ToDoKotlin - MainActivity.kt (with Anko DSL)

MainActivity.kt

class MainActivity : AppCompatActivity() {

    val todoListAdapter = TodoListAdapter()

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        verticalLayout {
            recyclerView {
                val orientation = LinearLayoutManager.VERTICAL
                layoutManager = LinearLayoutManager(ctx, orientation, false)
                addItemDecoration(DividerItemDecoration(ctx, LinearLayout.VERTICAL))
                adapter = todoListAdapter
            }.lparams(width = matchParent,
                    height = dip(0),
                    weight = 1f)

            val editText = editText {
                hint = "Add note..."
            }

            button {
                text = "Add"
                onClick {
                    val note = editText.asString()
                    todoListAdapter.add(note)
                    editText.clear()
                }
            }
        }
    }
}