How do I handle Sign In Exceptions? - firebase

Question

Hello I am new to flutter, I am making a social media app in which users are to signIn using email and password. I want to know how do I show users login errors such as Incorrect Password / Incorrect email etc. I am using firebase as back end database for application
I have successfully created both the login and registration parts of the application, but I am unable to show different errors. here is is my code someone please help me
Future LogIn(BuildContext context) async {
FirebaseUser user = (await _Auth.signInWithEmailAndPassword(
email: getEmail(), password: getPass()))
.user;
try {
if (user.isEmailVerified) {
Navigator.pushNamed(context, HomeScreen.id);
//Navigator.pushNamed(context, HomeScreen.id);
ClearAllInfo();
} else {
user.sendEmailVerification();
Alert("EMAIL NOT VERIFIED").show(); //email not verified alert
}
} catch (e) {}
}

Answer 1

The documentation for signInWithEmailAndPassword lists all possible errors:
ERROR_INVALID_EMAIL
ERROR_WRONG_PASSWORD
ERROR_USER_NOT_FOUND
ERROR_USER_DISABLED
ERROR_TOO_MANY_REQUESTS
ERROR_OPERATION_NOT_ALLOWED
Now, you can test for these in your try-catch:
try {
FirebaseAuth.instance.signInWithEmailAndPassword(...); // Your signin call.
} on PlatformException catch (e) {
switch (e.code) {
case 'ERROR_WRONG_PASSWORD':
// Handle wrong password.
break;
// Add other cases.
default:
break;
}
}
Note that the catch block I added only catches PlatformExceptions. If you expect to see other exceptions, you might want to add another general catch block or on specific exceptions.