iPhone App rebuild to Android App

Recently we have developed a new iPhone-App for one of our clients. Its and app with on-board camera control, lybrary-access and address-book acces. The app can create front and back-side of an postcard to be send to our server. The card contains an image at the front and a message and addressee-details at the back. Also the app builds its own library so that send cards can be edited and sent again. Now we need this app to be converted/rebuild for the Android platforms. Pls send us your company-details, reference projects and cost-estimate. Cyriel