I am implementing a recycler view with it's items as checkbox. My data is coming from ROOM database and this recycler view is inside a dialog fragment.

Dialog Fragment :

 override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        _binding = ScheduleFloorDialogBinding.inflate(layoutInflater)
        createProfileViewModel = CreateProfileViewModel(Application())
        floorProfileDialogAdapter = FloorProfileDialogAdapter()

        binding.rvFloorsForScheduling.layoutManager = LinearLayoutManager(requireActivity())
        binding.rvFloorsForScheduling.adapter = floorProfileDialogAdapter

        return binding.root
    }

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

        val floorList: MutableList<String> = mutableListOf()

        //Getting list of all floors
        createProfileViewModel.totalFloors.observe(viewLifecycleOwner) {
            Timber.d("List of floors received : $it")

            val intList = it.map(String::toInt)
            val maxFloorValue = intList.last()
            var count = 0

            try {
                while (count <= maxFloorValue) {
                    floorList.add(count.toString())
                    count  
                }
            } catch (e: Exception) {
                Timber.d("Exception: $e")
            }
            floorProfileDialogAdapter.getAllFloors(floorList)
            Timber.d("Floor List : $floorList")
        }
    }

I am able to send list of data from here to my adapter.

Adapter:

class FloorProfileDialogAdapter() : RecyclerView.Adapter<FloorProfileDialogAdapter.MyViewHolder>() {

    var floors = emptyList<String>()

    inner class MyViewHolder(val binding: ScheduleFloorDialogItemBinding) :
        RecyclerView.ViewHolder(binding.root)

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder {
        val inflater = LayoutInflater.from(parent.context)
        val binding = ScheduleFloorDialogItemBinding.inflate(inflater, parent, false)

        return MyViewHolder(binding)
    }

    @SuppressLint("SetTextI18n")
    override fun onBindViewHolder(holder: MyViewHolder, position: Int) {
        val currentFloor = floors[position]
        Timber.d("Current floor: $currentFloor")
        holder.binding.floorCheckBox.text = "Floor $currentFloor"
    }

    override fun getItemCount(): Int {
        return floors.toString().length
    }

    fun getAllFloors(floorsReceived: List<String>) {
        Timber.d("Floors received : $floorsReceived")
        this.floors = floorsReceived
    }
}

Log inside the Adapter's getAllFloor method shows that list has been received:

But inside onBindViewHolder() when I use the position I get the error saying :

java.lang.IndexOutOfBoundsException: Empty list doesn't contain element at index 0.

CodePudding user response：

The view is already inflated when you initialized the floorProfileDialogAdapter with an empty list, it won't be changed till you use notifyDataSetChange() it's a solution which is not recommended

or Using ListAdapter from Androidx Recycler view Package: it has its own submit list so every time you submit a list it notifies data set change and it compares it with the previous one

Check documentation