Fix: Bad state: Stream has already been listened to in Flutter
A single-subscription stream accepts exactly one listen() for its whole life. Create the stream once and give it to one listener, or share it with asBroadcastStream or Stream.multi.
Tag: streams
3 posts
How to Replay the Latest Value to Late Subscribers of a Dart Stream Without rxdart's BehaviorSubject
A broadcast StreamController drops every event that fired before you subscribed. Here is a dependency-free BehaviorSubject replacement built on Stream.multi, a replayLatest() extension for existing streams, the async* shortcut that silently loses events, and the StreamBuilder initialData detail, all verified on Dart 3.12.2.
Fix: Riverpod 3.0 StreamProvider stops emitting because updates are filtered by ==
In Riverpod 3.0 every provider filters listener notifications with ==, not identity. A StreamProvider that re-emits the same mutable object stops rebuilding the UI after the first frame. Here is why it happens and three ways to fix it. Tested on flutter_riverpod 3.3.2, Flutter 3.44, Dart 3.x.