子Fragment获取父Fragment

在子Fragment操作父Fragment的思路

((FragmentRecyclerBD)FragmentAppointmentBD.this.getParentFragment()).changePageTitle(0,!TextUtils.isEmpty(curSearchContent) ? beanAppointments.size() : 0);//子类

public void changePageTitle(int index,int num){　　　　　　//父类
    if(null != tabLayoutViewPagerAdapter){
        switch(index){
            case 0:
                tabLayoutViewPagerAdapter.setPageTitle(0,(num > 0) ? "预约信息("+num+")" : "预约信息");
 break;
 case 1:
 tabLayoutViewPagerAdapter.setPageTitle(1,(num > 0) ? "收货完成("+num+")" : "收货完成");
 break;
 default:break;
 }//end of switch
 }//end of if
}