注释掉一下就好了
当直接传json字符串时,不需要下面这句话

params.setMultipart(true);
RequestParams params = new RequestParams(Constant.appPlatformShoppingCartAdd);
params.addHeader("Authorization", Constant.authorization);
params.addHeader("language", Constant.system_language);
// params.setMultipart(true);
// params.setAsJsonContent(true);

params.addBodyParameter("", shopDetailShopBeanString);

当传集合时,必须params.setAsJsonContent(true);

RequestParams params = new RequestParams(Constant.submitShopCar);
params.addHeader("Authorization", Constant.authorization);
params.addHeader("language", Constant.system_language);
params.setAsJsonContent(true);
// params.addBodyParameter("", "{\"shoppingCartVos\":" + submitRequirBeanString + "}");
params.addBodyParameter("shoppingCartVos", recordSelect);

xutils3报错:Unsupported Media Type_json