BuddyPress.org

You’ve also got the problem that a lot of the API isn’t clean – it churns out presentation HTML (targeted for the bp-default theme) rather than just performing function (as you’d hope).

So, as well as adding a JSON API, you’d have the additional challenge of filtering / cleaning the API (already enough of a challenge when developing on BP for standard platforms).

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Note: if you are accessing an external API, i.e. needing the app to have an Internet connection, then you would probably be wiser to create it as an HTML5 mobile optimised site, rather than a full blown app.

If you want it to operate offline as well – then you may be better creating your own streamlined platform, that can work well within the restrictions of local data storage on the mobile.