java - .concatMap() 启动下一个 Observable 但前一个还没有完成

Question

我在 Android 上使用 RxJava。我在这里有一段非常简单的代码： Observable> observable =

Observable.create((ObservableOnSubscribe<Observable<Boolean>>) emitter1 -> {
                            emitter1.onNext(doSomething());
                            emitter1.onComplete();
                        }).concatMap(accessToken -> Observable.create((ObservableOnSubscribe<Observable<Boolean>>) emitter2 -> {                                                            
                            emitter2.onNext(doSomethingElse());
                            emitter2.onComplete();
                        }).observeOn(Schedulers.io()).subscribeOn(Schedulers.io()));

我想做的事=>

-> Start A
    -> A is processing
    -> A is ending
-> Start B
    -> B is processing
    -> B is ending

我实际上得到了什么：

-> Start A 
   -> A is processing
-> Start B
   -> B is processing
-> A is ending
-> B is ending 

但是我认为 concatMap 正在等待第一个 observable 结束，然后再启动下一个 ...？

Answer 1

请尝试这样：

Observable.create((ObservableOnSubscribe<Observable<Boolean>>) emitter1 -> {
                            emitter1.onNext(doSomething());
                            emitter1.onComplete();
                        }).concatMap(accessToken -> Observable.create((ObservableOnSubscribe<Observable<Boolean>>) emitter2 -> {                                                            
                            emitter2.onNext(doSomethingElse());
                            emitter2.onComplete();
                    })).observeOn(Schedulers.io()).subscribeOn(Schedulers.io());