OnActivityResult

Ok, I am at a bit lost on how to use the "OnActivityResult" on Xamarin.Forms.

I have a Class that implements a custom Xamarin.forms Interface that does the work of interacting with the camera and photo gallery to get images from the device.

my class looks something like this:

public class Media : IMedia
{
        Activity context;

        /// <summary>
        /// Initializes a new instance of the class.
        /// </summary>
        public Media()
        {
            context = Forms.Context as Activity;

            //Check for Camera intent
            takePictureIntent = new Intent (MediaStore.ActionImageCapture);
            //context.StartActivityForResult (takePictureIntent, 0);

            //Check for gallery intent
            pickPictureIntent = new Intent();
            pickPictureIntent.SetType ("image/*");
            pickPictureIntent.SetAction (Intent.ActionGetContent);
            //context.StartActivityForResult (Intent.CreateChooser(Intent, "Select Picture"), 1);

            if (context.PackageManager.HasSystemFeature (PackageManager.FeatureCamera)) {
                IsCameraAvailable = true;
                IsPhotosSupported = true;
                IsVideosSupported = true;
            }

        }

        protected override void OnActivityResult (int requestCode, Result resultCode, Intent data)
        {
            switch (requestCode) {
            case 0:
                if (resultCode == Result.Ok) {
                    var selectedImage = data.Data;
                    //imageview.setImageUri(selectedImage);
                }
                break;
            case 1:
                if (resultCode == Result.Ok) {
                    var selectedImage = data.Data;
                    //imageview.setImageUri(selectedImage);
                }
                break;
            }
        }
}

I can easily make the Media class into a child of Activity, but it would be null as I don't know of a way to pass the current Forms.Context to the child. my other issue is that I need to override the OnActivityResult function, but I either don't have access or is null. How can I interact with the OnActivityResult while using the current context of the Xamarin.Forms application.