在视图的构造函数中使用View. getparent ()

Why doesn't this work?

为什么不工作呢?

private ScrollView findScrollParent(View v)
{

    if(v==null)
    {
        return null;
    }
    else if(v instanceof ScrollView)
    {
        return (ScrollView) v;
    }
    else
    {
        return findScrollParent((View)v.getParent());
    }
}

CustomView(Context context, AttributeSet as)
{
     super(context,as);
     ScrollView sv = findScrollParent(this);
}
private Scr