This problem is solved with Apportable. It uses clang and Apple's Objective-c runtime and compiles for Android natively. It also bridges to that code with JNI in a nice way so it's accessible in Android. You don't have to convert to Java and there is no cost penalty in performance since it's compile for the native ARM architecture running on the device (it can even sometimes be faster than Dalvik/Java on the device). It also features a port of UIKit that maps everything fairly well.
