I tried to fetch data from firestore to chip widgets but then show "LateInitializationError". How I solve it? - flutter

Question

I tried to fetch data from firestore to chip widgets but then show "LateInitializationError". And also chips should be can multi selection(select many chips). And also how to align 4 chips in a row like this example?I my code I think chips are show like ListView.
error..
I mean like this..
my code..
class uitry extends StatefulWidget {
const uitry({Key? key}) : super(key: key);
#override
State<uitry> createState() => _uitryState();
}
#override
Future<List<Words12>> fetchRecords() async {
var records = await FirebaseFirestore.instance.collection('12words').get();
return mapRecords(records);
}
List<Words12> mapRecords(QuerySnapshot<Map<String, dynamic>> records) {
var _list = records.docs
.map(
(words12) => Words12(
id: words12.id,
wordName: words12['wordName'],
categoryName: words12['categoryName'],
),
)
.toList();
return _list;
}
late int defaultChoiceIndex;
#override
void initState() {
initState();
defaultChoiceIndex = 0;
}
child: SizedBox(
width: width * 0.94,
height: height * 0.30,
child: FutureBuilder<List<Words12>>(
future: fetchRecords(),
builder: (context, snapshot) {
if (snapshot.hasError) {
return Text('Error: ${snapshot.error}');
} else {
List<Words12> data = snapshot.data ?? [];
return ListView.builder(
itemCount: data.length,
itemBuilder: (context, index) {
return (ChoiceChip(
label: Text(data[index].wordName),
selected: defaultChoiceIndex == index,
selectedColor: Colors.deepPurple,
onSelected: (value) {
setState(() {
defaultChoiceIndex =
value ? index : defaultChoiceIndex;
});
},
// backgroundColor: color,
elevation: 1,
padding: const EdgeInsets.symmetric(
horizontal: 5.0),
));
},
);
}
}),
),

Answer 1

#override
void initState() {
initState();
defaultChoiceIndex = 0;
}
Should be:
#override
void initState() {
super.initState();
defaultChoiceIndex = 0;
}
I believe it will initialize your defaultChoiceIndex then.
For the alignment of chips: Wrap your ChoiceChip in the ListView.builder in a Row(), with a mainAxisAlignment of your choosing:
return Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
ChoiceChip(etc.),
],
),

Answer 2

I tried it .Now it working..
code
SizedBox(
width: width * 0.94,
height: height * 0.30,
child: Column(
children: <Widget>[
const SizedBox(height: 16),
Wrap(
children: hobbyList.map(
(hobby) {
bool isSelected = false;
if (selectedHobby!.contains(hobby)) {
isSelected = true;
}
return GestureDetector(
onTap: () {
if (!selectedHobby!.contains(hobby)) {
if (selectedHobby!.length < 50) {
selectedHobby!.add(hobby);
setState(() {});
print(selectedHobby);
}
} else {
selectedHobby!.removeWhere(
(element) => element == hobby);
setState(() {});
print(selectedHobby);
}
},
child: Container(
margin: const EdgeInsets.symmetric(
horizontal: 5, vertical: 4),
child: Container(
padding: const EdgeInsets.symmetric(
vertical: 5, horizontal: 12),
decoration: BoxDecoration(
color: isSelected
? HexColor('#F5F185')
: HexColor('#D9D9D9'),
borderRadius:
BorderRadius.circular(18),
border: Border.all(
color: isSelected
? HexColor('#F5F185')
: HexColor('#D9D9D9'),
width: 2)),
child: Text(
hobby,
style: TextStyle(
color: isSelected
? Colors.black
: Colors.black,
fontSize: 14,
fontWeight: FontWeight.w600),
),
),
),
);
},
).toList(),
),
],
),
),
class _uitryState extends State<uitry> {
List<String> hobbyList = [
'Shopping',
'Brunch',
'Music',
'Road Trips',
'Tea',
'Trivia',
'Comedy',
'Clubbing',
'Drinking',
'Wine',
];
List<String>? selectedHobby = [];