Rx变换可观察 <List<T> &gt;至可观察 <T>

Question

I have Observable<List<T>> observable that emits many List<T> instances. I want to transform observable to return all T items in single list.

The specific questions is:

How to transform Observable<List<T>> to Observable<T> ?

Answer 1

Use this:

observable.flatMapIterable(collection -> collection)

Keep in mind that this too does not guarantee order.

Answer 2

Ok. It seems that flat map operator is doing desired transformation:

 observable.flatMap((List<T> ts) -> Observable.from(ts)).toList();

Answer 3

What you need is flatMap the iterable object:

observable.flatMapIterable(Functions.identity()).toList();

// or

observable.flatMap(Observable::fromIterable).toList();