I'm developing an app using Xamarin's HCE feature. The project structure is as follows. hceSample hceSample.Android hceSample.iOS
I am implementing hce simulation code called hceService in hceSample, not hceSample.Android. A function called Enable_Card exists in the hce service, and you want to use the NfcFCardEmulation.EnableService function in that function. Activity and ComponentName are requested as parameters of the function. The ComponentName area was handled easily, but I don't know how to get the Activity. Please advise.
This is the contents of enable_Card function of hceService.

private Activity activity = null;
private bool enable_Card(cardModel card)
        {
            try
            {
                sid = card.cardSN;
                tag = "Felica";
                emulation.EnableService(, componentName); //<- How to get Activity??
                emulation.SetNfcid2ForService(componentName, sid);

                return true;
            }
            catch
            {
                return false;
            }
        }

This is my first time asking a question on Stackoverflow. I would appreciate it if you could point out any missing or incorrect parts.
I trying this

1. activity = Xamarin.Essentials.Platform.CurrentActivity; //<- this function is not found!
   Added missing information! The namespace of the Enable_Card function is located in hceSample.Service.