How to write a mobile client?

Question

Mobile development

How and what is the best way to write such a client:
There is a restful web service, it needs a client, both mobile (Android, ios) and desktop (Windows). Moreover, the client must work offline with a local database (sqlite etc), and if there is a network, it must be synchronized using a web service.
?
I understand that muzzles, most likely, will have to be made for each platform, but it would be great to have a common library with business logic.
Now I look towards the general dll on Mono.

Answer 1

Judging by the description provided, your project fits well with Xamarin. But be aware that it's not cheap.

Answer 2

Do not try to unify, this will not lead to good.

Answer 3

If the volume of simultaneously displayed data is not very large and there are no complex graphics / animations, then why not HTML? PhoneGap will collect for all platforms.
Also, Q.T.

Answer 4

Mono is a good choice.

Answer 5

A variant with a local web application is possible (Application Cache + localStorage)

Answer 6

And what, there is a complex business logic? According to my development practice, GUI and integration always eat up many times more time. Own software logic is usually easy to write and rewrite in any language - the main thing is to have a clear description of it.