This is a snippet in how to Convert <Android.Graphics.Drawables.Icon> to <Android.Graphics.Drawables.Drawable> [c#] [Android][Xamarin.Android]

convertanicon.cs

//Static: No need to make an instance to call this method.
// Receives two arguments:
//Icon: the Icon to convert:
//Paquete: Package of the app where the icon resides, needed to retrieve an icon from another application.

public static Drawable ReturnActionIconDrawable(Icon icon, string paquete)
        {
        //New Context field.
            Context remotePackageContext = null;
            //Create a context using the package passed in <paquete>
            remotePackageContext = Application.Context.CreatePackageContext(paquete, 0);
            //Using Icon#LoadDrawable(<Context>)
            return icon.LoadDrawable(remotePackageContext);
        }

//If is for retrieving Icons from our Own app you can just:

public static Drawable ReturnActionIconDrawable(Icon icon)
        {
            return icon.LoadDrawable(Application.Context); <-- Xamarin.Android.
            return icon.loadDrawable(getApplicationContext()); <--Java
        }