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()
    }
}

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();

                // Log.e("jjj", "=" + (MySharedPreference.getmInstance().isEnglish() ? Constant.WEB_SERVICE : Constant.WEB_SERVICE_ARABIC));
                retrofit = new Retrofit.Builder()
                        .client(okHttpClient)
                        .baseUrl(Constants.WEB_SERVICE)
                        .addConverterFactory(GsonConverterFactory.create(gson))
                        .build();
            }
            return retrofit;
        }`enter code here`

    }

    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);
    }
}


-------------------------------------------------------------------------


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

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

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()))

public class ApiModule {
    public WebService apiService(Context context) {
        String mBaseUrl = context.getString(BuildConfig.DEBUG ? R.string.local_url : R.string.live_url);

        HttpLoggingInterceptor loggingInterceptor = new HttpLoggingInterceptor();
        loggingInterceptor.setLevel(BuildConfig.DEBUG ? HttpLoggingInterceptor.Level.BODY : HttpLoggingInterceptor.Level.NONE);

        OkHttpClient okHttpClient = new OkHttpClient.Builder()
                .readTimeout(120, TimeUnit.SECONDS)
                .writeTimeout(120, TimeUnit.SECONDS)
                .connectTimeout(120, TimeUnit.SECONDS)
                .addInterceptor(loggingInterceptor)
                //.addNetworkInterceptor(networkInterceptor)
                .build();

        return new Retrofit.Builder().baseUrl(mBaseUrl)
                .client(okHttpClient)
                .addConverterFactory(GsonConverterFactory.create())
                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
                .build().create(WebService.class);

    }
}