RangeError (index): Invalid value: Valid value range is empty: 0 error is coming - flutter

Question

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/widgets.dart';
import 'package:greycell_app/src/commons/actions/dialog_handler.dart';
import 'package:greycell_app/src/commons/themes/textstyle.dart';
import 'package:greycell_app/src/commons/widgets/error_data.dart';
import 'package:greycell_app/src/manager/main_model.dart';
import 'package:greycell_app/src/models/payment/due_detail.dart';
import 'package:greycell_app/src/models/payment/payable_fee.dart';
import 'package:greycell_app/src/models/response/response.dart';
import 'package:greycell_app/src/models/response/success.dart';
import 'package:greycell_app/src/views/accountViews/account_header.dart';
import 'package:greycell_app/src/views/accountViews/pay_option.dart';
import 'package:greycell_app/src/views/paymentViews/payable_tile.dart';
import 'package:greycell_app/src/views/paymentViews/payment_confirmation_screen.dart';
import 'package:greycell_app/src/views/paymentViews/payment_edit_field_view.dart';
import 'package:scoped_model/scoped_model.dart';
class PaymentBodyView extends StatefulWidget {
final DueDetail dueDetail;
final MainModel model;
//
const PaymentBodyView({this.dueDetail, this.model});
#override
_MyPaymentScreenState createState() => _MyPaymentScreenState();
}
class _MyPaymentScreenState extends State<PaymentBodyView> {
final TextEditingController _paymentEditController = TextEditingController();
final TextEditingController _paymentSearchController =
TextEditingController();
final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
final double minValue = 8.0;
DueDetail _dueDetail;
double _totalFeeAmount = 0.0;
/// Is user is Scrolling
bool isScrollDown = false;
ScrollController _scrollController;
// Current Index
int _currentIndex = -999999;
void setUp() {
if (_dueDetail.getPayAmtFrom == 'FA') {
// There will be one custom payable fee in the list: for more info check Account Service for FA
widget.model.addPayableFee(_dueDetail.payableFeeDetails.first);
}
}
void _onCreated() async {
_dueDetail = widget.dueDetail;
if (_dueDetail == null) {
// Make Api Call and Get Data
final ResponseMania _result = await widget.model.getAccountDueDetail();
if (_result is Success) {
_dueDetail = _result.success;
setUp();
_calculateAmount();
}
} else {
// You have transaction data
setUp();
_calculateAmount();
}
}
void _calculateAmount() {
if (_dueDetail != null && _dueDetail.payableFeeDetails != null) {
_dueDetail.payableFeeDetails.forEach((PayableFee fee) {
_totalFeeAmount += fee.feeAmount;
});
}
setState(() {});
}
void _onPayableTap(int index) {
if (!mounted) return;
setState(() {
if (_currentIndex == index) {
_currentIndex = -99999;
}
else {
_currentIndex = index;
}
});
}
void _onAddPayableFee(int index, PayableFee selectedFee) {
widget.model.addPayableFee(selectedFee);
_showSnackBar("Added to the payment");
setState(() {
_currentIndex = -99999;
});
}
void _onEditPayableFee(int index, PayableFee selectedFee) async {
_paymentEditController.text = selectedFee.feeAmount.toString();
DialogHandler.onCustomAlertDialog(
title: "Edit amount",
context: context,
content: PaymentEditTextFiled(
context: context,
key: _formKey,
fee: selectedFee,
paymentEditController: _paymentEditController,
).build(),
onSubmit: () {
if (_formKey.currentState.validate()) {
selectedFee.netPayAbleAmount =
double.parse(_paymentEditController.text);
widget.model.editPayableAmount(index, selectedFee);
Navigator.of(context).pop();
_showSnackBar("Updated and added to the payment");
}
});
}
void _onRemovePayableFee(int index, PayableFee selectedFee) {
print("remove Called");
widget.model.removePayableFee(selectedFee);
_showSnackBar("Successfully removed");
setState(() {
_currentIndex = -99999;
});
}
void _onProceedToPay() {
Navigator.of(context)
.push(MaterialPageRoute(
builder: (_) => PaymentConfirmationScreen(
model: widget.model,
dueDetail: _dueDetail,
totalFeeAmount: _totalFeeAmount,
totalPayAbleAmount: widget.model.totalPayableAmount,
payableFees: widget.model.selectedPayableFees
// payableFees: <PayableFee>[_dueDetail.payableFeeDetails[0]],
)))
.then((value) {});
}
void _reset() {
widget.model.clearSelectedPayable();
}
#override
void dispose() {
_scrollController.dispose();
_reset();
super.dispose();
}
#override
void initState() {
super.initState();
_onCreated();
_scrollController = ScrollController(initialScrollOffset: 0.0);
}
bool get isNotDueFound =>
_dueDetail.payableFeeDetails == null ||
_dueDetail.payableFeeDetails.length == 0;
void onAllSelectChanged(bool value) {}
void _showSnackBar(String msg) {
Scaffold.of(context).showSnackBar(SnackBar(
content: Text(
"$msg",
style: CustomTextStyle(context).caption.apply(color: Colors.white),
),
backgroundColor: Colors.green[400],
));
}
Widget _buildPaymentButton() {
return Container(
width: MediaQuery.of(context).size.width,
height: 50.0,
decoration: BoxDecoration(
gradient: LinearGradient(
begin: Alignment.centerLeft,
end: Alignment.centerRight,
colors: [Colors.blue, Theme.of(context).primaryColor])),
child: MaterialButton(
padding: EdgeInsets.all(15.0),
onPressed: _onProceedToPay,
child: Text(
"Proceed to pay",
style: CustomTextStyle(context)
.subtitle1
.apply(color: Colors.white, fontWeightDelta: 1),
),
textColor: Colors.white,
),
);
}
Widget _buildTotalAmount() {
return Container(
padding: EdgeInsets.symmetric(horizontal: 12.0, vertical: 15.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text("Total fee amount"),
Text(
"₹${_totalFeeAmount}",
style: CustomTextStyle(context)
.subtitle1
.apply(fontWeightDelta: 1),
)
],
),
SizedBox(
height: 12.0,
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text("Net payable amount"),
ScopedModelDescendant(builder: (_, __, MainModel model) {
return Text(
"₹${model.totalPayableAmount}",
style: CustomTextStyle(context)
.subtitle1
.apply(fontWeightDelta: 1),
);
})
],
),
],
),
);
}
Widget _buildFinalAmount() {
return ScopedModelDescendant(builder: (_, __, MainModel model) {
return Container(
padding: EdgeInsets.all(16),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Text(
"Final Payable Amount",
style: CustomTextStyle(context).subtitle2,
),
Flexible(
child: Text(
"₹${model.totalPayableAmount}",
style: CustomTextStyle(context).headline6,
),
),
],
),
);
});
}
Widget _buildFAbody() {
final PayableFee _fee = _dueDetail.payableFeeDetails.first;
return Container(
child: Card(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
PayableTile(
isEditable: false,
isSelected: false,
payableFee: _fee,
),
_dueDetail.getPolicyValue != "P"
? Container()
: Row(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Padding(
padding: const EdgeInsets.only(left: 15.0),
child: Text(
"Partially Pay",
style: CustomTextStyle(context).subtitle2,
),
),
MaterialButton(
onPressed: () => _onEditPayableFee(0, _fee),
child: Text("Change"),
padding: EdgeInsets.symmetric(vertical: 15.0),
)
],
),
Divider(),
_buildFinalAmount(),
SizedBox(
height: 20.0,
),
Padding(
padding: const EdgeInsets.all(16.0),
child: _buildPaymentButton(),
),
],
),
),
);
}
#override
Widget build(BuildContext context) {
return Container(
color: Colors.grey[50],
child: _dueDetail == null
? Center(
child: CircularProgressIndicator(),
)
: Column(
children: <Widget>[
Expanded(
child: Container(
width: MediaQuery.of(context).size.width,
child: SingleChildScrollView(
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
// PaymentSearchFilter(),
MyAccountInfoHeader(
dueDetail: _dueDetail,
),
MyOnlinePayOption(
dueDetail: _dueDetail,
),
isNotDueFound
? MyErrorData(
errorMsg: "No dues found",
subtitle: "No payable fees available",
)
: _dueDetail.getPayAmtFrom == 'FA'
? _buildFAbody()
: ListView.builder(
controller: _scrollController,
shrinkWrap: true,
physics: ClampingScrollPhysics(),
itemCount:
_dueDetail.payableFeeDetails.length.compareTo(0),
itemBuilder:
(BuildContext context, int index) {
final PayableFee _fee =
_dueDetail.payableFeeDetails[index];
return PayableTile(
payableFee: _fee,
isEditable:
_dueDetail.getPolicyValue == "P",
onChanged: () {
_onPayableTap(index);
},
isSelected: _currentIndex == index,
onBottomAction: (String action) {
if (action == 'EDIT')
_onEditPayableFee(index, _fee);
else if (action == 'DELETE')
_onRemovePayableFee(index, _fee);
else
_onAddPayableFee(index, _fee);
},
);
}),
],
),
),
),
),
isNotDueFound || _dueDetail.getPayAmtFrom == 'FA'
? Container()
: Align(
alignment: Alignment.bottomCenter,
child: Container(
decoration: BoxDecoration(
color: Colors.blue[50],
borderRadius: BorderRadius.only(
topLeft: Radius.circular(12),
topRight: Radius.circular(12.0))),
// padding: EdgeInsets.symmetric(horizontal: 12.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
_buildTotalAmount(),
_buildPaymentButton(),
],
),
),
)
],
),
);
}
}
RangeError (index): Invalid value: Valid value range is empty: 0
This error is coming when I try to press a button to open this page. How to fix it please help. It's taking too much of my time... Please help me out solving this.
Most probably it is a ListView problem or something... Check it out, please. I am fetching data from
API here on the page & doing some calculations.