多供应商不能在扑朔迷离的物质应用程序中工作？

没有错误下面的测试代码的工作，你可以用你的情况下，测试
使用

Consumer

MaterialApp

程式码片段

return MultiProvider(      providers: [        ChangeNotifierProvider<Posts>(          create: (context) => Posts(),        ),        ChangeNotifierProvider<Settings>(          create: (context) => Settings(darkModeEnabled: true),        ),      ],      child: Consumer<Settings>(builder: (_, settings, child) {        return MaterialApp(          darkTheme:   settings.darkModeEnabled ? ThemeData.dark() : ThemeData.light(),          debugShowCheckedModeBanner: false,          title: 'Blogy',          theme: ThemeData( primaryColor: Colors.deepPurple[900], cursorColor: Colors.deepPurple[900], accentColor: Colors.deepPurple[900], fontFamily: 'Ubuntu',          ),          home: SplashScreen(),        );      }),    );

完整的测试代码

import 'package:flutter/material.dart';import 'package:provider/provider.dart';void main() => runApp(MyApp());class Posts extends ChangeNotifier {}class Settings extends ChangeNotifier {  bool darkModeEnabled;  Settings({this.darkModeEnabled});}class MyApp extends StatelessWidget {  @override  Widget build(BuildContext context) {    return MultiProvider(      providers: [        ChangeNotifierProvider<Posts>(          create: (context) => Posts(),        ),        ChangeNotifierProvider<Settings>(          create: (context) => Settings(darkModeEnabled: true),        ),      ],      child: Consumer<Settings>(builder: (_, settings, child) {        return MaterialApp(          darkTheme:   settings.darkModeEnabled ? ThemeData.dark() : ThemeData.light(),          debugShowCheckedModeBanner: false,          title: 'Blogy',          theme: ThemeData( primaryColor: Colors.deepPurple[900], cursorColor: Colors.deepPurple[900], accentColor: Colors.deepPurple[900], fontFamily: 'Ubuntu',          ),          home: SplashScreen(),        );      }),    );  }}class SplashScreen extends StatefulWidget {  SplashScreen({Key key}) : super(key: key);  //final String title;  @override  _SplashScreenState createState() => _SplashScreenState();}class _SplashScreenState extends State<SplashScreen> {  int _counter = 0;  void _incrementCounter() {    setState(() {      _counter++;    });  }  @override  Widget build(BuildContext context) {    return Scaffold(      appBar: AppBar(        title: Text("test"),      ),      body: Center(        child: Column(          mainAxisAlignment: MainAxisAlignment.center,          children: <Widget>[ Text(   'You have pushed the button this many times:', ), Text(   '$_counter',   style: Theme.of(context).textTheme.display1, ),          ],        ),      ),      floatingActionButton: FloatingActionButton(        onPressed: _incrementCounter,        tooltip: 'Increment',        child: Icon(Icons.add),      ),    );  }}