How to use Unity scripts in Android project?

I'd appreciate if someone could advise on my problem.

I have a Unity AR project, which simply contains one Image target with a 3D object placed on it. My goal was to implement some behavior when image target gets detected (show some UI for example).

I got a C# script for my ImageTarget that works fine:

public class ImageTargetTrack : MonoBehaviour,  ITrackableEventHandler {

    //class implementation..

    public void OnTrackableStateChanged(                                     TrackableBehaviour.Status previousStatus,                                     TrackableBehaviour.Status newStatus)     {         if (newStatus == TrackableBehaviour.Status.DETECTED ||             newStatus == TrackableBehaviour.Status.TRACKED ||             newStatus == TrackableBehaviour.Status.EXTENDED_TRACKED)         {             // show create button                 }         else         {             // hide create button                  }     }

}

Now, I'd like to understand, is it possible to implement the same code in Android project, which was exported by Unity (and not using Vuforia SDK for Android)? In short, I want to integrate  Android UI with Unity by showing/hiding Android button.

Thank you in advance.