public class RetrofitHelper {    private static OkHttpClient okHttpClient;  private static ServiceAPI serviceAPI;    private static ServiceAPI api;    static {        initOkhttpClient();    }    private static OkHttpClient initOkhttpClient() {        if (okHttpClient==null){            synchronized (RetrofitHelper.class){                if (okHttpClient==null){                    okHttpClient=new OkHttpClient.Builder()                            .build();                }            }        }        return okHttpClient;    }public static  ServiceAPI getAPI(){if (serviceAPI==null){    synchronized (ServiceAPI.class){        if (serviceAPI==null){          api = RetrofitHelper.createAPI(ServiceAPI.class,Api.URl);        }    }}    return  api;}    /**     *     * @param clzz     * @param url     * @param 
     
           * @return     */    public static  
      
        T createAPI(Class
       
         clzz,String url){        Retrofit retrofit=new Retrofit.Builder()                .baseUrl(url)                .addConverterFactory(GsonConverterFactory.create())                .addCallAdapterFactory(RxJava2CallAdapterFactory.create())                .build();        return  retrofit.create(clzz);    }}
       
      
     

public interface ServiceAPI {    //首页    @GET(Api.HOME)    Observable
     
       home();//分类    @GET(Api.CLASSIFY)    Observable
      
       classify();    //分类子列表    @GET(Api.CLASSIFY2)    Observable
       
        classify2(@Query("cid")String cid);    @GET(Api.PRODUCTLIST)    Observable
        
         productlist(@Query("pscid")String pscid);    //详情    @GET(Api.PARTICULARS)    Observable
         
          particulars(@Query("pid")String pid,@Query("suorce")String suorce);    //添加购物车    @GET(Api.ADDCART)    Observable
          
           addcart(@QueryMap Map
           
            map); //登录 @GET(Api.LOGIN) Observable
            
             login(@Query("mobile")String name,@Query("password")String pass); //注册 @GET(Api.REGISTER) Observable
             
              register(@Query("mobile")String name,@Query("password")String pass); //订单列表 @GET(Api.ORDERSLIST) Observable
              
               indentlist(@QueryMap Map
               
                map);}