onPressed create multiple instances of CheckboxListTile in Flutter - flutter

Question

I'm new to flutter so I'm not sure how to go about this. I want to be able to add another instance of the same CheckboxListTile when a user presses a button right below the most recent CheckboxListTile.
The code for how it currently is is below.
Widget build(BuildContext context) {
return ListView(
children: <Widget>[
CheckboxListTile(
title: TextField(
autocorrect: true,
),
value: checkBoxValue,
secondary: Icon(Icons.assignment),
onChanged: (bool newValue) {
setState(() {
checkBoxValue = newValue;
});
}
),
],
The code of an example of how I would want the app to appear after a user presses is below.
Widget build(BuildContext context) {
return ListView(
children: <Widget>[
CheckboxListTile(
title: TextField(
autocorrect: true,
),
value: checkBoxValue,
secondary: Icon(Icons.assignment),
onChanged: (bool newValue) {
setState(() {
checkBoxValue = newValue;
});
}
),
CheckboxListTile(
title: TextField(
autocorrect: true,
),
value: checkBoxValue,
secondary: Icon(Icons.assignment),
onChanged: (bool newValue) {
setState(() {
checkBoxValue = newValue;
});
}
),
],
Thanks in advance!

Answer 1

Generating widgets in a ListView is by adding List<Widget> in its children. Simply put, it roughly looks similar to.
ListView(
children: <Widget>[widgetA, widgetA, widgetC]);
What you need to do is to manually add widgets in List<Widget>. You can create a List<Widget> _checkboxList and create a function that returns a CheckboxListTile widget.
CheckboxListTile _checkboxListTile(){
return CheckboxListTile(
title: TextField(
autocorrect: true,
),
value: checkBoxValue,
secondary: Icon(Icons.assignment),
onChanged: (bool newValue) {
setState(() {
checkBoxValue = newValue;
});
}
);
}
and on your button, call _checkboxList.add(_checkboxListTile()); to add it on List<Widget> _checkboxList
RaisedButton(
onPressed: () {
setState(() {
_checkboxList.add(_checkboxListTile());
});
},
child: Text('Add checkbox'),
),
To display List _checkboxList on your screen:
Widget build(BuildContext context) {
return ListView(children: _checkboxList);
}
Let me know if this helps.

Answer 2

One way you could do it is by using a ListView.builder like this..
class MyWidget extends StatefulWidget {
#override
_MyWidgetState createState() => _MyWidgetState();
}
class _MyWidgetState extends State<MyWidget> {
List<bool> checkBoxesCheckedStates = [false];
#override
Widget build(BuildContext context) {
return Column(
children: <Widget>[
Expanded(
child: ListView.builder(
itemCount: checkBoxesCheckedStates.length,
itemBuilder: (BuildContext context, int index){
return CheckboxListTile(
title: TextField(
autocorrect: true,
),
value: checkBoxesCheckedStates[index],
secondary: Icon(Icons.assignment),
onChanged: (bool newValue) {
setState(() {
checkBoxesCheckedStates[index] = newValue;
});
},
);
},
),
),
RaisedButton(
child: Text('Add'),
onPressed: (){
setState(() {
checkBoxesCheckedStates.add(false);
});
},
),
],
);
}
}