I'm new to flutter. I am getting an error like this, can you help me?
I've been stuck in http for json for 5 days, the codes in the source don't work. :( L
It says list not entered but when I enter it does not accept it. I don't know on which line the problem is, but I got a warning like. "The following NoSuchMethodError was thrown building FutureBuilder(dirty, state: _FutureBuilderState#447cc):"
https://dosya.co/w8rxecrl44rz/Capture.JPG.html
https://dosya.co/vk6rd85o7zkx/Capture.JPG2.JPG.html - import 'dart:convert';
-
-
Post postFromJson(String str) => Post.fromJson(json.decode(str));
-
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String postToJson(Post data) => json.encode(data.toJson());
-
-
class Post {
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Post({
-
required this.userId,
-
required this.id,
-
required this.title,
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required this.body,
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});
-
-
int userId;
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int id;
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String title;
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String body;
-
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factory Post.fromJson(Map<String, dynamic> json) => Post(
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userId: json["userId"],
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id: json["id"],
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title: json["title"],
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body: json["body"],
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);
-
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Map<String, dynamic> toJson() => {
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"userId": userId,
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"id": id,
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"title": title,
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"body": body,
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};
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}
- import 'dart:convert';
-
-
-
import 'package:flutter/material.dart';
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import 'package:http/http.dart' as http;
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import 'package:json_http_place_holder/post.dart';
-
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void main() {
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runApp(const MyApp());
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}
-
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class MyApp extends StatefulWidget {
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const MyApp({Key? key}) : super(key: key);
-
-
@override
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State<MyApp> createState() => _MyAppState();
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}
-
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class _MyAppState extends State<MyApp> {
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Future getData = Future(() => null);
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var con = Uri.parse("https://jsonplaceholder.typicode.com/posts");
-
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Future<List<Post>> fetchPost() async {
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List<Post> result = <Post>[];
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final response = await http.get(con);
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if (response.statusCode == 200) {
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List listPost = jsonDecode(response.body);
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for (int i = 0; i < listPost.length; i++) {
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Post item = Post.fromJson(listPost[i]);
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result.add(item);
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}
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}
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return result;
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}
-
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@override
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void initState() {
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// TODO: implement initState
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super.initState();
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getData = fetchPost();
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}
-
-
@override
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Widget build(BuildContext context) {
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return MaterialApp(
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title: 'Flutter HTTP json',
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theme: ThemeData(
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primarySwatch: Colors.blue,
-
),
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home: Scaffold(
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body: FutureBuilder(
-
future: getData,
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builder: (BuildContext context, AsyncSnapshot<dynamic> snapshot) {
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if (snapshot.connectionState == ConnectionState.waiting) {
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return const Center(
-
child: CircularProgressIndicator(),
-
);
-
} else if (snapshot.connectionState == ConnectionState.none) {
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return const Center(
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child: Text("Bir hata meydana geldi"),
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);
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} else if (snapshot.connectionState == ConnectionState.done) {
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return ListView.separated(itemBuilder: (context,index){
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return ListTile(
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leading: Icon(Icons.local_post_office),
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title: Text(snapshot.data[index].title),
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subtitle: Text(snapshot.data[index].body),
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);
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},separatorBuilder: (context,index)=>Divider(),
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itemCount: snapshot.data.lenght,
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);
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}
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//var d =jsonDecode(snapshot.data.body);
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return Container();
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},
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),
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),
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);
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}
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}
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