在我的项目中(我使用的是 Dagger 2、Retrofit 2 和 OkHTTP、RxAndroid)我有 2 个不同的 API 调用。从一个我收到 JSON，从另一个 - XML。我研究了this link并向我的 Retrofit.Builder() 添加了 2 个我需要的转换器:
@Provides
@Singleton
public Gson providesGson() {
return new GsonBuilder().create();
}
@Provides
@Singleton
public Retrofit providesRetrofit(@NonNull OkHttpClient okHttpClient, @NonNull Gson gson) {
return new Retrofit.Builder()
.baseUrl(ConstantsManager.BASE_URL)
.client(okHttpClient)
.addConverterFactory(SimpleXmlConverterFactory.create())
.addConverterFactory(GsonConverterFactory.create(gson))
.addCallAdapterFactory(RxJavaCallAdapterFactory.create())
.build();
}
但是，当我收到 JSON(XML 已正确转换)时，我得到以下信息:
D/OkHttp: {"date":"20.11.2016","bank":"PB","baseCurrency":980,"baseCurrencyLit":"UAH","exchangeRate":[{"baseCurrency":"UAH","currency":"AUD","saleRateNB":19.4452740,"purchaseRateNB":19.4452740},{"baseCurrency":"UAH","currency":"CAD","saleRateNB":19.4047320,"purchaseRateNB":19.4047320},{"baseCurrency":"UAH","currency":"CZK","saleRateNB":1.0322170,"purchaseRateNB":1.0322170,"saleRate":1.0800000,"purchaseRate":0.9800000},{"baseCurrency":"UAH","currency":"DKK","saleRateNB":3.7519280,"purchaseRateNB":3.7519280},{"baseCurrency":"UAH","currency":"HUF","saleRateNB":0.0902556,"purchaseRateNB":0.0902556},{"baseCurrency":"UAH","currency":"ILS","saleRateNB":6.7524710,"purchaseRateNB":6.7524710,"saleRate":7.0000000,"purchaseRate":6.3000000},{"baseCurrency":"UAH","currency":"JPY","saleRateNB":0.2384005,"purchaseRateNB":0.2384005,"saleRate":0.2500000,"purchaseRate":0.2200000},{"baseCurrency":"UAH","currency":"LVL","saleRateNB":0.2384005,"purchaseRateNB":0.2384005},{"baseCurrency":"UAH","currency":"LTL","saleRateNB":0.2384005,"purchaseRateNB":0.2384005},{"baseCurrency":"UAH","currency":"NOK","saleRateNB":3.0724120,"purchaseRateNB":3.0724120,"saleRate":3.2000000,"purchaseRate":2.9000000},{"baseCurrency":"UAH","currency":"SKK","saleRateNB":3.0724120,"purchaseRateNB":3.0724120},{"baseCurrency":"UAH","currency":"SEK","saleRateNB":2.8384710,"purchaseRateNB":2.8384710},{"baseCurrency":"UAH","currency":"CHF","saleRateNB":26.0049080,"purchaseRateNB":26.0049080,"saleRate":27.5000000,"purchaseRate":25.0000000},{"baseCurrency":"UAH","currency":"RUB","saleRateNB":0.4013400,"purchaseRateNB":0.4013400,"saleRate":0.4200000,"purchaseRate":0.4000000},{"baseCurrency":"UAH","currency":"GBP","saleRateNB":32.4460750,"purchaseRateNB":32.4460750,"saleRate":34.0000000,"purchaseRate":31.0000000},{"baseCurrency":"UAH","currency":"USD","saleRateNB":26.0534380,"purchaseRateNB":26.0534380,"saleRate":27.0000000,"purchaseRate":26.6000000},{"baseCurrency":"UAH","currency":"BYR","saleRateNB":26.0534380,"purchaseRateNB":26.0534380},{"baseCurrency":"UAH","currency":"EUR","saleRateNB":27.9214700,"purchaseRateNB":27.9214700,"saleRate":28.6000000,"purchaseRate":28.2000000},{"baseCurrency":"UAH","currency":"GEL","saleRateNB":10.5921530,"purchaseRateNB":10.5921530},{"baseCurrency":"UAH","currency":"PLZ","saleRateNB":6.2818280,"purchaseRateNB":6.2818280,"saleRate":6.6000000,"purchaseRate":5.9000000}]}
D/OkHttp: <-- END HTTP (2377-byte body)
E/DateCurrencyService: Error while loading data occurred!
java.lang.RuntimeException: org.xmlpull.v1.XmlPullParserException: Unexpected token (position:TEXT {"date":"20.11.2...@1:2378 in java.io.InputStreamReader@2ec8965)
at retrofit2.converter.simplexml.SimpleXmlResponseBodyConverter.convert(SimpleXmlResponseBodyConverter.java:44)
at retrofit2.converter.simplexml.SimpleXmlResponseBodyConverter.convert(SimpleXmlResponseBodyConverter.java:23)
at retrofit2.ServiceMethod.toResponse(ServiceMethod.java:117)
at retrofit2.OkHttpCall.parseResponse(OkHttpCall.java:211)
at retrofit2.OkHttpCall.execute(OkHttpCall.java:174)
at retrofit2.adapter.rxjava.RxJavaCallAdapterFactory$RequestArbiter.request(RxJavaCallAdapterFactory.java:171)
at rx.internal.operators.OperatorSubscribeOn$1$1$1.request(OperatorSubscribeOn.java:80)
at rx.Subscriber.setProducer(Subscriber.java:209)
at rx.Subscriber.setProducer(Subscriber.java:205)
at rx.Subscriber.setProducer(Subscriber.java:205)
at rx.internal.operators.OperatorSubscribeOn$1$1.setProducer(OperatorSubscribeOn.java:76)
at rx.Subscriber.setProducer(Subscriber.java:205)
at retrofit2.adapter.rxjava.RxJavaCallAdapterFactory$CallOnSubscribe.call(RxJavaCallAdapterFactory.java:152)
at retrofit2.adapter.rxjava.RxJavaCallAdapterFactory$CallOnSubscribe.call(RxJavaCallAdapterFactory.java:138)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:50)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
at rx.Observable.unsafeSubscribe(Observable.java:8666)
at rx.internal.operators.OperatorSubscribeOn$1.call(OperatorSubscribeOn.java:94)
at rx.internal.schedulers.CachedThreadScheduler$EventLoopWorker$1.call(CachedThreadScheduler.java:220)
at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:428)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:272)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
Caused by: org.xmlpull.v1.XmlPullParserException: Unexpected token (position:TEXT {"date":"20.11.2...@1:2378 in java.io.InputStreamReader@2ec8965)
at org.kxml2.io.KXmlParser.next(KXmlParser.java:432)
at org.kxml2.io.KXmlParser.next(KXmlParser.java:313)
at org.simpleframework.xml.stream.PullReader.read(PullReader.java:105)
at org.simpleframework.xml.stream.PullReader.next(PullReader.java:89)
at org.simpleframework.xml.stream.NodeReader.readElement(NodeReader.java:111)
at org.simpleframework.xml.stream.NodeReader.readRoot(NodeReader.java:85)
at org.simpleframework.xml.stream.NodeBuilder.read(NodeBuilder.java:84)
at org.simpleframework.xml.stream.NodeBuilder.read(NodeBuilder.java:71)
at org.simpleframework.xml.core.Persister.read(Persister.java:562)
at retrofit2.converter.simplexml.SimpleXmlResponseBodyConverter.convert(SimpleXmlResponseBodyConverter.java:36)
at retrofit2.converter.simplexml.SimpleXmlResponseBodyConverter.convert(SimpleXmlResponseBodyConverter.java:23)
at retrofit2.ServiceMethod.toResponse(ServiceMethod.java:117)
at retrofit2.OkHttpCall.parseResponse(OkHttpCall.java:211)
at retrofit2.OkHttpCall.execute(OkHttpCall.java:174)
at retrofit2.adapter.rxjava.RxJavaCallAdapterFactory$RequestArbiter.request(RxJavaCallAdapterFactory.java:171)
at rx.internal.operators.OperatorSubscribeOn$1$1$1.request(OperatorSubscribeOn.java:80)
at rx.Subscriber.setProducer(Subscriber.java:209)
at rx.Subscriber.setProducer(Subscriber.java:205)
at rx.Subscriber.setProducer(Subscriber.java:205)
at rx.internal.operators.OperatorSubscribeOn$1$1.setProducer(OperatorSubscribeOn.java:76)
at rx.Subscriber.setProducer(Subscriber.java:205)
at retrofit2.adapter.rxjava.RxJavaCallAdapterFactory$CallOnSubscribe.call(RxJavaCallAdapterFactory.java:152)
at retrofit2.adapter.rxjava.RxJavaCallAdapterFactory$CallOnSubscribe.call(RxJavaCallAdapterFactory.java:138)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:50)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
at rx.Observable.unsafeSubscribe(Observable.java:8666)
at rx.internal.operators.OperatorSubscribeOn$1.call(OperatorSubscribeOn.java:94)
at rx.internal.schedulers.CachedThreadScheduler$EventLoopWorker$1.call(CachedThreadScheduler.java:220)
at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:428)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:272)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
据我所知，简单 XML 转换器尝试转换我从第二次调用中获得的 JSON 响应(如我之前所说，来自第一次调用的 XML 响应正确转换)。我需要做的是使用适当的转换器转换每个响应(使用简单 XML 转换器的 XML 响应和使用 Gson 转换器的 JSON 响应)
如果我尝试切换添加转换器的顺序，我将在接收 XML 时遇到类似的错误(因为 Gson 转换器试图转换 XML 响应，显然):
D/OkHttp: <exchangerate><exchangerate ccy="EUR" ccy_name_ru="Евро " ccy_name_ua="Євро " ccy_name_en="Euro " base_ccy="UA" buy="27247312" unit="100.00000" date="2016.11.29" /><exchangerate ccy="RUR" ccy_name_ru="Российский рубль " ccy_name_ua="Росiйський рубль " ccy_name_en="Russian Rouble " base_ccy="UA" buy="39810" unit="10.00000" date="2016.11.29" /><exchangerate ccy="USD" ccy_name_ru="Доллар США " ccy_name_ua="Долар США " ccy_name_en="US Dollar " base_ccy="UA" buy="25724426" unit="100.00000" date="2016.11.29" /></exchangerate>
D/OkHttp: <-- END HTTP (799-byte body)
E/SyncService: Error while loading data occurred!
com.google.gson.stream.MalformedJsonException: Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 1 path $
at com.google.gson.stream.JsonReader.syntaxError(JsonReader.java:1559)
at com.google.gson.stream.JsonReader.checkLenient(JsonReader.java:1401)
at com.google.gson.stream.JsonReader.doPeek(JsonReader.java:593)
at com.google.gson.stream.JsonReader.peek(JsonReader.java:425)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:205)
at retrofit2.converter.gson.GsonResponseBodyConverter.convert(GsonResponseBodyConverter.java:37)
at retrofit2.converter.gson.GsonResponseBodyConverter.convert(GsonResponseBodyConverter.java:25)
at retrofit2.ServiceMethod.toResponse(ServiceMethod.java:117)
at retrofit2.OkHttpCall.parseResponse(OkHttpCall.java:211)
at retrofit2.OkHttpCall.execute(OkHttpCall.java:174)
at retrofit2.adapter.rxjava.RxJavaCallAdapterFactory$RequestArbiter.request(RxJavaCallAdapterFactory.java:171)
at rx.internal.operators.OperatorSubscribeOn$1$1$1.request(OperatorSubscribeOn.java:80)
at rx.Subscriber.setProducer(Subscriber.java:209)
at rx.Subscriber.setProducer(Subscriber.java:205)
at rx.Subscriber.setProducer(Subscriber.java:205)
at rx.internal.operators.OperatorSubscribeOn$1$1.setProducer(OperatorSubscribeOn.java:76)
at rx.Subscriber.setProducer(Subscriber.java:205)
at retrofit2.adapter.rxjava.RxJavaCallAdapterFactory$CallOnSubscribe.call(RxJavaCallAdapterFactory.java:152)
at retrofit2.adapter.rxjava.RxJavaCallAdapterFactory$CallOnSubscribe.call(RxJavaCallAdapterFactory.java:138)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:50)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
at rx.Observable.unsafeSubscribe(Observable.java:8666)
at rx.internal.operators.OperatorSubscribeOn$1.call(OperatorSubscribeOn.java:94)
at rx.internal.schedulers.CachedThreadScheduler$EventLoopWorker$1.call(CachedThreadScheduler.java:220)
at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:428)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:272)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:761)
我该怎么做才能使每个转换器转换适当的响应？
UPD: 正如 Marcin Jedynak 所建议的那样我做了以下事情:
1) 添加自定义转换器类:
public class RetrofitUniversalConverter extends Converter.Factory {
private final Converter.Factory xml;
private final Converter.Factory json;
@Inject
public RetrofitUniversalConverter(@NonNull Gson gson) {
xml = SimpleXmlConverterFactory.create();
json = GsonConverterFactory.create(gson);
}
@Override
public Converter<ResponseBody, ?> responseBodyConverter(Type type, Annotation[] annotations, Retrofit retrofit) {
for (Annotation annotation : annotations) {
if (annotation.getClass() == Xml.class) {
return xml.responseBodyConverter(type, annotations, retrofit);
}
if (annotation.getClass() == Json.class) {
return json.responseBodyConverter(type, annotations, retrofit);
}
}
return null;
}
}
2) 重写了我的 Retrofit 模块:
@Provides
@Singleton
public Gson providesGson() {
return new GsonBuilder().create();
}
@Provides
@Singleton
public Retrofit providesRetrofit(@NonNull OkHttpClient okHttpClient,
@NonNull RetrofitUniversalConverter converter) {
return new Retrofit.Builder()
.baseUrl(ConstantsManager.BASE_URL)
.client(okHttpClient)
.addConverterFactory(converter)
.addCallAdapterFactory(RxJavaCallAdapterFactory.create())
.build();
}
3) 然后，我在我的 API 接口(interface)中添加了注释:
public interface PrivatbankApi {
@GET @Xml
Observable<CurrentRates> loadCurrentRates(@NonNull @Url String url);
@GET("exchange_rates") @Json
Observable<DateRates> loadDateRates(@NonNull @Query("json") Boolean json, @NonNull @Query("date") String date);
}
但是我得到了异常:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.vedmedenko.exchangerates, PID: 5432
java.lang.RuntimeException: Unable to start service com.vedmedenko.exchangerates.core.services.SyncService@68cf714 with Intent { flg=0x4 cmp=com.vedmedenko.exchangerates/.core.services.SyncService (has extras) }: java.lang.IllegalArgumentException: Unable to create converter for class com.vedmedenko.exchangerates.core.rest.models.current.CurrentRates
for method PrivatbankApi.loadCurrentRates
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3343)
at android.app.ActivityThread.-wrap21(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1582)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
Caused by: java.lang.IllegalArgumentException: Unable to create converter for class com.vedmedenko.exchangerates.core.rest.models.current.CurrentRates
for method PrivatbankApi.loadCurrentRates
at retrofit2.ServiceMethod$Builder.methodError(ServiceMethod.java:720)
at retrofit2.ServiceMethod$Builder.createResponseConverter(ServiceMethod.java:706)
at retrofit2.ServiceMethod$Builder.build(ServiceMethod.java:167)
at retrofit2.Retrofit.loadServiceMethod(Retrofit.java:166)
at retrofit2.Retrofit$1.invoke(Retrofit.java:145)
at java.lang.reflect.Proxy.invoke(Proxy.java:813)
at $Proxy0.loadCurrentRates(Unknown Source)
at com.vedmedenko.exchangerates.core.DataManager.loadCurrentRates(DataManager.java:29)
at com.vedmedenko.exchangerates.core.services.SyncService.onStartCommand(SyncService.java:81)
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3326)
... 8 more
Caused by: java.lang.IllegalArgumentException: Could not locate ResponseBody converter for class com.vedmedenko.exchangerates.core.rest.models.current.CurrentRates.
Tried:
* retrofit2.BuiltInConverters
* com.vedmedenko.exchangerates.core.rest.converters.RetrofitUniversalConverter
at retrofit2.Retrofit.nextResponseBodyConverter(Retrofit.java:346)
at retrofit2.Retrofit.responseBodyConverter(Retrofit.java:308)
at retrofit2.ServiceMethod$Builder.createResponseConverter(ServiceMethod.java:704)
... 16 more
最佳答案
检查 this presentation作者 Jake Wharton，他完全解决了您描述的问题(并提供了许多其他有用的技巧)。
简而言之，他建议创建表示您预期数据格式的注释(例如，在您的情况下为 Json 和 Xml)并相应地注释您的 API 调用。然后定义自定义 ConverterFactory，根据遇到的注释委托(delegate)给 GsonConverterFactory 或 SimpleXmlConverterFactory。
但是，您需要向 Jake 的解决方案添加两件事。
首先不要忘记使用 @Retention(RetentionPolicy.RUNTIME) 注释您的注释，否则它们将不会在运行时保留:
@Retention(RetentionPolicy.RUNTIME)
public @interface Json {}
其次，您在 responseBodyConverter 方法中收到的注释实际上并不是您的注释。它们是系统为您的注释创建的代理。因此你需要替换条件:
annotation.getClass() == Json.class
annotation.getClass() == Xml.class
与:
annotation.annotationType() == Json.class
annotation.annotationType() == Xml.class
关于Android Retrofit 2 多个转换器(Gson & SimpleXML)错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/40824122/
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