I already know if I want to use stream listen in method to a snapshot so i need to use StreamSubscription then dispose it using .cancel();

but what if use streamBuilder under build method to get data from fisrstore, do i need to dispose it too if yes HOW ?.. or it will be disposed it self when I press back bottom ?

  @override
  Widget build(BuildContext context) {

          
          return StreamBuilder(
            stream: FirebaseFirestore.instance.collection("users").doc(widget.userId).snapshots(),
            builder: (context, snapshot)  {
              if (!snapshot.hasData) {
                return circulearProgress();

              }

CodePudding user response：

The StreamBuilder automatically manages the lifecycle of the underlying stream you pass it. You don't need to do anything for that yourself here, it will auto-close the stream (and remove the listener from Firestore) when the widget disappears from the UI that your build method returns.

Also see:

• Flutter: Streambuilder - Closing of streams
• Do I need to cancel Stream<QuerySnapshot> (flutter)