Getting the total amount of the checkboxes - flutter

Question

I am a beginer to flutter
I am trying to get the total amount of checkboxes after checking it.
First Partof the code is working alright but the second part of the code is where I am having issues.
I want to be able to check the boxes, get the total amount in total checked
Please Help me.
import 'package:flutter/material.dart';
import 'package:google_fonts/google_fonts.dart';
import 'package:http/http.dart' as http;
import 'package:liquid_pull_to_refresh/liquid_pull_to_refresh.dart';
import 'dart:convert';
import 'dart:ffi';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:stachup/models/TeamModel.dart';
import 'package:stachup/models/newStaches.dart';
import 'package:stachup/models/TeamModel.dart';
class Stash extends StatefulWidget {
String first_name;
String token;
String referalcode;
String last_name;
Stash(
{Key? key,
required this.first_name,
required this.token,
required this.last_name,
required this.referalcode})
: super(key: key);
#override
State<Stash> createState() => _StashState();
}
class _StashState extends State<Stash> {
bool isChecked = false;
String? first_name;
String? token;
String? last_name;
String? referalcode;
bool setup = false;
String? setupError;
bool _isChecked = false;
late SharedPreferences logindata;
userData() async {
logindata = await SharedPreferences.getInstance();
first_name = logindata.getString('first_name')!;
last_name = logindata.getString('last_name')!;
referalcode = logindata.getString('referalcode')!;
token = logindata.getString('token')!;
setState(() {});
}
List<Team> teams = [];
Future getData() async {
var response = await http.get(Uri.https(
'incoming.isplitpay.com', 'api/durationlist', {'token': token}));
var jsonData = jsonDecode(response.body);
print(token);
for (var eachTeam in jsonData) {
var datetime = DateTime.parse(eachTeam["paid_date"]);
final team = Team(
id_pes: eachTeam['id_pes'],
amount: eachTeam['amount'],
paid_date: datetime,
);
teams.add(team);
}
// print(teams.length);
}
#override
void initState() {
super.initState();
userData();
}
#override
Widget build(BuildContext context) {
//getData();
return Scaffold(
backgroundColor: Colors.blue.shade50,
body: FutureBuilder(
future: getData(),
builder: ((context, snapshot) {
//if done loading show data
if (snapshot.connectionState == ConnectionState.done) {
return Container(
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(8),
),
child: ListView.builder(
itemCount: teams.length,
itemBuilder: (context, index) {
return Padding(
padding: const EdgeInsets.all(10.0),
child: Container(
height: 80,
decoration: BoxDecoration(
border: Border.all(
color: Colors.white,
),
color: Colors.grey[50],
borderRadius: BorderRadius.circular(12),
),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: [
Checkbox(
checkColor: Colors.white,
value: teams[index].isChecked ?? false,
onChanged: (bool? value) {
setState(() {
teams[index].isChecked = value;
});
print(value);
},
),
Text(
'GHS ' + teams[index].amount,
),
Column(
children: [
Padding(
padding: const EdgeInsets.only(top: 20.0),
child: Text(
'Savings for',
style: GoogleFonts.lato(
fontSize: 16,
),
),
),
Text(
"${teams[index].paid_date.day.toString().padLeft(2, '0')}-${teams[index].paid_date.month.toString().padLeft(2, '0')}-${teams[index].paid_date.year}",
style: GoogleFonts.lato(
fontSize: 16,
),
),
],
)
],
),
),
);
}),
);
//else show circule progress bar
} else {
return Center(
child: CircularProgressIndicator(),
);
}
}),
),
);
}
}
second part of the code
#override
Widget build(BuildContext context) {
var checkedList = dataList.where((data) => data.isChecked ?? false);
var totalAmount = checkedList.isNotEmpty
? 'TotalAmount:${checkedList.reduce((before, after) => Team(amount: '${double.parse(before.amount) + double.parse(after.amount)}', id_pes: '_', paid_date: DateTime.now())).amount} '
: '';
return Scaffold(
body: ListView.builder(
shrinkWrap: true,
itemCount: dataList.length,
itemBuilder: (context, index) {
return Tooltip(message: totalAmount, child: _buildListItem(index));
}));
}