Pét*_*űcs 11 java error-handling android rx-java retrofit
我正在使用较新的RX java而不是
Observable.create(new Observable.OnSubscribeFunc<T>() {...});
使用:(由于弃用)
Observable.create(new Observable.OnSubscribe<T>() {...});
(这可能很重要,因为大多数示例,教程,explonation使用旧的......)
好吧,让我们看看我的问题.我有一个Java类,相关部分来自它:
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);
}
如果一切正常,这段代码几乎可以完美运行.但是,如果我发出故意错误,就像我关闭WiFi ..比改装得到"UnKnownHostException" ......因为它应该发生在try catch块中的改装调用(getUser).但是不是将错误处理到onError(Throwable t) - >我可以处理的地方,它只是崩溃应用程序.所以就好像错误永远不会到达catch块.有什么奇怪的是,错误(如404,401等)被捕获,由onError(...)得到,一切都很好.
在崩溃之前一切都进行了3次,从.retry(3)开始,但没有一个进入catch子句.
编辑1
LogCat输出:
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$1.run(Platform.java:142)
at java.lang.Thread.run(Thread.java:841)
01-08 16:19:31.606 15285-16162/asd.bdef.gh D/Retrofit? ---- END ERROR
01-08 16:19:31.977 15285-15285/asd.bdef.gh D/AndroidRuntime? Shutting down VM
01-08 16:19:31.977 15285-15285/asd.bdef.gh W/dalvikvm? threadid=1: thread exiting with uncaught exception (group=0x41c9d8b0)
01-08 16:19:31.977 15285-15285/asd.bdef.gh E/AndroidRuntime? FATAL EXCEPTION: main
给定的api地址不是真实的,但真实的地址是可达的.我刚关闭WiFi以测试错误处理.
还有一个用例:如果我添加到observable .onExceptionResumeNext([2nd observable])而不是第二个observable,它就不会崩溃.但这不是问题的解决方案.
编辑2
ApiManager.login(userName, pass, new Observer<User>() {
@Override
public void onCompleted() { }
@Override
public void onError(Throwable e) {
DialogManager.showBasicErrorDialog(getApplicationContext(), e.getLocalizedMessage());
logger.showLog("Login Not ok");
e.printStackTrace();
}
@Override
public void onNext(User user) {
logger.showLog("login ok, user: " + user.getName().toString());
{...}
}
});
编辑3
FATAL EXCEPTION: main
rx.exceptions.OnErrorFailedException: Error occurred when trying to propagate error to Observer.onError
at rx.observers.SafeSubscriber._onError(SafeSubscriber.java:175)
at rx.observers.SafeSubscriber.onError(SafeSubscriber.java:97)
at rx.internal.operators.NotificationLite.accept(NotificationLite.java:144)
{...}
Caused by: java.lang.NullPointerException: Attempt to read from field 'rx.functions.Action0 rx.schedulers.TrampolineScheduler$TimedAction.action' on a null object reference
at rx.schedulers.TrampolineScheduler$InnerCurrentThreadScheduler.enqueue(TrampolineScheduler.java:85)
在此先感谢您的帮助.