Logix is a simple registration and login system.It's not all secure but it can withstand a lot.
Logix exposes server side APIs written using PHP while interacting with a MySQL database to store newly registered users and login them in from an android application.The server sends data to the application in JSON format.
The application itself is very simple;all it does is enabling a registered user to log in and display a little bit information about them. It also supports registration.
This project misses few things which aren't a big deal and I am too lazy to fix them. Also the code misses few key comments. I will try to find time to patch it up, otherwise contact me if you're stuck somewhere.