Application Development for smartphone

Hello I’ve a site running since 2003, It is an adult site. I would like to create an application for smartphone It should be similar to GRINDR or BENDER which are free and are applications for Android, Iphone, Blackberry Since the site is already operative, I’m wondering if it is possible gather some information from the already existing profiles in order to allow our users to be immediely operative If it is possible we would like having a small bottom banner as appear on Bender in the page where all users on line are listed.