My answer below is a general answer and i would advise this even if it weren't for Android but for mobile (connection limited devices) in general: I would vote for a RESTful/HATEOAS web-service exchange of information. The format of the RESTful data can be JSON. It's a good choice. If you implement a proper RESTful interface between your server and client, you can just use HTTP caching to store/cache data on your device.
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