Developed by Java, and implement Firebase API (Authentication, Database, Storage, Functions). 1. It could send friend notification to other users. 2. When become friends, you could send messages to each other. 3. It could show friend's online status. 4. Friend's invitation list could show records of other user friend request to you and your friend request to others. 5. It could change image profile, name, and status. Video demo: https://youtu.be/05tGPzvun98 Project detailed PPT introduction: https://docs.google.com/presentation/d/1s8YKVeZVmEVPSfzCtEo9jHaiZEKzfV8xK3fNLsAjPp4/edit?usp=sharing GitHub: https://github.com/EyesHuang/Chat