Overlay Bitmap

private class Target : Java.Lang.Object, ITarget
        {
            // Bitmap PlaceHolder { get; set; }
            private ImageView View { get; set; }

            // Bitmap ErrorHolder { get; set; }
            private Bitmap Overlay { get; set; }

            public Target(ImageView view, Bitmap overlay)
            {
                //PlaceHolder = placeholder;
                View = view;
                Overlay = overlay;
            }

            public void OnBitmapFailed(Drawable drawable)
            {
                View.SetImageDrawable(drawable);
            }

            public void OnBitmapLoaded(Bitmap source, Picasso.LoadedFrom p1)
            {
                var result = PutOverlay(source, Overlay);

                View.SetImageBitmap(result);
            }

            public void OnPrepareLoad(Drawable drawable)
            {
                View.SetImageDrawable(drawable);
            }

            private Bitmap PutOverlay(Bitmap bmp1, Bitmap overlay)
            {
                Bitmap bmOverlay = Bitmap.CreateBitmap(bmp1.Width, bmp1.Height, Bitmap.Config.Argb8888);
                Canvas canvas = new Canvas(bmOverlay);
                Paint paint = new Paint(PaintFlags.FilterBitmap);

                int x = (bmp1.Width - overlay.Width) / 2;

                int y = (bmp1.Height - overlay.Height) / 2;
                canvas.DrawBitmap(bmp1, new Matrix(), null);
                canvas.DrawBitmap(overlay, x, y, new Paint());

                return bmOverlay;
            }
        }