我是 Flutter 的新手并进行自定义 dropdown_search 但卡在 UI 刷新上

如何解决我是 Flutter 的新手并进行自定义 dropdown_search 但卡在 UI 刷新上

我正在尝试在 Flutter 桌面窗口中开发自定义下拉搜索。我在第一次更改密钥时从服务器获取数据并刷新 ui，但在下一次更改密钥时未刷新 ui，但在退格时 ui 刷新。我正在使用 FutureBuilder 和列表视图构建器。在 onChanged 文本字段中，我在文本字段附近显示一个叠加层并调用 api。它运行良好，但在第二次或第三次键更改后，ui 没有刷新，但数据来自 api。我尝试了所有我知道的方法。 任何帮助请。这是我的代码。

import 'dart:convert';
   import 'package:http/http.dart' as http;
   import 'package:flutter/material.dart';

   import 'Widgets/globals.dart';

   class Fortest2 extends StatefulWidget {
   @override
   _Fortest2State createState() => 
   _Fortest2State();
   }

   class _Fortest2State extends State<Fortest2> {


    OverlayEntry _overlayEntry;
    final nameController = 
          TextEditingController();
    final vendorController = 
         TextEditingController();
    final FocusNode _searchFocus = FocusNode();
    final FocusNode _overlayFocus = FocusNode();
    final FocusNode _nextFocus = FocusNode();
    var isOverlayopen;
     List goods;
     var goodsId;
     var goodsName;
     var filter = '';
     Future _futureGoods;
     Future goodsList() async {
     var url = "$webApi/goods/read_filter.php? 
     query=$filter";
     var response = await 
       http.get(Uri.parse(url));
       print(Uri.parse(url));
       var goodsList = 
           json.decode(response.body);
     if (response.statusCode == 200) {
            print(goodsList);
      }

        return goodsList;
      }

      @override
      void initState() {
      isOverlayopen = 1;
      super.initState();
      }

      @override
       void dispose() {
        nameController.dispose();
        vendorController.dispose();
         super.dispose();
      }

      _fieldFocusChange(
          BuildContext context,FocusNode 
           currentFocus,FocusNode nextFocus) {
         currentFocus.unfocus();
  FocusScope.of(context).requestFocus(nextFocus);
      }

      Widget filteredList() {
        return Dialog(
           elevation: 4.0,child: FutureBuilder(
             future: goodsList(),builder: (context,snapshot) {
              if (snapshot.hasError) 
                print(snapshot.error);
          return snapshot.hasData
            ? Column(
                children: [
                  Expanded(
                    child: ListView.builder(
                      shrinkWrap: true,physics: ScrollPhysics(),itemCount: 
                 snapshot.data.length,itemBuilder: (context,index) {
                        List list = 
                         snapshot.data;
                        return ListTile(
                          title: Column(
                            children: [
                              Row(
                                
              mainAxisAlignment:
                                    
                  MainAxisAlignment.spaceBetween,children: [
                                  Expanded(
                                    child: 
                          InkWell(
                                        onTap: () 
              {
                                          
                  setState(() {
                                            
              goodsId = list[index]['id'];
                                            
              goodsName = list[index]['name'];
                                            
                 nameController.text =
                                                
                     list[index]['name'];
                                          });
                                          
             this._overlayEntry.remove();
                                          
               _searchFocus.unfocus();
                                          
                 print(goodsId);
                                          
                    print(goodsName);
                                        },child: 
                       FocusScope(
                                          node: 
                         FocusScopeNode(),child: 
                        Row(
                                            
                    mainAxisAlignment:
                                                
                        MainAxisAlignment
                                                    
                              .spaceEvenly,children: [
                                              
                    Flexible(
                                                
                     child: Text(
                                                  
                    list[index]['id'],overflow:
                                                      
              TextOverflow.ellipsis,maxLines: 1,softWrap: true,style: TextStyle(
                                                      
                fontSize: 18.0),),Flexible(
                                                
                     child: Text(
                                                  
                  list[index]['name'],overflow:
                                                      
                       TextOverflow.ellipsis,style: TextStyle(
                                                      
              fontSize: 18.0),],)),// SizedBox(
                                  //   width: 5,// )
                                ],)
                            ],);
                      },SizedBox(
                    height: 5,)
                ],)
            : Center(
                child: 
                 CircularProgressIndicator(),);
      },));
    }

   OverlayEntry _createOverlayEntry() {
        RenderBox renderBox = 
           context.findRenderObject();
            var size = renderBox.size;
               var offset = 
            renderBox.localToGlobal(Offset.zero);

           return OverlayEntry(
              builder: (context) => Positioned(
        left: // 58,offset.dx,top: //150,offset.dy + 95,width: size.width,bottom: 100,child: filteredList()));
         }

          @override
       Widget build(BuildContext context) {
        return Scaffold(
         body: Padding(
       padding: const EdgeInsets.all(58.0),child: Column(
      children: [
        TextFormField(
          textInputAction: TextInputAction.next,focusNode: _searchFocus,onFieldSubmitted: (term) {
            // _fieldFocusChange(context,_searchFocus,_overlayFocus);
            
   //_searchFocus.requestFocus(_overlayFocus);
            setState(() {
              isOverlayopen = 1;
              _overlayEntry.remove();
            });
          },controller: nameController,onChanged: (value) {
            setState(() {
              filter = value;
              text = value;
              _futureGoods = goodsList();
            });
            if (isOverlayopen == 1) {
              this._overlayEntry = 
      this._createOverlayEntry();
              
  Overlay.of(context).insert(this._overlayEntry);
              setState(() {
                isOverlayopen = 0;
              });
            } else {}
            //_createOverlayEntry();
          },//focusNode: this._focusNode,decoration: InputDecoration(labelText: 
   'Goods'),TextFormField(
          decoration: InputDecoration(labelText: 
       'Customer'),TextFormField(
          //focusNode: _getFocus,controller: vendorController,onChanged: (value) {
            setState(() {
              text = value;
            });
            // SearchCustomer();
          },decoration: InputDecoration(labelText: 
           'Vendor'),ElevatedButton(
            onPressed: () {
              Navigator.of(context).pop();
            },child: Text('Back')),);
        }
        }