Rx - How to unsubscribe automatically after receiving onNext()?

Question

How to unsubscribe automatically after receiving onNext() ?

For now I use this code:

rxObservable
.compose(bindToLifecycle()) // unsubscribe automatically in onPause() if method was called in onResume()
.subscribe(new Subscriber<Object>() {
     ...
     @Override
     public void onNext(Object o) {
         unsubscribe();
     }
 });

The question requires more context in order for others to help you answer it. — ericmjl, Aug 11 '16 at 17:58

score 28 · Accepted Answer · answered Aug 11 '16 at 15:54

28

I you want to "unsubscribe" just after the first event, the operator take is a way to go.

 rxObservable.compose(bindToLifecycle())
             .take(1)
             .subscribe();

answered Aug 11 '16 at 15:54

dwursteisen

11,435
2
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1

Thanks. Seems like the "first()" is what I need. – Siarhei Sinelnikau Aug 11 '16 at 16:12
5

there is a subtle difference between `take(1)` and `first` : `first` emit an error with an empty stream. `take(1)` doesnt. (so you have to check which one you'll need, regarding the context) – dwursteisen Aug 12 '16 at 08:33

score 1 · Answer 2 · answered Feb 03 '17 at 08:56

1

I think this is what you need:

 rxObservable.compose(bindToLifecycle())
             .takeFirst(lifecycleEvent -> lifecycleEvent == LifecycleEvent.PAUSE);

answered Feb 03 '17 at 08:56

LenaYan

746
6
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Rx - How to unsubscribe automatically after receiving onNext()?

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