PagerAdapterUpdated.kt

class PagerAdapter(private val activity: FragmentActivity) : FragmentStateAdapter(activity) {

    private val items: ArrayList<PagerItem> = arrayListOf()

    override fun createFragment(position: Int): Fragment =
        PagerFragment.newInstance(items[position])

    override fun getItemCount() = items.size

    override fun getItemId(position: Int): Long {
        return items[position].id.toLong()
    }

    override fun containsItem(itemId: Long): Boolean {
        return items.any { it.id.toLong() == itemId }
    }

    fun setItems(newItems: List<PagerItem>) {
        items.clear()
        items.addAll(newItems)
        notifyDataSetChanged()
    }
}