单例封装retrofit+拦截器

public class RightRetroFactory {    private static OkHttpClient httpClient = new OkHttpClient.Builder()            .addInterceptor(new LoggingInterceptor()).connectTimeout(30, TimeUnit.SECONDS)            .readTimeout(30, TimeUnit.SECONDS)            .build();    private static ApiServer retrofitService = new Retrofit.Builder()            .baseUrl(Api.LEFT_PATH)            .addConverterFactory(GsonConverterFactory.create())            .addCallAdapterFactory(RxJavaCallAdapterFactory.create())            .client(httpClient)            .build()            .create(ApiServer.class);    //单列模式    public static ApiServer getInstance() {        return retrofitService;    }}