flutter_riverpod 3.0.0-dev.3

A simple way to access state from anywhere in your application while robust and testable.

example/lib/main.dart

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

// A Counter example implemented with riverpod

void main() {
  runApp(
    // Adding ProviderScope enables Riverpod for the entire project
    const ProviderScope(child: MyApp()),
  );
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(home: Home());
  }
}

/// Providers are declared globally and specify how to create a state
final counterProvider = StateProvider((ref) => 0);

class Home extends ConsumerWidget {
  const Home({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    return Scaffold(
      appBar: AppBar(title: const Text('Counter example')),
      body: Center(
        // Consumer is a builder widget that allows you to read providers.
        child: Consumer(
          builder: (context, ref, _) {
            final count = ref.watch(counterProvider);
            return Text('$count');
          },
        ),
      ),
      floatingActionButton: FloatingActionButton(
        // The read method is a utility to read a provider without listening to it
        onPressed: () => ref.read(counterProvider.notifier).state++,
        child: const Icon(Icons.add),
      ),
    );
  }
}