GCM

来 Google Play 网购吧！购买内容之后，立刻就可以在您的 Android 手机或平板电脑上享用，摆脱一切同步烦恼。

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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/