MainActivity.kt

class MainActivity : AppCompatActivity() {
  private val numbersObservable: BehaviorSubject<List<Int>>
          = BehaviorSubject.createDefault(listOf(0, 1, 2, 3, 4, 5, 6, 7, 8, 9))

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

    swipeRefreshLayout.setOnRefreshListener {
      numbersObservable.onNext(listOf(1, 2, 4, 5, 6, 7, 8, 9)) // pass a new list without 0, 3
    }

    numbersObservable.subscribe {
      adapter.submitList(it)
    }
  }
}