Products Google APIs for Android Reference com.google.android.gms.fido.u2f Interfaces U2fPendingIntent Interface for apps to launch a PendingIntent. Classes U2fApiClient The entry point for interacting with the regular app U2F APIs. 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 14, 2017.