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效果图：

实现代码：

/**
 * Author : wangning
 * Email : maoning20080809@163.com
 * Date : 2022/11/8 14:22
 * Description : 群列表
 */

class GroupMain extends StatefulWidget {

  @override
  State<StatefulWidget> createState() => _GroupMainState();

}

class _GroupMainState extends State<GroupMain>{

  var baseEvent;

  ScrollController _scrollController = ScrollController(); //listview 的控制器
  List<GroupBean> groupList = [];
  String account = SpUtils.getAccount();

  @override
  void initState() {
    super.initState();
    _getData();

    baseEvent = eventBus.on<BaseEvent>((baseBean) {
      //刷新群聊记录
      if(baseEvent != null && baseBean.type == BaseEvent.TYPE_REFRESH_GROUP){
        _getData();
      }
    });
  }

  //加载数据
  _getData() async {
    groupList = await GroupRepository.getInstance().findAllGroupByAccount(account)??[];
    setState(() {
    });
  }

  //跳转到群聊页面
  _goGroupDetails(String? groupId){
    if(groupId == null){
      return;
    }
    Navigator.pushNamed(context, Routes.group_chat_main, arguments: {
      "groupId":groupId   //参数map
    });
  }

  @override
  void dispose() {
    super.dispose();
    eventBus.off(baseEvent);
  }

  @override
  Widget build(BuildContext context) {

    return Scaffold(
      appBar: WnAppBar.getAppBar(context, Text("群列表")),

      body: Column(
        children: [

          Expanded(
              child:ListView.builder(

                  itemCount: groupList.length,
                  controller: _scrollController,
                  itemBuilder: (context, index) {
                    return InkWell(

                      onLongPress: (){
                        LogUtils.d("长按。${index}");
                      },
                      onTap: (){
                        _goGroupDetails(groupList[index].groupId);
                      },
                      child: Container(
                        decoration: BoxDecoration(border: Border(bottom:BorderSide(color: Color(0xffd9d9d9), width: 0.3))),
                        padding: EdgeInsets.only(left: 14, top: 20, bottom: 20),
                        child: Row(
                          children: [
                            CommonAvatarView.showBaseFileImage(groupList[index].avatar??"", width:44,  height:44),
                            SizedBox(width: 12,),
                            Text(groupList[index].groupName??"", maxLines: 1,style: TextStyle(fontSize: 18, color: Colors.black, fontWeight: FontWeight.bold),),
                          ],
                        ),
                      ),
                    );
                  })
          ),

          Container(
            margin: EdgeInsets.only(top: 12, bottom: 12),
            child: Text("${groupList.length}个群聊", style: TextStyle(fontSize: 20, color: Colors.grey),),
          ),

        ],
      ),
    );
  }

}