将Observable <List <Car >>转换为RxJava中的Observable <Car>序列

Question

Given a list of cars ( List<Car> cars ), I can do:

Observable.just(cars); //returns an Observable that emits one List<Car>
Observable.from(cars); //returns an Observable that emits a squence of Car

Is there a way I can go from an Observable of a List<Car> to a sequence of Observable<Car> ?

Something like a from without parameters

Obserable.just(cars).from()

Answer 1

You can map an Observable<List<Car>> to Observable<Car> like so:

yourListObservable.flatMapIterable(x -> x)

Note that flatMapping might not preserve the order of the source observable. If the order matters to you, use concatMapIterable . Read here for more details.

Answer 2

你可以用它

flatMap { t -> Observable.fromIterable(t) }