Extracting Data via flatMap does not call subscribe

Question

I am trying to extract information from observable with flatMap but it won't call subscribe after that. When I return Observable.just(it) from flatMap subscribe is called as expected but then I am not able to get the information.

conn.setupNotification(UUID_GATT_DFU_DEVICE_FIRMWARE_UPDATE_STATUS, NotificationSetupMode.COMPAT)
                .subscribeOn(Schedulers.newThread())
                .doOnNext{
                    Timber.d("this is called")
                }
                .flatMap {
                    Timber.d("this is called")
                    //Observable.just(it) with this subscribe is called
                    it
                }
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(
                    { status ->
                        Timber.d("NOTIFY RESPONSE STATUS: @@@ $status")
                    },
                    {
                        Timber.d(it)
                    },
                    {
                        Timber.d("ON COMPLETE notify observer")
                    }
                ).also {
                    notificationDisposable.add(it)
                }

what am I doing wrong? I need to extract the observable but how when flatMap doesn't work as expected? I also tried another subscribe in onNext method but it also didn't work.

What information are you trying to get? What is the input to that `flatMap`? Why do you use `flatMap`? — akarnokd, Oct 03 '18 at 16:35
There is Observable and i need that ByteArray. Iam using flatMap to get rid of Observable. — Kebab Krabby, Oct 03 '18 at 16:48
Yes I saw that. What is the problem then? Maybe that inner `Observable` has no data to work with after the flattening. — akarnokd, Oct 03 '18 at 17:05
it has for sure because before this notification iam writing data to another charactics and this just should gave me how it end up. I have tried concatMap but i got same result. It just wont continue to next method `.doOnNext{ Timber.d("this is called") }.concatMap { it }.doOnNext{ Timber.d("aaaaaaaaa") }` "aaaaa" is never called — Kebab Krabby, Oct 03 '18 at 17:10
I think you simply don't get data. You check if `it` actually does produce items: `it.doOnNext { System.out.println("Data!") }`. — akarnokd, Oct 03 '18 at 17:33

Extracting Data via flatMap does not call subscribe

0 Answers0