对于OkHttp3用户的Retrofit1.9，这里是解决方案，

.setClient(new Ok3Client(new OkHttpClient.Builder().readTimeout(60, TimeUnit.SECONDS).build()))

我使用Retrofit 1.9来获取XML。

public class ServicioConexionRetrofitXML {

    public static final String API_BASE_URL = new GestorPreferencias().getPreferencias().getHost();
    public static final long tiempoMaximoRespuestaSegundos = 60;
    public static final long tiempoMaximoLecturaSegundos = 100;
    public static final OkHttpClient clienteOkHttp = new OkHttpClient();


    private static RestAdapter.Builder builder = new RestAdapter.Builder().
            setEndpoint(API_BASE_URL).
            setClient(new OkClient(clienteOkHttp)).setConverter(new SimpleXMLConverter());


    public static <S> S createService(Class<S> serviceClass) {
        clienteOkHttp.setConnectTimeout(tiempoMaximoRespuestaSegundos, TimeUnit.SECONDS);
        clienteOkHttp.setReadTimeout(tiempoMaximoLecturaSegundos, TimeUnit.SECONDS);
        RestAdapter adapter = builder.build();
        return adapter.create(serviceClass);
    }

}

如果你使用的是Retrofit 1.9.0和okhttp 2.6.0，添加到你的Gradle文件中。

    compile 'com.squareup.retrofit:retrofit:1.9.0'
    compile 'com.squareup.okhttp:okhttp:2.6.0'
    // Librería de retrofit para XML converter (Simple) Se excluyen grupos para que no entre
    // en conflicto.
    compile('com.squareup.retrofit:converter-simplexml:1.9.0') {
        exclude group: 'xpp3', module: 'xpp3'
        exclude group: 'stax', module: 'stax-api'
        exclude group: 'stax', module: 'stax'
    }

注意:如果你需要获取JSON，只需从上面的代码中删除。

.setConverter(new SimpleXMLConverter())

我找到了这个例子

https://github.com/square/retrofit/issues/1557

这里我们在构建API rest服务实现之前设置自定义url客户端连接客户端。

import com.google.gson.Gson
import com.google.gson.GsonBuilder
import retrofit.Endpoint
import retrofit.RestAdapter
import retrofit.client.Request
import retrofit.client.UrlConnectionClient
import retrofit.converter.GsonConverter


class ClientBuilder {

    public static <T> T buildClient(final Class<T> client, final String serviceUrl) {
        Endpoint mCustomRetrofitEndpoint = new CustomRetrofitEndpoint()


        Gson gson = new GsonBuilder().excludeFieldsWithoutExposeAnnotation().create()
        RestAdapter.Builder builder = new RestAdapter.Builder()
            .setEndpoint(mCustomRetrofitEndpoint)
            .setConverter(new GsonConverter(gson))
            .setClient(new MyUrlConnectionClient())
        RestAdapter restAdapter = builder.build()
        return restAdapter.create(client)
    }
}

 public final class MyUrlConnectionClient extends UrlConnectionClient {
        @Override
        protected HttpURLConnection openConnection(Request request) {
            HttpURLConnection connection = super.openConnection(request);
            connection.setConnectTimeout(15 * 1000);
            connection.setReadTimeout(30 * 1000);
            return connection;
        }
    }

在Kotlin中，您可以为retrofit2配置超时by

创建OkHttpClient对象(默认值为10秒)

val okHttpClient = OkHttpClient.Builder()
    .connectTimeout(30, TimeUnit.SECONDS)
    .writeTimeout(30, TimeUnit.SECONDS)
    .readTimeout(30, TimeUnit.SECONDS)
    .build()

然后将此对象添加到您的改造生成器中

val retrofit = Retrofit.Builder()
    .addConverterFactory(ScalarsConverterFactory.create())
    .client(okHttpClient)
    .baseUrl(BASE_URL)
    .build()

并从这个包中导入TimeUnit

import java.util.concurrent.TimeUnit

public class ApiClient {
    private static Retrofit retrofit = null;
    private static final Object LOCK = new Object();

    public static void clear() {
        synchronized (LOCK) {
            retrofit = null;
        }
    }

    public static Retrofit getClient() {
        synchronized (LOCK) {
            if (retrofit == null) {

                Gson gson = new GsonBuilder()
                        .setLenient()
                        .create();

                OkHttpClient okHttpClient = new OkHttpClient().newBuilder()
                        .connectTimeout(40, TimeUnit.SECONDS)
                        .readTimeout(60, TimeUnit.SECONDS)
                        .writeTimeout(60, TimeUnit.SECONDS)
                        .build();


                retrofit = new Retrofit.Builder()
                        .client(okHttpClient)
                        .baseUrl(Constants.WEB_SERVICE)
                        .addConverterFactory(GsonConverterFactory.create(gson))
                        .build();
            }
            return retrofit;
        }

    }

    public static RequestBody plain(String content) {
        return getRequestBody("text/plain", content);
    }

    public static RequestBody getRequestBody(String type, String content) {
        return RequestBody.create(MediaType.parse(type), content);
    }
}

@FormUrlEncoded
@POST("architect/project_list_Design_files")
Call<DesignListModel> getProjectDesign(
        @Field("project_id") String project_id);


@Multipart
@POST("architect/upload_design")
Call<BoqListModel> getUpLoadDesign(
        @Part("user_id") RequestBody user_id,
        @Part("request_id") RequestBody request_id,
        @Part List<MultipartBody.Part> image_file,
        @Part List<MultipartBody.Part> design_upload_doc);


private void getMyProjectList()
{

    ApiInterface apiService = ApiClient.getClient().create(ApiInterface.class);
    Call<MyProjectListModel> call = apiService.getMyProjectList("",Sorting,latitude,longitude,Search,Offset+"",Limit);
    call.enqueue(new Callback<MyProjectListModel>() {
        @Override
        public void onResponse(Call<MyProjectListModel> call, Response<MyProjectListModel> response) {
            try {
                Log.e("response",response.body()+"");

            } catch (Exception e)
            {
                Log.e("onResponse: ", e.toString());
                           }
        }
        @Override
        public void onFailure(Call<MyProjectListModel> call, Throwable t)
        {
            Log.e( "onFailure: ",t.toString());
                   }
    });
}

// file upload

private void getUpload(String path,String id)
    {

        ApiInterface apiService = ApiClient.getClient().create(ApiInterface.class);
        MultipartBody.Part GalleryImage = null;
        if (path!="")
        {
            File file = new File(path);
            RequestBody reqFile = RequestBody.create(MediaType.parse("multipart/form-data"), file);
            GalleryImage = MultipartBody.Part.createFormData("image", file.getName(), reqFile);
        }

        RequestBody UserId = RequestBody.create(MediaType.parse("text/plain"), id);
        Call<uplod_file> call = apiService.geUplodFileCall(UserId,GalleryImage);
        call.enqueue(new Callback<uplod_file>() {
            @Override
            public void onResponse(Call<uplod_file> call, Response<uplod_file> response) {
                try {
                    Log.e("response",response.body()+"");
                    Toast.makeText(getApplicationContext(),response.body().getMessage(),Toast.LENGTH_SHORT).show();

                } catch (Exception e)
                {
                    Log.e("onResponse: ", e.toString());
                }
            }
            @Override
            public void onFailure(Call<uplod_file> call, Throwable t)
            {
                Log.e( "onFailure: ",t.toString());
            }
        });
    }

    implementation 'com.squareup.retrofit2:retrofit:2.4.0'
    implementation 'com.squareup.retrofit2:converter-gson:2.4.0'

在Kotlin:

首先，您应该创建一个OkHttp客户端并添加Retrofit构建器

fun create(): Retrofit { 

        val client = OkHttpClient.Builder()
            .readTimeout(60,TimeUnit.SECONDS)
            .build()


        return Retrofit.Builder()
            .baseUrl(BASE_URL)
            .client(client)
            .addConverterFactory(GsonConverterFactory.create())
            .build()
    }
}