public static Disposable disposeOnCallbacksScheduler(final Runnable runnable) {
        return Disposable.fromRunnable(() -> looperCallbacksScheduler.scheduleDirect(runnable));
    }
This Scheduler is intended for queuing Geocache refreshes.
<br>
Don't use it for anything else than that.
It shall SOLELY be used by {@link cgeo.geocaching.CacheDetailActivity} and {@link cgeo.geocaching.service.CacheDownloaderService}!
main/src/main/java/cgeo/geocaching/utils/AndroidRxUtils.java