Android app organisation

I'm currently doing an app that will be "duplicated" for many project. The only thing that will be change for each projects, is the design (some pictures and texts).

I'm wondering if it's correct to split the project in modules, like :

• app (the root of the app, with layouts and activities)
• model (generic database)
• io (tools for getting webservices, or check network connection)
• map (manage mapView)

Thank you !

Cheers