The Google+ platform for Android lets you authenticate a user
with the same credentials they use on Google every day. Once a user signs in with Google,
you can create more engaging experiences and drive usage of your app.
Google+ Sign-In is a simple, trusted, and secure way to let people sign in
to your app with their Google credentials and bring along their Google+ info.
Access the profile and social graph
Once users have signed in with Google, your app can welcome them by name,
display their picture, connect them with friends, and lots more.
Access the social graph.
Stand out in the stream
Interactive posts is a rich way of sharing to Google+. It lets users prompt friends
to take specific actions in your app from a Google+ post, like "listen," "RSVP," "check-in,"
and over 100 more actions. Post interactive content.
Add a native +1 button so users can recommend content from your app. These endorsements
can give your app more credibility and help it grow faster. Add the +1 button.
1. Get the Google Play services SDK
The Google+ Android APIs are part of the Google Play services platform.
Once you've installed the Google Play services package, you can run the Google+ sample located in
<android-sdk>/extras/google-play-services/samples/plus. However, before
you can run the sample, you need to register your app in the Google APIs Console.