 Flutter 制作的简单游戏，我可以登录用户，但我不知道如何检查用户是否已登录以及如何获取用户的数据。

对于登录，我使用这种方法，登录用户后，我可以获取他的数据：

Future<String> signInWithGoogle() async{

    print("INICIALIZANDO LOGIN COM GOOGLE...");

    googleSignInAccount = await googleSignIn.signIn();
    googleSignInAuthentication = await googleSignInAccount.authentication;

    final AuthCredential credential = GoogleAuthProvider.getCredential(
        accessToken: googleSignInAuthentication.accessToken,
        idToken: googleSignInAuthentication.idToken,

    );

    AuthResult authResult = await _auth.signInWithCredential(credential);

    user = authResult.user;

    assert(!user.isAnonymous);
    assert(await user.getIdToken() != null);

    currentUser = await _auth.currentUser();
    assert(user.uid == currentUser.uid);

    uid = user.uid;
    name = user.displayName;
    email = user.email;
    imageUrl = user.photoUrl;

    print(uid);
    print(email);
    print(name);
    print(imageUrl);

    return 'signInWithGoogle succeded: $user';

  }

对于 signOut 这个：

  void signOutGoogle() async{

    print("DESLOGOU!");
  await googleSignIn.signOut();

  }

Answer 1

MyAppClient.dart

Future getCurrentUser() async {
FirebaseUser _user = await FirebaseAuth.instance.currentUser();
print("User: ${_user.displayName ?? "None"}");
return _user;}

Main.dart

return MaterialApp(
  title: 'Flutter Demo',
  theme: ThemeData(
    primarySwatch: GSTheme.backgroundColor,
  ),
  debugShowCheckedModeBanner: false,
  home: MyAppClient().getCurrentUser() != null
      ? HomeViewController()
      : LoginViewController(),
);