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效果图：

实现代码：

/**
 * Author : wangning
 * Email : maoning20080809@163.com
 * Date : 2022/8/11 12:16
 * Description : 搜索好友
 */

Color themeDef = Color(0xffEDEDED);

class SearchFriends extends StatelessWidget {
  const SearchFriends({super.key});

  @override
  Widget build(BuildContext context) {
    return const SearchFriendsPage(title: '搜索好友');
  }
}

class SearchFriendsPage extends StatefulWidget {
  const SearchFriendsPage({super.key, required this.title});

  final String title;

  @override
  State<SearchFriendsPage> createState() => _SearchFriendsState();
}

class _SearchFriendsState extends State<SearchFriendsPage> {

  //搜索提示框
  bool hideSearch = true;
  //搜索结果
  bool hideSearchResult = true;

  //从服务器搜索好友
  void _getUserLikeAccount(String searchAccount) async {

    bool isNetwork = await CommonNetwork.isNetwork();
    if(!isNetwork) {
      CommonUtils.showNetworkError(context);
      return;
    }

    if(searchAccount.isEmpty){
      return;
    }
    String account = "";
    List<UserBean> userlist = await UserRepository.getInstance().getUserLikeAccount(account, searchAccount);
    if(userlist.isEmpty){
      hideSearchResult = false;
    }
    setState(() {
      _userlist = userlist;
    });
  }

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

  String results = "";//原来的内容是空的
  final TextEditingController controller = TextEditingController(text: "");
  ScrollController _controller = ScrollController();
  List<UserBean> _userlist = [];

  @override
  Widget build(BuildContext context) {

    return Scaffold(
      appBar: WnAppBar.getAppBar(context, Text("${widget.title}")),

      body: Column(
        children: [
          _getEnterAccountWidget(),
          _getSearchWidget(),
          Offstage(
            offstage: hideSearchResult,
            child: _noDataWidget(),
          ),

          Expanded(
              child: ListView.builder(
                controller: _controller,
                itemBuilder: (BuildContext context, int index) {
                  return ChatContentView(userBean: _userlist[index]);
                },
                itemCount: _userlist.length,
              )
          ),

        ],
      ),
    );
  }

  //没有好友提示
  Widget _noDataWidget() {
    return Center(
      child: Padding(
        padding: EdgeInsets.all(10.0),
        child: Row(
          mainAxisAlignment: MainAxisAlignment.center,
          crossAxisAlignment: CrossAxisAlignment.center,
          children: <Widget>[
            Text('搜索结果为空...',style: TextStyle(fontSize: 16.0),)
          ],
        ),
      ),
    );
  }

  //账号输入框
  Widget _getEnterAccountWidget(){
    return Container(
      height: 60,
      padding: const EdgeInsets.only(left: 20.0, top: 10, right: 10, bottom: 10),//上下左右都设置边距
      child: Row(
        children: [

            Expanded(
              child: Container(
                margin: EdgeInsets.only(right: 20),
                padding: EdgeInsets.only(left: 10, top:10, right: 10),
                height: 60,
                decoration: BoxDecoration(borderRadius: BorderRadius.all(Radius.circular(5.0),),color: Colors.white),
                child: TextField(
                  controller: controller,
                  //decoration: InputDecoration.collapsed(hintText: "账号/手机号"),
                  decoration: InputDecoration(hintText: "账号/手机号", counterText: "", border: InputBorder.none),
                  autocorrect: true,
                  //是否自动更正
                  autofocus: false,
                  maxLines: 1,
                  minLines: 1,
                  maxLength: 20,
                  textAlign: TextAlign.start,
                  style: TextStyle(color: Colors.black),
                  cursorColor: Colors.green,
                  onTap: (){
                  },
                  onChanged: (value){
                    //LogUtils.d("录入的值：${value}");
                    String content = controller.text;
                    if(content.length > 0){
                      hideSearch = false;
                    } else {
                      hideSearch = true;
                    }
                    hideSearchResult = true;
                    setState(() {
                    });
                  },
                  //onSubmitted: _handleSubmitted,
                  enabled: true, //是否禁用
                ),
              ),
          ),

          MaterialButton(
            color: Colors.blue,
            textColor: Colors.white,
            child: Text("取消"),
            onPressed: (){
              Navigator.pop(context);
            },
          ),
        ],
      ),
    );

  }

  //点击搜索按钮
  Widget _getSearchWidget(){
    return InkWell(
      
      onTap: (){
        _getUserLikeAccount(controller.text);
      },

      child: Offstage(
        offstage: hideSearch,
        child: Container(
          height: 70,
          width: double.infinity,
          padding: const EdgeInsets.only(left: 12.0, top: 10, right: 20,bottom: 10),//上下左右都设置边距
          child: Row(
              children: [
                Image.asset(CommonUtils.getBaseIconUrlPng("main_contacts_icon"), width: 50, height: 50,),
                SizedBox(width: 10,),
                Text("搜索："),
                Expanded(child: Text("${controller.text}"))
              ],
          ),
        ),
      ),
    );
  }
}

class ChatContentView extends StatefulWidget {

  final UserBean userBean;

  ChatContentView({required this.userBean});

  @override
  State<ChatContentView> createState() => _ChatContentViewState();

}


class _ChatContentViewState extends State<ChatContentView> {

  String account = SpUtils.getString(CommonUtils.LOGIN_ACCOUNT);
  @override
  void initState() {
    super.initState();
  }

  void _clickDetails(String searchAcccount) async{
    ContactsBean? contactsBean = await ContactsRepository.getInstance().findContactByFromOrToAccount(account, searchAcccount);
    if(contactsBean != null && contactsBean.type == ContactsBean.typeReceive){
     //好友直接跳转到聊天页面
      Navigator.popUntil(context, (route) {return route.isFirst;});
      await Navigator.push(context, MaterialPageRoute(builder: (c) {return HomeChatPage(toChatId: searchAcccount);}));
    } else {
      Navigator.pop(context);
      Navigator.push(context,MaterialPageRoute(builder: (context)=>AddFriends(userBean: widget.userBean,)));
    }
  }

  @override
  Widget build(BuildContext context) {

    return InkWell(
      onTap: (){
        _clickDetails(widget.userBean.account??"");
      },
      child: Container(
        //decoration: BoxDecoration(color: Colors.white70),
        decoration: BoxDecoration(color: Colors.white70, border: Border(bottom:BorderSide(color: Color(0xffd9d9d9), width: 0.3))),
        //margin: EdgeInsets.only(top: 8.0, bottom: 8),
        padding: EdgeInsets.all(16.0),
        child: Row(
          children: <Widget>[
            Expanded(
              child: Stack(
                alignment: AlignmentDirectional.centerStart,
                children: [
                  Text("账号：${widget.userBean.account}   昵称：${widget.userBean.nickName}",style: TextStyle(fontSize: 18),),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }
}