【发布时间】：2021-07-30 22:36:37
【问题描述】：
我对 Json 解析非常陌生。 我必须遍历 json 数组对象。
我的 JSON 类：
class Jsons {
static var hotelListJson = {
'hotelData': [
{
'index': 0,
'restaurantName': 'Monginis Cake Shop',
'foodCategory': 'The Cake Shop',
'restReview': 5,
'restImage': 'assets/images/Restaurant1.png',
'distanceFromLocation': 40,
'restStatus': 'open',
'menuCategories': [
{
'categoryName': 'Pastry',
'dishes': [
{
'dishName': 'Dutch Pastry',
'price': 5,
},
{
'dishName': 'Black Forest pastry',
'price': 50,
},
{
'dishName': 'Truffle Pastry',
'price': 35,
},
{
'dishName': 'Dutch Alond Veg',
'price': 50,
},
]
},
{
'categoryName': 'Breads',
'dishes': [
{
'dishName': 'Sandwich Bread',
'price': 5,
},
{
'dishName': 'Multigrain Bread',
'price': 50,
},
{
'dishName': 'Duth Chocolate Heart Veg (Small)',
'price': 35,
},
{
'dishName': 'Brown Bread',
'price': 50,
},
]
},
{
'categoryName': 'Savouries',
'dishes': [
{
'dishName': 'Panner pattice',
'price': 5,
},
{
'dishName': 'Veg Burger',
'price': 50,
},
{
'dishName': 'Pan Pizza Veg',
'price': 35,
},
{
'dishName': 'Veg pattice',
'price': 50,
},
]
},
]
},
{
'index': 1,
'restaurantName': 'Swami Hotel',
'foodCategory': 'Family Hotel',
'restReview': 2,
'restImage': 'assets/images/Restaurant2.png',
'distanceFromLocation': 40,
'restStatus': 'open',
'menuCategories': [
{
'categoryName': 'Veg Starter',
'dishes': [
{
'dishName': 'Paneer pahadi kabab',
'price': 5,
},
{
'dishName': 'Garlic chana',
'price': 50,
},
{
'dishName': 'Masala papad',
'price': 35,
},
{
'dishName': 'Manchurian',
'price': 50,
},
{
'dishName': 'Masroom chilli',
'price': 50,
},
]
},
{
'categoryName': 'Non Veg Starter',
'dishes': [
{
'dishName': 'CHI Chilli Gravy',
'price': 5,
},
{
'dishName': 'Lollypop Sezwan',
'price': 50,
},
{
'dishName': 'Pan Pizza Veg',
'price': 35,
},
{
'dishName': 'Chicken crispy',
'price': 50,
},
{
'dishName': 'Mandeli fry',
'price': 50,
},
]
},
{
'categoryName': 'Tandoori',
'dishes': [
{
'dishName': 'Chicken Tandoori',
'price': 5,
},
{
'dishName': 'Chicken Tangadi Kabab',
'price': 50,
},
{
'dishName': 'Chicken Pahadi Kabab',
'price': 35,
},
{
'dishName': 'Chicken Hydrabadi Kabab',
'price': 50,
},
{
'dishName': 'Mutton Kadhai',
'price': 50,
},
]
},
{
'categoryName': 'NON VEG SOUP',
'dishes': [
{
'dishName': 'Chi manchaow Soup',
'price': 5,
},
{
'dishName': 'Chi Clear Soup',
'price': 50,
},
{
'dishName': 'Chi Schezwan Soup',
'price': 35,
},
{
'dishName': 'Swami Special Chi Soup',
'price': 50,
},
]
},
{
'categoryName': 'VEG SOUP',
'dishes': [
{
'dishName': 'Chicken Masala',
'price': 5,
},
{
'dishName': 'Chicken Tikka Masala',
'price': 50,
},
{
'dishName': 'Chicken Handi',
'price': 35,
},
{
'dishName': 'Butter Chicken',
'price': 50,
},
{
'dishName': 'Mutton Kadhai',
'price': 50,
},
]
},
]
},
{
'index': 2,
'restaurantName': 'Smart open pick cake shop',
'foodCategory': 'Cake Shop',
'restReview': 1,
'restImage': 'assets/images/Restaurant4.png',
'distanceFromLocation': 10,
'restStatus': 'closed',
'offer': 'Get 5% discount',
'menuCategories': [
{
'categoryName': 'CAKE HALF Kg',
'dishes': [
{
'dishName': 'Black Forest',
'price': 300,
},
{
'dishName': 'Pineapple half kg',
'price': 50,
},
{
'dishName': 'Lichi half kg',
'price': 35,
},
{
'dishName': 'choco chips half kg',
'price': 50,
},
]
},
{
'categoryName': 'CAKE 1 KG',
'dishes': [
{
'dishName': 'Butterscotch',
'price': 5,
},
{
'dishName': 'Rose falooda',
'price': 50,
},
{
'dishName': 'White forest ovenpick',
'price': 35,
},
{
'dishName': 'Mix Fruit',
'price': 50,
},
]
},
]
},
{
'index': 3,
'restaurantName': 'Mitarth Chinese',
'foodCategory': 'Chinese corner',
'restReview': 3,
'restImage': 'assets/images/Restaurant5.png',
'distanceFromLocation': 20,
'restStatus': 'open',
},
{
'index': 4,
'restaurantName': 'Selfie Chat',
'foodCategory': 'Paani Puri & more',
'restReview': 2,
'restImage': 'assets/images/Restaurant6.png',
'distanceFromLocation': 40,
'restStatus': 'open',
},
{
'index': 5,
'restaurantName': 'Gareeb Nawaj Biryani',
'foodCategory': 'Caterers Biryani',
'restReview': 5,
'restImage': 'assets/images/Restaurant7.png',
'distanceFromLocation': 40,
'restStatus': 'open',
},
{
'index': 6,
'restaurantName': 'Prem Sweets',
'foodCategory': 'Sweets shop',
'restReview': 1,
'restImage': 'assets/images/Restaurant8.png',
'distanceFromLocation': 40,
'restStatus': 'closed',
'offer': 'Get 5% discount',
}
]
};
}
基本上我正在做的是 abc 是一家酒店的名称，并且其中填充了 abc 的子类别列表。subCategory 也有类型列表。
问题是该酒店下可能有很多类型。所以我需要一个合适的 Dart 循环结构，它可以通用来处理它。
我已经成功解析了主数组，但是我无法解析子类别和子类别下的类型。
这就是我的迭代方式：
@override
void initState() {
super.initState();
for (int i = 0; i < (Jsons.hotelListJson['hotelData'].length); i++) {
var currObj = Jsons.hotelListJson['hotelData'][i];
var currObjSubCategoryList =
currObj['menuCategories'] as List<Map<String, Object>>;
for (int j = 0; j < currObjSubCategoryList.length; j++) {
var listItem = currObjSubCategoryList[j];
var typeList = listItem['categoryName'] as List<Map<String, Object>>;
for (int k = 0; k < typeList.length; k++) {
var temp = typeList[k];
var currTypeName = temp['dishes'];
print(currTypeName);
restaurantListModel.add(RestaurantListModel(
currObj['restaurantName'],
currObj['foodCategory'],
currObj['restReview'],
currObj['restImage'],
currObj['distanceFromLocation'],
currObj['restStatus'],
));
}
}
}
}
这是我的模型类：
class RestaurantListModel {
var name,
category,
review,
offer;
final List<String> menuCategory;
RestaurantListModel(
this.restaurantName,
this.foodCategory,
this.restReview,
this.restImage,
this.distanceFromLocation,
this.restStatus,
this.menuCategory,
{this.offer});
}
我的容器：
Container(
//height: MediaQuery.of(context).size.height - 450,
child: NotificationListener<OverscrollIndicatorNotification>(
onNotification: (overscroll) {
overscroll.disallowGlow();
},
child: ListView.builder(
padding: EdgeInsets.only(
top: 10, bottom: 30, left: 15, right: 15),
controller: ScrollController(),
shrinkWrap: true,
itemCount: restaurantListModel.length,
itemBuilder: (context, index) {
return RestaurantCard(restaurantListModel, index,
restaurantListModel[index]);
}),
),
)
在 RestaurantCard 类中： 这就是我显示数据的方式：
Padding(
padding: const EdgeInsets.all(3.0),
child: Container(
alignment: Alignment.centerLeft,
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
widget.restaurantListModelObj.restaurantName,
style: commonTextStyle(
size: 2.4 * SizeConfig.textMultiplier,
whichFont: 'bold'),
),
Text(
widget.restaurantListModelObj.foodCategory,
style: commonTextStyle(
size: 2 * SizeConfig.textMultiplier,
),
)
],
),
),
),
请帮忙
提前致谢。
【问题讨论】：
-
如果 type 是一个列表，它有一个长度属性，你可以只做
hotelListJson[`myData`][i][`subCategory'][j]['type'][k]并且你可以使用map()function with 'type' array -
你能解释一下你的答案吗？