如何从android_alarm_manager创建的隔离中调用MethodChannel？

public class AlarmManagerBridge {
    private static MethodChannel methodChannel;

    public static void initMethodChannel(MethodChannel channel) {
        methodChannel = channel;
    }

    // Other methods for handling MethodChannel calls
}

public class AlarmManagerBridge {
    // ...

    public static void scheduleAlarm(int id, long triggerAtMillis) {
        // Perform the necessary operations using AlarmManager
        // ...

        // Send the result back to Flutter using MethodChannel
        methodChannel.invokeMethod("onAlarmScheduled", null);
    }

    // Other methods for handling MethodChannel calls
}

import 'package:flutter/services.dart';

final MethodChannel _methodChannel = MethodChannel('com.example.alarm_manager_bridge');

void scheduleAlarm(int id, int triggerAtMillis) {
  try {
    await _methodChannel.invokeMethod('scheduleAlarm', {'id': id, 'triggerAtMillis': triggerAtMillis});
  } on PlatformException catch (e) {
    // Handle any errors that occur during the method call
    print('Error: ${e.message}');
  }
}

// Other code

public class MainActivity extends FlutterActivity {
    private static final String CHANNEL = "com.example.alarm_manager_bridge";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Initialize MethodChannel
        MethodChannel methodChannel = new MethodChannel(getFlutterEngine().getDartExecutor().getBinaryMessenger(), CHANNEL);
        AlarmManagerBridge.initMethodChannel(methodChannel);

        // Other code
    }

    // Other code
}