This is the Web Server that need to create the login system for those projects.
1.https://github.com/LGLTeam/Login-Java-Php-Mysql-Android/ 2.https://github.com/LGLTeam/Android-Login-Form-Java-2 and any other php based login system.
I have made a video tutorial for that! Check it out!
Tutorial:-
Add login.php to your server that supports PHP, use 000webhost.com for free webserver. Repo based hosting such as Github does not support PHP
Change URL on public String sUrl on MainActivity.java file