👀 Views: 67 💬 Answers: 1 📅 Created: 2025-06-14

flutter provider listview state-management Dart

I'm writing unit tests and I've been working on this all day and I'm experiencing an scenario with `ListView.builder` in my Flutter app using the provider package... After updating the state in my ChangeNotifier, the ListView does not reflect the updated items until I perform a hot restart, which is not the expected behavior. I have ensured that the ChangeNotifier is set up correctly and that the widget is listening to the provider, but it seems the ListView is not being rebuilt when the state changes. Here's a simplified version of my code: ```dart import 'package:flutter/material.dart'; import 'package:provider/provider.dart'; class ItemList extends ChangeNotifier { List<String> items = []; void addItem(String item) { items.add(item); notifyListeners(); } } class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return ChangeNotifierProvider( create: (context) => ItemList(), child: MaterialApp( home: Scaffold( appBar: AppBar(title: Text('Item List')), body: ItemListScreen(), ), ), ); } } class ItemListScreen extends StatelessWidget { @override Widget build(BuildContext context) { return Column( children: <Widget>[ Expanded( child: Consumer<ItemList>( builder: (context, itemList, child) { return ListView.builder( itemCount: itemList.items.length, itemBuilder: (context, index) { return ListTile(title: Text(itemList.items[index])); }, ); }, ), ), ElevatedButton( onPressed: () { Provider.of<ItemList>(context, listen: false).addItem('Item ${Provider.of<ItemList>(context, listen: false).items.length + 1}'); }, child: Text('Add Item'), ), ], ); } } void main() => runApp(MyApp()); ``` When I press the 'Add Item' button, the item should be added to the list, and the ListView should update accordingly. However, the items do not appear until I restart the app. I get no behavior messages in the console, and the `notifyListeners()` is definitely being called since I debugged through that part of the code. I’m using Flutter 2.10.0 and provider 6.0.0. Any insights on what might be going wrong or how I can ensure that my ListView updates properly upon changes to the state? I'm working with Dart in a Docker container on Ubuntu 20.04. Has anyone else encountered this?