Let's start with the implementation of our Android synchronization client: we want to design a minimalistic GUI where one can choose between the two Android versions 'Gingerbread' and 'Ice Cream Sandwich'.
We also need a Button to start the synchronization, along with a TextField containing the URL of our synchronization service. Finally, a TextLabel will display progress information during the synchronization process.
The pictures below show our client application's GUI on Android Gingerbread:
![Success!](6-avd.png "Success!)
