Implement realtime online/offline status with flutter and firebase


Hy, what is the best way to show in an app if the user is online or offline?

Frontend -> Flutter

Backend -> Firestore Cloud and Firebase Auth.

I have a collection of users in firestore that contains documents. Each document is a user and contain “status” field. In flutter i can update this field every time that user sign in or log out but if you close the app it is not updated.


You can extend your statefulWidget State class with WidgetsBindingObserver like

class _HomePageState extends State<HomePage>
    with WidgetsBindingObserver

and initState method add WidgetsBinding.instance.addObserver(this);.

  void initState() {

Later overide didChangeAppLifecycleState method

  void didChangeAppLifecycleState(AppLifecycleState state) {
    if (state  AppLifecycleState.resumed)
      //TODO: set status to online here in firestore
      //TODO: set status to offline here in firestore

Answered By – Harsha pulikollu

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