未处理异常:ServicesBinding.defaultBinaryMessenger在绑定初始化之前被访问

有解决这个问题的办法吗?

堆栈跟踪：

[VERBOSE-2:ui_dart_state.cc(148)] Unhandled Exception: ServicesBinding.defaultBinaryMessenger was accessed before the binding was initialized.
If you're running an application and need to access the binary messenger before `runApp()` has been called (for example, during plugin initialization), then you need to explicitly call the `WidgetsFlutterBinding.ensureInitialized()` first.
If you're running a test, you can call the `TestWidgetsFlutterBinding.ensureInitialized()` as the first line in your test's `main()` method to initialize the binding.
#0      defaultBinaryMessenger.<anonymous closure> (package:flutter/src/services/binary_messenger.dart:73:7)
#1      defaultBinaryMessenger (package:flutter/src/services/binary_messenger.dart:86:4)
#2      MethodChannel.binaryMessenger (package:flutter/src/services/platform_channel.dart:140:62)
#3      MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:314:35)
<asynchronous suspension>
#4      MethodChannel.invokeMapMethod (package:f<…>

当前回答

在我的例子中，当使用方向时，

解决前:

void main() {
SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp]).then((_).{
runApp(MyApp());
});
}

解决用途:

void main() {
WidgetsFlutterBinding.ensureInitialized();
SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp])
  .then((_) {
runApp(MyApp());
});
}

重点是在主类的第一行中添加WidgetsFlutterBinding.ensureInitialized()

2020-01-19 10:37:27

其他回答

解决方案:调用WidgetsFlutterBinding.ensureInitialized();在调用异步函数之前。


void main() async {
  WidgetsFlutterBinding.ensureInitialized();   //  ADD THIS BEFORE YOUR ASYNC FUNCTION CALL.
  await Firestore.instance.settings(...);      //  NOW YOU CAN CALL ASYNC FUNCTION.   
  ...
  runApp(
    ...
  )

2020-05-31 16:10:39

如果您从孤立对象接收到这个错误，那么接受的解决方案就不起作用，这是毫无价值的。

WidgetsFlutterBinding.ensureInitialized();

只确保在主线程上的绑定。我们正在努力消除这一限制，你可以在这里关注这个问题

https://github.com/flutter/flutter/issues/13937

2021-05-19 16:18:05

只需在main.dart中添加这一行

WidgetsFlutterBinding.ensureInitialized();

您的代码看起来像

void main() {
  WidgetsFlutterBinding.ensureInitialized();
  return runApp(MultiProvider(
    providers: [
      ChangeNotifierProvider.value(
        value: AppState(),
      )
    ],
    child: MyApp(),
  ));
}

2020-01-04 06:48:21

在我的例子中，当使用方向时，

解决前:

void main() {
SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp]).then((_).{
runApp(MyApp());
});
}

解决用途:

void main() {
WidgetsFlutterBinding.ensureInitialized();
SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp])
  .then((_) {
runApp(MyApp());
});
}

重点是在主类的第一行中添加WidgetsFlutterBinding.ensureInitialized()

2020-01-19 10:37:27

如果您正在等待main()方法，通常会发生这种情况。所以，解决方案是:

void main() {
  // add this, and it should be the first line in main method
  WidgetsFlutterBinding.ensureInitialized(); 

  // rest of your app code
  runApp(
    MaterialApp(...),
  );
}

2019-08-29 04:38:15

未处理异常:ServicesBinding.defaultBinaryMessenger在绑定初始化之前被访问

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