我使用OkHttp3、Retrofit 2.0 + RxObservable请求一个JSON文件时，会抛出“接口未实现”的错误。这似乎只会在运行较旧版本我们应用的Android 4.3用户升级到最新版本后出现。
01-19 16:43:31.089 1611-1692/? E/AndroidRuntime: FATAL EXCEPTION: IntentService[MyDataIntentService]
java.lang.IncompatibleClassChangeError: interface not implemented
at okhttp3.internal.Util.closeQuietly(Util.java:100)
at okhttp3.internal.connection.StreamAllocation.streamFailed(StreamAllocation.java:332)
at okhttp3.internal.http.RetryAndFollowUpInterceptor.recover(RetryAndFollowUpInterceptor.java:209)
at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:132)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)
at okhttp3.logging.HttpLoggingInterceptor.intercept(HttpLoggingInterceptor.java:212)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:92)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:67)
at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:179)
at okhttp3.RealCall.execute(RealCall.java:63)
at retrofit2.OkHttpCall.execute(OkHttpCall.java:174)
at retrofit2.adapter.rxjava.RxJavaCallAdapterFactory$CallOnSubscribe.call(RxJavaCallAdapterFactory.java:144)
at retrofit2.adapter.rxjava.RxJavaCallAdapterFactory$CallOnSubscribe.call(RxJavaCallAdapterFactory.java:125)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:50)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:50)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
at rx.Observable.subscribe(Observable.java:8759)
at rx.Observable.subscribe(Observable.java:8726)
at rx.Observable.subscribe(Observable.java:8581)
at com.somepackage.someclass.loadSomeJSONThing(MyFile.kt:61)
这是调用：
//get returns Observable<Any>
myApi.getSomeObj("some_id")
.subscribe({ responseHandler(it) },
{ Crashlytics.logException(it) })