Droid Application - Based on Facebook App

This Andriod application will communicate with server (get/post) , with the current facebook application we have working . Andriod application will send request to server to fetch records and show them in our application. [login to view URL] I need a andriod application which will authenticate user at facebook, user can post ad for sale or buy, show ad listing, searching for houses and all records will save in our database.