Mobile development

I need an Android app. I already have a design for it, I just need it to be built. we need Mumbai based developers who can work on our sports based app. we have all the major screens ready. the app involves login/Signup via FB/Gmail, finding friends via FB/Google, Notification and Recent activity timeline hub, creating and managing events/teams, connecting with other friends, reading news from various sources, Backend login to be made for individual sports centres/shops with app showcasing their activities, Backend full control for admin. the developer preferably a team should have developed such an app with similar features before.