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;
    }
}