In this talk, I'm giving you 5 useful tips of RxJava you might not know. Reference - Subscriptions#empty() http://reactivex.io/RxJava/javadoc/rx/subscriptions/Subscriptions.html#empty() - SerialSubscription http://reactivex.io/RxJava/javadoc/rx/subscriptions/SerialSubscription.html - Observable#compose(Transformer) http://reactivex.io/RxJava/javadoc/rx/Observable.html#compose(rx.Observable.Transfo