UnHandled Exception : Unable to capture the error - flutter

Question

I am trying to use Firebase Auth with Flutter. Below is my code.
login_screen.dart
RaisedButton(
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(5)),
color: blackShadeColor,
child: Text("Login",
style: GoogleFonts.poppins(
textStyle: TextStyle(
color: Colors.white,
fontWeight: FontWeight.w500,
fontSize: 16))),
onPressed: () {
_loginScreenController
.login(
context: context,
email: _emailController.text,
password: _passwordController.text)
.catchError((error) {
print(error);
});
},
),
login_screen_controller.dart
class LoginScreenController {
/**
* Login Function
*/
Future<void> login({BuildContext context, String email, String password}) async {
FirebaseAuthService firebaseAuthService = FirebaseAuthService();
firebaseAuthService.signInWithEmail(email, password).then(((value){})).catchError((onError){
throw onError;
});
}
}
firebase_auth_service.dart
import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
class FirebaseAuthService with ChangeNotifier {
//Sign in with username and password
Future<void> signInWithEmail(String email, String password) async {
FirebaseAuth auth = FirebaseAuth.instance;
try {
UserCredential userCredential = await auth.signInWithEmailAndPassword(
email: email, password: password);
User user = userCredential.user;
if (user != null) {
print("Sign in success: " + user.email);
} else {
print("sign in failed");
throw Exception(
"Sign in Failed. Please check your email and password again");
}
} catch (e) {
print(e.toString());
throw (e);
} finally {
//notifyListeners();
}
}
}
If there is an error, like wrong password, wrong email or something, the firebase throws an error. The issue is my attempts to catch that error is not working as expected. Instead I end up with Unhandled exception. This is the error I get.
I/flutter (18418): [firebase_auth/invalid-email] The email address is badly formatted.
E/flutter (18418): [ERROR:flutter/lib/ui/ui_dart_state.cc(177)] Unhandled Exception: [firebase_auth/invalid-email] The email address is badly formatted.
[38;5;248mE/flutter (18418): #0 FirebaseAuthService.signInWithEmail[39;49m
package:wnenterprises/services/firebase_auth_service.dart
E/flutter (18418): <asynchronous suspension>
[38;5;248mE/flutter (18418): #1 LoginScreenController.login[39;49m
package:wnenterprises/controllers/login_screen_controller.dart
[38;5;248mE/flutter (18418): #2 _LoadingScreenState.build.<anonymous closure>[39;49m
package:wnenterprises/screens/login_screen.dart
[38;5;244mE/flutter (18418): #3 _InkResponseState._handleTap[39;49m
package:flutter/…/material/ink_well.dart
[38;5;244mE/flutter (18418): #4 _InkResponseState.build.<anonymous closure>[39;49m
package:flutter/…/material/ink_well.dart
[38;5;244mE/flutter (18418): #5 GestureRecognizer.invokeCallback[39;49m
package:flutter/…/gestures/recognizer.dart
[38;5;244mE/flutter (18418): #6 TapGestureRecognizer.handleTapUp[39;49m
package:flutter/…/gestures/tap.dart
[38;5;244mE/flutter (18418): #7 BaseTapGestureRecognizer._checkUp[39;49m
package:flutter/…/gestures/tap.dart
[38;5;244mE/flutter (18418): #8 BaseTapGestureRecognizer.acceptGesture[39;49m
package:flutter/…/gestures/tap.dart
[38;5;244mE/flutter (18418): #9 GestureArenaManager.sweep[39;49m
package:flutter/…/gestures/arena.dart
[38;5;244mE/flutter (18418): #10 GestureBinding.handleEvent[39;49m
package:flutter/…/gestures/binding.dart
[38;5;244mE/flutter (18418): #11 GestureBinding.dispatchEvent[39;49m
package:flutter/…/gestures/binding.dart
[38;5;244mE/flutter (18418): #12 RendererBinding.dispatchEvent[39;49m
package:flutter/…/rendering/binding.dart
[38;5;244mE/flutter (18418): #13 GestureBinding._handlePointerEvent[39;49m
package:flutter/…/gestures/binding.dart
[38;5;244mE/flutter (18418): #14 GestureBinding._flushPointerEventQueue[39;49m
package:flutter/…/gestures/binding.dart
[38;5;244mE/flutter (18418): #15 GestureBinding._handlePointerDataPacket[39;49m
package:flutter/…/gestures/binding.dart
[38;5;244mE/flutter (18418): #16 _rootRunUnary (dart:async/zone.dart:1206:13)[39;49m
[38;5;244mE/flutter (18418): #17 _CustomZone.runUnary (dart:async/zone.dart:1100:19)[39;49m
[38;5;244mE/flutter (18418): #18 _CustomZone.runUnaryGuarded (dart:async/zone.dart:1005:7)[39;49m
[38;5;244mE/flutter (18418): #19 _invoke1 (dart:ui/hooks.dart:265:10)[39;49m
[38;5;244mE/flutter (18418): #20 _dispatchPointerDataPacket (dart:ui/hooks.dart:174:5)[39;49m
E/flutter (18418):
What is really happening here?

Answer 1

Instead of async await, you can try the regular .then() method and use the catch error function. :
auth.signInWithEmailAndPassword(email: email, password: password).then((val){print(val);}).catchError((e){print("Exception: " + e.toString())});