问题：
颤振列表不是“Iterable”类型的子类型
金慈
我是颤振开发方面的新手。我犯了一个错误
列表不是“Iterable”类型的子类型
到目前为止，我已经做到了。
模范班
class Categories {
final String title;
final Items items;
Categories({this.title, this.items});
factory Categories.fromJson(Map<String, dynamic> json) {
return new Categories(
title: json['title'],
items: Items.fromJson(json['Items']));
}
}
class Items {
final String tag;
final String childId;
final String category;
final String isNew;
Items({this.tag, this.childId, this.category, this.isNew});
factory Items.fromJson(Map<String, dynamic> json) {
return new Items(
tag: json['id'],
childId: json['child_category_id'],
category: json['category'],
isNew: json['new']);
}}
缅因州班内
List<Categories> categories = [];
var loading = false;
Future<Null> getNavigationItems() async {
setState(() {
loading = true;
});
final response = await http.get(Uri.encodeFull(APIs.url_getCategory2));
if (response.statusCode == 200) {
final data = jsonDecode(utf8.decode(response.bodyBytes));
setState(() {
for(Map i in data){
categories.add(Categories.fromJson(i));
}
loading = false;
});
}
}
我试图从2天开始解决这个问题。
请帮忙，谢谢。
这里是JSON响应，您可以检查链接
共有3个答案
孟泽宇
只需查看修改后的代码，我已经基于动态JSON对象创建了一个列表。
{
"icons": {
"homeIcon": "https:\/\/www.woodenstreet.com\/images\/mobileapp\/drawericon\/home.png",
"cusomIcon": "https:\/\/www.woodenstreet.com\/images\/mobileapp\/drawericon\/custom.png",
"looks": "https:\/\/www.woodenstreet.com\/images\/mobileapp\/drawericon\/look-book.png",
"policyIcon": "https:\/\/www.woodenstreet.com\/images\/mobileapp\/drawericon\/privacy-policy.png",
"interiorIcon": "https:\/\/www.woodenstreet.com\/images\/mobileapp\/drawericon\/interior.png",
"emailIcon": "https:\/\/www.woodenstreet.com\/images\/mobileapp\/drawericon\/newsletter.png",
"aboutusIcon": "https:\/\/www.woodenstreet.com\/images\/mobileapp\/drawericon\/about-us.png"
},
"categories": {
"SOFAS": {
"icon": "https:\/\/www.woodenstreet.com\/images\/mobileapp\/drawericon\/sofa.png",
"Items": [{
"tag": "parent",
"child_category_id": "10",
"category": "SOFA SETS",
"new": "0"
}, {
"tag": "child",
"child_category_id": "11",
"category": "Fabric Sofas",
"new": "1"
}, {
"tag": "child",
"child_category_id": "12",
"category": "Wooden Sofas",
"new": "1"
}, {
"tag": "child",
"child_category_id": "298",
"category": "3 Seater Sofas",
"new": "0"
}, {
"tag": "child",
"child_category_id": "299",
"category": "2 Seater Sofas",
"new": "0",
"icon": ""
}, {
"tag": "child",
"child_category_id": "666",
"category": "L Shaped Corner Sofas",
"new": "0"
}, {
"tag": "child",
"child_category_id": "312",
"category": "Chesterfield Sofas",
"new": "0"
}, {
"tag": "child",
"child_category_id": "1079",
"category": "Recliners",
"new": "0"
}, {
"tag": "child",
"child_category_id": "120",
"category": "Futons",
"new": "0"
}, {
"tag": "parent",
"child_category_id": "13",
"category": "SOFA CUM BED",
"new": "0"
}, {
"tag": "child",
"child_category_id": "108",
"category": "Wooden Sofa Cum Beds",
"new": "1"
}, {
"tag": "child",
"child_category_id": "107",
"category": "Fabric Sofa Cum Beds",
"new": "0"
}, {
"tag": "child",
"child_category_id": "13",
"category": "Sofa Cum Beds",
"new": "0"
}, {
"tag": "parent",
"child_category_id": "",
"category": "SEATING",
"new": "0"
}, {
"tag": "child",
"child_category_id": "124",
"category": "Wingback Chairs",
"new": "1"
}, {
"tag": "child",
"child_category_id": "36",
"category": "Lounge Chairs",
"new": "0"
}, {
"tag": "child",
"child_category_id": "40",
"category": "Chaise Lounge",
"new": "0"
}, {
"tag": "child",
"child_category_id": "126",
"category": "Arm Chair",
"new": "0"
}, {
"tag": "child",
"child_category_id": "42",
"category": "Stools",
"new": "0"
}, {
"tag": "child",
"child_category_id": "116",
"category": "Divans",
"new": "1"
}, {
"tag": "child",
"child_category_id": "77",
"category": "Ottomans",
"new": "1"
}, {
"tag": "child",
"child_category_id": "118",
"category": "Loveseats",
"new": "1"
}]
},
"LIVING": {
"icon": "https:\/\/www.woodenstreet.com\/images\/mobileapp\/drawericon\/living.png",
"Items": [{
"tag": "parent",
"child_category_id": "16",
"category": "LIVING STORAGE",
"new": "0"
}, {
"tag": "child",
"child_category_id": "17",
"category": "TV Units",
"new": "1"
}, {
"tag": "child",
"child_category_id": "22",
"category": "Bookshelves",
"new": "0"
}, {
"tag": "child",
"child_category_id": "20",
"category": "Display Unit",
"new": "0"
}, {
"tag": "child",
"child_category_id": "19",
"category": "Shoe Racks",
"new": "1"
}, {
"tag": "child",
"child_category_id": "18",
"category": "Wall Shelves",
"new": "0"
}, {
"tag": "child",
"child_category_id": "21",
"category": "Prayer Units",
"new": "0"
}, {
"tag": "child",
"child_category_id": "23",
"category": "Magazine Racks",
"new": "0"
}, {
"tag": "parent",
"child_category_id": "24",
"category": "TABLES",
"new": "0"
}, {
"tag": "child",
"child_category_id": "25",
"category": "Coffee Tables",
"new": "1"
}, {
"tag": "child",
"child_category_id": "134",
"category": "Coffee Table Sets",
"new": "1"
}, {
"tag": "child",
"child_category_id": "27",
"category": "Nest of Tables",
"new": "0"
}, {
"tag": "child",
"child_category_id": "135",
"category": "Side & End Tables",
"new": "0"
}, {
"tag": "child",
"child_category_id": "26",
"category": "Console Table",
"new": "0"
}, {
"tag": "parent",
"child_category_id": "116",
"category": "DIVANS",
"new": "0"
}, {
"tag": "child",
"child_category_id": "116",
"category": "Divans",
"new": "0"
}, {
"tag": "parent",
"child_category_id": "38",
"category": "CHAIRS",
"new": "0"
}, {
"tag": "child",
"child_category_id": "36",
"category": "Lounge Chairs",
"new": "0"
}, {
"tag": "child",
"child_category_id": "124",
"category": "Wing Chairs",
"new": "0"
}, {
"tag": "child",
"child_category_id": "35",
"category": "Rocking Chairs",
"new": "0"
}, {
"tag": "child",
"child_category_id": "126",
"category": "Arm Chairs",
"new": "0"
}, {
"tag": "child",
"child_category_id": "130",
"category": "Metal Chairs",
"new": "0"
}, {
"tag": "child",
"child_category_id": "37",
"category": "Kids Chairs",
"new": "0"
}, {
"tag": "child",
"child_category_id": "42",
"category": "Stools",
"new": "0"
}, {
"tag": "child",
"child_category_id": "43",
"category": "Benches",
"new": "0"
}, {
"tag": "child",
"child_category_id": "122",
"category": "Bean Bags",
"new": "0"
}, {
"tag": "parent",
"child_category_id": "5",
"category": "OUTDOOR",
"new": "0"
}, {
"tag": "child",
"child_category_id": "98",
"category": "Garden Furniture",
"new": "0"
}, {
"tag": "child",
"child_category_id": "96",
"category": "Balcony Furniture",
"new": "0"
}, {
"tag": "child",
"child_category_id": "138",
"category": "Wooden Swings",
"new": "0"
}, {
"tag": "parent",
"child_category_id": "673",
"category": "OFFICE FURNITURE",
"new": "0"
}, {
"tag": "child",
"child_category_id": "681",
"category": "Office Tables",
"new": "0"
}, {
"tag": "child",
"child_category_id": "674",
"category": "Office Chairs",
"new": "0"
}]
},
"BEDROOM": {
"icon": "https:\/\/www.woodenstreet.com\/images\/mobileapp\/drawericon\/bedroom.png",
"Items": [{
"tag": "parent",
"child_category_id": "55",
"category": "BEDS",
"new": "0"
}, {
"tag": "child",
"child_category_id": "59",
"category": "Queen Size Beds",
"new": "0"
}, {
"tag": "child",
"child_category_id": "61",
"category": "King Size Beds",
"new": "0"
}, {
"tag": "child",
"child_category_id": "58",
"category": "Single Beds",
"new": "0"
}, {
"tag": "child",
"child_category_id": "149",
"category": "Hydraulic Storage Beds",
"new": "0"
}, {
"tag": "child",
"child_category_id": "150",
"category": "Upholstered Beds",
"new": "1"
}, {
"tag": "child",
"child_category_id": "13",
"category": "Sofa cum Beds",
"new": "0"
}, {
"tag": "child",
"child_category_id": "151",
"category": "Trundle Beds",
"new": "1"
}, {
"tag": "child",
"child_category_id": "60",
"category": "Double Beds",
"new": "0"
}, {
"tag": "child",
"child_category_id": "62",
"category": "Poster Beds",
"new": "0"
}, {
"tag": "child",
"child_category_id": "116",
"category": "Divan Beds",
"new": "0"
}, {
"tag": "parent",
"child_category_id": "65",
"category": "BEDROOM STORAGE & ACCESSORIES",
"new": "0"
}, {
"tag": "child",
"child_category_id": "67",
"category": "Bedside Table",
"new": "0"
}, {
"tag": "child",
"child_category_id": "101",
"category": "Chest of Drawers",
"new": "0"
}, {
"tag": "child",
"child_category_id": "91",
"category": "Wardrobes",
"new": "0"
}, {
"tag": "child",
"child_category_id": "68",
"category": "Dressing Table",
"new": "0"
}, {
"tag": "child",
"child_category_id": "154",
"category": "Trunk & Blanket Boxes",
"new": "0"
}, {
"tag": "child",
"child_category_id": "66",
"category": "Breakfast Table",
"new": "0"
}, {
"tag": "child",
"child_category_id": "18",
"category": "Wall Shelves",
"new": "0"
}, {
"tag": "child",
"child_category_id": "178",
"category": "Room Dividers",
"new": "0"
}, {
"tag": "parent",
"child_category_id": "74",
"category": "Mattress & Bedding",
"new": "0"
}, {
"tag": "child",
"child_category_id": "548",
"category": "Mattresses",
"new": "0"
}, {
"tag": "child",
"child_category_id": "549",
"category": "Single Bed Mattress",
"new": "0"
}, {
"tag": "child",
"child_category_id": "551",
"category": "Queen Size mattress",
"new": "0"
}, {
"tag": "child",
"child_category_id": "550",
"category": "King Size Mattress",
"new": "0"
}, {
"tag": "child",
"child_category_id": "552",
"category": "Double Bed Mattress",
"new": "0"
}, {
"tag": "parent",
"child_category_id": "155",
"category": "KIDS BEDROOM",
"new": "0"
}, {
"tag": "child",
"child_category_id": "64",
"category": "Bunk Beds",
"new": "0"
}, {
"tag": "child",
"child_category_id": "63",
"category": "Kids Beds",
"new": "0"
}, {
"tag": "child",
"child_category_id": "156",
"category": "Cribs",
"new": "0"
}, {
"tag": "child",
"child_category_id": "31",
"category": "Kids Study Table",
"new": "0"
}, {
"tag": "child",
"child_category_id": "37",
"category": "Kids Chairs",
"new": "0"
}]
},
"DINING": {
"icon": "https:\/\/www.woodenstreet.com\/images\/mobileapp\/drawericon\/dining.png",
"Items": [{
"tag": "parent",
"child_category_id": "44",
"category": "DINING ROOM FURNITURE",
"new": "0"
}, {
"tag": "child",
"child_category_id": "47",
"category": "6 Seater Dining Sets",
"new": "1"
}, {
"tag": "child",
"child_category_id": "46",
"category": "4 Seater Dining Sets",
"new": "0"
}, {
"tag": "child",
"child_category_id": "49",
"category": "2 Seater Dining Sets",
"new": "0"
}, {
"tag": "child",
"child_category_id": "51",
"category": "Extendable Dining Sets",
"new": "0"
}, {
"tag": "child",
"child_category_id": "143",
"category": "Round Dining Sets",
"new": "0"
}, {
"tag": "child",
"child_category_id": "48",
"category": "Dining Tables",
"new": "0"
}, {
"tag": "child",
"child_category_id": "141",
"category": "8 Seater Dining Sets",
"new": "1"
}, {
"tag": "child",
"child_category_id": "44",
"category": "Dining Table Sets",
"new": "0"
}, {
"tag": "parent",
"child_category_id": "383",
"category": "DINING CHAIRS",
"new": "0"
}, {
"tag": "child",
"child_category_id": "383",
"category": "Dining Chairs",
"new": "0"
}, {
"tag": "child",
"child_category_id": "43",
"category": "Benches",
"new": "0"
}, {
"tag": "parent",
"child_category_id": "11",
"category": "KITCHEN FURNITURE",
"new": "0"
}, {
"tag": "child",
"child_category_id": "54",
"category": "Cabinets & Sideboards",
"new": "0"
}, {
"tag": "child",
"child_category_id": "177",
"category": "Kitchen Cabinets",
"new": "1"
}, {
"tag": "child",
"child_category_id": "190",
"category": "Kitchen Trolley",
"new": "1"
}, {
"tag": "child",
"child_category_id": "517",
"category": "Kitchen Island",
"new": "1"
}, {
"tag": "child",
"child_category_id": "540",
"category": "Crockery Unit",
"new": "1"
}, {
"tag": "parent",
"child_category_id": "11",
"category": "BAR FURNITURE",
"new": "0"
}, {
"tag": "child",
"child_category_id": "53",
"category": "Bar Cabinets",
"new": "0"
}, {
"tag": "child",
"child_category_id": "147",
"category": "Bar Trolleys",
"new": "0"
}, {
"tag": "child",
"child_category_id": "148",
"category": "Wine Racks",
"new": "0"
}, {
"tag": "child",
"child_category_id": "41",
"category": "Bar Stools & Chairs",
"new": "0"
}]
},
"STORAGE": {
"icon": "https:\/\/www.woodenstreet.com\/images\/mobileapp\/drawericon\/stores.png",
"Items": [{
"tag": "parent",
"child_category_id": "16",
"category": "LIVING STORAGE",
"new": "0"
}, {
"tag": "child",
"child_category_id": "17",
"category": "TV Units",
"new": "1"
}, {
"tag": "child",
"child_category_id": "22",
"category": "Bookshelves",
"new": "1"
}, {
"tag": "child",
"child_category_id": "20",
"category": "Display Units",
"new": "0"
}, {
"tag": "child",
"child_category_id": "19",
"category": "Shoe Racks",
"new": "1"
}, {
"tag": "child",
"child_category_id": "18",
"category": "Wall Shelves",
"new": "0"
}, {
"tag": "child",
"child_category_id": "21",
"category": "Prayer Units",
"new": "0"
}, {
"tag": "child",
"child_category_id": "23",
"category": "Magazine Racks",
"new": "0"
}, {
"tag": "parent",
"child_category_id": "100",
"category": "BEDROOM STORAGE",
"new": "0"
}, {
"tag": "child",
"child_category_id": "101",
"category": "Chest of Drawers",
"new": "0"
}, {
"tag": "child",
"child_category_id": "91",
"category": "Wardrobes",
"new": "0"
}, {
"tag": "child",
"child_category_id": "67",
"category": "Bedside Tables",
"new": "0"
}, {
"tag": "child",
"child_category_id": "154",
"category": "Trunk & Blanket Boxes",
"new": "0"
}, {
"tag": "child",
"child_category_id": "66",
"category": "Breakfast Table",
"new": "0"
}, {
"tag": "child",
"child_category_id": "68",
"category": "Dressing Table",
"new": "0"
}, {
"tag": "child",
"child_category_id": "18",
"category": "Wall Shelves",
"new": "0"
}, {
"tag": "parent",
"child_category_id": "11",
"category": "DINING STORAGE",
"new": "0"
}, {
"tag": "child",
"child_category_id": "54",
"category": "Cabinets & Sideboards",
"new": "0"
}, {
"tag": "child",
"child_category_id": "177",
"category": "Kitchen Cabinets",
"new": "1"
}, {
"tag": "child",
"child_category_id": "190",
"category": "Kitchen Trolley",
"new": "1"
}, {
"tag": "child",
"child_category_id": "517",
"category": "Kitchen Island",
"new": "1"
}, {
"tag": "child",
"child_category_id": "540",
"category": "Crockery Unit",
"new": "1"
}, {
"tag": "child",
"child_category_id": "144",
"category": "Hutch Cabinets",
"new": "0"
}, {
"tag": "parent",
"child_category_id": "160",
"category": "BATHROOM STORAGE",
"new": "0"
}, {
"tag": "child",
"child_category_id": "112",
"category": "Bathroom Cabinets",
"new": "0"
}, {
"tag": "parent",
"child_category_id": "145",
"category": "BAR FURNITURE",
"new": "0"
}, {
"tag": "child",
"child_category_id": "53",
"category": "Bar Cabinets",
"new": "0"
}, {
"tag": "child",
"child_category_id": "147",
"category": "Bar Trolleys",
"new": "0"
}, {
"tag": "child",
"child_category_id": "148",
"category": "Wine Racks",
"new": "0"
}, {
"tag": "child",
"child_category_id": "41",
"category": "Bar Stools & Chairs",
"new": "0"
}]
},
"STUDY": {
"icon": "https:\/\/www.woodenstreet.com\/images\/mobileapp\/drawericon\/study.png",
"Items": [{
"tag": "parent",
"child_category_id": "24",
"category": "TABLES",
"new": "0"
}, {
"tag": "child",
"child_category_id": "29",
"category": "Study Tables",
"new": "0"
}, {
"tag": "child",
"child_category_id": "30",
"category": "Laptop Tables",
"new": "0"
}, {
"tag": "child",
"child_category_id": "31",
"category": "Kids Study Tables",
"new": "0"
}, {
"tag": "child",
"child_category_id": "32",
"category": "Computer Tables",
"new": "0"
}, {
"tag": "parent",
"child_category_id": "11",
"category": "CHAIRS",
"new": "0"
}, {
"tag": "child",
"child_category_id": "37",
"category": "Kids Study Chairs",
"new": "0"
}, {
"tag": "child",
"child_category_id": "159",
"category": "Study Chairs",
"new": "0"
}, {
"tag": "parent",
"child_category_id": "11",
"category": "STORAGE",
"new": "0"
}, {
"tag": "child",
"child_category_id": "18",
"category": "Wall Shelves",
"new": "0"
}, {
"tag": "child",
"child_category_id": "22",
"category": "Bookshelves",
"new": "0"
}, {
"tag": "child",
"child_category_id": "1078",
"category": "Table Organizer",
"new": "0"
}]
},
"KIDS FURNITURE": {
"icon": "https:\/\/www.woodenstreet.com\/images\/mobileapp\/drawericon\/kids.png",
"Items": [{
"tag": "parent",
"child_category_id": "155",
"category": "KIDS BEDROOM",
"new": "0"
}, {
"tag": "child",
"child_category_id": "63",
"category": "Kids Beds",
"new": "1"
}, {
"tag": "child",
"child_category_id": "64",
"category": "Bunk Beds",
"new": "0"
}, {
"tag": "child",
"child_category_id": "156",
"category": "Cribs",
"new": "0"
}, {
"tag": "child",
"child_category_id": "157",
"category": "Kids Storage",
"new": "0"
}, {
"tag": "parent",
"child_category_id": "293",
"category": "KIDS STUDY ROOM",
"new": "0"
}, {
"tag": "child",
"child_category_id": "37",
"category": "Kids Chairs",
"new": "0"
}, {
"tag": "child",
"child_category_id": "31",
"category": "Kids Study Tables",
"new": "0"
}]
},
"DECOR": {
"icon": "https:\/\/www.woodenstreet.com\/images\/mobileapp\/drawericon\/decor.png",
"Items": [{
"tag": "parent",
"child_category_id": "74",
"category": "LAMPS & LIGHTING",
"new": "0"
}, {
"tag": "child",
"child_category_id": "573",
"category": "Table Lamps",
"new": "0"
}, {
"tag": "child",
"child_category_id": "1084",
"category": "Floor Lamps",
"new": "0"
}, {
"tag": "child",
"child_category_id": "558",
"category": "Study Lamps",
"new": "0"
}, {
"tag": "child",
"child_category_id": "557",
"category": "Tripod Lamps",
"new": "0"
}, {
"tag": "child",
"child_category_id": "71",
"category": "Hanging Lights",
"new": "0"
}, {
"tag": "parent",
"child_category_id": "176",
"category": "Home Furnishing",
"new": "0"
}, {
"tag": "child",
"child_category_id": "176",
"category": "Rugs And Carpets",
"new": "0"
}, {
"tag": "child",
"child_category_id": "521",
"category": "Cushions",
"new": "0"
}, {
"tag": "child",
"child_category_id": "547",
"category": "Cushion Covers",
"new": "0"
}, {
"tag": "child",
"child_category_id": "506",
"category": "Curtains",
"new": "0"
}, {
"tag": "child",
"child_category_id": "566",
"category": "Bed Sheets",
"new": "0"
}, {
"tag": "child",
"child_category_id": "567",
"category": "Quilts",
"new": "0"
}, {
"tag": "child",
"child_category_id": "1094",
"category": "Runners",
"new": "0"
}, {
"tag": "parent",
"child_category_id": "73",
"category": "Photo Frames",
"new": "0"
}, {
"tag": "child",
"child_category_id": "73",
"category": "Photo Frames",
"new": "0"
}, {
"tag": "child",
"child_category_id": "1085",
"category": "Single Photo Frames",
"new": "0"
}, {
"tag": "child",
"child_category_id": "1086",
"category": "Multi Photo Frames",
"new": "0"
}, {
"tag": "child",
"child_category_id": "1087",
"category": "Collage Photo Frames",
"new": "0"
}, {
"tag": "parent",
"child_category_id": "74",
"category": "Decor Accessories",
"new": "0"
}, {
"tag": "child",
"child_category_id": "579",
"category": "Artificial Flowers",
"new": "0"
}, {
"tag": "child",
"child_category_id": "411",
"category": "Artificial Plants",
"new": "0"
}, {
"tag": "child",
"child_category_id": "594",
"category": "Miniatures",
"new": "0"
}, {
"tag": "child",
"child_category_id": "1089",
"category": "Coasters",
"new": "0"
}, {
"tag": "child",
"child_category_id": "80",
"category": "Figurines",
"new": "0"
}, {
"tag": "parent",
"child_category_id": "74",
"category": "Wall Art",
"new": "0"
}, {
"tag": "child",
"child_category_id": "1093",
"category": "Metal Wall Art",
"new": "0"
}, {
"tag": "child",
"child_category_id": "580",
"category": "Wall Frames",
"new": "0"
}, {
"tag": "child",
"child_category_id": "873",
"category": "Wooden Jharokha",
"new": "0"
}, {
"tag": "child",
"child_category_id": "74",
"category": "Mirror Frames",
"new": "0"
}, {
"tag": "child",
"child_category_id": "1091",
"category": "Wall Tiles",
"new": "0"
}, {
"tag": "child",
"child_category_id": "1092",
"category": "Wall Clocks",
"new": "0"
}, {
"tag": "child",
"child_category_id": "1090",
"category": "Wall Murals",
"new": "0"
}]
}
}
}
这是我为存储动态数据而创建的模型类。
class Categories {
String itemName;
List<Item> items;
Categories({
this.itemName,
this.items,
});
}
class Item {
String tag;
String childCategoryId;
String category;
String itemNew;
Item({
this.tag,
this.childCategoryId,
this.category,
this.itemNew,
});
factory Item.fromJson(Map<String, dynamic> json) => Item(
tag: json["tag"],
childCategoryId: json["child_category_id"],
category: json["category"],
itemNew: json["new"],
);
Map<String, dynamic> toJson() => {
"tag": tag,
"child_category_id": childCategoryId,
"category": category,
"new": itemNew,
};
}
这是获取动态数据的主文件
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:sample_project_for_api/NewModel.dart';
import 'package:sample_project_for_api/model.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
title: 'Flutter Demo',
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
MyModel yourObject = new MyModel();
bool _isLoading = false;
@override
void initState() {
super.initState();
yourMethod();
}
yourMethod() async {
setState(() {
_isLoading = true;
});
String jsonString = await loadFromAssets();
Map newStringMap = json.decode(jsonString);
List<Categories> categoryList = new List();
List<Item> listItem = new List();
newStringMap['categories'].forEach((key, value) {
listItem = List<Item>.from(value["Items"].map((x) => Item.fromJson(x)));
Categories categories = new Categories(itemName: key, items: listItem);
categoryList.add(categories);
});
for (int i = 0; i < categoryList.length; i++) {
print(
'This is the item name ############# : ${categoryList[i].itemName}');
for (int j = 0; j < categoryList[i].items.length; j++) {
print(
'This is the item length --------- :${categoryList[i].items[j].category}');
}
}
setState(() {
_isLoading = false;
});
}
Future<String> loadFromAssets() async {
return await rootBundle.loadString('json/parse.json');
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[Icon(Icons.ac_unit), Icon(Icons.access_alarm)],
)),
body: Text('sample text'),
);
}
}
让我知道它是否有效。
李意致
首先，您无法使用json[“title”]将键作为title来获取。我已经重写了，让我们看看：
Map<String, dynamic> categoriesJson = data["categories"];
// get all category name with this because you can't get the key name with "title"
List<String> categoriesName = categoriesJson.keys.map((key) {
return key.toString();
}).toList();
// depend on the key name, rewrite new Map and put the key name and Items to it
for (String categoryName in categoriesName) {
Map<String, dynamic> category = {
"title": categoriesName,
"Items": categoriesJson[categoriesName]["Items"]
};
categories.add(Categories.fromJson(category));
}
廉元龙
你试过用var代替Map吗？
for (var i in data) {
categories.add(Categories.fromJson(i));
}
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