Recyclerview 在 运行 时间不可见

Question

我使用 kotlin 语言使用数据绑定实现了一个简单的 recyclerview。 在xml里，recyclerview好像是默认的， 但是当我 运行 它时，它不会显示为默认值。 fragment 中包含的其他按钮和视图在执行时正常显示，但只有 recyclerview 不可见。哪一部分是错的？

class WorkFragment : Fragment() {

    private var _binding: FragmentWorkBinding? = null

    private val binding get() = _binding!!




    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {

        _binding = FragmentWorkBinding.inflate(inflater, container, false)
        val view = binding.root


        return view
    }


    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)


        val data = mutableListOf<WorkList>()

        val adapter = WorkAdapter()

        adapter.data = data

        binding.recycler1.adapter = adapter

        binding.recycler1.layoutManager = LinearLayoutManager(requireContext())


       

    }



    }

class WorkAdapter : RecyclerView.Adapter<WorkAdapter.ViewHolder>() {

    var data = mutableListOf<WorkList>()

    class ViewHolder(val binding: RecyclerviewWorkItemBinding) : RecyclerView.ViewHolder(binding.root) {
        fun bind(workList: WorkList) {
            binding.tvStarttime.text = workList.Starttime
            binding.tvAdmin.text = workList.Admin
            binding.tvPart.text = workList.Part
            binding.tvStoptime.text = workList.Stoptime
            binding.tvWorkers.text = workList.Workers.toString()
        }
    }


    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): WorkAdapter.ViewHolder {

        val binding = RecyclerviewWorkItemBinding.inflate(LayoutInflater.from(parent.context), parent, false)
        return ViewHolder(binding)
    }

    override fun onBindViewHolder(holder: WorkAdapter.ViewHolder, position: Int) {
        holder.bind(data[position])
    }

    override fun getItemCount(): Int {

        return data.size
    }

//    fun replaceList(newList: MutableList<WorkList>) {
//        data = newList.toMutableList()
//        notifyDataSetChanged()
//    }


}

我的代码有问题吗？ 作为参考，我只使用了一个片段，而不是 activity.

Answer 1

通常 RecyclerView 表现得像隐藏的，但实际上不是。原因是您传递的是一个空列表，因此回收站将不会扩展或显示，因为列表中没有项目。