Retrofit2在Kotlin中返回null Unit for 204 No Content response [英] Retrofit2 return null Unit in kotlin for 204 No Content response

问题描述

我正在使用Retrofit 2.0.2通过以下界面将数据发布到服务器:

I'm using Retrofit 2.0.2 to post data to server using the interface below:

@POST("/path/to/post")
fun postData(/*args*/): Observable<Unit>

并收到服务器的成功响应.

And received success response from server.

05-09 21:20:21.770 23117 23224 D OkHttp  : --> POST https://myserver.com/api/notifications/123/markRead http/1.1
05-09 21:20:21.770 23117 23224 D OkHttp  : Content-Length: 0
05-09 21:20:21.770 23117 23224 D OkHttp  : User-Agent: MyUserAgent
05-09 21:20:21.770 23117 23224 D OkHttp  : Authorization: Bearer xxxxx
05-09 21:20:21.770 23117 23224 D OkHttp  : --> END POST (0-byte body)
05-09 21:20:22.473 23117 23224 D OkHttp  : <-- 204 No Content https://myserver.com/api/notifications/123/markRead (701ms)

但是我在下面遇到了异常，似乎在将null单元传递给onNext时进行了改造. 这是预期的行为吗?

But i got exception below, seems retrofit pass null Unit to onNext. Is this expected behaviour?

05-09 21:20:22.496 23117 23117 W System.err: java.lang.IllegalArgumentException: Parameter specified as non-null is null: method b.d.b.k.b, parameter result
05-09 21:20:22.496 23117 23117 W System.err:    at com.myandroid.notification.dialog.c$a.a(NotificationListPresenter.kt)
05-09 21:20:22.496 23117 23117 W System.err:    at com.myandroid.notification.dialog.c$a.onNext(NotificationListPresenter.kt:57)
05-09 21:20:22.496 23117 23117 W System.err:    at e.g.b.onNext(SafeSubscriber.java:139)
05-09 21:20:22.496 23117 23117 W System.err:    at e.d.a.g$2$1.onNext(OnSubscribeRedo.java:249)
05-09 21:20:22.496 23117 23117 W System.err:    at e.d.a.p$a.call(OperatorObserveOn.java:215)
05-09 21:20:22.496 23117 23117 W System.err:    at e.a.b.b$b.run(LooperScheduler.java:107)
05-09 21:20:22.496 23117 23117 W System.err:    at android.os.Handler.handleCallback(Handler.java:730)
05-09 21:20:22.504 23117 23117 W System.err:    at android.os.Handler.dispatchMessage(Handler.java:92)
05-09 21:20:22.504 23117 23117 W System.err:    at android.os.Looper.loop(Looper.java:137)
05-09 21:20:22.504 23117 23117 W System.err:    at android.app.ActivityThread.main(ActivityThread.java:5103)
05-09 21:20:22.504 23117 23117 W System.err:    at java.lang.reflect.Method.invokeNative(Native Method)
05-09 21:20:22.504 23117 23117 W System.err:    at java.lang.reflect.Method.invoke(Method.java:525)
05-09 21:20:22.504 23117 23117 W System.err:    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
05-09 21:20:22.504 23117 23117 W System.err:    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
05-09 21:20:22.504 23117 23117 W System.err:    at dalvik.system.NativeStart.main(Native Method)

谢谢.

推荐答案

传递给onNext的实例是响应的(已解析)主体.由于响应没有主体，因此为null.因此，正在传递null.

The instance passed into onNext is the (parsed) body of the response. Since the response has no body, it is null. Therefore, null is being passed.

您应该可以使用

fun postData(/*args*/): Observable<Unit?>

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