Simple Android group chat Android group chat uses Firebase Authentication, Database, UI and Cloud Messaging to share messages in a single chat room. How to install: 1. Download or clone this repository. 2. Connect Firebase Authentication (I used email+password authentication), Database and Firebase Cloud Messaging services in Android # Studio. 3. Go to Cloud Messaging Firebase console and copy your API key to gradle.properties. 4. In case of any build errors try to rebuild project, enjoy!