Android e commerse app

I need an Android app. I would like it designed and built. i need android ecommerse android app. you can use magento or opencart for this project. need login / reguster by mobile number only. if user logged out, add to cart button should redirect user to login page and only logged in user can view the price. need location / city based product price. want to start app like "just buy live" you can download from play store for reference.