This is the android client for this project's server : https://github.com/Scriptopathe/project-sopra
In order to specify the good Rest API server, you need to edit the Constantes.java file located in app/src/main/java/com/example/dorian/sopraandroid/
And change the following line:
public static final String SERVER = "[ADDRESS:PORT]";
By replacing [ADDRESS:PORT] with the value you need.
Note that if your server is at example.com and and the API at example.com/api, you should just put example.com because the software automatically add the /api.