Help Flutter Help Firebase Login Auth facing error.

[J-Laxz]

hello po matagal tagal napo akong nag hahanap ng solution para sa error nato.

gusto ko lang po e handle and signin auth ko
kaso nag e-error sya kapag nag input ang user nang mali tapos crash agad.


this is my code for auth:

class Auth {
  final _auth = FirebaseAuth.instance;

  Future sigin(
      String signinEmail, String signinPassword, BuildContext context) async {
    try {
      await _auth.signInWithEmailAndPassword(
          email: signinEmail, password: signinPassword);

      if (!context.mounted) return;
      Navigator.push(
          context, MaterialPageRoute(builder: (context) => const HomePage()));
    } on FirebaseAuthException catch (e) {
      // Handle FirebaseAuthException
      String errorMessage;
      switch (e.code) {
        case 'invalid-email':
          errorMessage = 'Invalid Email';
          break;
        case 'user-disabled':
          errorMessage = 'User Disabled';
          break;
        case 'user-not-found':
          errorMessage = 'User Not Found';
          break;
        case 'wrong-password':
          errorMessage = 'Wrong Password';
          break;
        default:
          errorMessage = 'An error occurred during sign-in: ${e.code}';
      }
      showSnackbarMessage(context, errorMessage);
      print('Firebase Authentication Exception: ${e.code}/////////////');
    } catch (e) {
      // Handle other exceptions
      showSnackbarMessage(context, 'Unexpected error during sign-in: $e');
      print('Unexpected Exception: $e/////////////');
    }
  }
}

void showSnackbarMessage(BuildContext context, String message) {
  ScaffoldMessenger.of(context).showSnackBar(
    SnackBar(
      content: Text(message),
      backgroundColor: Colors.red,
      duration: const Duration(seconds: 3),
      behavior: SnackBarBehavior.floating,
      margin: const EdgeInsets.only(bottom: 600, right: 20, left: 20),
    ),
  );
}

Thank you po sa maka sagot.

 

[🤖]

Hello! I see that you are facing an issue with handling sign-in authentication errors in your Flutter app using Firebase. The code you shared looks mostly correct, but I can help you identify the potential reason for the crash after handling the authentication errors.

In your Auth class, the sigin method is responsible for signing in the user and handling authentication exceptions. The main issue that might be causing the crash is related to the usage of ScaffoldMessenger.of(context).showSnackBar method inside the showSnackbarMessage function.

When you call showSnackbarMessage to display the error message, make sure that the context you are passing is valid and still available. If the context is no longer valid or has been disposed of (e.g., due to the widget being removed from the widget tree), calling ScaffoldMessenger.of(context) can lead to a crash.

To address this issue, you can modify your code as follows:

1. Pass a GlobalKey<ScaffoldState> to your Auth class and use it to show the SnackBar.
2. Ensure that the context passed to showSnackbarMessage is always valid.

Here's an updated version of your code with the modifications:

class Auth {
  final _auth = FirebaseAuth.instance;

  Future sigin(
      String signinEmail, String signinPassword, GlobalKey<ScaffoldState> scaffoldKey) async {
    try {
      await _auth.signInWithEmailAndPassword(
          email: signinEmail, password: signinPassword);
      
      // Check if scaffoldKey is not null and the current state is mounted
      if (scaffoldKey != null && scaffoldKey.currentState != null && scaffoldKey.currentState.mounted) {
        scaffoldKey.currentState.showSnackBar(SnackBar(
          content: Text('Sign-in successful!'),
          backgroundColor: Colors.green,
          duration: const Duration(seconds: 3),
        ));
      }

      // Navigate to the home page
      // Navigator.push(
      //     context, MaterialPageRoute(builder: (context) => const HomePage()));
    } on FirebaseAuthException catch (e) {
      // Handle FirebaseAuthException
      String errorMessage;
      switch (e.code) {
        // Handle specific error cases
      }
      showSnackbarMessage(scaffoldKey, errorMessage);
      print('Firebase Authentication Exception: ${e.code}');
    } catch (e) {
      // Handle other exceptions
      showSnackbarMessage(scaffoldKey, 'Unexpected error during sign-in: $e');
      print('Unexpected Exception: $e');
    }
  }
}

void showSnackbarMessage(GlobalKey<ScaffoldState> scaffoldKey, String message) {
  scaffoldKey.currentState.showSnackBar(
    SnackBar(
      content: Text(message),
      backgroundColor: Colors.red,
      duration: const Duration(seconds: 3),
    ),
  );
}

In your widget where you are calling the sigin method, make sure to pass a valid GlobalKey<ScaffoldState> to the Auth class. This way, you can ensure that the SnackBar is displayed without causing any crashes due to invalid contexts.

I hope this helps you resolve the issue you are facing with handling authentication errors in your Flutter app. If you have any more questions or need further assistance, feel free to ask!