Should use Rxjava to implement an event bus to get rid of Otto bus

[ltn614]

Since you use Rxjava，don't bother to use Otto，implement an Rxbus use Rxjava is so easy，please refer http://nerds.weddingpartyapp.com/tech/2014/12/24/implementing-an-event-bus-with-rxjava-rxbus/

and here is example: https://github.com/kaushikgopal/RxJava-Android-Samples/blob/master/app/src/main/java/com/morihacky/android/rxjava/rxbus/RxBus.java

Any way great work!