FATAL EXCEPTION: main
E/AndroidRuntime: java.lang.AbstractMethodError: abstract method not implemented
at retrofit.RxJavaCallAdapterFactory.get(RxJavaCallAdapterFactory.java)
at retrofit.Retrofit.nextCallAdapter(Retrofit.java:189)
at retrofit.Retrofit.callAdapter(Retrofit.java:175)
at retrofit.MethodHandler.createCallAdapter(MethodHandler.java:45)
at retrofit.MethodHandler.create(MethodHandler.java:26)
at retrofit.Retrofit.loadMethodHandler(Retrofit.java:151)
at retrofit.Retrofit$1.invoke(Retrofit.java:132)
at $Proxy0.getPosts(Native Method)

在尝试使用RxJavaCallAdapterFactory进行改造时.我正在使用com.squareup.retrofit：retrofit：2.0.0-beta1和com.squareup.retrofit：adapter-rxjava：2.0.0-beta1.

这是我创建api接口的方法：

Retrofit retrofit = new Retrofit.Builder()
        .baseUrl(FORUM_SERVER_URL)
        .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
        .addConverterFactory(GsonConverterFactory.create())
        .build();

mForumApi = retrofit.create(ForumApi.class);

FORUM_SERVER_URL是
private static final String FORUM_SERVER_URL =“http://jsonplaceholder.typicode.com”;

我的界面方法是：

@GET("/posts")
public Observable<List<Post>> getPosts();

我叫它通过：

mForum.getApi()
            .getPosts()
            .subscribeOn(Schedulers.newThread())
            .observeOn(AndroidSchedulers.mainThread())
            .subscribe(new Observer<List<Post>>() {
                @Override
                public void onCompleted() {}
                @Override
                public void onError(Throwable e) {}
                @Override
                public void onNext(List<Post> posts) {
                    mView.displayPosts(posts);
                }
            });
}

getApi返回mForumApi
getPosts是错误发生的地方,它是API调用