👀 Views: 69 💬 Answers: 1 📅 Created: 2025-06-14

flutter futurebuilder streamcontroller Dart

I'm relatively new to this, so bear with me. Quick question that's been bugging me - I'm running into an issue with `FutureBuilder` when trying to combine it with a `StreamController` in my Flutter app. The goal is to load initial data with the `FutureBuilder` and then listen to updates through a stream. However, I keep getting the error: `Error: Too many positional arguments: 0 expected, but 1 found.` This happens when I try to pass the `stream` parameter to the `FutureBuilder` constructor. Here’s a simplified version of my code: ```dart class MyWidget extends StatelessWidget { final StreamController<List<String>> _controller = StreamController<List<String>>(); Future<List<String>> _fetchData() async { // Simulating network delay await Future.delayed(Duration(seconds: 2)); return ['Item 1', 'Item 2', 'Item 3']; } @override Widget build(BuildContext context) { return FutureBuilder<List<String>>( future: _fetchData(), builder: (BuildContext context, AsyncSnapshot<List<String>> snapshot) { if (snapshot.connectionState == ConnectionState.waiting) { return CircularProgressIndicator(); } else if (snapshot.hasError) { return Text('Error: ${snapshot.error}'); } // Attempting to listen to the stream here seems to be causing the issue _controller.add(snapshot.data!); return StreamBuilder<List<String>>( stream: _controller.stream, builder: (context, streamSnapshot) { if (streamSnapshot.hasData) { return ListView.builder( itemCount: streamSnapshot.data!.length, itemBuilder: (context, index) { return ListTile(title: Text(streamSnapshot.data![index])); }, ); } return Text('No data available'); }, ); }, ); } } ``` I've confirmed that `FutureBuilder` is properly returning the future, but when I try to build the stream, the error pops up. I've also made sure to have the correct imports and dependencies in my `pubspec.yaml`, including `flutter: sdk: flutter` and the latest version of the Dart SDK. Is there a specific reason why `FutureBuilder` does not accept a `stream` parameter, or am I missing something in my implementation? Any help would be greatly appreciated! This is part of a larger application I'm building. This is part of a larger application I'm building. Is there a better approach?