home_page.dart

import 'package:flutter/material.dart';
import 'package:flutter_app/non_working_sample.dart';
import 'package:flutter_app/repository.dart';
import 'package:flutter_app/working_sample.dart';
import 'package:flutter_bloc/flutter_bloc.dart';

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Samples'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            ElevatedButton(
              onPressed: () => Navigator.push(
                context,
                MaterialPageRoute(
                  builder: (_) => RepositoryProvider(
                    create: (_) => Repository(),
                    child: WorkingSample(),
                  ),
                ),
              ),
              child: const Text('Working Sample'),
            ),
            ElevatedButton(
              onPressed: () => Navigator.push(
                context,
                MaterialPageRoute(builder: (_) => NonWorkingSample()),
              ),
              child: const Text('Non Working Sample'),
            ),
          ],
        ),
      ),
    );
  }
}

main.dart

import 'package:flutter/material.dart';
import 'package:flutter_app/home_page.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: HomePage(),
    );
  }
}

non_working_sample.dart

import 'package:flutter/material.dart';
import 'package:flutter_app/repository.dart';
import 'package:flutter_bloc/flutter_bloc.dart';

class NonWorkingSample extends StatefulWidget {
  @override
  _NonWorkingSampleState createState() => _NonWorkingSampleState();
}

class _NonWorkingSampleState extends State<NonWorkingSample> {
  Repository _repo;

  @override
  void initState() {
    _repo = context.read<Repository>();
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return RepositoryProvider(
      create: (_) => Repository(),
      child: Builder(
        builder: (context) {
          return Scaffold(
            appBar: AppBar(),
            body: SafeArea(
              child: Center(
                child: Text(_repo.getNonWorkingSample()),
              ),
            ),
          );
        },
      ),
    );
  }
}

pubspec.yaml

name: flutter_app
description: A new Flutter application.


version: 1.0.0+1

environment:
  sdk: ">=2.7.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter

  bloc: ^6.1.0
  flutter_bloc: ^6.1.1

  cupertino_icons: ^1.0.0

dev_dependencies:
  flutter_test:
    sdk: flutter

flutter:

  uses-material-design: true
  

repository.dart

class Repository {
  String getWorkingSample() => 'Working sample';

  String getNonWorkingSample() => 'Non working sample';
}

working_sample.dart

import 'package:flutter/material.dart';
import 'package:flutter_app/repository.dart';
import 'package:flutter_bloc/flutter_bloc.dart';

class WorkingSample extends StatefulWidget {
  @override
  _WorkingSampleState createState() => _WorkingSampleState();
}

class _WorkingSampleState extends State<WorkingSample> {
  Repository _repo;

  @override
  void initState() {
    _repo = context.read<Repository>();
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: SafeArea(
        child: Center(
          child: Text(_repo.getWorkingSample()),
        ),
      ),
    );
  }
}