RxJava常用操作符startWith、merge、concat、zip、combineLatest、retryWhen
1.startWith:给你被观察者的数据流前再增加一点同类型的数据或者增加一个数据流startWith.pngObservable.just("a","b","c").startWith("呵呵","哦哦").subscribe(newAction1(){@Overridepublicvoidcall(Strings){Log.e("Tag","call:"+s);}});orObservabl