Personally I would not use GWT-RPC then because you would have to port the client side serialization/deserialization of GWT-RPC to Android and maybe in the future even iOS if you want a native iOS app as well. So you should stick to a more standard serialization that can easily be created/consumed by any platform. Normally people choose a REST like backend with pure JSON encoding.
In general you could also use GWT RequestFactory which should also be useable on Android but I am not sure how easy you can port that to iOS if you ever want to.
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