Flutter 如何显示依赖于颤振中另一个字符串数据的数据？

我有两个选择框，显示一个AlertDialog。第一个在alertdialog中显示listview.builder，选项为“Havo”或“Vwo”。当用户选择Havo时，选项1-5必须显示在第二个警报对话框中。当用户选择Vwo时，选项1-6必须显示在第二个alertdialog中

这是我保存数据的列表： （同时保存其他数据，请忽略）

这就是我的代码的构建方式：

     import 'package:flutter/material.dart';
    
    import '../../models/studyOptionsModel.dart';
    
    class SetupScreenThreeForm extends StatefulWidget {
      @override
      _SetupScreenThreeFormState createState() => _SetupScreenThreeFormState();
    }
    
    class _SetupScreenThreeFormState extends State<SetupScreenThreeForm> {
      final _formKey = GlobalKey<FormState>();
      var _isLoginPage = false;
      var _schoolLevel = 'Niveau';
      var _classYear = 'Klas';
      var _bestSubjects = '';
    
      var selectionOptions = LEVELS.toList();
    
      //The alertdialog for setting the level
      createAlertDialog(BuildContext context, selectionType) {
        return showDialog(
            context: context,
            builder: (context) {
              return Dialog(
                  shape: RoundedRectangleBorder(
                      borderRadius: BorderRadius.circular(20)),
                  backgroundColor: Color(0xFF7E36EC),
                  child: ListView.builder(
                    shrinkWrap: true,
                    itemCount: selectionOptions.length,
                    itemBuilder: (context, index) {
                      return Padding(
                        padding: const EdgeInsets.all(8.0),
                        child: Column(
                          children: <Widget>[
                            InkWell(
                                onTap: () {
                                  setState(() {
                                    _schoolLevel = selectionOptions[index].level;
                                    print(_schoolLevel);
                                    Navigator.pop(context);
                                  });
                                },
                                child: ListTile(
                                    leading: Text(
                                  selectionOptions[index].level,
                                  style: TextStyle(
                                      color: Colors.white,
                                      fontFamily: 'Poppins',
                                      fontWeight: FontWeight.w500,
                                      fontSize: 14),
                                ))),
                          ],
                        ),
                      );
                    },
                  ));
            });
      }

  @override
  Widget build(BuildContext context) {
    return Column(
        mainAxisSize: MainAxisSize.min,
        crossAxisAlignment: CrossAxisAlignment.start,
        children: <Widget>[
          Column(
            mainAxisSize: MainAxisSize.min,
            children: <Widget>[
              SizedBox(
                height: 20,
              ),
              Container(
                width: double.infinity,
                height: 50,
                child: InkWell(
                  child: RaisedButton(
                    shape: RoundedRectangleBorder(
                        borderRadius: BorderRadius.circular(25)),
                    color: Color(0xFF7E36EC),
                    child: Align(
                      alignment: Alignment.centerLeft,
                      child: Text(
                        _schoolLevel,
                        style: TextStyle(
                            color: Colors.white,
                            fontFamily: 'Poppins',
                            fontWeight: FontWeight.w500,
                            fontSize: 14),
                      ),
                    ),
                    onPressed: () {
                      createAlertDialog(context, 'level');
                    },
                  ),
                ),
              ),
              SizedBox(
                height: 20,
              ),
              Container(
                width: double.infinity,
                height: 50,
                child: InkWell(
                  child: RaisedButton(
                    shape: RoundedRectangleBorder(
                        borderRadius: BorderRadius.circular(25)),
                    color: Color(0xFF7E36EC),
                    child: Align(
                      alignment: Alignment.centerLeft,
                      child: Text(
                        _classYear,
                        style: TextStyle(
                            color: Colors.white,
                            fontFamily: 'Poppins',
                            fontWeight: FontWeight.w500,
                            fontSize: 14),
                      ),
                    ),
                    onPressed: () {
                      createAlertDialog(context, 'years');
                    },
                  ),
                ),
              ),
              SizedBox(
                height: 20,
              ),
              Container(
                width: double.infinity,
                height: 50,
                child: InkWell(
                  child: RaisedButton(
                    shape: RoundedRectangleBorder(
                        borderRadius: BorderRadius.circular(25)),
                    color: Color(0xFF212121),
                    child: Align(
                      alignment: Alignment.centerLeft,
                      child: Text(
                        'Sterkste vakken',
                        style: TextStyle(
                            color: Colors.white,
                            fontFamily: 'Poppins',
                            fontWeight: FontWeight.w500,
                            fontSize: 14),
                      ),
                    ),
                    onPressed: () {},
                  ),
                ),
              ),
              SizedBox(
                height: 20,
              ),
              Container(
                width: double.infinity,
                height: 50,
                child: InkWell(
                  child: RaisedButton(
                    shape: RoundedRectangleBorder(
                        borderRadius: BorderRadius.circular(25)),
                    color: Color(0xFF212121),
                    child: Align(
                      alignment: Alignment.centerLeft,
                      child: Text(
                        'Minst sterkste vakken',
                        style: TextStyle(
                            color: Colors.white,
                            fontFamily: 'Poppins',
                            fontWeight: FontWeight.w500,
                            fontSize: 14),
                      ),
                    ),
                    onPressed: () {},
                  ),
                ),
              )
            ],
          )
        ]);
  }
}

导入“包装：颤振/材料.省道”；
导入“../models/studyOptionsModel.dart”；
类SetupScreenThreeForm扩展StatefulWidget{
@凌驾
_SetupScreenThreeFormState createState（）=>\u SetupScreenThreeFormState（）；
}
类_SetupScreenThreeFormState扩展状态{
final _formKey=GlobalKey（）；
var_isLoginPage=false；
var_学校级别=‘Niveau’；
var_classYear='Klas'；
var_bestSubjects=''；
var selectionOptions=LEVELS.toList（）；
//用于设置级别的alertdialog
createAlertDialog（BuildContext上下文，selectionType）{
返回显示对话框(
上下文：上下文，
生成器：（上下文）{
返回对话框(
形状：圆形矩形边框(
边界半径：边界半径。圆形（20）），
背景颜色：颜色（0xFF7E36EC），
子项：ListView.builder(
收缩膜：对，
itemCount:selectionOptions.length，
itemBuilder：（上下文，索引）{
返回填充(
填充：常数边集全部（8.0），
子：列(
儿童：[
墨水池(
onTap:（）{
设置状态（）{
_学校级别=选择选项[索引]。级别；
印刷品（学校级）；
Navigator.pop（上下文）；
});
},
孩子：ListTile(
前导：文本(
选择选项[索引]。级别，
样式：TextStyle(
颜色：颜色，白色，
fontFamily：“罂粟花”，
fontWeight:fontWeight.w500，
尺寸:14),，
))),
],
),
);
},
));
});
}
@凌驾
小部件构建（构建上下文）{
返回列(
mainAxisSize:mainAxisSize.min，
crossAxisAlignment:crossAxisAlignment.start，
儿童：[
纵队(
mainAxisSize:mainAxisSize.min，
儿童：[
大小盒子(
身高：20，
),
容器(
宽度：double.infinity，
身高：50，
孩子：InkWell(
孩子：升起按钮(
形状：圆形矩形边框(
边界半径：边界半径。圆形（25）），
颜色：颜色（0xFF7E36EC），
子对象：对齐(
对齐：alignment.centerLeft，
子：文本(
_学校层面，
样式：TextStyle(
颜色：颜色，白色，
fontFamily：“罂粟花”，
fontWeight:fontWeight.w500，
尺寸:14),，
),
),
已按下：（）{
createAlertDialog（上下文“级别”）；
},
),
),
),
大小盒子(
身高：20，
),
容器(
宽度：double.infinity，
身高：50，
孩子：InkWell(
孩子：升起按钮(
形状：圆形矩形边框(
边界半径：边界半径。圆形（25）），
颜色：颜色（0xFF7E36EC），
子对象：对齐(
对齐：alignment.centerLeft，
子：文本(
_学年，
样式：TextStyle(
颜色：颜色，白色，
fontFamily：“罂粟花”，
fontWeight:fontWeight.w500，
尺寸:14),，
),
),
已按下：（）{
createAlertDialog（上下文“年”）；
},
),
),
),
大小盒子(
身高：20，
),
容器(
宽度：double.infinity，
身高：50，
孩子：InkWell(
孩子：升起按钮(
形状：圆形矩形边框(
边界半径：边界半径。圆形（25）），
颜色：颜色（0xFF212121），
子对象：对齐(
对齐：alignment.centerLeft，
子：文本(
“Sterkste vakken”，
样式：TextStyle(
颜色：颜色，白色，
fontFamily：“罂粟花”，
fontWeight:fontWeight.w500，
尺寸:14),，
     import 'package:flutter/material.dart';
    
    import '../../models/studyOptionsModel.dart';
    
    class SetupScreenThreeForm extends StatefulWidget {
      @override
      _SetupScreenThreeFormState createState() => _SetupScreenThreeFormState();
    }
    
    class _SetupScreenThreeFormState extends State<SetupScreenThreeForm> {
      final _formKey = GlobalKey<FormState>();
      var _isLoginPage = false;
      var _schoolLevel = 'Niveau';
      var _classYear = 'Klas';
      var _bestSubjects = '';
    
      var selectionOptions = LEVELS.toList();
    
      //The alertdialog for setting the level
      createAlertDialog(BuildContext context, selectionType) {
        return showDialog(
            context: context,
            builder: (context) {
              return Dialog(
                  shape: RoundedRectangleBorder(
                      borderRadius: BorderRadius.circular(20)),
                  backgroundColor: Color(0xFF7E36EC),
                  child: ListView.builder(
                    shrinkWrap: true,
                    itemCount: selectionOptions.length,
                    itemBuilder: (context, index) {
                      return Padding(
                        padding: const EdgeInsets.all(8.0),
                        child: Column(
                          children: <Widget>[
                            InkWell(
                                onTap: () {
                                  setState(() {
                                    _schoolLevel = selectionOptions[index].level;
                                    print(_schoolLevel);
                                    Navigator.pop(context);
                                  });
                                },
                                child: ListTile(
                                    leading: Text(
                                  selectionOptions[index].level,
                                  style: TextStyle(
                                      color: Colors.white,
                                      fontFamily: 'Poppins',
                                      fontWeight: FontWeight.w500,
                                      fontSize: 14),
                                ))),
                          ],
                        ),
                      );
                    },
                  ));
            });
      }

  @override
  Widget build(BuildContext context) {
    return Column(
        mainAxisSize: MainAxisSize.min,
        crossAxisAlignment: CrossAxisAlignment.start,
        children: <Widget>[
          Column(
            mainAxisSize: MainAxisSize.min,
            children: <Widget>[
              SizedBox(
                height: 20,
              ),
              Container(
                width: double.infinity,
                height: 50,
                child: InkWell(
                  child: RaisedButton(
                    shape: RoundedRectangleBorder(
                        borderRadius: BorderRadius.circular(25)),
                    color: Color(0xFF7E36EC),
                    child: Align(
                      alignment: Alignment.centerLeft,
                      child: Text(
                        _schoolLevel,
                        style: TextStyle(
                            color: Colors.white,
                            fontFamily: 'Poppins',
                            fontWeight: FontWeight.w500,
                            fontSize: 14),
                      ),
                    ),
                    onPressed: () {
                      createAlertDialog(context, 'level');
                    },
                  ),
                ),
              ),
              SizedBox(
                height: 20,
              ),
              Container(
                width: double.infinity,
                height: 50,
                child: InkWell(
                  child: RaisedButton(
                    shape: RoundedRectangleBorder(
                        borderRadius: BorderRadius.circular(25)),
                    color: Color(0xFF7E36EC),
                    child: Align(
                      alignment: Alignment.centerLeft,
                      child: Text(
                        _classYear,
                        style: TextStyle(
                            color: Colors.white,
                            fontFamily: 'Poppins',
                            fontWeight: FontWeight.w500,
                            fontSize: 14),
                      ),
                    ),
                    onPressed: () {
                      createAlertDialog(context, 'years');
                    },
                  ),
                ),
              ),
              SizedBox(
                height: 20,
              ),
              Container(
                width: double.infinity,
                height: 50,
                child: InkWell(
                  child: RaisedButton(
                    shape: RoundedRectangleBorder(
                        borderRadius: BorderRadius.circular(25)),
                    color: Color(0xFF212121),
                    child: Align(
                      alignment: Alignment.centerLeft,
                      child: Text(
                        'Sterkste vakken',
                        style: TextStyle(
                            color: Colors.white,
                            fontFamily: 'Poppins',
                            fontWeight: FontWeight.w500,
                            fontSize: 14),
                      ),
                    ),
                    onPressed: () {},
                  ),
                ),
              ),
              SizedBox(
                height: 20,
              ),
              Container(
                width: double.infinity,
                height: 50,
                child: InkWell(
                  child: RaisedButton(
                    shape: RoundedRectangleBorder(
                        borderRadius: BorderRadius.circular(25)),
                    color: Color(0xFF212121),
                    child: Align(
                      alignment: Alignment.centerLeft,
                      child: Text(
                        'Minst sterkste vakken',
                        style: TextStyle(
                            color: Colors.white,
                            fontFamily: 'Poppins',
                            fontWeight: FontWeight.w500,
                            fontSize: 14),
                      ),
                    ),
                    onPressed: () {},
                  ),
                ),
              )
            ],
          )
        ]);
  }
}

if (userselection=='Havo'){
LEVELS.length(x) //x is the number of levels you want to show for example for 4 levels x=3
}