RecyclerViewExample.kt

class MainActivity : AppCompatActivity() {

    private lateinit var linearLayoutManager: LinearLayoutManager
    private lateinit var viewAdapter: RecyclerView.Adapter<*>

    private var dataset: List<String> = listOf("zero", "one", "two", "three", "four", "five", "six", "seven", "nine", "ten")

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

        initRecyclerView()
    }

    private fun initRecyclerView() {
        linearLayoutManager = LinearLayoutManager(this)
        viewAdapter = ExampleAdapter(dataset)

        recyclerView.layoutManager = linearLayoutManager
        recyclerView.adapter = viewAdapter

        recyclerView.setHasFixedSize(true)
    }
}

class ExampleAdapter(private val dataset: List<String>) : RecyclerView.Adapter<ExampleAdapter.ExampleViewHolder>() {

    class ExampleViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
        val exampleTextView: TextView = itemView.findViewById(R.id.item_textview)
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ExampleViewHolder {
        val view = LayoutInflater.from(parent.context).inflate(R.layout.rv_element, null)
        return ExampleViewHolder(view)
    }

    override fun getItemCount() = dataset.size

    override fun onBindViewHolder(holder: ExampleViewHolder, position: Int) {
        holder.exampleTextView.text = dataset[position]
    }
}