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效果图：

实现代码：

//修改群名
void _updateGroupName(){
  bool isOwner = false;
  for(int i = 0; i< _groupUserList.length; i++){
    GroupUserBean groupUserBean = _groupUserList[i];
    if(account == groupUserBean.account &&
        (groupUserBean.accountType == GroupUserBean.ACCOUNT_TYPE_OWNER||
            groupUserBean.accountType == GroupUserBean.ACCOUNT_TYPE_ADMIN)){
      isOwner = true;
      break;
    }
  }
  if(isOwner){
    Navigator.push(context, MaterialPageRoute(builder: (context) => GroupUpdateName(groupId: widget.groupId)));
  } else {
    LoadingDialogUtils.showTipDialog(context, msg : "当前群聊仅群主/群管理员可以修改群聊名称");
  }

}

/**
 * Author : wangning
 * Email : maoning20080809@163.com
 * Date : 2022/11/15 14:13
 * Description : 修改群名
 */

class GroupUpdateName extends StatefulWidget {

  String groupId;

  GroupUpdateName({required this.groupId});

  @override
  _GroupUpdateNameState createState() => _GroupUpdateNameState();

}

class _GroupUpdateNameState extends State<GroupUpdateName> {

  TextEditingController? _groupNameController;

  //修改群名
  void _processUpdateName(String groupName) async {
    bool isNetwork = await CommonNetwork.isNetwork();
    if(!isNetwork) {
      CommonUtils.showNetworkError(context);
      return;
    }

    if(_groupBean!= null){
      _groupBean?.groupName = groupName;
      bool isSuccess = await GroupRepository.getInstance().updateGroupServer(_groupBean!);
      if(isSuccess){
        CommonToast.show(context, "修改成功！");
        GroupRepository.getInstance().updateGroup(_groupBean!);
        eventBus.emit(BaseEvent(BaseEvent.TYPE_REFRESH_GROUP, result: HashMap<String, Object>()));
        Navigator.pop(context);
      } else {
        CommonToast.show(context, "修改失败！");
      }
    }

  }


  GroupBean? _groupBean;

  //初始化群名
  void _initGroup() async{
    _groupBean = await GroupRepository.getInstance().findGroupByGroupId(widget.groupId);
    _groupNameController = TextEditingController(text: "${_groupBean?.groupName}");
    setState(() {
    });

  }

  @override
  void initState() {
    super.initState();
    _initGroup();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: WnAppBar.getAppBar(context, Text("修改群名")),
      body: Container(
        height: 200,
        child: Column(
          children: [
            SizedBox(height: 30,),
            Expanded(
                child: Container(
                  margin: EdgeInsets.only(left: 12, right: 12),
                  width: double.infinity,
                  child: Row(
                    children: [
                      Text("群名："),
                      Expanded(
                        child:customTextField(defaultValue: '${_groupBean?.groupName}',textEditController: _groupNameController,),
                      ),
                    ],
                  ),
                )
            ),
            SizedBox(height: 30,),
            Container(
              alignment: AlignmentDirectional.center,
              child: _updateNameWidget(),
            ),

          ],
        ),
      ),
    );
  }

  Widget customTextField({
    TextEditingController? textEditController,
    String? hintText,
    String? defaultValue,
  }) {
    return TextField(
      controller: textEditController,
      cursorColor: Colors.black,
      decoration: InputDecoration(
        //labelText: defaultValue,
        //hintText: hintText,
        hintStyle: TextStyle(
          fontSize: 16,
          color: Colors.grey.withOpacity(0.8),
        ),
        focusedBorder: OutlineInputBorder(
          borderSide: const BorderSide(color: Colors.black),
          borderRadius: BorderRadius.circular(5.0),
        ),
        enabledBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(5.0),
          borderSide: BorderSide(
            color: Colors.grey,
          ),
        ),
      ),
      style: TextStyle(
        fontSize: 16,
        color: Colors.black,
        fontWeight: FontWeight.w500,
      ),
    );
  }

  Widget _updateNameWidget() {
    return MaterialButton(
      color: Colors.blue,
      textColor: Colors.white,
      padding: EdgeInsets.only(left: 28, top: 8, right: 28, bottom: 8),
      child: Text('修改', style: TextStyle(fontSize: 16),),
      onPressed: () {
        var nickName = _groupNameController?.text??"";
        _processUpdateName(nickName);
      },
    );
  }
}