Signature Pad in Android via Custom Renderer approach

I was able to use the Custom renderer approach, in Xamarin forms to display a Signature Pad on the iOS platform.

I used this tutorial for that: https://blog.xamarin.com/using-custom-uiviewcontrollers-in-xamarin-forms-on-ios/

This is how the code looks at the moment:

In the shared code

namespace PCL.CustomControls
{
    public class SignaturePad:ContentPage
    {
        public SignaturePad()
        {
            BackgroundColor = Color.Red;
        }
    }
}

In the iOS platform specific project: (This works great)

[assembly: ExportRenderer(typeof(SignaturePad), typeof(SignaturePad_iOS))]
namespace PCL.iOS.CustomRenderer
{
    public class SignaturePad_iOS:PageRenderer
    {
        public override void ViewDidLoad()
        {
            base.ViewDidLoad();
            var signature = new SignaturePadView(View.Frame);
            signature.StrokeColor = UIColor.Red;
            signature.SignatureLineColor = UIColor.Black;
            signature.BackgroundColor = UIColor.Yellow;
            View.AddSubview(signature);

        }
    }
}

For Android I am trying the following, unfortunately I cannot use OnCreate, so that has put me in trouble in Xamarin Forms in this scenario:

[assembly: ExportRenderer(typeof(SignaturePad), typeof(SignaturePad_Droid))]
namespace PCL.Droid.CustomRenderer
{
    public class SignaturePad_Droid:PageRenderer
    {
base.OnCreate (bundle);

    var signature = new SignaturePadView (this) {
        LineWidth = 3f
    };
    AddContentView (signature,
        new ViewGroup.LayoutParams (ViewGroup.LayoutParams.FillParent, ViewGroup.LayoutParams.FillParent));

    }
}

Can someone help me with the Droid imp0lementation.

Thanks