我有一个Observable，我想定期重复，但仅限于以下条件:apiInterface.getData()//returnsObservable...//processingishappeninghere.toList().repeatWhen(completed->{if(autoReload){//Repeatevery3secondsreturncompleted.delay(3,TimeUnit.SECONDS);}else{return???//WhatdoIhavetoreturnthatitdoesnotrepeat?}}).subscribe(list->callbac