Do I have to unsubscribe from completed observable?

Question

If an observable completes, do I still have to unsubscribe / dispose (in RxJava2) the observable to remove the Observer (prevent memory leaks) or is this handled internally by R

Answer 1

Yes you are correct.

After a stream is terminated ( onComplete / onError has been called ), subscriber unsubscribes automatically. You should be able to test these behaviors using isUnsubscribed() method on the Subscription object.