基于 Flutter 的 Android 应用程序抛出 MissingPluginException（未找到通道上的方法的实现）

Question

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('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;
}

And this is on the native Java:

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);
            }

        }
    });

My Pubspec.yaml:

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

This is the error I get:

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

Note: "Entered" 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.

Answer 1

you just have to stop the app and restart it again.

make sure you did pub get before you stop your app. use the command.

flutter pub get

Answer 2

Try flutter clean

then flutter upgrade

then flutter run -v

If that doesn't work, have a look at the following issues: issue01 , issue02

I hope this will help you

Answer 3

you just need to run

Flutter clean

then again restart/run your app