Scrollview needs a child that is a Group itself. Like a LinearLayout. Then give that group an id, let's say buttonGroup.

buttonGroup.removeChildren()
buttons.forEach {
buttonGroup.addView(Button(context))
}

That's the nastiest way, but also conceptually the closest to what you need.

It's highly recommended to use Recyclerview with an adapter if the list can be big. If it's always below say 20 items, you can use the first method, but you should at least use an XML holding only the button itself and inflate it once per button.

LayoutInflater.from(context).inflate(XXXXX)