Question

我在适用于Android的Flutter应用程序中使用Firebase电话身份验证。登录系统正常运行。但是，每次我打开该应用程序时，它都会返回空用户。因此，每次打开应用程序时我都必须登录。我不知道这是错误还是错误，但是我会在这里与大家共享代码。

PhoneAuth代码：

enum PhoneAuthStatus {
  SignedIn,
  CodeSent,
  HasError,
  SignedOut,
}


class PhoneAuth with ChangeNotifier {
  String verificationId;
  final FirebaseAuth phoneAuth = FirebaseAuth.instance;
  PhoneAuthStatus phoneAuthStatus = PhoneAuthStatus.SignedOut;

  PhoneAuth.initialize() {
    init();
  }

  Future<void> init() async {
    currentUser = await phoneAuth.currentUser();
    if (currentUser == null) {
      phoneAuthStatus = PhoneAuthStatus.SignedOut;
      notifyListeners();
    } else {
      phoneAuthStatus = PhoneAuthStatus.SignedIn;
    }
  }

  PhoneAuthStatus get status => phoneAuthStatus;
  FirebaseUser get user => currentUser;

  Future<void> verifyPhoneNumber(String phNum) async {
    phoneAuth.verifyPhoneNumber(
        phoneNumber: phNum,
        timeout: Duration(seconds: 90),
        verificationCompleted: (AuthCredential phoneAuthCredential) async {
          AuthResult authResult;
          try {
            authResult =
                await phoneAuth.signInWithCredential(phoneAuthCredential);
          } catch (error) {
            phoneAuthStatus = PhoneAuthStatus.HasError;
            notifyListeners();
            return;
          }
          currentUser = authResult.user;
          uid = currentUser.uid;
          phoneAuthStatus = PhoneAuthStatus.SignedIn;
          notifyListeners();
        },
        verificationFailed: (AuthException authException) {
          print(authException.message);
          phoneAuthStatus = (PhoneAuthStatus.HasError);
          notifyListeners();
        },
        codeSent: (String vId, [int forceResendingToken]) async {
          phoneAuthStatus = (PhoneAuthStatus.CodeSent);
          notifyListeners();
          verificationId = vId;
        },
        codeAutoRetrievalTimeout: (String vId) {
          verificationId = vId;
        });
    return;
  }

  Future<void> signInWithPhoneNumber(String code) async {
    final AuthCredential credential = PhoneAuthProvider.getCredential(
      verificationId: verificationId,
      smsCode: code.toString(),
    );
    AuthResult authResult;
    try {
      authResult = await phoneAuth.signInWithCredential(credential);
    } catch (error) {
      phoneAuthStatus = (PhoneAuthStatus.HasError);
      notifyListeners();
      return;
    }
    currentUser = authResult.user;
    phoneAuthStatus = (PhoneAuthStatus.SignedIn);
    notifyListeners();
    return;
  }

  Future<void> signOut() async {
    phoneAuth.signOut();
    phoneAuthStatus = (PhoneAuthStatus.SignedOut);
    notifyListeners();
  }
}

main.dart代码：

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MultiProvider(
      providers: [
        ChangeNotifierProvider.value(value: PhoneAuth.initialize()),
      ],
      child: MaterialApp(
        title: app_name,
        // routes: Routes.routes,
        debugShowCheckedModeBanner: false,
        theme: ThemeData(
            primarySwatch: Colors.blue,
        )
        home: Container(
          child: LocationError(currentWidget: HomePage()),
        ),
      ),
    );
  }
}

init（）函数应返回PhoneAuthStatus.SignedIn。但是，由于currentUser为null，它返回PhoneAuthStatus.SignedOut。请帮助我，告诉我我做错了什么。谢谢。

扑打医生：

Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, 1.20.0, on Microsoft Windows [Version 10.0.18363.959], locale en-US)
 
[!] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
    X Android license status unknown.
      Try re-installing or updating your Android SDK Manager.
      See https://developer.android.com/studio/#downloads or visit https://flutter.dev/docs/get-started/install/windows#android-setup for detailed instructions.
[√] Android Studio (version 4.0)
[√] VS Code (version 1.47.3)
[!] Connected device
    ! No devices available

! Doctor found issues in 2 categories.

Answer 1

您是否检查过将notifyListeners()放在if块之外？

     currentUser = await phoneAuth.currentUser();
    if (currentUser == null) {
      phoneAuthStatus = PhoneAuthStatus.SignedOut;
     
    } else {
      phoneAuthStatus = PhoneAuthStatus.SignedIn;
    }
 notifyListeners();

另一个猜测是，您正在init（）方法内调用一个future方法。也许这就是为什么您总是将身份验证状态作为signOut的原因。

“ init 方法在设计上是同步的。您可以在覆盖的build方法中返回FutureBuilder小部件，而不是在 init 方法中创建FutureBuilder小部件。可以在这里免费查看FutureBuilder小部件的文档，以获取有关其工作方式的示例。”

因此，我认为最好使用将来的构建器来验证用户的存在。

Flutter Firebase身份验证用户在设备上不持久

1 个答案: