List -> itr -> toList -> subscribe -> recyclerview.adapter = adapter

rx-with-retrofit-fragment-code-sample.kt

class TpcsFgmt : Fragment() {
   override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        val sLoadingVisible = RxView.visibility(loadingTextView, View.INVISIBLE)
        val sRVVisible = RxView.visibility(list, View.INVISIBLE)
        val sIsLoading = BehaviorSubject.createDefault(false)

        sIsLoading.observeOn(AndroidSchedulers.mainThread()).subscribe { loading ->
            sLoadingVisible.accept(loading)
            sRVVisible.accept(!loading)
        }

        Zaif.client.currencyPairObs()
                .doOnSubscribe   { sIsLoading.onNext(true) }
                .doAfterTerminate{ sIsLoading.onNext(false) }
                .flatMapIterable { data -> data }
                .map { item -> convertTpcItem(item) }
                .toList()
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe { items ->
                    list.layoutManager = LMng(view.context)
                    list.adapter = TpcsAdptr(
                            items,
                            createVH = { vg -> vg.createVH(R.layout.vh_tpc, sIntrvl, sRng) },
                            bindVH   = { tpc, vh ->
                                vh.ttl.text =  tpc.ttl
                                vh.dtil.text = tpc.dtil
                                vh.item = tpc
                            },
                            itemCnt = { cchdItems -> cchdItems.size }
                    )
                }
    }

}