Flutter Firebase Auth / Google_sign_in fail to login with statuscode=CANCELED

Question

This is my pubspec.yaml. I'm using Flutter:

dependencies:
flutter:
    sdk: flutter

cupertino_icons: ^0.1.2
shared_preferences: ^0.4.2
json_serializable: ^1.2.1
camera: ^0.2.3
path_provider: ^0.4.1
simple_permissions: ^0.1.6
share: ^0.5.3
#Google Sign_In
firebase_auth: ^0.5.20
google_sign_in: ^3.0.5

I cannot authenticate with the Google Sign In method. The window shows up normally and after my app throws a error:

PlatformException(sign_in_failed, Status{statusCode=CANCELED, resolution=null}, null)

Haven't found any solutions online, can someone help me out?

The following is my _signIn() method

Future<FirebaseUser> _signIn() async {

GoogleSignInAccount googleSignInAccount = await googleSignIn.signIn();
GoogleSignInAuthentication gSA = await googleSignInAccount.authentication;

FirebaseUser user = await auth.signInWithGoogle(
    idToken: gSA.idToken, accessToken: gSA.accessToken);

print("User Name : ${user.displayName}");
return user;
}

My code crashes after I call GoogleSignInAccount googleSignInAccount = await googleSignIn.signIn(); so my guess was, that my setup was wrong.

This is how I call the _signIn()

MaterialButton(
        child: Text("Google Sign-In"),
        onPressed: (){
          _signIn()
            .then((FirebaseUser user) => print(user))
            .catchError((e) => print(e));
        },
      ),

I already deleted the Firebase-Project on the google dev console online and created a new one. Also I tried the anonymous login -> worked fine

Any help is appreciated

Answer 1

I just ran into the same issue. This is how I solved it.

1) Get your SHA1 certificate key. (see https://developers.google.com/android/guides/client-auth)

2) Place the SHA1 key in your Firebase console

3) Rebuild your flutter App and try again. It should be working now.