observable - Rxjava retryWhen 延迟不触发重试

Question

Observable<Integer> call = Observable.create(emitter -> {
    emitter.onNext(1);
    emitter.onError(new Throwable("Error"));
});

call
.retryWhen(throwableObservable -> throwableObservable)
.subscribe(integer -> System.out.println(integer), throwable -> System.out.println(throwable.getMessage()));

此代码按预期工作（不断打印“1”），但如果我将其更改为：

.retryWhen(throwableObservable -> throwableObservable.delay(1, TimeUnit.SECONDS))

它只会打印一次'1'并且不会重试。