Android以编程方式绘制ImageView

我正试图在画布中绘制一个图像。在构造函数中：

this.Icon = new ImageView(context);
this.Icon.SetImageResource(Resource.Drawable.icon);
this.Icon.LayoutParameters = new ViewGroup.LayoutParams(width, height);

并且在OnDraw:中

protected override void OnDraw(Canvas canvas)
{
    this.Icon.SetX(x);
    this.Icon.SetY(y);
    this.Icon.RequestLayout();
    this.Icon.Draw(canvas);
}

它没有出现。我是不是错过了什么？

我的类扩展了View

Bitmap bitmap = BitmapFactory.DecodeResource(Resources, Resource.Drawable.icon);
var scaledBitmap = Bitmap.CreateScaledBitmap(bitmap, w, h, false);
canvas.DrawBitmap(scaledBitmap, x, y, paint);