Fallback Observable for RxJava

Question

I\'m in search for a better way to achieve a simple Observable fallback system for empty results when using RxJava. The idea is that, if a local query for a set of data results

Answer 1

You can concatenate your Observables as well:

Observable o1 = Observable.empty();
Observable o2 = Observable.empty();
Observable o3 = Observable.just(3);
Observable o4 = Observable.just(4);
Observable os = Observable.concat(o1, o2, o3, o4);
Integer v = os.toBlocking().first();  // returns 3