RxJava2 combine Observable<List<>> and Observable - rx-java2

Question

I'm still learning RxJava 2, and I'm struggling to build an Observable<List<>> based on two Observables.
The goal is to build an Observable<List<Schedule>>.
I have the observables Observable<List<Channel>> getChannels() (= channel list) and Observable<Schedule> getSchedule(long channelId) (= schedule for a channel).
Here my current Observable, that is not emitting onNext():
Observable<List<Schedule>> oSchedules = getChannels()
.flatMapIterable(channel -> channel)
.flatMap(c -> getSchedule(c.id()))
.toList()
.toObservable();
Observable<Schedule> getSchedule(long channelId)
{
...
}
Observable<List<Channel>> getChannels()
{
...
}
That is working fine, and emitting my data:
Observable<Schedule> oSchedule = getChannels()
.flatMapIterable(d -> d)
.flatMap(i -> getSchedule(i.id(), start, end));
EDIT
The ToList() is only called onComplete of the Observable, that's why it wasn't working.

Answer 1

The ToList() is only called onComplete of the Observable, that's why it wasn't working. Thanks to #akarnokd, this is what I ended up with.
getChannels()
.take(1)
.flatMapIterable(c -> c)
.flatMap(channel -> getSchedule(channel.id(), start, end)
.take(1))
.toList()
.toObservable()