here is my code, what i want to achieve is to show a snackbar to a user with the error which works fine but then the error is not caught and the app gets hanged ...

void signUp(String email, String password) async {
if (_formKey.currentState!.validate()) {
  try {
    await _auth
        .createUserWithEmailAndPassword(email: email, password: password)
        .then((value) => {postDetailsToFirestore()})
        .catchError((e) {
        Fluttertoast.showToast(msg: e!.message);

    });
  } on FirebaseAuthException catch (error) {
    switch (error.code) {
      case "invalid-email":
        errorMessage = "Your email address appears to be malformed.";
        break;
      case "wrong-password":
        errorMessage = "Your password is wrong.";
        break;
      case "user-not-found":
        errorMessage = "User with this email doesn't exist.";
        break;
      case "user-disabled":
        errorMessage = "User with this email has been disabled.";
        break;
      case "too-many-requests":
        errorMessage = "Too many requests";
        break;
      case "operation-not-allowed":
        errorMessage = "Signing in with Email and Password is not enabled.";
        break;
      default:
        errorMessage = "An undefined Error happened.";
    }
    
    // default snackbar
    Fluttertoast.showToast(msg: errorMessage!);
    print(error.code);
    // custom snackbar
    ScaffoldMessenger.of(context)
    ..hideCurrentSnackBar()
    ..showSnackBar(getSnack( errorMessage!, ContentType.failure, 'Failed !'));
    
    }
  }
}

now the problem is that it works fine when a new user creates an account but this error don't get caught when the user registers with the same email twice ... tried a lot of things like returning future and formatting and on error instead of catch error but i'm stuck on it for hours ...

CodePudding user response：

The case that you need to check is email-already-in-use and it should catch it when registering for a user using createUserWithEmailAndPassword method. You can check for other error codes in the documentation.

Also, if you're using async/await in your code, it's unnecessary to use then().catchError() in this case. You are fine just doing

try {
    await _auth.createUserWithEmailAndPassword(email: email, password: password);
    postDetailsToFirestore();
} on FirebaseAuthException catch (error) {
  // handle error
}