ElectronicAssistant/lib/module/record/record_task.dart

import 'package:flutter_foreground_task/flutter_foreground_task.dart';

class RecordTaskHandler extends TaskHandler {
  @override
  Future<void> onDestroy(DateTime timestamp) {
    // TODO: implement onDestroy
    return Future.value();
  }

  @override
  void onRepeatEvent(DateTime timestamp) {
    // TODO: implement onRepeatEvent
  }

  @override
  Future<void> onStart(DateTime timestamp, TaskStarter starter) {
    // TODO: implement onStart
    return Future.value();
  }
}

@pragma('vm:entry-point')
void setRecordCallback() {
  // The setTaskHandler function must be called to handle the task in the background.
  FlutterForegroundTask.setTaskHandler(RecordTaskHandler());
}