GCM

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new version is out:

https://play.google.com/store/apps/details?id=com.iapplize.gcmtest

and new code:

https://github.com/lolevsky/GCM_Chat_example

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Google Cloud Messaging for Android application.

you can test it by sending yourself or other users message by using GCM and other devices that use this application in the last 24 hours.

Requires access to user email to send other devices.

you can find the base source code of the application and server side (servlet for app engine) in the link:

http://code.google.com/p/gcm-android-and-app-engine/