I am trying to get the double value from JSON and i am getting this error. Please help me how to resolve this issue. I have no idea where i am messed up.
Below is my Error:
AsyncSnapshot<List>(ConnectionState.done, null, type 'String' is not a subtype of type 'double', #0 new Product.fromMap (package:purple_star/screens/Model/product_model.dart:48:18) fetchProduct. (package:purple_star/screens/Services/product_services.dart:13:50) MappedListIterable.elementAt (dart:_internal/iterable.dart:413:31) ListIterator.moveNext (dart:_internal/iterable.dart:342:26) new _GrowableList._ofEfficientLengthIterable (dart:core-patch/growable_array.dart:188:27) new _GrowableList.of (dart:core-patch/growable_array.dart:150:28) new List.of (dart:core-patch/array_patch.dart:50:28) ListIterable.toList (dart:_internal/iterable.dart:213:44) fetchProduct (package:purple_star/screens/Services/product_services.dart:13:65)
class Product {
Product({
required this.productId,
required this.title,
required this.made,
required this.productImageUrl,
required this.strains,
required this.price,
required this.productType,
});
final int productId;
final String title;
final String made;
final String productImageUrl;
final String strains;
final double price;
ProductType productType;
factory Product.fromMap(Map<String, dynamic> json)
=> Product(
productId: json["productId"] as int,
title: json["title"] as String,
made: json["made"] as String,
productImageUrl: json["productImageUrl"] as String,
strains: json["strains"] as String,
price: json["price"] as double,
productType: ProductType.fromJson(json["productType"]));
}
Future<List<Product>> fetchProduct() async {
var URL = Uri.parse('https://mocki.io/v1/74d9dc9d-e33a-4fd3-b358-328d07be6aed');
final response = await http.get(URL);
if (response.statusCode == 200) {
final parsed = json.decode(response.body).cast<Map<String, dynamic>>();
print(parsed);
return parsed.map<Product>((json) => Product.fromMap(json)).toList();
} else {
throw Exception('Failed to load Products');
}
}
Thanks in advance.
CodePudding user response:
Try below code hope its help to you.
double.tryParse(json['price']),
Or try below answer
Your API call:
Future<List<dynamic>> getInfoData() async {
String url = 'https://mocki.io/v1/74d9dc9d-e33a-4fd3-b358-328d07be6aed';
var response = await http.get(Uri.parse(url), headers: {
'Content-Type': 'application/json',
'Accept': 'application/json',
});
return json.decode(response.body);
}
Your Widget:
Expanded(
child: FutureBuilder<List<dynamic>>(
future: getInfoData(),
builder: (context, snapshot) {
if (snapshot.hasData) {
return Padding(
padding: const EdgeInsets.all(8.0),
child: ListView.builder(
shrinkWrap: true,
itemCount: snapshot.data!.length,
itemBuilder: (context, index) {
var name = snapshot.data![index]['title'];
var price = snapshot.data![index]['price'];
var productImageUrl =
snapshot.data![index]['productImageUrl'];
var made = snapshot.data![index]['made'];
var type1 =
snapshot.data![index]['productType']['type1'];
var type2 =
snapshot.data![index]['productType']['type2'];
var type3 =
snapshot.data![index]['productType']['type3'];
return Card(
shape: RoundedRectangleBorder(
side: BorderSide(color: Colors.green.shade300),
borderRadius: BorderRadius.circular(15.0),
),
child: ListTile(
title: Text(name),
subtitle: Text(
made '\n' type1 '\n' type2 '\n' type3,
),
leading: Image.network(productImageUrl),
trailing: Text(price.toString()),
),
);
},
),
);
}
return Center(
child: const CircularProgressIndicator(),
);
},
),
),
CodePudding user response:
in your JSON file, the type of "price" is String
not double
. try to replace price: json["price"] as double
with double.tryParse(json["price"])