Retrofit - android.os.NetworkOnMainThreadException with RxKotlin

Question

I've created rx function to call a network call from view-model in android, it parses network on main thread function.

I just change few line of code it worked. but i need to know the reason for this because its use same builder pattern to create a rx-call. once I tried with changing .doOnSubscribe() ,doOnComplete () , .applySchedulers() after the flatmap call it worked? how is this happened?

fun loadjobs(var countryID:String){
subscription.add(
repository.getMainJobsFromLocal(countryID)
          .doOnSubscribe { postProgress(StatusModel(Status.IN_PROGRESS))}
          .doOnComplete { postProgress(StatusModel(Status.COMPLETED)) }
          .applySchedulers()
          .flatMap {
           if (it.isNullOrEmpty()) {
              repository.getMainJobsFromServer(countryID)
           } else {
              Flowable.just(Response.success(it))
           }
          }
          .subscribe({
            if (it.isResponseOk()) {
             postProgress(StatusModel(Status.SUCCESS))
             mainJobResponse.postValue(it.body())
           } else {
             postProgress(StatusModel(Status.FAILED))
             mainJobResponse.postValue(null)
           }
          }, {
           postProgress(StatusModel(Status.FAILED))
           mainJobResponse.postValue(null)
        }))
}


fun loadjobs(var countryID){
subscription.add(
repository.getMainJobsFromLocal(countryID)
          .flatMap {
           if (it.isNullOrEmpty()) {
             repository.getMainJobsFromServer(countryID).flatMap {
               Flowable.just(it)
             }
           } else {
             Flowable.just(Response.success(it))
           }
          }.doOnSubscribe { postProgress(StatusModel(Status.IN_PROGRESS)) }
            .doOnComplete { postProgress(StatusModel(Status.COMPLETED)) }
            .applySchedulers()
            .subscribe({
              if (it.isResponseOk()) {
                postProgress(StatusModel(Status.SUCCESS))
                mainJobResponse.postValue(it.body())
               } else {
               postProgress(StatusModel(Status.FAILED))
               mainJobResponse.postValue(null)
              }
           }, {
            postProgress(StatusModel(Status.FAILED))
            mainJobResponse.postValue(null)
    }))
}

The `applyScheduler()` is not going to make the whole observable streams to go async. Every time you invoke a network request you should chain it with this function. — Mahdi-Malv, Nov 11 '19 at 06:03
Tell me which of these functions are supposed to be async in another thread? — Mahdi-Malv, Nov 11 '19 at 06:04

score 1 · Accepted Answer · answered Nov 11 '19 at 06:08

applySchedulers() after the flatmap call it worked? how is this happened?

observeOn() affects everything downstream. If you have a flatMap() after observeOn(), it gets executed on that scheduler.

Similarly subscribeOn() affects the upstream chain.

For these reasons, for most use cases you'd want to have the schedulers applied at the end of your rx chain and not in the middle.

score 0 · Answer 2 · answered Nov 11 '19 at 05:28

0

Add subscribeOn(Schedulers.io()) and observeOn(AndroidSchedulers.mainThread()) to your Observable.

answered Nov 11 '19 at 05:28

Saurabh Thorat

18,131
5
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this two are sets with the .applySchedulers() its a extention function. fun Flowable.applySchedulers(): Flowable { return subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread()) } – Prabudda Fernando Nov 11 '19 at 05:59

Retrofit - android.os.NetworkOnMainThreadException with RxKotlin

2 Answers2