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I have Firebase a sign in for my app. I want to report exceptions to the user so he can correctly login. It is email and password sign in signInWithEmailAndPassword(_email, _password). Testing I can create two exceptions which are self explanatory

1/ Error: PlatformException(exception, There is no user record corresponding to this identifier. The user may have been deleted., null)

2/ Error: PlatformException(exception, The password is invalid or the user does not have a password., null)

I'm using a try catch block to catch the error. Here is my code:

void validateAndSubmit() async 
 FocusScope.of(context).requestFocus(new FocusNode());
 if (validateAndSave()) 
 try 
 var auth = AuthProvider.of(context).auth;
 FirebaseUser user =
 await auth.signInWithEmailAndPassword(_email, _password);
 print('Signed in: $user.uid');
 Navigator.pop(context);
 widget.loginCallback(user);

 catch (e) 
 print('Error: $e');
 setState(() 
 _showMessage=true;

 );
 
 
 

I want to give a different message depending on the exception. But there doesn't seem to be any code associated with the exception.

You can catch different kind of exceptions, for each exceptions, you can check the code

 void validateAndSubmit() async 
 FocusScope.of(context).requestFocus(new FocusNode());
 if (validateAndSave()) 
 try 
 var auth = AuthProvider.of(context).auth;
 FirebaseUser user =
 await auth.signInWithEmailAndPassword(_email, _password);
 print('Signed in: $user.uid');
 Navigator.pop(context);
 widget.loginCallback(user);

 on FirebaseAuthInvalidUserException catch (e) 
 print('FirebaseAuthInvalidUserException: $e');
 if (e.code === 'ERROR_USER_NOT_FOUND') 
 setState(() 
 _showMessage=true;

 );
 else 
 // do something
 
 
 on FirebaseAuthInvalidCredentialsException catch (e) 
 // do something InvalidCredentials 
 catch (e) 
 // do something else
 
 

You can check e.code.
Check out native firebase documentation. It has values like 'ERROR_USER_NOT_FOUND'