异步 RxJava 订阅仍然抛出 NetworkOnMainThreadException

Question

因此，在查看此处解决相同问题的其他答案后，看起来这些解决方案并不奏效。这是我得到的错误。我在newThread() 上有我的RxJava 实现，在mainThread() 上有观察者。

所以我的第一个 observable 是发射一个 Observable>。我正在使用flatMapObservable 遍历它，并使用每个整数来获取单个新闻项作为 Observable。

查看我的 Http 日志，我得到了整数列表和第一个新闻项目。然后我得到一个错误。

任何帮助将不胜感激。

mMainProvider.getNewestHackerStories()
            .subscribeOn(Schedulers.newThread())
            .observeOn(AndroidSchedulers.mainThread())
            .doOnError(Throwable::printStackTrace)
            .flatMapIterable(ids -> ids)
            .flatMap(id -> mMainProvider.getHackerNewsItem(id))
            .subscribe(hackerNewsItem -> newStoryList.add(hackerNewsItem));

17-12017/com.androidtitan.magicmirror W/System.err: android.os.NetworkOnMainThreadException
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1273)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at com.android.org.conscrypt.OpenSSLSocketImpl.shutdownAndFreeSslNative(OpenSSLSocketImpl.java:1237)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at com.android.org.conscrypt.OpenSSLSocketImpl.close(OpenSSLSocketImpl.java:1232)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at okhttp3.internal.Util.closeQuietly(Util.java:105)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at okhttp3.internal.http.StreamAllocation.deallocate(StreamAllocation.java:259)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at okhttp3.internal.http.StreamAllocation.streamFailed(StreamAllocation.java:306)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at okhttp3.internal.http.HttpEngine.close(HttpEngine.java:478)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at okhttp3.RealCall.getResponse(RealCall.java:273)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at okhttp3.RealCall$ApplicationInterceptorChain.proceed(RealCall.java:201)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at okhttp3.logging.HttpLoggingInterceptor.intercept(HttpLoggingInterceptor.java:212)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at okhttp3.RealCall$ApplicationInterceptorChain.proceed(RealCall.java:190)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:163)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at okhttp3.RealCall.execute(RealCall.java:57)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at retrofit2.OkHttpCall.execute(OkHttpCall.java:174)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at retrofit2.adapter.rxjava.RxJavaCallAdapterFactory$RequestArbiter.request(RxJavaCallAdapterFactory.java:171)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at rx.Subscriber.setProducer(Subscriber.java:211)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at rx.Subscriber.setProducer(Subscriber.java:205)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at retrofit2.adapter.rxjava.RxJavaCallAdapterFactory$CallOnSubscribe.call(RxJavaCallAdapterFactory.java:152)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at retrofit2.adapter.rxjava.RxJavaCallAdapterFactory$CallOnSubscribe.call(RxJavaCallAdapterFactory.java:138)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:50)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at rx.Observable.unsafeSubscribe(Observable.java:8666)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at rx.internal.operators.OperatorMerge$MergeSubscriber.onNext(OperatorMerge.java:250)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at rx.internal.operators.OperatorMerge$MergeSubscriber.onNext(OperatorMerge.java:147)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at rx.internal.operators.OperatorMap$MapSubscriber.onNext(OperatorMap.java:74)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at rx.internal.operators.OnSubscribeFlattenIterable$FlattenIterableSubscriber.drain(OnSubscribeFlattenIterable.java:239)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at rx.internal.operators.OnSubscribeFlattenIterable$FlattenIterableSubscriber.onNext(OnSubscribeFlattenIterable.java:130)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.call(OperatorObserveOn.java:227)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at rx.android.schedulers.LooperScheduler$ScheduledAction.run(LooperScheduler.java:107)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at android.os.Handler.handleCallback(Handler.java:739)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:95)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at android.os.Looper.loop(Looper.java:158)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:7224)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
08-04 21:27:16.766 12017-12017/com.androidtitan.magicmirror W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

Answer 1

observeOn(AndroidSchedulers.mainThread()) 之后的所有内容都将在主线程上运行。我想mMainProvider.getHackerNewsItem 是网络调用，所以你应该将observeOn 行移到subscribe 之前。