Flutter：未为类“ FirebaseAuth”定义方法“ signInWithGoogle”

Question

I am trying to add a google sign in to my flutter application, but the method googleSignIn always shows the red squiggly lines. When I hover my mouse over it, it says:

The method 'signInWithGoogle' isn't defined for the class FirebaseAuth.

What is the solution to this problem?

I have added and imported all the required dependencies.

The dependencies I use are:

google_sign_in: ^3.2.4
firebase_auth: ^0.7.0

I don't use the latest available dependency versions because of AndroidX Compatibility issue

Answer 1

In newer versions it works a little differently:

add dependency:

google_sign_in: ^4.0.1:
firebase_auth: ^0.8.1

After:

final GoogleSignIn googleSignIn = GoogleSignIn();

final FirebaseAuth firebaseAuth = FirebaseAuth.instance;

Future<FirebaseUser> signInWithGoogle() async {
final GoogleSignInAccount googleAccount = await googleSignIn.signIn();
final GoogleSignInAuthentication googleAuth = await googleAccount.authentication;
final AuthCredential credential = GoogleAuthProvider.getCredential(
  accessToken: googleAuth.accessToken,
  idToken: googleAuth.idToken,
);
return firebaseAuth.signInWithCredential(credential);

}

Of course all Firebase settings should be made as given in the lib documentation: firebase_auth