Convert iPhone App to Android App

We have an iPhone App that we need ported to other smartphone platforms. We are in the process of finalizing the app and should have it ready for release within two weeks. Needs the same feature/functionality on the other platforms. The winning designer/developer will need to consider and explain how we will be able to update/maintain parity with the various platforms as new releases/enhancements in the software as well as the platform become available.