Google+ Hangouts API - Google+ Platform — Google Developers
Google+ Hangouts API
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The Google+ Hangouts API allows you to develop collaborative apps that run inside of a Google+ Hangout. Hangout apps behave much like normal web apps, but with the addition of the rich, real-time functionality provided by the Hangouts APIs. Apps have the ability to control aspects of the user interface, synchronize data between hangout participants, and respond to various events in the hangout.
We are launching the Hangouts API initially as a Developer Preview. We'll be gathering feedback during this early phase and using it to rapidly improve the API, so be aware that functionality is likely to change. You'll find that we've added additional tools directly in the hangout itself to help you build your apps more quickly.
Getting started is easy. First, build your app or just start with one of our pre-built examples like Talking Heads, which changes your avatar into a talking Android of your choice. Next, register it in the APIs Console, and tell us who on your team should be able to load your app. Then, start a hangout with your app!
As always, if you have any questions, please let us know.