viewpager 子调父 父调子

//父调子
  Fragement_XiaoXiGuanLi fragement_xiaoXiGuanLi= (Fragement_XiaoXiGuanLi) fragmentList.get(viewPager.getCurrentItem());
fragement_xiaoXiGuanLi.updata(month);

//子调父
Activity_Customer_Service_Detils activity_customer_service_detils = (Activity_Customer_Service_Detils) getActivity();
activity_customer_service_detils.finsh();

 fragment  子调父类

((Fragment_Home) (Fragment_Recoment.this.getParentFragment())).show_or_hide_title(dy);