docs: private void refresh() {
          mDataList = new ArrayList<>();
          for (int i = 0; i < 100; i++) {
              Group group = new Group();
              group.setName("我是爸爸，我的号是 " + i);
              group.setMemberList(new ArrayList<GroupMember>());
              for (int j = 0; j < 10; j++) {
                  GroupMember member = new GroupMember();
                  member.setName("我是儿子，我的号是 " + j);
                  group.getMemberList().add(member);
              }
              mDataList.add(group);
          }
  
          mAdapter.setGroupList(mDataList);
          mAdapter.notifyDataSetChanged();
      }