rxJava create ArrayList from items

Question

Im trying to do the following: 1. Get Observables from ArrayList 2. Get name field from each item of this list 3. Create new ArrayList

 @NonNull
@Override
public Observable<Response<FriendsCheckResponse>> getFriendsInApp(String query) {
    List<String> test = new ArrayList<>();
    Observable.from(getContactList())
            .map(contactItem -> {
                test.add(contactItem.getNumber());
                return null;
            })
            .subscribeOn(Schedulers.immediate())
            .observeOn(AndroidSchedulers.mainThread());

}

Why do you need an Observable for this? You can just do this with the stream-API: getContactList().stream().map(contactItem -> contactItem.getNumber()).collect(Collectors.toList());. — marstran
– marstran, Commented Sep 27, 2016 at 13:14

akarnokd · Accepted Answer · 2016-09-27 13:18:04Z

1

Use toList to collect them into one List. There is no need for subscribeOn and observeOn in this case (plus subscribeOn(immediate()) is functionally a no-op.

Observable<List<String>> numbers = Observable.from(getContactList())
    .map(v -> v.getNumber())
    .toList();

answered Sep 27, 2016 at 13:18

akarnokd

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