[英]Flutter Invalid value: Valid value range is empty: 0
I am trying to fetch data from API and store the data in a list so that I can use the listin my code but it gives an error of Invalid value: Valid value range is empty: 0我正在尝试从 API 获取数据并将数据存储在列表中,以便我可以在我的代码中使用该列表,但它给出了无效值错误:有效值范围为空:0
Below is the code下面是代码
class Services {
final String apiKey = '*Hidden*';
static const int numberOfFood = 50;
List<String> foodNameList = [];
getRandomBreakfast() async {
http.Response response = await http.get(
Uri.parse(
'https://api.spoonacular.com/recipes/random?apiKey=$apiKey&number=$numberOfFood&tags=breakfast?'),
);
dynamic foodData = response.body;
Map data = json.decode(foodData);
for (int i = 0; i < numberOfFood; i++) {
String foodName = (data['recipes'][i]['title']);
foodNameList.add(foodName);
}
}
}
I want to use it in the below GridView builder我想在下面的 GridView builder 中使用它
GridView.builder(
itemCount: Services.numberOfFood,
gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 2,
crossAxisSpacing: 10,
childAspectRatio: 0.7,
),
itemBuilder: (context, index) {
return FoodContainer(
foodLabel: Services().foodNameList[index]);
},
),
Maybe your data is empty, try this:也许你的数据是空的,试试这个:
for (int i = 0; i < numberOfFood; i++) {
if ((data['recipes'] as List).isNotEmpty) {
String foodName = (data['recipes'][i]['title']);
foodNameList.add(foodName);
} else {
print('Empty')
}
}
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