>>> It really depends on if you will be connected to the internet when using the app or disconnected. FYI, "native" Android apps are Java.
>
>It needs to be a tablet held app with local data, there will be some interaction with the web, but it can't be a web hosted app.

How much local data ?
It might be possible to do this with HTML5 - it has quite a bit of support/ability to work offline and to use local storage.
Advantage being that you'd be better able to support multiple platforms.