Many people use FirebaseUI 3.2.2 in this project but in first time when start develop this project , i've use Firebase 1.2.0 , so in this tutorial , i will show you how to update to latest FirebaseUI and Play Services , Firebase
In the first part of this tutorial, we will learn how to implement the Presence system, which allows us to see which users are online, and we will only track who is online.
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