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→Implementing the Sign In Method
}
}
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The code begins by comparing the result code to the one provided when the sign-in activity was started. If the code matches, the result of the sign-in operation is obtained from the result data in the form of a GoogleSignInResult object. The isSuccess() method of the result object is called to identify whether the user’s attempt to sign in using a Google account succeeded. If the sign-in was successful, the GoogleSignInAccount object for the user is extracted from the result object and passed to a yet to be implemented method named authWithFirebase(). It is within this method that the user’s Google account ID needs to be exchanged for a Firebase authentication credential.
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The code extracts the user’s Google ID token from the GoogleSignInAccount object and uses it to request a Firebase AuthCredential object from the Google authentication provider. The credential object is then used to sign into Firebase, including the creation of a new account if one does not already exist. A completion listener is attached to the request and used to notify the user of a failure should one occur.
== Signing Out ==
