Flutter 选中时,颤振中的checkboxlisttile未显示勾号

Flutter 选中时,颤振中的checkboxlisttile未显示勾号,flutter,android-studio,Flutter,Android Studio,我在listview生成器中使用了checkboxlisttile。问题是,即使我点击它,也并没有记号。但当我打印值时,它会显示true。当我再次单击它时,它仍然为真(不是假),但没有勾号。 实际上,我正在动态创建列表。我有一个屏幕new_note.dart,我在note表的数据库中保存了一个note。保存的节点显示在此列表中所有选项卡下的note_info.dart中。在“已完成”选项卡中,我想显示已完成的注释,即将标记为选中的注释。我在TabBarView的容器中调用这个方法getNotec

我在listview生成器中使用了checkboxlisttile。问题是,即使我点击它,也并没有记号。但当我打印值时,它会显示true。当我再次单击它时,它仍然为真(不是假),但没有勾号。 实际上,我正在动态创建列表。我有一个屏幕new_note.dart,我在note表的数据库中保存了一个note。保存的节点显示在此列表中所有选项卡下的note_info.dart中。在“已完成”选项卡中,我想显示已完成的注释,即将标记为选中的注释。我在TabBarView的容器中调用这个方法getNotecheckList

ListView getNotecheckList() {
    bool _isChecked=false;
    return ListView.builder(
        itemCount: count,
        itemBuilder: (BuildContext context, int position) {

      return Card(
          color: Colors.white,
          elevation: 2.0,
          child: CheckboxListTile(
            title: Text(this.noteList[position].note),
            subtitle: Text(this.noteList[position].actn_on),
            //secondary: const Icon(Icons.web),
            value:_isChecked,
            onChanged: (bool value) {
              setState(() {
                _isChecked=value;
              });
              },
            controlAffinity: ListTileControlAffinity.leading,
          ),
      );

},);}
我的代码中的所有内容似乎都是正确的。那是什么错误呢。 我甚至试过 _isChecked=_检查

注_info.dart

import 'dart:io';
import 'package:vers2cts/models/note_model.dart';
import 'package:vers2cts/models/customer_model.dart';
import 'package:vers2cts/services/db_service.dart';
import 'package:vers2cts/utils/db_helper.dart';
import 'package:flutter/material.dart';
import 'package:sqflite/sqflite.dart';

import 'new_note.dart';


class Note_Info extends StatefulWidget{
  final String appBarTitle;
  final CustomerModel customer;

 
  Note_Info(this. customer, this.appBarTitle);

  @override
  State<StatefulWidget> createState() {
    
   return Note_InfoState(this. customer,this.appBarTitle);
  }

}

class Note_InfoState extends State<Note_Info> {
  DBService dbService = DBService();
  List<NoteModel> noteList;
  int count = 0;

  static final GlobalKey<ScaffoldState> scaffoldKey = new GlobalKey<ScaffoldState>();
  NoteModel note=NoteModel();
  String appBarTitle;
  CustomerModel customer=new CustomerModel();
  Note_InfoState(this.customer, this.appBarTitle);


  bool rememberMe = false;
  DateTime _date = DateTime.now();
  TextEditingController custfNameController = TextEditingController();

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


  @override
  Widget build(BuildContext context) {
  updateListView();
    if (noteList == null) {
      noteList = List<NoteModel>();
      updateListView();
    }

    TextStyle titleStyle = Theme.of(context).textTheme.subhead;
    var height = MediaQuery.of(context).size.height;
    var name=customer.first_name+" "+customer.last_name;
    custfNameController.text = name;

    return DefaultTabController(
        length: 4,
        child: Scaffold(
            appBar: AppBar(
              actions: [
                IconButton(
                  icon: Icon(
                    Icons.add,

                  ),
                  onPressed: () {
                    Navigator.of(context).push(MaterialPageRoute(
                        builder: (BuildContext context) => NewNote(customer,note)));
                  },
                )
              ],
            ),
            body: Container(
              child: Column(
                  children: <Widget>[
                    TextField(controller: custfNameController,
                        style: TextStyle(
                            fontSize: 20.0, fontWeight: FontWeight.bold),

                        textAlign: TextAlign.center),
                    Padding(
                      padding: const EdgeInsets.all(15.0),
                      child: Row(children: [
                        ImageProfile(customer.cust_photo),
                        Padding(
                          padding: const EdgeInsets.only(left: 30.0),
                          child: IconButton(
                            icon: Icon(
                              Icons.call,
                              color: Colors.green,
                              size: 45,
                            ),
                            onPressed: () {

                            },
                          ),
                        ),

                      ],),
                    ),

                    SizedBox(
                      height: 50,
                      child: AppBar(
                        bottom: TabBar(
                          tabs: [
                            Tab(
                              text: "All",
                            
                            ),
                            Tab(
                              text: "Pending",
                            
                            ),
                            Tab(
                              text: "Cancelled",
                             
                            ),
                            Tab(
                              text: "Completed",
                             
                            ),
                          ],
                        ),
                      ),
                    ),

                    // create widgets for each tab bar here
                    Expanded(
                      child: TabBarView(
                        children: [
                          // first tab bar view widget
                          Container(
                              child: getNotecheckList()
                          ),

                          // second tab bar viiew widget
                          Container(

                          ),


                          Container(
                            child: Center(
                              child: Text(
                                'Cancelled',
                              ),
                            ),
                          ),
                          Container(

                            child: Center(
                              child: Text(
                                'Completed',
                              ),
                            ),
                          ),
                        ],
                      ),
                    ),
                    Padding(
                      padding: const EdgeInsets.all(8.0),
                      child: Container(
                        height: 55.0,
                        width: 200,
                        child: RaisedButton(
                          elevation: 2,

                          shape: RoundedRectangleBorder(
                              borderRadius: BorderRadius.circular(20)),
                          color: Theme
                              .of(context)
                              .primaryColorDark,
                          textColor: Colors.white,
                          child: Text('Save', textScaleFactor: 1.5,),
                          onPressed: () {
                            setState(() {
                              //_reset();
                            });
                          },
                        ),
                      ),
                    ),
                  ]
              ),
            )
        ));
  }

  Widget ImageProfile(String fileName) {
    return Center(
      child: CircleAvatar(
          radius: 80.0,
          backgroundImage:  fileName == null
              ?AssetImage('images/person_icon.jpg')
              :FileImage(File(customer.cust_photo))),

    );

  }


  
  Future<void> updateListView() {
    final Future<Database> dbFuture = DB.init();
    dbFuture.then((database) {
      int cid=customer.cust_id;

      Future<List<NoteModel>> noteListFuture = dbService.getCustomerNotes(cid);
      noteListFuture.then((noteList) {

        setState(() {
          this.noteList = noteList;
          this.count = noteList.length;
        });
      });
    });
  }
  ListView getNotecheckList() {

    return ListView.builder(
        itemCount: count,
        itemBuilder: (BuildContext context, int position) {

          int _isChecked = -1;

        return Card(
          color: Colors.white,
          elevation: 2.0,
          child: CheckboxListTile(
            title: Text(this.noteList[position].note),
            subtitle: Text(this.noteList[position].actn_on),
            //secondary: const Icon(Icons.web),
            value: _isChecked,
            onChanged: (bool value) {
              setState(() {
                _isChecked = value;
              });
            },
            controlAffinity: ListTileControlAffinity.leading,
            
              });
            },
                ),
            );
          },
         );
        }

  }
导入'dart:io';
导入“包装:vers2cts/models/note_model.dart”;
导入“包装:vers2cts/models/customer_model.dart”;
导入“包:vers2cts/services/db_service.dart”;
导入“package:vers2cts/utils/db_helper.dart”;
进口“包装:颤振/材料.省道”;
导入“包:sqflite/sqflite.dart”;
导入“new_note.dart”;
类注释\u信息扩展StatefulWidget{
最终字符串appBarTitle;
最终客户模型客户;
注释信息(this.customer,this.appBarTitle);
@凌驾
状态createState(){
返回注释_InfoState(this.customer,this.appBarTitle);
}
}
类注释\u InfoState扩展状态{
DBService DBService=DBService();
列表注释列表;
整数计数=0;
静态最终GlobalKey脚手架键=新的GlobalKey();
NoteModel note=NoteModel();
字符串appBarTitle;
CustomerModel customer=新CustomerModel();
注意:InfoState(this.customer,this.appBarTitle);
bool rememberMe=false;
DateTime _date=DateTime.now();
TextEditingController custfNameController=TextEditingController();
@凌驾
void initState(){
super.initState();
}
@凌驾
小部件构建(构建上下文){
updateListView();
如果(noteList==null){
noteList=List();
updateListView();
}
TextStyle titleStyle=Theme.of(context).textTheme.subhead;
var height=MediaQuery.of(context).size.height;
变量名称=客户。名字+“”+客户。姓氏;
custfNameController.text=名称;
返回DefaultTabController(
长度:4,
孩子:脚手架(
appBar:appBar(
行动:[
图标按钮(
图标:图标(
Icons.add,
),
已按下:(){
导航器.of(上下文).push(MaterialPageRoute(
生成器:(BuildContext上下文)=>NewNote(客户,注释));
},
)
],
),
主体:容器(
子:列(
儿童:[
TextField(控制器:custfNameController,
样式:TextStyle(
fontSize:20.0,fontWeight:fontWeight.bold),
textAlign:textAlign.center),
填充物(
填充:常数边集全部(15.0),
子对象:行(子对象:[
ImageProfile(客户照片),
填充物(
填充:仅限常量边集(左:30.0),
孩子:我的钮扣(
图标:图标(
图标。呼叫,
颜色:颜色。绿色,
尺码:45,
),
已按下:(){
},
),
),
],),
),
大小盒子(
身高:50,
孩子:AppBar(
底部:选项卡栏(
选项卡:[
标签(
文本:“全部”,
),
标签(
文本:“待定”,
),
标签(
文字:“已取消”,
),
标签(
正文:“已完成”,
),
],
),
),
),
//在此处为每个选项卡栏创建小部件
扩大(
子项:选项卡视图(
儿童:[
//第一个选项卡栏视图小部件
容器(
孩子:getNotecheckList()
),
//第二个选项卡栏视图小部件
容器(
),
容器(
儿童:中心(
子:文本(
“取消”,
),
),
),
容器(
儿童:中心(
子:文本(
"完成",,
),
),
),
],
),
),
填充物(
填充:常数边集全部(8.0),
子:容器(
身高:55.0,
宽度:200,
孩子:升起按钮(
标高:2,
形状:圆形
....
bool _isChecked=false;
@override
  Widget build(BuildContext context) {
    ......
  }
class MyWidget extends StatefulWidget {
  @override
  _MyWidgetState createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  int _isChecked = -1;
  @override
  Widget build(BuildContext context) {
    return ListView.builder(
      itemCount: 10,
      itemBuilder: (BuildContext context, int position) {
        return Card(
          color: Colors.white,
          elevation: 2.0,
          child: CheckboxListTile(
            title: Text("hi"),
            subtitle: Text("this.noteList[position].actn_on"),
            //secondary: const Icon(Icons.web),
            value: position== _isChecked,
            onChanged: (bool value) {
              setState(() {
                _isChecked = value?position:-1;
              });
            },
            controlAffinity: ListTileControlAffinity.leading,
          ),
        );
      },
    );
  }
}