无法为类example.Simple创建调用适配器 [英] Unable to create call adapter for class example.Simple

问题描述

我正在使用SimpleXml改装2.0.0-beta1。我想从REST服务中检索一个简单（XML）资源。
使用SimpleXML编组/解组Simple对象可以正常工作。

I am using retrofit 2.0.0-beta1 with SimpleXml. I want the retrieve a Simple (XML) resource from a REST service. Marshalling/Unmarshalling the Simple object with SimpleXML works fine.

使用此代码时（转换后的2.0.0代码形式）：

When using this code (converted form pre 2.0.0 code):

final Retrofit rest = new Retrofit.Builder()
    .addConverterFactory(SimpleXmlConverterFactory.create())
    .baseUrl(endpoint)
    .build();
SimpleService service = rest.create(SimpleService.class);
LOG.info(service.getSimple("572642"));

服务：

public interface SimpleService {

    @GET("/simple/{id}")
    Simple getSimple(@Path("id") String id);

}

我得到这个例外：

Exception in thread "main" java.lang.IllegalArgumentException: Unable to create call adapter for class example.Simple
    for method SimpleService.getSimple
    at retrofit.Utils.methodError(Utils.java:201)
    at retrofit.MethodHandler.createCallAdapter(MethodHandler.java:51)
    at retrofit.MethodHandler.create(MethodHandler.java:30)
    at retrofit.Retrofit.loadMethodHandler(Retrofit.java:138)
    at retrofit.Retrofit$1.invoke(Retrofit.java:127)
    at com.sun.proxy.$Proxy0.getSimple(Unknown Source)

我缺少什么？我知道用 Call 包装返回类型是有效的。但我希望服务将业务对象作为类型返回（并以同步模式工作）。

What am i missing? I know that wrapping the return type by a Call works. But I want the service to return business objects as type (and working in sync mode).

更新

根据不同答案的建议添加额外的依赖项和 .addCallAdapterFactory（RxJavaCallAdapterFactory.create（））之后，我仍然会收到此错误：

After added the extra dependancies and .addCallAdapterFactory(RxJavaCallAdapterFactory.create()) as suggested by different answers, I still get this error:

Caused by: java.lang.IllegalArgumentException: Could not locate call adapter for class simple.Simple. Tried:
 * retrofit.RxJavaCallAdapterFactory
 * retrofit.DefaultCallAdapter$1

推荐答案

简答：返回 在您的服务界面中调用< Simple> 。

Short answer: return Call<Simple> in your service interface.

看起来Retrofit 2.0正试图找到一种方式为您的服务接口创建代理对象。它希望你写这个：

It looks like Retrofit 2.0 is trying to find a way of creating the proxy object for your service interface. It expects you to write this:

public interface SimpleService {
    @GET("/simple/{id}")
    Call<Simple> getSimple(@Path("id") String id);
}

然而，当你不这样做时，它仍然想玩得好想要返回致电。为了支持这一点，它具有 <$ c $的概念c> CallAdapter ，应该知道如何将 Call< Simple> 改编成 Simple 。

However, it still wants to play nice and be flexible when you don't want to return a Call. To support this, it has the concept of a CallAdapter, which is supposed to know how to adapt a Call<Simple> into a Simple.

使用 RxJavaCallAdapterFactory 仅在您尝试返回<时才有用code> rx.Observable< Simple> 。

最简单的解决方案是返回 Call 正如Retrofit预期的那样。你也可以写一个 CallAdapter .Factory 如果你真的需要它。

The simplest solution is to return a Call as Retrofit expects. You could also write a CallAdapter.Factory if you really need it.

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