provider_poc.dart

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

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: '',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Home(),
    );
  }
}

class Home extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return ChangeNotifierProvider(
      builder: (context) => SomeModel(),
      child: Scaffold(
        appBar: AppBar(
          title: Text('Provider Poc'),
        ),
        body: Consumer<SomeModel>(
          builder: (context, someModel, _) => RaisedButton(
                onPressed: () {
                  Navigator.push(
                      context,
                      MaterialPageRoute(
                        builder: (_) => Provider.value(
                              value: someModel,
                              child: OtherWidget(),
                            ),
                      ));
                },
                child:
                    Text('Go to Other widget', style: TextStyle(fontSize: 20)),
              ),
        ),
      ),
    );
  }
}

class OtherWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    var sm = Provider.of<SomeModel>(context);

    return Scaffold(
      appBar: AppBar(
        title: Text('Provider POC'),
      ),
      floatingActionButton: FloatingActionButton(onPressed: () {
        sm.somethingEnabled = !sm.somethingEnabled;
      }),
      body: Padding(
        padding: EdgeInsets.all(20),
        child: Row(
          children: <Widget>[
            Checkbox(
              value: sm.somethingEnabled,
              onChanged: (bool value) {},
            ),
          ],
        ),
      ),
    );
  }
}

class SomeModel extends ChangeNotifier {
  var _somethingEnabled = false;

  get somethingEnabled => _somethingEnabled;
  set somethingEnabled(bool v) {
    _somethingEnabled = v;
    notifyListeners();
  }
}