I/flutter (32524): type 'String' is not a subtype of type 'int' of 'index' - flutter

Question

I have this error ("type 'String' is not a sub type of type 'int' of 'index'")
but i don't know where the problem is or which line, the compiler don't tell me which line the error is,
here is the code:
main.dart
void main() async {
WidgetsFlutterBinding.ensureInitialized();
runApp(
MultiProvider(
providers: [
ChangeNotifierProvider<Auth>(
create: (_) =>
Auth(), //lezem nekten l auth abel l prodect li2an l prodect ya3tamed 3le
),
ChangeNotifierProxyProvider<Auth, Products>(
// 2 provider product ya3tamed 3ala auth
update: (ctx, value, previousProduct) => Products(value.token,
previousProduct==null? []: previousProduct.productsList),
),
],
child: MyApp(),
),
);
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Consumer<Auth>(
builder: (ctx, value, _) => MaterialApp(
theme: ThemeData(
primaryColor: Colors.orange,
canvasColor: Color.fromRGBO(255, 238, 219, 1)),
debugShowCheckedModeBanner: false,
home: value.isAuth? MyHomePage(): AuthScreen(),
),
);
}
}
class MyHomePage extends StatefulWidget {
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
bool _isLoading = true;
#override
void initState() {
Provider.of<Products>(context, listen: false)
.fetchData()
.then((_) => _isLoading = false)
.catchError((onError) => print(onError));
super.initState();
}
Widget detailCard(id, tile, desc, price, imageUrl) {
return Builder(
builder: (innerContext) => FlatButton(
onPressed: () {
print(id);
Navigator.push(
innerContext,
MaterialPageRoute(builder: (_) => ProductDetails(id)),
).then(
(id) => Provider.of<Products>(context, listen: false).delete(id));
},
child: Column(
children: [
SizedBox(height: 5),
Card(
elevation: 10,
color: Color.fromRGBO(115, 138, 119, 1),
child: Row(
children: <Widget>[
Expanded(
flex: 3,
child: Container(
padding: EdgeInsets.only(right: 10),
width: 130,
child: Hero(
tag: id,
child: Image.network(imageUrl, fit: BoxFit.fill),
),
),
),
Expanded(
flex: 3,
child: Column(
//mainAxisAlignment: MainAxisAlignment.spaceBetween,
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
SizedBox(height: 10),
Text(
tile,
style: TextStyle(
color: Colors.white,
fontSize: 20,
fontWeight: FontWeight.bold),
),
Divider(color: Colors.white),
Container(
width: 200,
child: Text(
desc,
style: TextStyle(color: Colors.white, fontSize: 14),
softWrap: true,
overflow: TextOverflow.fade,
textAlign: TextAlign.justify,
maxLines: 3,
),
),
Divider(color: Colors.white),
Text(
"\$$price",
style: TextStyle(color: Colors.black, fontSize: 18),
),
SizedBox(height: 13),
],
),
),
Expanded(flex: 1, child: Icon(Icons.arrow_forward_ios)),
],
),
),
],
),
),
);
}
#override
Widget build(BuildContext context) {
List<Product> prodList =
Provider.of<Products>(context, listen: true).productsList;
return Scaffold(
appBar: AppBar(title: Text('My Products')),
body: _isLoading
? Center(child: CircularProgressIndicator())
: (prodList.isEmpty
? Center(
child: Text('No Products Added.',
style: TextStyle(fontSize: 22)))
: RefreshIndicator(
onRefresh: () async =>
await Provider.of<Products>(context, listen: false)
.fetchData(),
child: ListView(
children: prodList
.map(
(item) => detailCard(item.id, item.title,
item.description, item.price, item.imageUrl),
)
.toList(),
),
)),
floatingActionButton: Container(
width: 180,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(20.0),
color: Theme.of(context).primaryColor,
),
child: FlatButton.icon(
label: Text("Add Product",
style: TextStyle(fontWeight: FontWeight.bold, fontSize: 19)),
icon: Icon(Icons.add),
onPressed: () => Navigator.push(
context, MaterialPageRoute(builder: (_) => AddProduct())),
),
),
);
}
}
product.dart
class Product {
final String id;
final String title;
final String description;
final double price;
final String imageUrl;
Product({
#required this.id,
#required this.title,
#required this.description,
#required this.price,
#required this.imageUrl,
});
}
class Products with ChangeNotifier {
List<Product> productsList = [];
final String authToken;
Products(this.authToken, this.productsList);
Future<void> fetchData() async {
final url = "https://flutter-app-568d3.firebaseio.com/product.json?auth=$authToken";
try {
final http.Response res = await http.get(url);
final extractedData = json.decode(res.body) as Map<String, dynamic>;
extractedData.forEach((prodId, prodData) {
final prodIndex =
productsList.indexWhere((element) => element.id == prodId);
if (prodIndex >= 0) {
productsList[prodIndex] = Product(
id: prodId,
title: prodData['title'],
description: prodData['description'],
price: prodData['price'],
imageUrl: prodData['imageUrl'],
);
} else {
productsList.add(Product(
id: prodId,
title: prodData['title'],
description: prodData['description'],
price: prodData['price'],
imageUrl: prodData['imageUrl'],
));
}
});
notifyListeners();
} catch (error) {
throw error;
}
}
Future<void> updateData(String id) async {
final url = "https://flutter-app-568d3.firebaseio.com/product/$id.json?auth=$authToken";
final prodIndex = productsList.indexWhere((element) => element.id == id);
if (prodIndex >= 0) {
await http.patch(url,
body: json.encode({
"title": "new title 4",
"description": "new description 2",
"price": 199.8,
"imageUrl":
"https://cdn.pixabay.com/photo/2015/06/19/21/24/the-road-815297__340.jpg",
}));
productsList[prodIndex] = Product(
id: id,
title: "new title 4",
description: "new description 2",
price: 199.8,
imageUrl:
"https://cdn.pixabay.com/photo/2015/06/19/21/24/the-road-815297__340.jpg",
);
notifyListeners();
} else {
print("...");
}
}
Future<void> add(
{String id,
String title,
String description,
double price,
String imageUrl}) async {
final url = "https://flutter-app-568d3.firebaseio.com/product.json?auth=$authToken";
try {
http.Response res = await http.post(url,
body: json.encode({
"title": title,
"description": description,
"price": price,
"imageUrl": imageUrl,
}));
print(json.decode(res.body));
productsList.add(Product(
id: json.decode(res.body)['name'],
title: title,
description: description,
price: price,
imageUrl: imageUrl,
));
notifyListeners();
} catch (error) {
throw error;
}
}
Future<void> delete(String id) async {
final url = "https://flutter-app-568d3.firebaseio.com/product/$id.json?auth=$authToken";
final prodIndex = productsList.indexWhere((element) => element.id == id);
var prodItem = productsList[prodIndex];
productsList.removeAt(prodIndex);
notifyListeners();
var res = await http.delete(url);
if (res.statusCode >= 400) {
productsList.insert(prodIndex, prodItem);
notifyListeners();
print("Could not deleted item");
} else {
prodItem = null;
print("Item deleted");
}
}
}
auth.dart
class Auth with ChangeNotifier {
String _token;
DateTime _expireDate;
String _userId;
bool get isAuth{
return token != null;
}
String get token{
if(_expireDate != null && _expireDate.isAfter(DateTime.now()) && _token != null){
return _token;
}return null;
}
Future<void> _authenticate(
String email, String password, String urlSegment) async {
final url =
"https://identitytoolkit.googleapis.com/v1/accounts:$urlSegment?key=AIzaSyAN1Z9ibJ9-HqBen65x5ALKiqsRTzFfhh8";
try {
final res = await http.post(url,
body: json.encode({
'email': email,
'password': password,
'returnSecureToken': true,
}));
print(json.decode(res.body));// byetba3 lma3lomat l rej3a ya3ni resalet l error
final resData = json.decode(res.body);
// to print the error
if(resData['error'] != null){
throw "${resData['error']['message']}";
}
_token = resData['idToken'];
_userId = resData['localId'];
_expireDate = DateTime.now().add(Duration(seconds: int.parse(resData['expiresIn'])));
notifyListeners();
} catch (e) {
throw e;
}
}
Future<void> signUp(String email, String password) async {
return _authenticate(email, password, "signUp");
}
Future<void> login(String email, String password) async {
return _authenticate(email, password, "signInWithPassword");
}
}
auth_screen.dart
enum AuthMode { SignUp, Login }
class AuthScreen extends StatelessWidget {
static const routeName = '/auth';
#override
Widget build(BuildContext context) {
final deviceSize = MediaQuery.of(context).size;
return Scaffold(
// resizeToAvoidBottomInset: false,
body: Stack(
children: <Widget>[
Container(
decoration: BoxDecoration(
gradient: LinearGradient(
colors: [
Color.fromRGBO(215, 117, 255, 1).withOpacity(0.5),
Color.fromRGBO(255, 188, 117, 1).withOpacity(0.9),
],
begin: Alignment.topLeft,
end: Alignment.bottomRight,
stops: [0, 1],
),
),
),
SingleChildScrollView(
child: Container(
height: deviceSize.height,
width: deviceSize.width,
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Flexible(
child: Container(
margin: EdgeInsets.only(bottom: 20.0),
padding:
EdgeInsets.symmetric(vertical: 8.0, horizontal: 94.0),
transform: Matrix4.rotationZ(-8 * pi / 180)
..translate(-10.0),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(20),
color: Colors.deepOrange.shade900,
boxShadow: [
BoxShadow(
blurRadius: 8,
color: Colors.black26,
offset: Offset(0, 2),
)
],
),
child: Text(
'MyShop',
style: TextStyle(
color: Colors.white,
fontSize: 40,
),
),
),
),
Flexible(
flex: deviceSize.width > 600 ? 2 : 1,
child: AuthCard(),
),
],
),
),
),
],
),
);
}
}
class AuthCard extends StatefulWidget {
const AuthCard({
Key key,
}) : super(key: key);
#override
_AuthCardState createState() => _AuthCardState();
}
class _AuthCardState extends State<AuthCard> {
final GlobalKey<FormState> _formKey = GlobalKey();
AuthMode _authMode = AuthMode.Login;
Map<String, String> _authData = {
'email': '',
'password': '',
};
var _isLoading = false;
final _passwordController = TextEditingController();
void _showErrorDialog(String message) {
showDialog(
context: context,
builder: (ctx) => AlertDialog(
title: Text("An Error Occurred"),
content: Text(message),
actions: <Widget>[
FlatButton(
onPressed: () {
Navigator.of(ctx).pop();
},
child: Text("OK")),
],
));
}
Future<void> _submit() async{
if (!_formKey.currentState.validate()) {
// Invalid!
return;
}
_formKey.currentState.save();
setState(() {
_isLoading = true;
});
try {
if (_authMode == AuthMode.Login) {
// Log user in
await Provider.of<Auth>(context, listen: false)
.login(
_authData['email'],
_authData['password'],
);
} else {
// Sign user up
await Provider.of<Auth>(context, listen: false)
.signUp(
_authData['email'],
_authData['password'],
);
}
} catch (error) {
var errorMessage = "Authentication failed";
if(error.toString().contains('EMAIL_EXISTS')){
errorMessage = 'This email address is already taken';
}else if(error.toString().contains('INVALID_EMAIL')){
errorMessage = 'This is not a valid email address';
}else if(error.toString().contains('WEAK_PASSWORD')){
errorMessage = 'This password is too weak';
} else if(error.toString().contains('EMAIL_NOT_FOUND')){
errorMessage = 'Could not find a user with that email';
} else if(error.toString().contains('INVALID_PASSWORD')){
errorMessage = 'Invalid password';
}
_showErrorDialog(errorMessage);
}
setState(() {
_isLoading = false;
});
}
void _switchAuthMode() {
if (_authMode == AuthMode.Login) {
setState(() {
_authMode = AuthMode.SignUp;
});
} else {
setState(() {
_authMode = AuthMode.Login;
});
}
}
#override
Widget build(BuildContext context) {
final deviceSize = MediaQuery.of(context).size;
return Card(
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(10.0),
),
elevation: 8.0,
child: Container(
height: _authMode == AuthMode.SignUp ? 320 : 260,
constraints:
BoxConstraints(minHeight: _authMode == AuthMode.SignUp ? 320 : 260),
width: deviceSize.width * 0.75,
padding: EdgeInsets.all(16.0),
child: Form(
key: _formKey,
child: SingleChildScrollView(
child: Column(
children: <Widget>[
TextFormField(
decoration: InputDecoration(labelText: 'E-Mail'),
keyboardType: TextInputType.emailAddress,
validator: (value) {
if (value.isEmpty || !value.contains('#')) {
return 'Invalid email!';
}
return null;
},
onSaved: (value) {
_authData['email'] = value;
},
),
TextFormField(
decoration: InputDecoration(labelText: 'Password'),
obscureText: true,
controller: _passwordController,
validator: (value) {
if (value.isEmpty || value.length < 5) {
return 'Password is too short!';
}
return null;
},
onSaved: (value) {
_authData['password'] = value;
},
),
if (_authMode == AuthMode.SignUp)
TextFormField(
enabled: _authMode == AuthMode.SignUp,
decoration: InputDecoration(labelText: 'Confirm Password'),
obscureText: true,
validator: _authMode == AuthMode.SignUp
? (value) {
if (value != _passwordController.text) {
return 'Passwords do not match!';
}
return null;
}
: null,
),
SizedBox(
height: 20,
),
if (_isLoading)
CircularProgressIndicator()
else
RaisedButton(
child:
Text(_authMode == AuthMode.Login ? 'LOGIN' : 'SIGN UP'),
onPressed: _submit,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(30),
),
padding:
EdgeInsets.symmetric(horizontal: 30.0, vertical: 8.0),
color: Theme.of(context).primaryColor,
textColor: Theme.of(context).primaryTextTheme.button.color,
),
FlatButton(
child: Text(
'${_authMode == AuthMode.Login ? 'SIGN UP' : 'LOGIN'} INSTEAD'),
onPressed: _switchAuthMode,
padding: EdgeInsets.symmetric(horizontal: 30.0, vertical: 4),
materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
textColor: Theme.of(context).primaryColor,
),
],
),
),
),
),
);
}
}
Compiler
Launching lib\main.dart on SM G610F in debug mode...
Running Gradle task 'assembleDebug'...
√ Built build\app\outputs\flutter-apk\app-debug.apk.
Installing build\app\outputs\flutter-apk\app.apk...
Waiting for SM G610F to report its views...
Debug service listening on ws://127.0.0.1:60889/J5CQX-fKfbs=/ws
Syncing files to device SM G610F...
I/zygote (32524): Do partial code cache collection, code=30KB, data=25KB
I/zygote (32524): After code cache collection, code=30KB, data=25KB
I/zygote (32524): Increasing code cache capacity to 128KB
D/libGLESv2(32524): STS_GLApi : DTS, ODTC are not allowed for Package : com.example.animation
D/ViewRootImpl#886418b[MainActivity](32524): ViewPostIme pointer 0
D/ViewRootImpl#886418b[MainActivity](32524): ViewPostIme pointer 1
D/InputMethodManager(32524): SSI - flag : 0 Pid : 32524 view : com.example.animation
V/InputMethodManager(32524): Starting input: tba=android.view.inputmethod.EditorInfo#9dca947 nm : com.example.animation ic=io.flutter.plugin.editing.InputConnectionAdaptor#271e574
D/InputMethodManager(32524): startInputInner - Id : 0
I/InputMethodManager(32524): startInputInner - mService.startInputOrWindowGainedFocus
D/InputTransport(32524): Input channel constructed: fd=100
D/InputTransport(32524): Input channel destroyed: fd=91
D/ViewRootImpl#886418b[MainActivity](32524): MSG_RESIZED: frame=Rect(0, 0 - 1080, 1920) ci=Rect(0, 72 - 0, 873) vi=Rect(0, 72 - 0, 873) or=1
D/ViewRootImpl#886418b[MainActivity](32524): Relayout returned: old=[0,0][1080,1920] new=[0,0][1080,1920] result=0x1 surface={valid=true 3430410240} changed=false
D/ViewRootImpl#886418b[MainActivity](32524): ViewPostIme pointer 0
D/ViewRootImpl#886418b[MainActivity](32524): ViewPostIme pointer 1
D/ViewRootImpl#886418b[MainActivity](32524): ViewPostIme pointer 0
I/zygote (32524): Do partial code cache collection, code=61KB, data=61KB
I/zygote (32524): After code cache collection, code=61KB, data=61KB
I/zygote (32524): Increasing code cache capacity to 256KB
D/ViewRootImpl#886418b[MainActivity](32524): ViewPostIme pointer 1
V/InputMethodManager(32524): Starting input: tba=android.view.inputmethod.EditorInfo#fb092e3 nm : com.example.animation ic=io.flutter.plugin.editing.InputConnectionAdaptor#981e4e0
D/InputMethodManager(32524): startInputInner - Id : 0
I/InputMethodManager(32524): startInputInner - mService.startInputOrWindowGainedFocus
D/InputTransport(32524): Input channel constructed: fd=94
D/InputTransport(32524): Input channel destroyed: fd=100
W/IInputConnectionWrapper(32524): getExtractedText on inactive InputConnection
D/ViewRootImpl#886418b[MainActivity](32524): ViewPostIme pointer 0
D/ViewRootImpl#886418b[MainActivity](32524): ViewPostIme pointer 1
D/InputMethodManager(32524): SSI - flag : 0 Pid : 32524 view : com.example.animation
V/InputMethodManager(32524): Starting input: tba=android.view.inputmethod.EditorInfo#391b65e nm : com.example.animation ic=io.flutter.plugin.editing.InputConnectionAdaptor#54f7a3f
D/InputMethodManager(32524): startInputInner - Id : 0
I/InputMethodManager(32524): startInputInner - mService.startInputOrWindowGainedFocus
D/InputTransport(32524): Input channel constructed: fd=97
D/InputTransport(32524): Input channel destroyed: fd=94
D/InputMethodManager(32524): HSIFW - flag : 0 Pid : 32524
D/ViewRootImpl#886418b[MainActivity](32524): MSG_RESIZED: frame=Rect(0, 0 - 1080, 1920) ci=Rect(0, 72 - 0, 0) vi=Rect(0, 72 - 0, 0) or=1
D/ViewRootImpl#886418b[MainActivity](32524): Relayout returned: old=[0,0][1080,1920] new=[0,0][1080,1920] result=0x1 surface={valid=true 3430410240} changed=false
D/ViewRootImpl#886418b[MainActivity](32524): ViewPostIme pointer 0
D/ViewRootImpl#886418b[MainActivity](32524): ViewPostIme pointer 1
I/flutter (32524): {kind: identitytoolkit#VerifyPasswordResponse, localId: urJPn2l2EBeHNGJ7MmcMMkCIJtf1, email: ali#gmail.com, displayName: , idToken: eyJhbGciOiJSUzI1NiIsImtpZCI6ImM0ZWFhZjkxM2VlNWY0MDY0YmE2NjUzN2M0Njk3YzY5OGE3NGYwODIiLCJ0eXAiOiJKV1QifQ.eyJpc3MiOiJodHRwczovL3NlY3VyZXRva2VuLmdvb2dsZS5jb20vZmx1dHRlci1hcHAtYjM0ZTAiLCJhdWQiOiJmbHV0dGVyLWFwcC1iMzRlMCIsImF1dGhfdGltZSI6MTYxNDg4MzQwMywidXNlcl9pZCI6InVySlBuMmwyRUJlSE5HSjdNbWNNTWtDSUp0ZjEiLCJzdWIiOiJ1ckpQbjJsMkVCZUhOR0o3TW1jTU1rQ0lKdGYxIiwiaWF0IjoxNjE0ODgzNDAzLCJleHAiOjE2MTQ4ODcwMDMsImVtYWlsIjoiYWxpQGdtYWlsLmNvbSIsImVtYWlsX3ZlcmlmaWVkIjpmYWxzZSwiZmlyZWJhc2UiOnsiaWRlbnRpdGllcyI6eyJlbWFpbCI6WyJhbGlAZ21haWwuY29tIl19LCJzaWduX2luX3Byb3ZpZGVyIjoicGFzc3dvcmQifX0.XfeiI4-UqDcaugW1mQxaoQbrk-h_NclPANgKKt0w36H6Jj32mGdUV-pZ_WdXdfMRxnF9lJEt9nfe0FgQSVKyYk8oLxkEaqlNJME1BnF5wUvHEJsqpHsG89mFz77cYWw-jYcjvquvPlJYSiwIc-snEyinRPx5DZwpbIkWtGe-oqWzJyE23C5inh0yu0O52tLrEDtBHy5m9qBvCK-3HLHKJ1Phrz0Q06qdH8cxw_3-AdRPqZQ8w8F4FhVOyrB04NEqWIBs-uvjAkbjo6y3LlM5PqLebrhDSdKlUlbVYOVPotMp0UMkcDRqkuZDlFZoMRoU
D/ViewRootImpl#886418b[MainActivity](32524): Relayout returned: old=[0,0][1080,1920] new=[0,0][1080,1920] result=0x1 surface={valid=true 3430410240} changed=false
I/flutter (32524): type 'String' is not a subtype of type 'int' of 'index'
D/ViewRootImpl#886418b[MainActivity](32524): MSG_WINDOW_FOCUS_CHANGED 0
D/ViewRootImpl#886418b[MainActivity](32524): MSG_WINDOW_FOCUS_CHANGED 1
I need a help please:
what i need to know is where is the error and how to solve it.
thank you in advance