Convert observable to list

Question

I am using RxJava.

I have an Observable<T>. How do I convert it to List<T>?

Seems to be a simple operation, but I couldn't find it anywhere on the net.

Answer 1

Hope this helps.

List<T> myList = myObservable.toList().toBlocking().single();

thanks

anand raman

Answer 2

You can use toList() or toSortedList() . For e.g.

observable.toList(myObservable)
          .subscribe({ myListOfSomething -> do something useful with the list });

Answer 3

RxJava 2+:

List<T> = theObservarale
             .toList()
             .blockingGet();

Answer 4

You can also use the collect operator:

    ArrayList list = observable.collect(ArrayList::new, ArrayList::add)
                               .toBlocking()
                               .single();

With collect, you can choose which type of Collection you prefer and perform an additional operation on the item before adding it to the list.