App Engine connected to Android Device

Trying to implement google accounts login to my application and searching through internet information about Android and Google App Engine I found an interesting Google Talk event.

In that session two engineers from Google presented a new feature, App Engine Tooling for Android. It's a complete set of Eclipse-based Java development tools for building Android applications that are backed by App Engine.

Just create a new application "App Engine connected to Android device" and Eclipse make 2 projects: Android application and App Engine Application who provide a simple example of communication between the GAE server and the client application. 

The interesting part is that this kind of application takes care of authentication with Google account and implementation of C2DM protocol, so basically you just login with your gmail account on both sides (server - GAE and client - Android App) and then you establish a communication between those two entities. Then you can send messages from the server to client.

The basic architecture of the "framework" looks very similar to a wide range of applications:

Unfortunately this is not suitable for my work because as my mentor says "it's not a good ideea to combine RPC with REST Architecture".

Anyway it was nice to "play" with this project and try to understand how it works, even though it took more than 5 hours to build and deploy it.