Mysql 颤振,如何获取对象的数据数组并显示给ListView.builder?
我是颤振新手,我想从本地主机phpmydmin获取数据。 这是我的json:Mysql 颤振,如何获取对象的数据数组并显示给ListView.builder?,mysql,flutter,dart,flutter-futurebuilder,Mysql,Flutter,Dart,Flutter Futurebuilder,我是颤振新手,我想从本地主机phpmydmin获取数据。 这是我的json: { "status": true, "message": "Data ditemukan", "data": [ { "id": "1", "username": "admin&quo
{
"status": true,
"message": "Data ditemukan",
"data": [
{
"id": "1",
"username": "admin",
"password": "d033e22ae348aeb5660fc2140aec35850c4da997",
"nama": "admin",
"token": "2a5c97cb31308b8d818da33a041fa47d"
},
{
"id": "3",
"username": "sani",
"password": "86862f0600c8b9829d9ca9c8aaca3f0727b44b6e",
"nama": "Sani Sandhika",
"token": "661e23835d27f9d45cf371f59533f163"
},
{
"id": "4",
"username": "seno",
"password": "d61a4fe61485d6437b698c11635d8fb8c5b79d2f",
"nama": "Seno",
"token": "7b9f0f54ca01c323bc810206adcaa38c"
},
{
"id": "5",
"username": "username",
"password": "5baa61e4c9b93f3f0682250b6cf8331b7ee68fd8",
"nama": "nama",
"token": null
}
]
}
这是我的用户模型:
import 'dart:convert';
List<User> allUsers(String str) {
final jsonData = json.decode(str);
return new List<User>.from(jsonData.map((x) => User.fromJson(x)));
}
class User {
bool status;
String message;
List<Data> data;
User({
this.status,
this.message,
this.data,
});
factory User.fromJson(Map<String, dynamic> parsedJson) {
var list = parsedJson['data'] as List;
print(list.runtimeType);
List<Data> dataList = list.map((i) => Data.fromJson(i)).toList();
return User(
status: parsedJson['status'],
message: parsedJson['message'],
data: dataList,
);
}
}
class Data {
final int id;
final String nama;
final String username;
Data({
this.id,
this.nama,
this.username,
});
factory Data.fromJson(Map<String, dynamic> parsedJson) {
return Data(
id: parsedJson['id'],
nama: parsedJson['nama'],
username: parsedJson['username'],
);
}
}
导入'dart:convert';
列表用户(字符串str){
最终jsonData=json.decode(str);
返回新的List.from(jsonData.map((x)=>User.fromJson(x));
}
类用户{
布尔状态;
字符串消息;
列出数据;
使用者({
这个,身份,,
这条信息,
这个数据,,
});
factory User.fromJson(Map parsedJson){
var list=parsedJson['data']作为列表;
打印(list.runtimeType);
List dataList=List.map((i)=>Data.fromJson(i)).toList();
返回用户(
状态:parsedJson['status'],
message:parsedJson['message'],
数据:数据列表,
);
}
}
类数据{
最终int id;
最终字符串nama;
最终字符串用户名;
资料({
这个身份证,
这是nama,
这个.username,
});
factory Data.fromJson(Map parsedJson){
返回数据(
id:parsedJson['id'],
nama:parsedJson['nama'],
用户名:parsedJson['username'],
);
}
}
这是我的建议:
import 'package:flutter_rest_api_crud/models/models.dart';
import 'package:http/http.dart' as http;
class RestApi {
String url = 'http://192.168.1.5/gizi/user/';
Future<List<User>> getUsers() async {
final response = await http.get('$url/user');
print(response.body);
return allUsers(response.body);
}
}
import'包:flatter_rest_api_crud/models/models.dart';
将“package:http/http.dart”导入为http;
类RestApi{
字符串url='0http://192.168.1.5/gizi/user/';
未来的getUsers()异步{
最终响应=等待http.get(“$url/user”);
打印(响应.正文);
返回诱惑者(响应。主体);
}
}
最后是我的主屏幕:
import 'package:http/http.dart' as http;
import 'package:flutter/material.dart';
class HomeScreen extends StatefulWidget {
HomeScreen({Key key}) : super(key: key);
@override
_HomeScreenState createState() => _HomeScreenState();
}
class _HomeScreenState extends State<HomeScreen> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
);
}
}
import'package:http/http.dart'作为http;
进口“包装:颤振/材料.省道”;
类主屏幕扩展StatefulWidget{
主屏幕({Key}):超级(Key:Key);
@凌驾
_HomeScreenState createState()=>\u HomeScreenState();
}
类_homescrenstate扩展状态{
@凌驾
小部件构建(构建上下文){
返回脚手架(
appBar:appBar(),
);
}
}
我想从localhost phpmyadmin获取“data”中的数据。并将其放在ListView.builder上。我也不知道下一步要在我的主屏幕上实现listview。
有人能帮我吗?您可以在初始化
小部件后点击API端点:
List<User> _users = [];
@override
void initState() {
super.initState();
_load();
}
void _load() async {
List<User> users =
await RestApi.getUsers(); // load the users on Widget init
setState(() => _users = users);
}
下面是一个完整的示例:
class _HomeScreenState extends State<HomeScreen> {
List<User> _users = [];
@override
void initState() {
super.initState();
_load();
}
void _load() async {
List<User> users =
await RestApi.getUsers(); // load the users on Widget init
setState(() => _users = users);
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: new ListView.builder(
itemCount: _users.length,
itemBuilder: (BuildContext ctxt, int i) {
return new Card(
child: Column(
children: [
Text(_users[i].username),
ListView.builder(
itemCount: _users[i].data.length,
itemBuilder: (BuildContext ctx, int j) {
return Text(_users[i]
.data[j]
.username); // display username as an example
},
),
],
),
);
},
),
);
}
}
class\u homescrenstate扩展状态{
列表_用户=[];
@凌驾
void initState(){
super.initState();
_加载();
}
void\u load()异步{
列出用户=
等待RestApi.getUsers();//在Widget init上加载用户
设置状态(()=>\u用户=用户);
}
@凌驾
小部件构建(构建上下文){
返回脚手架(
appBar:appBar(),
正文:新建ListView.builder(
itemCount:_users.length,
itemBuilder:(BuildContext ctxt,int i){
归还新卡(
子:列(
儿童:[
文本(_用户[i].用户名),
ListView.builder(
itemCount:_用户[i].data.length,
itemBuilder:(BuildContext ctx,int j){
返回文本(_用户[i]
.数据[j]
.username);//以显示用户名为例
},
),
],
),
);
},
),
);
}
}
随着您的应用程序变得越来越复杂,我建议您查看不同的状态管理
策略,例如BLoC
谢谢您的回答。它的工作。现在,我将使用您的建议的bloc表单乐意提供帮助,别忘了选择正确的答案!
class _HomeScreenState extends State<HomeScreen> {
List<User> _users = [];
@override
void initState() {
super.initState();
_load();
}
void _load() async {
List<User> users =
await RestApi.getUsers(); // load the users on Widget init
setState(() => _users = users);
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(),
body: new ListView.builder(
itemCount: _users.length,
itemBuilder: (BuildContext ctxt, int i) {
return new Card(
child: Column(
children: [
Text(_users[i].username),
ListView.builder(
itemCount: _users[i].data.length,
itemBuilder: (BuildContext ctx, int j) {
return Text(_users[i]
.data[j]
.username); // display username as an example
},
),
],
),
);
},
),
);
}
}