11
我使用的是較新的RX java的地方，而不是的Android rxJava錯誤與改造
Observable.create(new Observable.OnSubscribeFunc<T>() {...});
這是用來處理：（由於折舊）
Observable.create(new Observable.OnSubscribe<T>() {...});
（這可能是因爲最重要的例如，教程，explonation使用舊的...）
那麼，讓我看看我的問題。我有一個Java類，從它的相關部分：
private interface ApiManagerService {
@FormUrlEncoded
@POST("/login")
User getUser(@Field("username") String userName, @Field("password") String password);
}
private static RestAdapter restAdapter = new RestAdapter.Builder()
.setEndpoint(HOST)
.setLogLevel(RestAdapter.LogLevel.FULL)
.build();
private static ApiManagerService apiManager = restAdapter.create(ApiManagerService.class);
public static Subscription login(final String userName, final String password, Observer<User> observer) {
return Observable.create(new Observable.OnSubscribe<User>() {
@Override
public void call(Subscriber<? super User> subscriber) {
try {
User user = apiManager.getUser(userName, password);
subscriber.onNext(user);
subscriber.onCompleted();
} catch (RetrofitError e) {
subscriber.onError(e);
} catch (Throwable e) {
subscriber.onError(e);
}
}
}
).subscribeOn(Schedulers.io())
.retry(3)
.observeOn(AndroidSchedulers.mainThread())
.subscribe(observer);
}
這段代碼幾乎完美，如果一切正常。但是，如果我做出故意的錯誤，就像我關閉WiFi ..比翻新獲得「UnKnownHostException」 ...因爲它應該發生在try catch塊中的翻新調用（getUser）。但不是處理錯誤onError（Throwable t） - >我可以處理，它只是崩潰的應用程序。所以就好像錯誤永遠不會到達catch塊。 奇怪的是，HTTP錯誤（如404,401等）被捕獲，通過onError（...）得到，一切都很好。
崩潰前的所有事情都發生了3次，截至.retry（3），但沒有一個進入catch子句。
編輯1
logcat的輸出：
01-08 16:19:31.576 15285-16162/asd.bdef.gh D/Retrofit﹕ ---- ERROR https://testapi.com/api/login
01-08 16:19:31.606 15285-16162/asd.bdef.gh D/Retrofit﹕ java.net.UnknownHostException: Unable to resolve host "testapi.com": No address associated with hostname
at java.net.InetAddress.lookupHostByName(InetAddress.java:394)
at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
at java.net.InetAddress.getAllByName(InetAddress.java:214)
at com.squareup.okhttp.internal.Network$1.resolveInetAddresses(Network.java:29)
at com.squareup.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:259)
at com.squareup.okhttp.internal.http.RouteSelector.nextProxy(RouteSelector.java:233)
at com.squareup.okhttp.internal.http.RouteSelector.nextUnconnected(RouteSelector.java:159)
at com.squareup.okhttp.internal.http.RouteSelector.next(RouteSelector.java:133)
at com.squareup.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:314)
at com.squareup.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:237)
at com.squareup.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:423)
at com.squareup.okhttp.internal.huc.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:105)
at com.squareup.okhttp.internal.huc.HttpURLConnectionImpl.getOutputStream(HttpURLConnectionImpl.java:239)
at com.squareup.okhttp.internal.huc.DelegatingHttpsURLConnection.getOutputStream(DelegatingHttpsURLConnection.java:218)
at com.squareup.okhttp.internal.huc.HttpsURLConnectionImpl.getOutputStream(HttpsURLConnectionImpl.java:25)
at retrofit.client.UrlConnectionClient.prepareRequest(UrlConnectionClient.java:68)
at retrofit.client.UrlConnectionClient.execute(UrlConnectionClient.java:37)
at retrofit.RestAdapter$RestHandler.invokeRequest(RestAdapter.java:321)
at retrofit.RestAdapter$RestHandler.access$100(RestAdapter.java:220)
at retrofit.RestAdapter$RestHandler$1.invoke(RestAdapter.java:265)
at retrofit.RxSupport$2.run(RxSupport.java:55)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:390)
at java.util.concurrent.FutureTask.run(FutureTask.java:234)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
at retrofit.Platform$Android$2$1.run(Platform.java:142)
at java.lang.Thread.run(Thread.java:841)
01-08 16:19:31.606 15285-16162/asd.bdef.gh D/Retrofit﹕ ---- END ERROR
01-08 16:19:31.977 15285-15285/asd.bdef.gh D/AndroidRuntime﹕ Shutting down VM
01-08 16:19:31.977 15285-15285/asd.bdef.gh W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x41c9d8b0)
01-08 16:19:31.977 15285-15285/asd.bdef.gh E/AndroidRuntime﹕ FATAL EXCEPTION: main
給定的API地址不是真實的，但真正的一個可達。我剛剛關閉了WiFi以測試錯誤處理。
還有一個用例：如果我添加到observable.onExceptionResumeNext（[2nd observable]）比第二個observable，並且它不崩潰。但這不是問題的解決方案。
EDIT 2
ApiManager.login(userName, pass, new Observer<User>() {
@Override
public void onCompleted() { }
@Override
public void onError(Throwable e) {
DialogManager.showBasicErrorDialog(getApplicationContext(), e.getLocalizedMessage());
logger.showLog("Login Not ok");
e.printStackTrace();
}
@Override
public void onNext(User user) {
logger.showLog("login ok, user: " + user.getName().toString());
{...}
}
});
編輯3
FATAL EXCEPTION: main
rx.exceptions.OnErrorFailedException: Error occurred when trying to propagate error to Observer.onError
at rx.observers.SafeSubscriber._onError(SafeSubscriber.java:175)
at rx.observers.SafeSubscriber.onError(SafeSubscriber.java:97)
at rx.internal.operators.NotificationLite.accept(NotificationLite.java:144)
{...}
Caused by: java.lang.NullPointerException: Attempt to read from field 'rx.functions.Action0 rx.schedulers.TrampolineScheduler$TimedAction.action' on a null object reference
at rx.schedulers.TrampolineScheduler$InnerCurrentThreadScheduler.enqueue(TrampolineScheduler.java:85)
預先感謝幫助。
你能發表您的堆棧跟蹤/ logcat的輸出？調用代碼是什麼樣的（觀察者定義）？ –
它已被編輯..但實際上它不是太相關，因爲錯誤是故意的。 ... –
上面的輸出是_not你的應用程序crashing_ - 它是[Retrofit記錄錯誤]（https://github.com/square/retrofit/blob/2c1c6ec370f88e21ac219d8f343f1f6d904c1c87/retrofit/src/main/java/retrofit/RestAdapter.java ＃L495）。您是否啓用了logcat過濾器？... –