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>John also makes a good point about Xamarin being overkill if you're only going to be targeting one platform, Android. However, my argument for using Xamarin is that the code and the development environment will be something familiar, C# and Visual Studio. And what happens if you don't use Xamarin and then they want the app for iOS too?
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if you start with Android and are NOT certain to cover iOS or WinMobile, in theory it should be possible to build an android app with clearly separated GUI and biz tiers and if needing to switch over reuse the java code in the Xamarin java VM. As the java code is compiled into IL, all [data] structures from java should be accessible to Xamarin forms and other code. From cursory reading almost all things in java 7 covered, but no first hand knowledge. Some glue code expected then, but no need to jump into Xamarin now, unless C# is compelling (and it still IMO is better than java).