The getter 'todoText' isn't defined for the class 'String' - flutter

Question

I am getting the following error in my code.
The getter 'todoText' isn't defined for the class 'String'.
Try importing the library that defines 'todoText', correcting the name to the name of an existing getter, or defining a getter or field named 'todoText'.dart(undefined_getter)
import 'package:flutter/material.dart';
import 'package:fluttertoast/fluttertoast.dart';
void main() => runApp(new ToDoApp());
class ToDoApp extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return new MaterialApp(
title: 'To Do Application',
theme: new ThemeData(
primarySwatch: Colors.teal,
),
home: new ToDoList(),
);
}
}
class ListItem{
bool _todoCheck;
ListItem(this._todoCheck);
}
class _strikeThrough extends StatelessWidget{
final String todoText;
final bool todoCheck;
_strikeThrough(this.todoText, this.todoCheck) : super();
Widget _widget(){
if(todoCheck){
return Text(
todoText,
style: TextStyle(
decoration: TextDecoration.lineThrough,
fontStyle: FontStyle.italic,
fontSize: 22.0,
color: Colors.red[200],
),
);
}
else{
return Text(
todoText,
style: TextStyle(
fontSize: 22.0
),
);
}
}
#override
Widget build(BuildContext context){
return _widget();
}
}
class ToDoList extends StatefulWidget {
#override
createState() => new _TodoListState();
}
class _TodoListState extends State<ToDoList> {
var textController = TextEditingController();
var popUpTextController = TextEditingController();
List<String> _todoItems = [];
List<ListItem> WidgetList =[];
void _addToDoItem(String task){
if(task.length > 0){
setState(()=> _todoItems.add(task));
}
}
void _removeToDoItem(int index){
setState(() => _todoItems.removeAt(index));
}
void _promptRemoveToDoItem(int index){
showDialog(context: context,
builder: (BuildContext context){
return new AlertDialog(
title: new Text('Mark "${_todoItems[index]}" as Completed?'+' This will remove this Item'),
actions: <Widget>[
new FlatButton(
child: new Text('CANCEL'),
onPressed: () => Navigator.of(context).pop()
),
new FlatButton(
child: new Text('MARK AS DONE'),
onPressed: () {
_removeToDoItem(index);
Navigator.of(context).pop();
Fluttertoast.showToast(
msg: 'ToDo Task Deleted!'
);
}
),
]
);
}
);
}
Widget _buildToDoList(BuildContext context){
return Column(
children: <Widget>[
new Flexible(
child: new ListView.builder(
itemBuilder: (context,index){
return _buildToDoItem(_todoItems[index], index);
},
),
),
new Expanded(
child: ReorderableListView(
children: <Widget>[
for(final widget in _todoItems)
for(final widget1 in WidgetList)
GestureDetector(
key: Key(widget.todoText),
child: Dismissible(
key: Key(widget.todoText),
child: CheckboxListTile(
value: widget1._todoCheck,
title: _strikeThrough(widget.todoText,widget1._todoCheck),
onChanged: (checkValue){
setState(() {
if(!checkValue){
widget1._todoCheck = false;
}
else{
widget1._todoCheck = true;
}
});
}),
background: Container(
child: Icon(Icons.delete),
alignment: Alignment.centerRight,
color: Colors.orange[300],
),
confirmDismiss: (dismissDirection){
return showDialog(
context: context,
barrierDismissible: true,
builder: (BuildContext context){
return AlertDialog(
title: Text("Delete Todo?"),
actions: <Widget>[
FlatButton(
child: Text("OK"),
onPressed: (){
Navigator.of(context).pop(true);
},
),
FlatButton(
child: Text("Cancel"),
onPressed: (){
Navigator.of(context).pop(true);
},),
],
);
});
},
direction: DismissDirection.endToStart,
movementDuration: const Duration(milliseconds: 200),
onDismissed: (dismissedDirection){
WidgetList.remove(widget);
Fluttertoast.showToast(
msg: "Todo Deleted!"
);
},
),
onDoubleTap: (){
popUpTextController.text = widget.todoText;
showDialog(
context: context,
barrierDismissible: true,
builder: (BuildContext context){
return AlertDialog(
title: Text("Edit ToDo"),
content: TextFormField(
controller: popUpTextController,
),
actions: <Widget>[
FlatButton(
child: Text("OK"),
onPressed: (){
setState(() {
widget.todoText=popUpTextController.text;
});
Navigator.of(context).pop(true);
},
),
FlatButton(
child: Text("Cancel"),
onPressed: (){
Navigator.of(context).pop(false);
},
)
],
);
}
);
},
)
],
onReorder: (oldIndex, newIndex){
setState(() {
if(oldIndex < newIndex){
newIndex -= 1;
}
var replaceWiget = WidgetList.removeAt(oldIndex);
WidgetList.insert(newIndex, replaceWiget);
});
},)
)
],
);
}
Widget _buildToDoItem(String todoText, int index){
return new ListTile(
title: new Text(todoText),
onLongPress: () => _promptRemoveToDoItem(index),
);
}
#override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text('To Do List')
),
body:_buildToDoList(context),
floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
floatingActionButton: new FloatingActionButton(
focusElevation: 7,
onPressed:_pushAddToDoScreen,
tooltip: 'Add Task',
child: new Icon(Icons.add)
),
drawer: Drawer(
child: ListView(
padding: const EdgeInsets.all(0),
children: <Widget>[
DrawerHeader(
child: Text('To Do App Drawer Header'),
decoration: BoxDecoration(
color: Colors.teal,
)
),
ListTile(
title: Text('Add Items'),
onTap: _pushAddToDoScreen,
),
ListTile(
title: Text('Remove Items'),
subtitle: Text('Long Press on any item to remove it'),
onTap: (){
Navigator.pop(context);
},
),
ListTile(
title: Text('Check Status of Items'),
subtitle: Text('If the item is in List, then it is Pending, else long press to mark it done'),
onTap: (){
Navigator.pop(context);
},
),
],
)
),
bottomNavigationBar: BottomAppBar(
shape: CircularNotchedRectangle(),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
IconButton(
icon: Icon(Icons.settings),
onPressed: () {},
),
IconButton(
icon: Icon(Icons.more_vert),
onPressed: () {},
)
]
)
)
);
}
void _pushAddToDoScreen(){
Navigator.of(context).push(
new MaterialPageRoute(
builder: (context){
return new Scaffold(
appBar: new AppBar(
title: new Text('Add a new task')
),
body: new TextField(
autofocus: true,
onSubmitted: (val){
_addToDoItem(val);
Navigator.pop(context);
},
decoration: new InputDecoration(
hintText: 'Enter Tasks....',
contentPadding: const EdgeInsets.all(16.0)
),
)
);
}
)
);
}
}