我正在尝试使我 Android 应用的原生端与 Flutter 进行通信。
这是在 Flutter 端的代码：
```dart
static const platform = const MethodChannel('getHallInfo');
@override
void initState() {
  testing().then((String lst) {
    setState(() {
      if (lst != null) str = lst;
    });
  });
  super.initState();
}
@override
Widget build(BuildContext context) {
  return Column(
    children: <Widget>[Text(str)],
  );
}
static Future<String> testing() async {
  String lst;
  try {
    lst = await platform.invokeMethod('getHalls');
  } catch (e) {
    print(e.toString());
  }
  return lst;
}

private static final String CHANNEL = "getHallInfo";
super.configureFlutterEngine(getFlutterEngine());
GeneratedPluginRegistrant.registerWith(getFlutterEngine());
new MethodChannel(getFlutterEngine().getDartExecutor().getBinaryMessenger(), CHANNEL).setMethodCallHandler(new MethodChannel.MethodCallHandler() {
  @Override
  public void onMethodCall(MethodCall methodCall, MethodChannel.Result result) {
    if (methodCall.method.equals("getHalls")) {
      String mm = "Succeeded";
      System.out.println("Entered");
      result.success(mm);
    }
  }
});

name: flutterModule
description: A new flutter module project.
version: 1.0.0+1
environment:
 sdk: ">=2.1.0 <3.0.0"
dependencies:
 flutter:
  sdk: flutter
cupertino_icons: ^0.1.3
flutter_svg: ^0.17.4
google_fonts: ^1.1.0
intl: ^0.16.1
dev_dependencies:
 flutter_test:
  sdk: flutter
flutter:
 uses-material-design: true
assets:
- assets/icons/
module:
 androidX: true
 androidPackage: com.example.flutterModule
 iosBundleIdentifier: com.example.flutterModule

MissingPluginException(No implementation found for method getHalls on channel getHallInfo)

<details>
<summary>英文:</summary>
I am trying to make the native side of my android app to communicate with Flutter.
This is on the Flutter side:
    static const platform = const MethodChannel(&#39;getHallInfo&#39;);
    @override
    void initState() {
    testing().then((String lst) {
      setState(() {
        if (lst != null) str = lst;
      });
    });
    super.initState();
    }
    @override
    Widget build(BuildContext context) {
    return Column(
      children: &lt;Widget&gt;[Text(str)],
    );
    }
    static Future&lt;String&gt; testing() async {
    String lst;
    try {
      lst = await platform.invokeMethod(&#39;getHalls&#39;);
    } catch (e) {
      print(e.toString());
    }
    return lst;
    }
And this is on the native Java:
    
    private static final String CHANNEL = &quot;getHallInfo&quot;;
    super.configureFlutterEngine(getFlutterEngine());
    GeneratedPluginRegistrant.registerWith(getFlutterEngine());
    new MethodChannel(getFlutterEngine().getDartExecutor().getBinaryMessenger(), CHANNEL).setMethodCallHandler(new MethodChannel.MethodCallHandler() {
            @Override
            public void onMethodCall(MethodCall methodCall, MethodChannel.Result result) {
                if (methodCall.method.equals(&quot;getHalls&quot;)) {
                  String mm= &quot;Succeeded&quot;;
                  System.out.println(&quot;Entered&quot;);
                    result.success(mm);
                }
            }
        });
My Pubspec.yaml:
    name: flutterModule
  
    description: A new flutter module project.
    version: 1.0.0+1
    environment:
     sdk: &quot;&gt;=2.1.0 &lt;3.0.0&quot;
    dependencies:
     flutter:
      sdk: flutter
    cupertino_icons: ^0.1.3
    flutter_svg: ^0.17.4
    google_fonts: ^1.1.0
    intl: ^0.16.1
 
    dev_dependencies:
     flutter_test:
      sdk: flutter
    flutter:
     uses-material-design: true
    assets:
    - assets/icons/
 
    module:
     androidX: true
     androidPackage: com.example.flutterModule
     iosBundleIdentifier: com.example.flutterModule
This is the error I get:
&gt; MissingPluginException(No implementation found for method getHalls on channel getHallInfo)
**Note:** &quot;Entered&quot; is shown on the terminal
**Edit:** These are the things that I tried:
1. Run flutter clean
2. Run flutter upgrade
3. Restart the app
But this exception persists. 
</details>
# 答案1
**得分**: 1
你只需要停止应用然后重新启动它。
确保在停止应用之前执行了 `pub get`。
使用以下命令：
```bash
flutter pub get

Flutter clean