RecyclerViewDragDrop.kt

class MainActivity : AppCompatActivity() {

    private val items = mutableListOf("Item1", "Item2", "Item3", "Item4", "Item5", "Item6")
    private val simpleAdapter = SimpleAdapter()
    private val itemTouchHelper = ItemTouchHelper(object : ItemTouchHelper.SimpleCallback(ItemTouchHelper.UP or ItemTouchHelper.DOWN, ItemTouchHelper.LEFT) {
        override fun onMove(
            recyclerView: RecyclerView,
            viewHolder: RecyclerView.ViewHolder,
            target: RecyclerView.ViewHolder
        ): Boolean {
            val fromPosition = viewHolder.adapterPosition
            val toPosition = target.adapterPosition
            recyclerView.adapter?.notifyItemMoved(fromPosition, toPosition)
            return true
        }

        override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
            items.removeAt(viewHolder.adapterPosition)
            list.adapter?.notifyItemRemoved(viewHolder.adapterPosition)
        }
    })

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        list.adapter = simpleAdapter
        itemTouchHelper.attachToRecyclerView(list)
        list.addItemDecoration(DividerItemDecoration(this, DividerItemDecoration.VERTICAL))
        simpleAdapter.submitList(items)
    }
}