RxJava - two observables

Question

I've got two observables - OnPeriodChanged and OnFilterChanged, and trying to figure out how to call a function for view adapter when one of them changes. I've tried .zip, but for some reason it does not get triggered:

Observable.zip(OnPeriodChanged, OnFilterChanged, (Date, Filter) -> HistoryViewModel.getScans(Date.first, Date.second, Filter)).subscribe(scans -> histAdapter.setScans(scans));

What I can use here to invoke the getter function and pass the results from it to setter?

Answer 1

zip will emit the items to the downstream only after both of your observables ( OnPeriodChanged , OnFilterChanged ) emitted. I think you are trying to call HistoryViewModel.getScans whenever any of the item changes, with latest values of Date and Filter . You could use combineLatest instead of zip

Try changing it to

    Observable.combineLatest(OnPeriodChanged, OnFilterChanged, (Date, Filter) -> HistoryViewModel.getScans(Date.first, Date.second, Filter))
            .subscribe(scans -> histAdapter.setScans(scans));