Retrofit 2：没有虚方法newJsonReader（Ljava / io / Reader;）NoSuchMethodException

我在整个互联网上搜索这个错误，但是，只有一个stackoverflow条目没有答案或评论 . 我正在尝试使用Retrofit 2.这是我第一次使用它 . 这是我的依赖项：

compile 'com.squareup.retrofit2:retrofit:2.1.0'
compile 'com.squareup.retrofit2:converter-gson:2.1.0'
compile 'com.google.code.gson:gson:2.6.2'

我已经删除了任何OkHttp库，因为Retrofit已经使用它了 .

这是我的请求界面：

public interface LoginService {
    @POST(HTTPService.AUTHENTICATIO_URL)
    Call<User> login();
}

下一篇：我的服务生成器：

public class ServiceGenerator {

public static final String API_BASE_URL = HTTPService.BASE_URL;

private static OkHttpClient.Builder httpClient = new OkHttpClient.Builder();

private static Retrofit.Builder builder =
        new Retrofit.Builder()
                .baseUrl(API_BASE_URL)
                .addConverterFactory(GsonConverterFactory.create());

public static <S> S createService(Class<S> serviceClass, String username, String password, String roleId) {
    if (username != null && password != null) {
        String credentials = username+":"+password+":"+roleId;
        final String basic =
                "Basic " + Base64.encodeToString(credentials.getBytes(), Base64.NO_WRAP);
        httpClient.addInterceptor(chain -> {
            Request original = chain.request();

            Request.Builder requestBuilder = original.newBuilder()
                    .header("Authorization", basic)
                    .header("Accept", "application/json")
                    .method(original.method(), original.body());

            Request request = requestBuilder.build();
            return chain.proceed(request);
        });
    }

    OkHttpClient client = httpClient.build();
    Retrofit retrofit = builder.client(client).build();
    return retrofit.create(serviceClass);
    }
}

接下来：我提出请求的地方：

@Override
public void loadData(DataSource.LoadJsonCallback loadJsonCallback) {
    String login = mUser.getLogin();
    String password = mUser.getPassword();
    LoginService loginService =
            ServiceGenerator.createService(LoginService.class, login, password, "");
    Call<User> call = loginService.login();
    String a = call.request().url().toString();
    call.enqueue(new Callback<User>() {
        @Override
        public void onResponse(Call<User> call, Response<User> response) {
            try {
                loadJsonCallback.onTasksLoaded(response.body());
                User a = response.body();
                mUser = getDataFromJson("");
                if (mUser != null) {
                    mUser.setPassword(password);
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
        @Override
        public void onFailure(Call<User> call, Throwable t) {
            loadJsonCallback.onDataNotAvailable(t.getMessage());
        }
    });

}

所以，我得到了这个例外，我找不到任何地方：

java.lang.NoSuchMethodError: No virtual method newJsonReader(Ljava/io/Reader;)Lcom/google/gson/stream/JsonReader; in class Lcom/google/gson/Gson; or its super classes (declaration of 'com.google.gson.Gson' appears in /data/app/org.ucomplex.ucomplex-2/base.apk)

感谢您的任何帮助 .