Sample Activity showing the use of ListAdapter

ListAdapterActivity.kt

class MainActivity : AppCompatActivity() {

    private val adapter = SampleListAdapter()
    private var list: ArrayList<Item>? = null

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

        recyclerview.layoutManager = LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false)
        recyclerview.adapter = adapter
        updateAdapter()
        
        addBtn.setOnClickListener {
            val newList = ArrayList<Item>()
            newList.addAll(list!!)
            val random = Random().nextInt(200)
            val item = Item(random, "New item added ","")
            newList.add(1,item)
            adapter.submitList(newList)
        }

        removeBtn.setOnClickListener {
            val newList = ArrayList<Item>()
            newList.addAll(list!!)
            adapter.submitList(newList)
        }

    }

    private fun updateAdapter() {
        list = ArrayList()
        for(i in 0..9) {
            val item = Item(i, "Item $i",
                    "")
            list?.add(item)
        }

        progressBar.visibility = View.GONE
        adapter.submitList(list)
    }
}