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Intermediate

How do you manage state in a Flutter application?

State management in Flutter refers to the way we manage the state of our application to ensure a responsive user interface. Various approaches exist for state management, including Provider, Riverpod, and Bloc.

Here’s a simple step-by-step guide using the Provider package:

  1. Add Dependency: Include the Provider package in your pubspec.yaml file.
  2. Create a Model: Define a class that holds your app's state.
  3. Wrap Your App: Use the ChangeNotifierProvider to wrap your main app widget.
  4. Consume State: Use Consumer widget to access the state in your widgets.

Example code snippet:

class Counter with ChangeNotifier {
  int _count = 0;
  int get count => _count;
  void increment() {
    _count++;
    notifyListeners();
  }
}

// In main.dart:
void main() {
  runApp(ChangeNotifierProvider(
    create: (context) => Counter(),
    child: MyApp(),
  ));
}