Issue with statefulWidget unable to make desired changes - flutter

Question

I am working on a statefulWidget and my purpose is to make sure that the next button is not clickable until an option (in this language is selected). However it doesn't seem to work, I also added Yaesin's(Someone who answered) answer to the code
ListView.builder(
itemCount: histoires.length,
itemBuilder: (context, index) {
return ListTile(
title: Text(
histoires[index].title,
style: TextStyle(color: Colors.pink),
),
trailing: IconButton(
icon: Icon(Icons.play_arrow),
onPressed: () {
showDialog(
context: context,
builder: (BuildContext context) {
return StatefulBuilder(
builder: (context, setState) =>
AlertDialog(
content: Column(children: [
InkWell(
onTap: () {
_handleTap;
},
child: ListTile(
trailing: Icon(Icons
.flag_circle_rounded),
title: Text(
"French",
style: TextStyle(
color: Colors
.blueGrey),
))),
_active
? InkWell(
onTap: () {},
child: Image.asset(
"assets/nextactive.png",
height: height * 0.2,
width: width * 0.4),
)
: Image.asset(
"assets/nextinactive.png",
height: height * 0,
width: width * 0)
]),
));
});
}));
}),

Answer 1

To update dialog UI, you can use StatefulBuilder's setState
return StatefulBuilder(
builder: (context, setState) =>
AlertDialog(
content: Column(children: [
While using separate method, pass the StatefulBuilder's setState to the function. For your case, it will be
onPressed: () async {
await showDialog(
context: context,
builder: (BuildContext context) {
return StatefulBuilder(
builder: (context, setStateSB) => AlertDialog(
content: Column(children: [
InkWell(
onTap: () {
_handleTap(setStateSB);
},
child: ListTile(
Also make sure to receive this setStateSB(renamed to avoid confusion with state's setState).
_handleTap(setStateSB){ ....
More about using StatefulBuilder

Answer 2

Since your in a Dialog, for setState to work, you need to wrap it with a StatefulBuilder.
You haven't included your full code, so I'm using this example taken from the docs:
await showDialog<void>(
context: context,
builder: (BuildContext context) {
int? selectedRadio = 0;
return AlertDialog(
content: StatefulBuilder(
builder: (BuildContext context, StateSetter setState) {
return Column(
mainAxisSize: MainAxisSize.min,
children: List<Widget>.generate(4, (int index) {
return Radio<int>(
value: index,
groupValue: selectedRadio,
onChanged: (int? value) {
setState(() => selectedRadio = value);
},
);
}),
);
},
),
);
},
);
See also
A YouTube video by the Flutter team explaining StatefulBuilder