the provider instance cannot be obtained correctly in methodChannel.setMethodCallHandler

[huxiaofan1223]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce

class MainActivity : FlutterActivity() {
    private final val CHANNEL = "com.example/mediaControl";
    private lateinit var flutterEngine: FlutterEngine;
    lateinit var channel:MethodChannel;
    private fun invokeToFlutter(val: String) {
        channel.invokeMethod(
            "invokeToFlutter",
            val
        )
    }
    override fun onCreate(savedInstanceState: Bundle?) {
        flutterEngine = FlutterEngine(this);
        flutterEngine.getDartExecutor().executeDartEntrypoint(DartExecutor.DartEntrypoint.createDefault());
        channel = MethodChannel(flutterEngine.getDartExecutor().getBinaryMessenger(), CHANNEL);
        Handler().postDelayed({
            invokeToFlutter("countAdd");
        }, 3000)
        super.onCreate(savedInstanceState)
    }
}

void main() {
  runApp(
    MultiProvider(
      providers: [
        ChangeNotifierProvider(create: (_) => Counter()),
      ],
      child: const MyApp(),
    ),
  );
}
class Counter with ChangeNotifier, DiagnosticableTreeMixin {
  int _count = 0;
  int get count => _count;
  void increment() {
    _count++;
    notifyListeners();
  }
}
class MyApp extends StatelessWidget {
  const MyApp({super.key});
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}
class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});
  final String title;
  @override
  State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
  @override
  void initState() {
    super.initState();
    const MethodChannel _channel = MethodChannel('com.example/mediaControl');
    _channel.setMethodCallHandler((call) async {
      switch (call.method) {
        case 'invokeToFlutter':
          if (call.arguments == 'countAdd') {
            Provider.of<Counter>(context, listen: false).increment();
            print('receive: countAdd');
            print('receive: ${Provider.of<Counter>(context, listen: false).count}');
          }
          break;
        default:
          throw UnimplementedError();
      }
    });
  }
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text('${context.watch<Counter>().count}')
          ],
        ),
      )
    );
  }
}

Expected behavior
The increment method was called，but the count was not updated
It seems like the instance of Counter was taken incorrectly

Where was the problem with my code

[rrousselGit]

Provider has nothing to do with MethodChannels. For general help requests, consider using StackOverflow or Discord