https://ferrand-d.medium.com/paging-image-gallery-with-recyclerview-f059d035b7e7

PagingImageGallery_scrollToPosition.kt

vh.imageView.setOnClickListener {
    val rv = vh.imageView.parent as RecyclerView
    rv.smoothScrollToCenteredPosition(position)
}

fun RecyclerView.smoothScrollToCenteredPosition(position: Int) {
    val smoothScroller = object : LinearSmoothScroller(context) {

        override fun calculateDxToMakeVisible(view: View?,
                                              snapPref: Int): Int {
            val dxToStart = super.calculateDxToMakeVisible(view, SNAP_TO_START)
            val dxToEnd = super.calculateDxToMakeVisible(view, SNAP_TO_END)

            return (dxToStart + dxToEnd) / 2
        }
    }

    smoothScroller.targetPosition = position
    layoutManager?.startSmoothScroll(smoothScroller)
}