For saving your time, three packages are offered in gig to give you a quick estimate of required time/cost. Kindly have a look at them. If you are sure that your requirements are falling in one of the packages order, feel free to place an order other wise just ask in inbox with a small description of your requirements, I will be there to answer your quires as soon as possible.
Following are the terms used in my packages description
Activity : Single screen shown in android app (Splash, login /sign up screen, view posts etc)
Database Table : A database table storing the related information to use later in app (User's posts, email, passwords etc)
Database Query : An act of fetching or storing data to database (Adding new user, authenticating user etc)
Requirements related to Pornography/nudity, gambling, hacking, music, school assignment or any immoral / illegal activitywill not be entertained