food_controller.dart

// get location to api 
//  

class FoodCartController {
  final List positions = [];
  constructor() {
    final service = singltonService();
    service.initState()
  }

}

singltonService() {
  List positions = [];

  syncServer(position) {
    try {
      sendToServer(data)
      .then((response) {
        positions = [];
      });
    } catch (e){
      snackBar.showMessage(e.message, 2000);
    }
  }
  initState() {
    getDeviceLocation().listen((location)  {
      if (DeviceNetworkStatus == DeviceStatus.Online) {
        List data = [];
        if (positions.isNotEmpty) {
          data = positions;
        }
        data.add(location);
        syncServer(data);
      } else {
        positions.add(location);
      }
    });

    
  }

  sendToServer() {
    try {
      await http.post(url, {body: positions});
    } catch (e) {
      // handle error here.
      rethrow;
    }
  }
}