Using Provider for State Management

This example demonstrates how to use the Provider package for state management in a Flutter app.

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
return MaterialApp(
  title: 'Provider Example',
  theme: ThemeData(primarySwatch: Colors.blue),
  home: CounterScreen(),
);
  }
}

class Counter with ChangeNotifier {
  int _count = 0;

  int get count => _count;

  void increment() {
_count++;
notifyListeners();
  }

  void decrement() {
_count--;
notifyListeners();
  }
}

class CounterScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
return Scaffold(
  appBar: AppBar(title: Text('Counter')),
  body: Center(
    child: Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        Text('Count: ${context.watch<Counter>().count}'),
        Row(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            ElevatedButton(
              onPressed: () => context.read<Counter>().decrement(),
              child: Text('-'),
            ),
            SizedBox(width: 20),
            ElevatedButton(
              onPressed: () => context.read<Counter>().increment(),
              child: Text('+'),
            ),
          ],
        ),
      ],
    ),
  ),
);
  }
}