Cannot resolve symbol default_web_client_id in Firebase's Android Codelab

Question

I am trying to learn Firebase, so I went through the Android Codelab. The project they gave me however, had an error:

Cannot resolve symbol default_web_cl

Answer 1

Fixed after using this link to create my backend id to Google API.

https://developers.google.com/identity/sign-in/android/start-integrating#get_your_backend_servers_oauth_20_client_id

• 1- Open the Credentials page in the API Console.

• 2- The Web application type client ID is your backend server's OAuth 2.0 client ID.

After this, you can re-download your json file and android studio will automatically matching your string id.