Android: Rxjava RxAndroid Countdown timer

gistfile1.txt

//source: https://github.com/ReactiveX/RxJava/issues/3505

####Emit each item 5 seconds after the previous item:
List<Integer> list = new ArrayList<>(Arrays.asList(1, 2, 3, 4, 5, 6));
Observable
  .interval(5, TimeUnit.SECONDS)
  .map(i -> list.get(i.intValue()))
  .take(list.size())
  .toBlocking()
  .subscribe(System.out::println)
;


####Emit everything after 5 seconds passed:
Observable
  .from(list)
  .delay(5, TimeUnit.SECONDS)
  .toBlocking()
  .subscribe(System.out::println);