不能'；无法从API获取任何数据
我面临从API获取数据的问题。我认为json API中的“数据”造成了一个问题。以下是我的json API链接： 这是我的模型-不能'；无法从API获取任何数据,api,flutter,get,Api,Flutter,Get,我面临从API获取数据的问题。我认为json API中的“数据”造成了一个问题。以下是我的json API链接： 这是我的模型- 导入'dart:async'； 导入“dart:convert”； 将“package:http/http.dart”导入为http； 字符串base_url=”https://boimarket.abirahsan.com/api/v1/categories/1/books"; Future fetchBooks（）异步{ var response=wait htt
导入'dart:async'；
导入“dart:convert”；
将“package:http/http.dart”导入为http；
字符串base_url=”https://boimarket.abirahsan.com/api/v1/categories/1/books";
Future fetchBooks（）异步{
var response=wait http.get（base_url）；
如果（response.statusCode==200）{
打印（响应.正文）；
returnbook.fromJson（json.decode（response.body））；
}否则{
抛出异常（'加载书本失败'）；
}
}
课堂用书{
最后的字符串名；
最终字符串作者；
最终字符串genreClass；
最终字符串imgUrl；
最终字符串pdf；
最终字符串html；
最终字符串描述；
最终字符串类别；
书({
这个名字，
这位作者，
这是genreClass，
这个，imgUrl，
这个.说明,，
这个.html，
此网址为http://www.pdf，
这一类,，
});
factory Book.fromJson（映射json）{
回执(
名称：json['name']，
imgUrl:json['image']，
pdf:json['pdf']，
html:json['html']，
description:json['description']，
作者：json['author']，
genreClass:json['genre_class']，
类别：json['category']，
);
}
}
import 'package:boimarket/booksdescription.dart';
import 'package:boimarket/model/model.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:draggable_scrollbar/draggable_scrollbar.dart';
class StoryBooksCategory extends StatefulWidget {
final ScrollController controller;
final List<Book> storybooks;
StoryBooksCategory({Key key, @required this.controller, this.storybooks})
: super(key: key);
@override
_StoryBooksCategoryState createState() => _StoryBooksCategoryState();
}
class _StoryBooksCategoryState extends State<StoryBooksCategory> {
@override
void initState() {
super.initState();
}
@override
Widget build(BuildContext context) {
var _height = MediaQuery.of(context).size.height;
var _width = MediaQuery.of(context).size.width;
final Color _whiteCream = Color.fromRGBO(250, 245, 228, 1);
final Color _darkBlue = Color.fromRGBO(0, 68, 69, 1);
return Align(
alignment: Alignment.topCenter,
child: Container(
width: _width / 1.1,
child: StreamBuilder(
stream: fetchBooks().asStream(),
builder: (context, snapshot) {
if (!snapshot.hasData) {
return Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
LinearProgressIndicator(
backgroundColor: _whiteCream,
),
Text("Loading"),
],
);
} else if (snapshot.hasData) {
var mydata = snapshot.data;
print(mydata.length);
return DraggableScrollbar.rrect(
controller: widget.controller,
backgroundColor: _darkBlue,
child: ListView.builder(
controller: widget.controller,
scrollDirection: Axis.vertical,
itemCount: mydata.length,
itemBuilder: (context, index) {
return GestureDetector(
onTap: () {
Route route = MaterialPageRoute(
builder: (context) =>
BookDescription(storyBooksValue: mydata[index]),
);
Navigator.push(context, route);
},
child: Padding(
padding: const EdgeInsets.only(
left: 10.0, right: 10.0, top: 20.0),
child: Container(
width: _width / 1.1,
height: _height / 4,
decoration: BoxDecoration(
color: _whiteCream,
borderRadius: BorderRadius.all(
Radius.circular(5.0),
),
boxShadow: [
BoxShadow(
color: Colors.black26,
blurRadius: 2,
spreadRadius: 2,
offset: Offset(2.0, 2.0),
)
]),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
Flexible(
flex: 4,
child: Padding(
padding: const EdgeInsets.all(10.0),
child: Card(
elevation: 10.0,
child: ClipRRect(
borderRadius: BorderRadius.circular(5.0),
child: FadeInImage.assetNetwork(
fadeOutCurve: Curves.easeInCubic,
placeholder:
'assets/images/bookshelf.jpg',
image: mydata[index].imgUrl == null
? 'assets/images/bookshelf.jpg'
: mydata[index].imgUrl,
fit: BoxFit.cover,
),
),
),
),
),
Flexible(
flex: 6,
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Row(
children: <Widget>[
Text(
"বইয়ের নামঃ ",
style: TextStyle(
fontWeight: FontWeight.bold),
),
Flexible(
child: Text(
"${mydata[index].name}",
overflow: TextOverflow.ellipsis,
),
),
],
),
Row(
children: <Widget>[
Text(
"লেখকঃ ",
style: TextStyle(
fontWeight: FontWeight.bold),
),
Flexible(
child: Text(
"${mydata[index].author}",
overflow: TextOverflow.ellipsis,
),
),
],
),
Row(
children: <Widget>[
Text(
"বইয়ের ধরণঃ ",
style: TextStyle(
fontWeight: FontWeight.bold),
),
Flexible(
child: Text(
"${mydata[index].genreClass}",
overflow: TextOverflow.ellipsis,
),
),
],
),
],
),
),
],
),
),
),
);
},
),
);
} else {
return Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Icon(Icons.error_outline),
Text("Somthing Went to wrong"),
],
);
}
},
),
),
);
}
}
import'包装：boimarket/booksdescription.dart'；
进口“包装：boimarket/model/model.dart”；
进口“包装：颤振/基础.dart”；
进口“包装：颤振/材料.省道”；
导入“package:draggable_scrollbar/draggable_scrollbar.dart”；
类StoryBooksCategory扩展了StatefulWidget{
最终滚动控制器；
最后列出故事书；
StoryBooksCategory（{Key，@required this.controller，this.storybooks}）
：super（key:key）；
@凌驾
_StoryBooksCategoryState createState（）=>\u StoryBooksCategoryState（）；
}
类_StoryBooksCategoryState扩展状态{
@凌驾
void initState（）{
super.initState（）；
}
@凌驾
小部件构建（构建上下文）{
var\u height=MediaQuery.of（context）.size.height；
var _width=MediaQuery.of（context）.size.width；
最终颜色_whiteCream=颜色。来自RGBO（2502452281）；
最终颜色_darkBlue=Color.fromRGBO（0,68,69,1）；
返回对齐(
对齐：alignment.topCenter，
子：容器(
宽度：_宽度/1.1，
孩子：StreamBuilder(
流：fetchBooks（）.asStream（），
生成器：（上下文，快照）{
如果（！snapshot.hasData）{
返回列(
mainAxisAlignment:mainAxisAlignment.center，
crossAxisAlignment:crossAxisAlignment.center，
儿童：[
线性预测指示器(
背景颜色：_whiteCream，
),
文本（“加载”），
],
);
}else if（snapshot.hasData）{
var mydata=snapshot.data；
打印（mydata.length）；
返回DragableScrollbar.rect(
控制器：widget.controller，
背景色：_深蓝色，
子项：ListView.builder(
控制器：widget.controller，
滚动方向：轴垂直，
itemCount:mydata.length，
itemBuilder：（上下文，索引）{
返回手势检测器(
onTap:（）{
路线=物料管理路线(
生成器：（上下文）=>
BookDescription（StoryBookValue:mydata[索引]），
);
推送（上下文、路线）；
},
孩子：填充(
填充：仅限常量边设置(
左：10.0，右：10.0，顶：20.0），
子：容器(
宽度：_宽度/1.1，
高度：_高度/4，
装饰：盒子装饰(
颜色：白色奶油，
borderRadius:borderRadius.all(
圆形半径（5.0），
),
boxShadow：[
箱形阴影(
颜色：颜色。黑色，
半径：2，
扩展半径：2，
偏移量：偏移量（2.0,2.0），
)
]),
孩子：排(
mainAxisAlignment:mainAxisAlignment.space，
儿童：[
灵活的(
弹性：4，
孩子：填充(
填充：常数边集全部（10.0），
孩子：卡片(
标高：10.0，
孩子：ClipRRect(
边界半径：边界半径。圆形（5.0），
子项：FadeInImage.assetNetwork(
淡出曲线：曲线。淡出曲线，
占位符：
“资产/图像/书架.jpg”，
图像：mydata[index].imgUrl==null
？“资产/图像/书架.jpg”
：mydata[index].imgUrl，
适合：BoxFit.cover，
),
),
),
),
),
import 'package:boimarket/booksdescription.dart';
import 'package:boimarket/model/model.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:draggable_scrollbar/draggable_scrollbar.dart';
class StoryBooksCategory extends StatefulWidget {
final ScrollController controller;
final List<Book> storybooks;
StoryBooksCategory({Key key, @required this.controller, this.storybooks})
: super(key: key);
@override
_StoryBooksCategoryState createState() => _StoryBooksCategoryState();
}
class _StoryBooksCategoryState extends State<StoryBooksCategory> {
@override
void initState() {
super.initState();
}
@override
Widget build(BuildContext context) {
var _height = MediaQuery.of(context).size.height;
var _width = MediaQuery.of(context).size.width;
final Color _whiteCream = Color.fromRGBO(250, 245, 228, 1);
final Color _darkBlue = Color.fromRGBO(0, 68, 69, 1);
return Align(
alignment: Alignment.topCenter,
child: Container(
width: _width / 1.1,
child: StreamBuilder(
stream: fetchBooks().asStream(),
builder: (context, snapshot) {
if (!snapshot.hasData) {
return Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
LinearProgressIndicator(
backgroundColor: _whiteCream,
),
Text("Loading"),
],
);
} else if (snapshot.hasData) {
var mydata = snapshot.data;
print(mydata.length);
return DraggableScrollbar.rrect(
controller: widget.controller,
backgroundColor: _darkBlue,
child: ListView.builder(
controller: widget.controller,
scrollDirection: Axis.vertical,
itemCount: mydata.length,
itemBuilder: (context, index) {
return GestureDetector(
onTap: () {
Route route = MaterialPageRoute(
builder: (context) =>
BookDescription(storyBooksValue: mydata[index]),
);
Navigator.push(context, route);
},
child: Padding(
padding: const EdgeInsets.only(
left: 10.0, right: 10.0, top: 20.0),
child: Container(
width: _width / 1.1,
height: _height / 4,
decoration: BoxDecoration(
color: _whiteCream,
borderRadius: BorderRadius.all(
Radius.circular(5.0),
),
boxShadow: [
BoxShadow(
color: Colors.black26,
blurRadius: 2,
spreadRadius: 2,
offset: Offset(2.0, 2.0),
)
]),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
Flexible(
flex: 4,
child: Padding(
padding: const EdgeInsets.all(10.0),
child: Card(
elevation: 10.0,
child: ClipRRect(
borderRadius: BorderRadius.circular(5.0),
child: FadeInImage.assetNetwork(
fadeOutCurve: Curves.easeInCubic,
placeholder:
'assets/images/bookshelf.jpg',
image: mydata[index].imgUrl == null
? 'assets/images/bookshelf.jpg'
: mydata[index].imgUrl,
fit: BoxFit.cover,
),
),
),
),
),
Flexible(
flex: 6,
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Row(
children: <Widget>[
Text(
"বইয়ের নামঃ ",
style: TextStyle(
fontWeight: FontWeight.bold),
),
Flexible(
child: Text(
"${mydata[index].name}",
overflow: TextOverflow.ellipsis,
),
),
],
),
Row(
children: <Widget>[
Text(
"লেখকঃ ",
style: TextStyle(
fontWeight: FontWeight.bold),
),
Flexible(
child: Text(
"${mydata[index].author}",
overflow: TextOverflow.ellipsis,
),
),
],
),
Row(
children: <Widget>[
Text(
"বইয়ের ধরণঃ ",
style: TextStyle(
fontWeight: FontWeight.bold),
),
Flexible(
child: Text(
"${mydata[index].genreClass}",
overflow: TextOverflow.ellipsis,
),
),
],
),
],
),
),
],
),
),
),
);
},
),
);
} else {
return Column(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Icon(Icons.error_outline),
Text("Somthing Went to wrong"),
],
);
}
},
),
),
);
}
}
Future<List<Book>> fetchBooks() async {
var response = await http.get(base_url);
if (response.statusCode == 200) {
var decoded = json.decode(response.body);
return decoded['data'].map<Book>((b) => Book.fromJson(b)).toList();
} else {
throw Exception('Failed to load Book');
}
}
class Book {
final String name;
final String author;
final String genreClass;
final String imgUrl;
final String pdf;
final String html;
final String description;
final int category; //<- this is an int