Getting type 'int' is not a subtype of 'double' error in Flutter
Question
In my electric_guitars_screen.dart file, I am getting type 'int' is not a subtype of 'double' error
I have taken relevant steps by either casting double variables to int or declared them as int itself.
Initially I thought that the divisions property of the RangeSlider was causing this error when I had cast it to.round() or.toInt(). I changed its value to a hardcoded integer.
However, I am still getting this error.
My Code
//import 'dart:html';
import 'package:flutter/material.dart';
import 'package:flutter_staggered_animations/flutter_staggered_animations.dart';
import 'package:musicart/widgets/text_label.dart';
import '../global_variables/global_variables.dart';
import '../widgets/animated_bottom_bar.dart';
import '../widgets/custom_appbar.dart';
import '../widgets/instrument_card.dart';
import 'instrument_detail.dart';
class ElectricGuitarsScreen extends StatefulWidget {
const ElectricGuitarsScreen({Key? key}) : super(key: key);
@override
State<ElectricGuitarsScreen> createState() => _ElectricGuitarsScreenState();
}
List<Map<String, dynamic>> guitarList = [];
List<Map<String, dynamic>> filteredGuitars = [];
//List<Map<String, dynamic>> filteredGuitars2 = [];
List<Map<String, dynamic>> filteredGuitarsByBrands = [];
//List<Map<String, dynamic>> filteredGuitarsByPrice = [];
List<String> guitarBrandList = [];
List<String> selectedBrands = [];
String sortCriterion = "relevance";
void populateGuitarList() {
guitarList.clear();
for (int i = 0; i < instruments.length; i++) {
if (instruments[i]["instrument"].toString().toLowerCase() == "guitar") {
guitarList.add(instruments[i]);
}
}
}
void populateGuitarBrandList() {
guitarBrandList.clear();
for (int i = 0; i < guitarList.length; i++) {
guitarBrandList.add(guitarList[i]["brand"]);
}
guitarBrandList = guitarBrandList.toSet().toList();
}
double minGuitarPrice = 10000000.0;
double maxGuitarPrice = -1.0;
void findMinPrice() {
for (int i = 0; i < guitarList.length; i++) {
if (guitarList[i]["price"] < minGuitarPrice) {
minGuitarPrice = guitarList[i]["price"];
}
}
}
void findMaxPrice() {
for (int i = 0; i < guitarList.length; i++) {
if (guitarList[i]["price"] > maxGuitarPrice) {
maxGuitarPrice = guitarList[i]["price"];
}
}
}
double minSearchPrice = minGuitarPrice;
double maxSearchPrice = maxGuitarPrice;
class _ElectricGuitarsScreenState extends State<ElectricGuitarsScreen> {
final TextEditingController _searchBoxController = TextEditingController();
final String _hintText = "Search instruments...";
int _currentIndex = 1;
int count = 0;
bool isSortFilter = false;
RangeValues rv = RangeValues(0, 1000000);
double _animContWidth = 0.0;
double _animContHeight = 0.0;
void changeSearchPrice(double minsp, maxsp) {
setState(() {
minSearchPrice = minsp;
maxSearchPrice = maxsp;
populateGuitarList();
count++;
});
}
void populateFilteredGuitars(double minp, double maxp) {
filteredGuitars.clear();
filteredGuitarsByBrands.clear();
//filteredGuitarsByPrice.clear();
if (selectedBrands.isNotEmpty) {
for (int i = 0; i < guitarList.length; i++) {
for (int j = 0; j < selectedBrands.length; j++) {
if (guitarList[i]["brand"] == selectedBrands[j]) {
filteredGuitarsByBrands.add(guitarList[i]);
}
}
}
}
if (selectedBrands.isEmpty) {
for (int i = 0; i < guitarList.length; i++) {
if (guitarList[i]["price"] <= maxp && guitarList[i]["price"] >= minp) {
filteredGuitars.add(guitarList[i]);
}
}
} else {
filteredGuitars.clear();
for (int i = 0; i < filteredGuitarsByBrands.length; i++) {
if (filteredGuitarsByBrands[i]["price"] <= maxp &&
filteredGuitarsByBrands[i]["price"] >= minp) {
filteredGuitars.add(filteredGuitarsByBrands[i]);
}
}
}
}
@override
void initState() {
super.initState();
populateGuitarList();
findMinPrice();
findMaxPrice();
minSearchPrice = minGuitarPrice;
maxSearchPrice = maxGuitarPrice;
rv = RangeValues(minSearchPrice, maxSearchPrice);
sortCriterion = "relevance";
//guitarList.sort((a, b) => a["brand"].compareTo(b["brand"]));
populateFilteredGuitars(minSearchPrice, maxSearchPrice);
populateGuitarBrandList();
}
@override
Widget build(BuildContext context) {
double? screenWidth = MediaQuery.of(context).size.width;
double? screenHeight = MediaQuery.of(context).size.height;
return Scaffold(
body: Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.center,
children: [
CustomAppBar(
screenWidth: screenWidth,
screenHeight: screenHeight,
searchBoxController: _searchBoxController,
hintText: _hintText,
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Padding(
padding: EdgeInsets.only(left: screenWidth * 0.025),
child: TextLabel(
width: screenWidth * 0.125,
labelText: "Guitars",
fontSize: screenWidth * 0.025),
),
Padding(
padding: EdgeInsets.only(right: screenWidth * 0.025),
child: InkWell(
onTap: () {
setState(() {
if (!isSortFilter) {
_animContWidth = screenWidth * 0.95;
_animContHeight = screenHeight * 0.205;
} else {
_animContWidth = 0;
_animContHeight = 0;
}
isSortFilter = !isSortFilter;
});
},
child: Icon(
Icons.sort_rounded,
size: screenWidth * 0.05,
),
),
),
],
),
Padding(padding: EdgeInsets.only(top: screenHeight * 0.02)),
(isSortFilter)
? AnimatedContainer(
duration: const Duration(milliseconds: 375),
width: _animContWidth,
height: _animContHeight,
child: Column(
children: [
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Text(
"₹ $minGuitarPrice",
style: globalTextStyle.copyWith(
color: primaryColor,
fontSize: screenWidth * 0.025,
fontWeight: FontWeight.bold,
),
),
SizedBox(
width: screenWidth * 0.7,
child: RangeSlider(
min: minGuitarPrice,
max: maxGuitarPrice,
divisions: 45000,
values: rv,
labels: RangeLabels(rv.start.round().toString(),
rv.end.round().toString()),
activeColor: primaryColor,
inactiveColor: Colors.grey,
onChanged: (values) {
setState(() {
rv = values;
populateFilteredGuitars(rv.start, rv.end);
count++;
});
},
),
),
Text(
"₹ $maxGuitarPrice",
style: globalTextStyle.copyWith(
color: primaryColor,
fontSize: screenWidth * 0.025,
fontWeight: FontWeight.bold,
),
),
],
),
Padding(
padding: EdgeInsets.only(top: screenHeight * 0.02)),
SizedBox(
height: screenHeight * 0.025,
width: screenWidth * 0.9,
child: Row(
mainAxisAlignment: MainAxisAlignment.start,
children: [
Expanded(
child: ListView.builder(
scrollDirection: Axis.horizontal,
itemCount: guitarBrandList.length,
itemBuilder:
(BuildContext context, int index) {
return Padding(
padding: EdgeInsets.only(
right: screenWidth * 0.02),
child: InkWell(
onTap: () {
if (!selectedBrands.contains(
guitarBrandList[index])) {
setState(() {
selectedBrands.add(
guitarBrandList[index]);
populateFilteredGuitars(
rv.start, rv.end);
count++;
});
} else {
setState(() {
selectedBrands.remove(
guitarBrandList[index]);
populateFilteredGuitars(
rv.start, rv.end);
count++;
});
}
},
child: Container(
width: screenWidth * 0.2,
decoration: BoxDecoration(
color: (!selectedBrands.contains(
guitarBrandList[index]))
? Colors.grey.shade200
: primaryColor,
borderRadius:
const BorderRadius.all(
Radius.circular(10)),
),
child: Center(
child: Text(
guitarBrandList[index],
style: globalTextStyle.copyWith(
color:
(!selectedBrands.contains(
guitarBrandList[
index]))
? primaryColor
: tertiaryColor,
fontSize: screenWidth * 0.02,
fontWeight: FontWeight.bold,
),
),
),
),
),
);
}))
],
),
),
Padding(
padding: EdgeInsets.only(top: screenHeight * 0.02)),
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
CustomRadioButton(
screenWidth: screenWidth,
value: "relevance",
groupValue: sortCriterion,
onChanged: (value) {
setState(() {
sortCriterion = value.toString();
guitarList.sort(
(a, b) => a["brand"].compareTo(b["brand"]));
populateFilteredGuitars(rv.start, rv.end);
count++;
});
},
text: "Relevance",
),
CustomRadioButton(
screenWidth: screenWidth,
value: "low to high",
groupValue: sortCriterion,
onChanged: (value) {
setState(() {
sortCriterion = value.toString();
guitarList.sort(
(a, b) => a["price"].compareTo(b["price"]));
populateFilteredGuitars(rv.start, rv.end);
count++;
});
},
text: "Low to High",
),
CustomRadioButton(
screenWidth: screenWidth,
value: "high to low",
groupValue: sortCriterion,
onChanged: (value) {
setState(() {
sortCriterion = value.toString();
guitarList.sort(
(a, b) => b["price"].compareTo(a["price"]));
populateFilteredGuitars(rv.start, rv.end);
count++;
});
},
text: "High to Low",
),
CustomRadioButton(
screenWidth: screenWidth,
value: "max discount",
groupValue: sortCriterion,
onChanged: (value) {
setState(() {
sortCriterion = value.toString();
guitarList.sort((a, b) =>
(a["price"] / a["mrp"])
.compareTo((b["price"] / b["mrp"])));
populateFilteredGuitars(rv.start, rv.end);
count++;
});
},
text: "Max Discount",
),
],
),
Padding(
padding: EdgeInsets.only(top: screenHeight * 0.02)),
Row(
mainAxisAlignment: MainAxisAlignment.end,
children: [
Padding(
padding:
EdgeInsets.only(right: screenWidth * 0.025),
child: InkWell(
onTap: () {
setState(() {
selectedBrands.clear();
rv = RangeValues(
minGuitarPrice, maxGuitarPrice);
populateFilteredGuitars(rv.start, rv.end);
count++;
});
},
child: Text(
"Clear filters",
style: globalTextStyle.copyWith(
color: primaryColor,
fontSize: screenWidth * 0.02,
fontWeight: FontWeight.bold,
decoration: TextDecoration.underline,
),
),
),
),
],
),
Padding(
padding: EdgeInsets.only(top: screenHeight * 0.02)),
],
),
)
: const SizedBox(),
SizedBox(
width: screenWidth,
height: (isSortFilter) ? screenHeight * 0.615 : screenHeight * 0.8,
child: Padding(
padding: EdgeInsets.symmetric(horizontal: screenWidth * 0.025),
child: Column(
children: [
Expanded(
child: AnimationLimiter(
key: ValueKey("list $count"),
child: GridView.count(
crossAxisCount: 2,
crossAxisSpacing: screenWidth * 0.01,
mainAxisSpacing: screenWidth * 0.01,
childAspectRatio: 0.75,
children:
List.generate(filteredGuitars.length, (index) {
return AnimationConfiguration.staggeredGrid(
position: index,
columnCount: 2,
duration: const Duration(milliseconds: 375),
child: SlideAnimation(
child: FadeInAnimation(
child: InstrumentCard(
width: (screenWidth * 0.47),
height: (screenWidth * 0.47) / 0.75,
instrumentImageUrl: filteredGuitars[index]
["img-url"],
instrumentName: filteredGuitars[index]
["name"],
instrumentMrp:
"₹${filteredGuitars[index]["mrp"].toString()}",
instrumentPrice:
"₹${filteredGuitars[index]["price"].toString()}",
paddingRight: 0,
innerHorizontalSymmetricPadding: 10,
innerVerticalSymmetricPadding: 0,
instrumentDiscount:
"${(((1 - (filteredGuitars[index]["price"] / filteredGuitars[index]["mrp"])) * 100).round()).toString()}% off",
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) =>
InstrumentDetail(
instrument:
filteredGuitars[
index])));
},
onWishTap: () {
if (wishList
.contains(filteredGuitars[index])) {
setState(() {
wishList
.remove(filteredGuitars[index]);
//count++;
});
} else {
setState(() {
wishList.add(filteredGuitars[index]);
});
}
},
onCartTap: () {
if (cartList.contains(
filteredGuitars[index]) ==
false) {
setState(() {
cartList.add(filteredGuitars[index]);
cartMap.addAll(
{filteredGuitars[index]: 1});
});
} else {
setState(() {
cartList
.remove(filteredGuitars[index]);
cartMap
.remove(filteredGuitars[index]);
});
}
},
isWishlisted: (wishList
.contains(filteredGuitars[index]))
? true
: false,
isCarted: (cartList
.contains(filteredGuitars[index]))
? true
: false,
instrument: filteredGuitars[index]),
),
),
);
}),
),
),
),
Padding(
padding:
EdgeInsets.symmetric(vertical: screenHeight * 0.025)),
],
),
),
),
],
),
bottomNavigationBar: Padding(
padding: EdgeInsets.symmetric(
horizontal: screenWidth * 0.025, vertical: screenHeight * 0.015),
child: CustomAnimatedBottomBar(
containerHeight: 56,
backgroundColor: Colors.black87,
selectedIndex: _currentIndex,
showElevation: true,
itemCornerRadius: 10,
curve: Curves.easeIn,
items: navBarItems,
onItemSelected: (index) {
setState(() {
_currentIndex = index;
});
},
),
),
);
}
}
What is causing this error in my code?
2 answers
solution1
1 ACCPTED 2022-08-11 13:06:18
Try this
void findMinPrice() {
for (int i = 0; i < guitarList.length; i++) {
if (guitarList[i]["price"] < minGuitarPrice) {
minGuitarPrice = (guitarList[i]["price"].toString.toDouble());
}
}
void findMaxPrice() {
for (int i = 0; i < guitarList.length; i++) {
if (guitarList[i]["price"] > maxGuitarPrice) {
maxGuitarPrice = (guitarList[i]["price"].toString.toDouble());
}
}
}
solution2
0 2022-08-11 11:41:58
There is one issue I've found from the provided snippet,
There will be runtime error while using RangeSlider
swap this value, Note this is not int issue, it is coming from others widget as I mentioned in the comment
double maxGuitarPrice = 10000000.0;
double minGuitarPrice = -1.0;
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