How can I add a button inside a dropdownButton in Flutter - flutter

Question

I just started learning flutter, I have programming knowledge before, but I am just getting used to the widget structure. What I want to do is add a button to the last element of the DropdownButton list and I used the DropdownMenuItem widget to do that. And I used Text as child and I put Button in the last element. The problem is, I can't give Text to the value property of the DropdownButton. That's why I'm getting an error because I've given a value that isn't in items [ ]. Is there any way I can get the value of the Text widget? Or can I do it another way? I hope I was explanatory.
code:
class _TodoPageState extends State<TodoPage> {
Text dropdownValue = Text('123'); // **FOR DEFAULT VALUE**
#override
Widget build(BuildContext context) {
return SafeArea(
child: Center(
child: Column(
// mainAxisAlignment: MainAxisAlignment.center,
// crossAxisAlignment: CrossAxisAlignment.center,
children: [
MyTabBar(),
Row(
children: [
Expanded(
child: Container(
margin: EdgeInsets.only(left: 3, top: 5),
child: Row(
children: [
Ink(
width: 152,
height: 45,
padding: EdgeInsets.all(6),
decoration: BoxDecoration(
border: Border.all(color: Colors.black, width: 2),
borderRadius: BorderRadius.circular(10),
),
child: DropdownButtonHideUnderline(
child: DropdownButton<String>(
value: dropdownValue, **// CANT SET THE DEFAULT VALUE**
isExpanded: true,
icon: Image.asset('assets/down-list-arrow.png'),
iconSize: 10,
elevation: 16,
onChanged: (newValue) {
setState(() {
dropdownValue = newValue!; **// CANT SET THE DEFAULT VALUE**
});
},
items: [
DropdownMenuItem(child: Text('123'), value: ''),
DropdownMenuItem(child: Text('123'), value: ''),
DropdownMenuItem(
child: TextButton(
child: Text('Create'),
onPressed: () {},
))
],
),
),
)
],
),
),
),
],
),
MyListView()
],
),
));
}
}

Answer 1

I found 2 ways: Assigning create on values or check new value before assigning on onChanged and using FocusNode.
Test Widget
class TodoPage extends StatefulWidget {
TodoPage({Key? key}) : super(key: key);
#override
_TodoPageState createState() => _TodoPageState();
}
class _TodoPageState extends State<TodoPage> {
late String selectedValue; // **FOR DEFAULT VALUE**
late String selectedValue2;
List<String> dropDownItemValue = ['123', '2', '4', 'Create'];
List<String> dropDownItemValue2 = ['xx', '2', '4'];
late final dropDownKey2;
final FocusNode dropDownFocus = FocusNode();
#override
void initState() {
super.initState();
///selected value must be contain at dropDownItemValue
selectedValue = dropDownItemValue[0];
selectedValue2 = dropDownItemValue2[0];
}
#override
Widget build(BuildContext context) {
return SafeArea(
child: Scaffold(
backgroundColor: Colors.deepPurple,
body: Center(
child: Column(
// mainAxisAlignment: MainAxisAlignment.center,
// crossAxisAlignment: CrossAxisAlignment.center,
children: [
// MyTabBar(),
DropdownButtonHideUnderline(
child: DropdownButton<String>(
value: selectedValue, // CANT SET THE DEFAULT VALUE**
isExpanded: true,
// icon: Image.asset('assets/down-list-arrow.png'),
iconSize: 10,
elevation: 16,
onChanged: (newValue) {
print(newValue);
setState(() {
selectedValue = newValue!; // SET THE DEFAULT VALUE**
});
},
/// dont assing same value on multiple widget
items: List.generate(
dropDownItemValue.length,
(index) => DropdownMenuItem(
child: Text('${dropDownItemValue[index]}'),
value: '${dropDownItemValue[index]}'),
),
),
),
SizedBox(
height: 100,
),
DropdownButtonHideUnderline(
child: DropdownButton<String>(
focusNode: dropDownFocus,
value: selectedValue2, // CANT SET THE DEFAULT VALUE**
isExpanded: true,
// icon: Image.asset('assets/down-list-arrow.png'),
iconSize: 10,
elevation: 16,
onChanged: (newValue) {
print(newValue == null);
// if value doesnt contain just close the dropDown
if (newValue == null) {
dropDownFocus.unfocus();
} else
setState(() {
selectedValue2 = newValue; // SET THE DEFAULT VALUE**
});
},
/// dont assing same value on multiple widget
items: List.generate(
dropDownItemValue2.length + 1,
(index) => index < dropDownItemValue2.length
? DropdownMenuItem(
child: Text('${dropDownItemValue2[index]}'),
value: '${dropDownItemValue2[index]}')
: DropdownMenuItem(
child: TextButton(
child: Text('Create'),
onPressed: () {},
),
),
),
),
),
],
),
),
));
}
}