android - UndeliverableException 与 rxJava2 和改造

Question

我的应用程序在 Crashlytics(Fabric) 上反复出现异常。我使用带有改造的 rxjava2 来进行我的 http 调用。

这就是 crashlytics 日志中的所有内容(如下)。将不胜感激任何帮助/见解。

Fatal Exception: io.reactivex.exceptions.UndeliverableException: retrofit2.adapter.rxjava2.HttpException: HTTP 404 
   at io.reactivex.plugins.RxJavaPlugins.onError(RxJavaPlugins.java:349)
   at io.reactivex.internal.operators.single.SingleZipArray$ZipCoordinator.innerError(SingleZipArray.java:141)
   at io.reactivex.internal.operators.single.SingleZipArray$ZipSingleObserver.onError(SingleZipArray.java:177)
   at io.reactivex.internal.operators.single.SingleDoOnError$DoOnError.onError(SingleDoOnError.java:63)
   at io.reactivex.internal.operators.single.SingleDoOnSuccess$DoOnSuccess.onError(SingleDoOnSuccess.java:64)
   at io.reactivex.internal.operators.single.SingleSubscribeOn$SubscribeOnObserver.onError(SingleSubscribeOn.java:73)
   at io.reactivex.internal.operators.observable.ObservableSingleSingle$SingleElementObserver.onError(ObservableSingleSingle.java:95)
   at retrofit2.adapter.rxjava2.BodyObservable$BodyObserver.onNext(BodyObservable.java:56)
   at retrofit2.adapter.rxjava2.BodyObservable$BodyObserver.onNext(BodyObservable.java:37)
   at retrofit2.adapter.rxjava2.CallExecuteObservable.subscribeActual(CallExecuteObservable.java:43)
   at io.reactivex.Observable.subscribe(Observable.java:10842)
   at retrofit2.adapter.rxjava2.BodyObservable.subscribeActual(BodyObservable.java:34)
   at io.reactivex.Observable.subscribe(Observable.java:10842)
   at io.reactivex.internal.operators.observable.ObservableSingleSingle.subscribeActual(ObservableSingleSingle.java:35)
   at io.reactivex.Single.subscribe(Single.java:2703)
   at io.reactivex.internal.operators.single.SingleSubscribeOn$SubscribeOnObserver.run(SingleSubscribeOn.java:89)
   at io.reactivex.Scheduler$DisposeTask.run(Scheduler.java:452)
   at io.reactivex.internal.schedulers.ScheduledRunnable.run(ScheduledRunnable.java:61)
   at io.reactivex.internal.schedulers.ScheduledRunnable.call(ScheduledRunnable.java:52)
   at java.util.concurrent.FutureTask.run(FutureTask.java:237)
   at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:152)
   at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:265)
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
   at java.lang.Thread.run(Thread.java:818)
Caused by retrofit2.adapter.rxjava2.HttpException: HTTP 404 
   at retrofit2.adapter.rxjava2.BodyObservable$BodyObserver.onNext(BodyObservable.java:54)
   at retrofit2.adapter.rxjava2.BodyObservable$BodyObserver.onNext(BodyObservable.java:37)
   at retrofit2.adapter.rxjava2.CallExecuteObservable.subscribeActual(CallExecuteObservable.java:43)
   at io.reactivex.Observable.subscribe(Observable.java:10842)
   at retrofit2.adapter.rxjava2.BodyObservable.subscribeActual(BodyObservable.java:34)
   at io.reactivex.Observable.subscribe(Observable.java:10842)
   at io.reactivex.internal.operators.observable.ObservableSingleSingle.subscribeActual(ObservableSingleSingle.java:35)
   at io.reactivex.Single.subscribe(Single.java:2703)
   at io.reactivex.internal.operators.single.SingleSubscribeOn$SubscribeOnObserver.run(SingleSubscribeOn.java:89)
   at io.reactivex.Scheduler$DisposeTask.run(Scheduler.java:452)
   at io.reactivex.internal.schedulers.ScheduledRunnable.run(ScheduledRunnable.java:61)
   at io.reactivex.internal.schedulers.ScheduledRunnable.call(ScheduledRunnable.java:52)
   at java.util.concurrent.FutureTask.run(FutureTask.java:237)
   at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:152)
   at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:265)
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
   at java.lang.Thread.run(Thread.java:818)

Answer 1

如果你没有给订阅者或观察者一个可抛出的 lambda .. Rxjava 没有办法捕捉到这些异常。所以简单的解决方案是每当订阅 Observable 或其他 Rxjava 类型时覆盖 onError() 方法并根据情况处理它们。

compositeDisposable.add(Observable.just("start")
        .doOnNext(ignored -> loadingIndicator.onNext(true))
        .flatMap(ignored -> repository.getAndroidDev())
        .subscribe(posts::onNext, throwable -> Timber.e(throwable))); //second lambda is the solution, at lease you can log the errors, if you're not willing to handle them