How implement sticky footer in recyclerview

Question

I have RecyclerView and I need next behavior:

• if there are a lot of items (more then fits screen) - footer is last item
• if few item/no item - footer is lo

Answer 1

class FooterViewHolder(private val parent: ViewGroup) {

...

fun bind(item: Item) {
    ...
    itemView.post(::adjustTop)
}

private fun adjustTop() {
    val parent = parent as RecyclerView
    var topOffset = parent.height
    for (child in parent.children) topOffset -= child.height
    (itemView.layoutParams as ViewGroup.MarginLayoutParams)
        .setMargins(0, topOffset.coerceAtLeast(0), 0, 0)
}
}