Why submitlist didn't show the list when run the app? [Kotlin]

Question

I am trying to display recyclerview list data using adapter. So far there is no error and I think my code logic is correct, but it didn't show the list when I run the app.

Below is my MainActivity code

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    val activityMainBinding = ActivityMainBinding.inflate(layoutInflater)
    setContentView(activityMainBinding.root)
    setSupportActionBar(activityMainBinding.mainToolbar)
    binding = activityMainBinding.contentMain

    val rv = binding.recyclerView
    val clickListener = { view: View, bandName:String ->
        //Deal with click feature later, show the list first
    }
    adapter = RVAdapter(clickListener)
    rv.adapter = adapter
    rv.layoutManager = LinearLayoutManager(this)
    adapter.submitlist(bandResources.values.toMutableList())

Below is my RVAdapter code

class RVAdapter(private val clickListener: (view:View, bandName: String)->Unit)
    : ListAdapter<BandInfo,RVAdapter.ViewHolder>(Diff())
{    
    inner class ViewHolder(val bandRowBinding : BandRowBinding)
        : RecyclerView.ViewHolder(bandRowBinding.root) {
        init {
            bandRowBinding.root.setOnClickListener{
                //Deal with click feature later, show the list first
            }
        }
    }    
    private var bands = mutableListOf<BandInfo>()   
    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
        val bandRowBinding = BandRowBinding.inflate(LayoutInflater.from(parent.context),
            parent, false)
        return ViewHolder(bandRowBinding)
    }    
    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        val binding = holder.bandRowBinding
        bands[position].let{
            binding.bandTitle.text = it.name
            binding.bandCreated.text = it.time
        }
    }    
    fun submitlist(items: MutableList<BandInfo>){
        bands = items
    }

Where did I go wrong?

Answer 1

When using ListAdapter, you don't need to store the Band list in adapter.

And you don't need to declare another submitlist function because ListAdapter already had it, just simply call submitList() function from ListAdapter itself.