Using D in Android App

[Justice via Digitalmars-d-learn]

Is it difficult to create a D business like app and connect it to 
android through java for the interface?

I'd rather create all the complex stuff in D and either use it 
natively through java(I need a UI).

If it is workable, can the same be said for IOS(just recompile 
the D source to the IOS architecture then use it in an IOS app 
for the ui)?