Products Google APIs for Android Reference Api.ApiOptions.Optional public static interface Api.ApiOptions.Optional implements Api.ApiOptions.HasOptions Api.ApiOptions.NotRequiredOptions Known Indirect Subclasses GoogleSignInOptions GoogleSignInOptions GoogleSignInOptions is options used to configure the GOOGLE_SIGN_IN_API. Base interface for Api.ApiOptions that are optional. Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see our Site Policies. Java is a registered trademark of Oracle and/or its affiliates. Last updated August 7, 2019.