java - Rxjava链式多于一个请求

Question

我是 RxJava 的新手。我想链接一些电话:

Observable<RoomList> listRoomsCall = mRoomServiceApi.listRooms();

//这个电话会给我RoomIds下一步是调用所有 RoomIds - 请求后请求

mMeetingServiceApi.listMeetings(roomID, startsAtString, endsAtString, free))

我应该如何将第一次调用与下一次调用联系起来？

我认为我应该使用 flatMap 并循环调用所有请求，但最后如何连接所有响应？

  listRoomsCall.flatMap(v -> {
            for (ExchangeRoom exchangeRoom : v.getExchangeRoomList()) {
               mMeetingServiceApi.listMeetings(roomID, startsAtString, endsAtString, free);
            }
        })

Answer 1

将内部列表变成一个 Observable 并在其上再次使用 flatMap:

listRoomsCall
.flatMapIterable(v -> v.getExchangeRoomList())
.flatMap(exchangeRoom -> {
    mMeetingServiceApi.listMeetings(roomID, startsAtString, endsAtString, free);
})
.subscribe(/* */);

或

listRoomsCall
.flatMap(v -> 
     Observable.fromIterable(v.getExchangeRoomList())
     .flatMap(exchangeRoom -> {
         mMeetingServiceApi.listMeetings(roomID, startsAtString, endsAtString, free);
     })
)
.subscribe(/* */);