In order to configre yor Android app, follow this steps:
1. Download snipeitapp_config.php file and copy it to your Snipe-IT public directory, so it would be acceded as http(s)://snipeit.yourdomain.com/snipeitapp_config.php
2. Edit snipeitapp_config.php file and set your api key:
<?php
...
...
define("API_KEY", "Enter your api key here!!");
...
3. Open your app and go to: Settings > Snipe-IT server address
If all works fine, you will see a green notification "App configured!!"