I check google talk api and it uses XMPP.
Here http://code.google.com/appengine/docs/java/xmpp/overview.html#Sending_Chat_Messages
I read about integrating into my Android app. Does anyone know any good tutorials on using the Google APIs for Android?
Is it also necessary to integrate the engine application?
All you need is XMPP on Android. Then you can use GTalk like any other XMPP server , but remember to specify the full JID (for example, user@gmail.com ") as the login.
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