如何在flutter中使用bloc架构访问配置文件

dependencies:
  flutter:
    sdk: flutter
  bloc: ^7.0.0
  flutter_bloc: ^7.0.0

import 'package:bloc/bloc.dart';

class ConfigBloc extends Bloc<ConfigEvent, ConfigState> {
  // TODO: 实现配置文件的读取和管理逻辑
}

abstract class ConfigEvent extends Equatable {
  const ConfigEvent();

  @override
  List<Object> get props => [];
}

class LoadConfig extends ConfigEvent {}

abstract class ConfigState extends Equatable {
  const ConfigState();

  @override
  List<Object> get props => [];
}

class ConfigLoading extends ConfigState {}

class ConfigLoaded extends ConfigState {
  final Map<String, dynamic> config;

  const ConfigLoaded(this.config);

  @override
  List<Object> get props => [config];
}

class ConfigError extends ConfigState {
  final String message;

  const ConfigError(this.message);

  @override
  List<Object> get props => [message];
}

import 'dart:convert';
import 'dart:io';

class ConfigBloc extends Bloc<ConfigEvent, ConfigState> {
  @override
  ConfigState get initialState => ConfigLoading();

  @override
  Stream<ConfigState> mapEventToState(ConfigEvent event) async* {
    if (event is LoadConfig) {
      yield ConfigLoading();
      try {
        final file = File('config.json');
        final contents = await file.readAsString();
        final config = json.decode(contents);
        yield ConfigLoaded(config);
      } catch (e) {
        yield ConfigError('Failed to load config file');
      }
    }
  }
}

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

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: BlocProvider(
        create: (context) => ConfigBloc()..add(LoadConfig()),
        child: HomePage(),
      ),
    );
  }
}

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Config Example'),
      ),
      body: BlocConsumer<ConfigBloc, ConfigState>(
        listener: (context, state) {
          if (state is ConfigError) {
            ScaffoldMessenger.of(context).showSnackBar(
              SnackBar(content: Text(state.message)),
            );
          }
        },
        builder: (context, state) {
          if (state is ConfigLoading) {
            return Center(child: CircularProgressIndicator());
          } else if (state is ConfigLoaded) {
            final config = state.config;
            // TODO: 使用配置信息进行界面构建
            return Container();
          } else {
            return Container();
          }
        },
      ),
    );
  }
}