试图在小部件树之外监听值？提供者

Question

我在两个类中使用提供程序，一个工作正常，另一个不工作。我在 main.dart 文件中初始化了提供程序，如下所示

P.S（PersonalPostingService 是一个 chopper 服务）但它在其他类中工作正常

 Widget build(BuildContext context) {
    return Provider(
        create: (_) => PersonalPostingService.create(),
        dispose: (context, PersonalPostingService service) =>
            service.client.dispose(),
        child: MaterialApp(
          home: WeeklyData(),
        ));
  }

使用提供程序调用函数时出现以下错误

E/flutter (16561): This is likely caused by an event handler (like a button's onPressed) that called
E/flutter (16561): Provider.of without passing `listen: false`.
E/flutter (16561):
E/flutter (16561): To fix, write:
E/flutter (16561): Provider.of<PersonalPostingService>(context, listen: false);
E/flutter (16561):
E/flutter (16561): It is unsupported because may pointlessly rebuild the widget associated to the
E/flutter (16561): event handler, when the widget tree doesn't care about the value.
E/flutter (16561):
E/flutter (16561): The context used was: FormClass

这是我调用提供者的地方（Statlesswidget 类）

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        // ignore: deprecated_member_use
        child: RaisedButton(
            child: Text("Send"),
            onPressed: () async {
              await Provider.of<PersonalPostingService>(context)
                  .postPersonal(data);
            }),
      ),
    );
  }

如果我添加 Listen:false，它就会这样做

Launching lib\main.dart on vivo 1906 in debug mode...
lib\main.dart:1
√  Built build\app\outputs\flutter-apk\app-debug.apk.
Error waiting for a debug connection: The log reader stopped unexpectedly
Error launching application on vivo 1906.
Exited (sigterm)

Answer 1

您可以使用 MultiProvider

Widget build(BuildContext context) {
    return MultiProvider(
          providers: [
          Provider(create: (context) => new Provider1()),
          Provider(create: (context) => new Provider2()),
          Provider(create: (context) => new Provider3()),
        ],
        dispose: (context, PersonalPostingService service) =>
            service.client.dispose(),
        child: MaterialApp(
          home: WeeklyData(),
        ));
  }

和

await Provider.of<Provider1>(context,listen:false)
                  .postPersonal(data);