How to write a cross-platform application for iOS, Windows Phone and Android with bluetooth 3.0 and maps?

Question

Mobile development

I wrote a bluetooth 3.0 android application (security sensors) in Java. The bosses ("*[email protected]#[email protected]%^!") now want it to be for both ios and windows phone, the application itself is not complicated and consists of three activations and shows the status of the sensors, but uses Google Maps and Yandex Maps.
How can I write support for Android and iOS bluetooth in QT (Windows Phone, as I understand it, is not supported by Qt yet). Please tell me where to go in solving this problem. You probably need to use JNI somehow, but how then to use Maps? Or is it better to write everything in what is native for each platform?

Answer 1

Move towards Xamarin.
There will be support for winphone, and cards and bluetooth.
Also C#.

Answer 2

Of course, C# rules and as I understand it, there is Mono for Yossi in general. I tried Intel's XDK. of course cool, but how to use iron there is not entirely clear not only to me