Check if RecyclerView is scrollable

Question

How to check if a RecyclerView is scrollable, ie, there are items below/above the visible area

I have a dropdown in my recycler view which works by using

Answer 1

I had the same problem and the answers already posted, especially Fabios, brought me on the right track. The scrollRange does not support paddings though, so they need to taken into account as well if your Recyclerview has a padding.

I'm using the following extension property in Kotlin now to determine whether or not the view is scrolling.

/**
 * computes whether the RecyclerView's content is larger than the view container, i.e. whether or not the user can scroll
 * returns null if either layout manager or adapter is not yet set or an incompatible layout manager is used (Linear- & GridLayoutManager work)
 */
val RecyclerView.canScroll: Boolean?
    get() {
        // if there's no adapter set, we don't know yet whether or not the view is scrollable
        if (adapter == null) return null
        val manager = layoutManager as? LinearLayoutManager ?: return null
        if (manager.orientation == RecyclerView.HORIZONTAL) {
            return computeHorizontalScrollRange() + paddingLeft + paddingRight > width
        }
        return computeVerticalScrollRange() + paddingTop + paddingBottom > height
    }