This is android client for personal gps tracking system with firebase.
You can update location real-time with arduino hardware or use this client.
Update private or send public for friend.
Source code and tutorial:http://vidieukhien.xyz/vi/2018/03/13/tutxay-dung-he-thong-dinh-vi-gps-thoi-gian-thuc-voi-firebase-database-polymer-web-components/