Flutter 未更新ChangeNotifierProvider的侦听器

我尝试了多个

ChangeNotifierProvider

（

final xyz=provider.of（context）

，

Consumer

）的实现，但无法在我的侦听器/消费者中接收更新的列表。它总是返回一个空列表

I/flutter ( 4410): []

在我的闪屏中，我正在从providers/digital\u heromes.dart调用

digitalheromes（）.getheromes（）

。它调用函数并打印cms中新英雄列表的长度，即1，因此我知道，

\u英雄

列表正在提供者类中更新

下面是现有的实现

型号/数码英雄.dart

class DigitalHero {
  String name;
  String title;
  String title_extended;
  String phone_number;
  String email_address;
  double location_lat;
  double location_long;
  String image;
  String bio;
  Map<String, dynamic> related_projects;
  DigitalHero({
    this.name,
    this.title,
    this.title_extended,
    this.phone_number,
    this.email_address,
    this.location_lat,
    this.location_long,
    this.image,
    this.bio,
    this.related_projects,
  });

  static DigitalHero fromJson(Map<String, dynamic> json) {
    return DigitalHero(
      name: json['name'] as String,
      title: json['title'] as String,
      title_extended: json['title_extended'] as String,
      phone_number: json['phone_number'] as String,
      email_address: json['email_address'] as String,
      location_lat: json['location_lat'] as double,
      location_long: json['location_long'] as double,
      image: json['image'] as String,
      bio: json['bio'] as String,
      related_projects: json['related_projects'] as Map<String, dynamic>,
    );
  }

  Map<String, dynamic> toJson() => {
        'name': name,
        'title': title,
        'title_extended': title_extended,
        'phone_number': phone_number,
        'email_address': email_address,
        'location_lat': location_lat,
        'location_long': location_long,
        'image': image,
        'bio': bio,
        'related_projects': related_projects,
      };
}

---

我终于弄明白了。我正在创造一个全新的数字英雄形象

await DigitalHeroes().getHeroes();

而不是像这样使用继承的实例

await Provider.of<DigitalHeroes>(context, listen: false).getHeroes();

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {

    return ChangeNotifierProvider<DigitalHeroes>( //tried with multiprovider, no change
      create: (ctx) => DigitalHeroes(),
      child: MaterialApp(
        title: 'xyz',
        theme: ThemeData(
          primarySwatch: Colors.blue,
        ),
        debugShowCheckedModeBanner: false,
        home: MyHomePage(title: 'Home'),
        routes: {
          Splash.routeName: (ctx) => Splash(),
          Onboarding.routeName: (ctx) => Onboarding(),
          Login.routeName: (ctx) => Login(),
          BottomTabsScreen.routeName: (ctx) => BottomTabsScreen(),
          Home.routeName: (ctx) => Home(),
          DigitalHeroesScreen.routeName: (ctx) => DigitalHeroesScreen(),
          
        },
      ),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    Singleton.instance.screenSize = MediaQuery.of(context).size;
    return Container(
      child: Padding(
        padding: EdgeInsets.only(top: MediaQuery.of(context).padding.top),
        child: Splash(),
      ),
    );
  }
}

void initData() async {
    setState(() {
      _loading = true;
    });
    // ignore: await_only_futures
    await DigitalHeroes().getHeroes();

    setState(() {
      _loading = false;
    });
    if (!_loading && !_animating) {
      Navigator.of(context).pushReplacementNamed(Onboarding.routeName);
    }
  }

await DigitalHeroes().getHeroes();

await Provider.of<DigitalHeroes>(context, listen: false).getHeroes();

class Heroes extends ChangeNotifier {
  List _heroes;

  void getData() async {
    // Loading Assets
   _heroes=heroes;
    notifyListeners();
  }

  Heroes() {
    getData();
  }
}