<How to control items in RecyclerView by select th...

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How to control items in RecyclerView by select this items in Spinner in Kotlin?
I have added Spinner in actionBar and fill it with some items like (first, third...) and when choose item like (third) how to get third section in RecyclerView to come to top screen? also when scroll in RecyclerView sections how to change in Spinner depend on RecyclerView sections? And where do that in Activity or RecyclerView Adapter?
In RecyclerView Adapter:
class ParentAdapter(private val list: List) :
RecyclerView.Adapter() {

inner class MyViewHolder(val viewDataBinding:...