Why BehaviorSubject requires default value?

I often need BehaviorSubject that don’t have default value and should not spawn values until first value is supplied.

Currently as a workaround I initialize it with null and provide access to it after filter that ignores null value. Which looks ugly.

private BehaviorSubject<Location> locationUpdateSubject = BehaviorSubject.create((Location) null);

    public Observable<Location> getLocationUpdates() {
        return locationUpdateSubject.filter(new Func1<Location, Boolean>() {
            @Override
            public Boolean call(Location location) {
                return location != null;
            }
        });
    }

[akarnokd]

Hi. A parameterless create() has been already added to BehaviorSubject with v0.19.

[akarnokd]

You have the wrong repository then. I suggest asking question on their site or StackOverflow about this.