ItemTouchHelper不启动刷卡

我在onswape方法中放置了一个put断点,但当我尝试滑动时,它甚至没有到达那里。我做了一个新项目,刚刚实现了一个带有一些视图持有者的随机回收视图。我附加了ItemTouchHelper,我也遇到了同样的问题。

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    val model = ViewModelProviders.of(this)[ViewModel::class.java]
    val dues = model.dues
    val adapter = Adapter<Due>(R.layout.card_view_dues, fragmentManager!!)
    dues.observe(this,
        Observer<MutableList<Due>> {
            adapter.list = it
        }
    )
    val itemTouchHelper = object: SimpleCallback(0, LEFT and RIGHT) {
        override fun onMove(
            recyclerView: RecyclerView,
            viewHolder: RecyclerView.ViewHolder,
            target: RecyclerView.ViewHolder
        ) = false

        override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
            dues.value?.removeAt(viewHolder.adapterPosition) //set breakpoint here
            adapter.notifyDataSetChanged()
        }
    }
    ItemTouchHelper(itemTouchHelper).attachToRecyclerView(recyclerView)
    recyclerView.apply {
        layoutManager = LinearLayoutManager(activity!!.applicationContext)
        setHasFixedSize(false)
        this.adapter = adapter
    }
}

我还替换了:

ItemTouchHelper(itemTouchHelper).attachToRecyclerView(recyclerView)

ItemTouchHelper(itemTouchHelper).attachToRecyclerView(activity!!.findViewById<RecyclerView>(R.id.recyclerView))

但似乎还是不起作用。可能出了什么问题?