Flutter Provider Package - State Management Made Easy

The Flutter Provider package is a popular state management library that simplifies the way you manage and share state in your Flutter app. It uses the InheritedWidget and ChangeNotifier classes to efficiently propagate changes throughout your app. 

In this tutorial, you will learn how to use Provider to manage state in your Flutter app and avoid common pitfalls that arise when managing state manually.

Code Sample:

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

// Define your data model
class CounterModel with ChangeNotifier {
  int _count = 0;

  int get count => _count;

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

void main() {
  runApp(
    // Wrap your app in the Provider widget
    ChangeNotifierProvider(
      create: (context) => CounterModel(),
      child: MyApp(),
    ),
  );
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Provider Demo',
      home: Scaffold(
        appBar: AppBar(
          title: Text('Flutter Provider Demo'),
        ),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Text(
                'You have pushed the button this many times:',
              ),
              // Use the Provider.of method to access your data model
              Consumer(
                builder: (context, counter, child) => Text(
                  '${counter.count}',
                  style: Theme.of(context).textTheme.headline4,
                ),
              ),
            ],
          ),
        ),
        floatingActionButton: FloatingActionButton(
          onPressed: () {
            // Use the Provider.of method to call methods on your data model
            Provider.of(context, listen: false).increment();
          },
          tooltip: 'Increment',
          child: Icon(Icons.add),
        ),
      ),
    );
  }
}

Properties:

• The Provider package uses the InheritedWidget and ChangeNotifier classes to efficiently propagate changes throughout your app.
• Provider is a lightweight and easy-to-use state management library that simplifies the way you manage and share state in your Flutter app.
• By using Provider, you can avoid common pitfalls that arise when managing state manually, such as spaghetti code and unnecessary rebuilds.
• Provider supports multiple data models and provides a convenient way to access and update them using the Provider.of method.