When i press the answer it go to anoter question flutter dart - flutter

Question

i have a problem which is when i press the answer my apps will go to other question with the answer has been select.
first when i don't shuffle the question it go to next question when i press next button but when i shuffle the question it go to next question when i press the answer
this my code
class HomeScreen extends StatefulWidget {
const HomeScreen({Key? key}) : super(key: key);
#override
_HomeScreenState createState() => _HomeScreenState();
}
class _HomeScreenState extends State<HomeScreen> {
var db = DBconnect();
Future<List<Question>> getData() async {
List<Question> list = await db.fetchQuestions();
List<Question> newList = list..shuffle();
return newList;
}
#override
void initState() {
super.initState();
}
int index = 0;
int score = 0;
bool isPressed = false;
bool isAlreadySelected = false;
//fungsi untuk paparkan soalan seterusnya
void nextQuestion(int questionLenght) {
if (index == questionLenght - 1) {
//Tempat Soalan berakhir
showDialog(
context: context,
barrierDismissible:
false, //disable untuk keluar dari box markah apabila klik diluar box
builder: (ctx) => ResultBox(
result: score, //jumlah keseluruhan markah
questionLenght: questionLenght,
onPressed: startOver,
));
} else {
if (isPressed) {
setState(() {
index++;
isPressed = false;
isAlreadySelected = false;
});
} else {
ScaffoldMessenger.of(context).showSnackBar(const SnackBar(
content: Text('Anda perlu memilih jawapan terlebih dahulu'),
behavior: SnackBarBehavior.floating,
margin: EdgeInsets.symmetric(vertical: 20.0),
));
}
}
}
//fungsi untuk tukar warna
void checkAnswerAndUpdate(bool value) {
if (isAlreadySelected) {
return;
} else {
if (value == true) {
score++;
}
setState(() {
isPressed = true;
isAlreadySelected = true;
});
}
}
//fungsi untuk mula kembali
void startOver() {
setState(() {
index = 0;
score = 0;
isPressed = false;
isAlreadySelected = false;
});
Navigator.pop(context);
}
#override
Widget build(BuildContext context) {
return FutureBuilder<List<Question>>(
future: getData(),
builder: (ctx, snapshot) {
if (snapshot.connectionState == ConnectionState.done) {
if (snapshot.hasError) {
return Center(
child: Text('${snapshot.error}'),
);
} else if (snapshot.hasData) {
var extractedData = snapshot.data;
return Scaffold(
backgroundColor: background,
appBar: AppBar(
title: const Text('MyKSSRQuiz'),
backgroundColor: background,
shadowColor: Colors.transparent,
actions: [
Padding(
padding: const EdgeInsets.all(18.0),
child: Text(
'Markah : $score',
style: const TextStyle(fontSize: 18.0),
),
),
],
),
body: Container(
width: double.infinity,
padding: const EdgeInsets.symmetric(
horizontal: 10.0, vertical: 10.0),
child: Column(
children: [
QuestionWidget(
indexAction: index, //kedududkan 0
question: extractedData![index]
.title, //Soalan pertama dalam senarai
totalQuestions: extractedData.length, //jumlah senarai'
),
const Divider(
//garis divider atas
color: neutral,
thickness: 1.0,
),
const SizedBox(height: 25.0), //pilihan jawapan
for (int i = 0;
i < extractedData[index].options.length;
i++)
GestureDetector(
//fungsi untuk semak jawapan
onTap: () => checkAnswerAndUpdate(
extractedData[index].options.values.toList()[i]),
child: OptionCard(
option: extractedData[index].options.keys.toList()[i],
color: isPressed
? extractedData[index]
.options
.values
.toList()[i] ==
true
? correct
: incorrect
: neutral,
),
),
],
),
),
//menggunkan butang floating untuk butang next
floatingActionButton: GestureDetector(
onTap: () => nextQuestion(extractedData.length),
child: const Padding(
padding: EdgeInsets.symmetric(horizontal: 10.0),
child: NextButton(),
),
),
floatingActionButtonLocation:
FloatingActionButtonLocation.centerFloat,
);
}
} else {
return const Center(
child: CircularProgressIndicator(),
);
}
return const Center(
child: Text('No Data'),
);
},
);
}
}
I been searcing in the many forum but still can not find the answer.hope somebody can help me with this.tq