This is my first flutter tutorial, which explain how you can host and read json data from GitHub repository.
First up all you need to host json in GitHub Page , here is the complete guide. After that you can read the data using http package in Flutter.
First up all you need to specify the pubspec.yml settings as follows
dependencies:
flutter:
sdk: flutter
http: ^0.12.0+2
Go to your pubspec file and add the high lighted sections to use the network/web connection.
Now we need a Model class to read and hold the json object. Eventually the fetchpost Future will extract the data from GitHub.
Future<Post> fetchPost() async {
final response = await http.get('https://jdata-server.github.io/data.json');
if (response.statusCode == 200) {
// If server returns an OK response, parse the JSON
return Post.fromJson(json.decode(response.body));
} else {
// If that response was not OK, throw an error.
throw Exception('Failed to load post');
}
}
A special function called FutureBuilder help us to feched post object.Here is the complete main.dart file
import 'package:flutter/material.dart';
import 'dart:convert';
import 'package:http/http.dart' as http;
import 'dart:async';
Future<Post> fetchPost() async {
final response = await http.get('https://jdata-server.github.io/data.json');
if (response.statusCode == 200) {
// If server returns an OK response, parse the JSON
return Post.fromJson(json.decode(response.body));
} else {
// If that response was not OK, throw an error.
throw Exception('Failed to load post');
}
}
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
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> {
Future<Post> post;
void initState() {
super.initState();
post = fetchPost();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: FutureBuilder<Post>(
future: post,
builder: (context, snapshot) {
if (snapshot.hasData) {
return new ListView(children: <Widget>[
new Text("Q:" + snapshot.data.question),
new Text("A:" + snapshot.data.answer)
]);
} else if (snapshot.hasError) {
return Text("${snapshot.error}");
}
// By default, show a loading spinner
return CircularProgressIndicator();
},
)),
floatingActionButton: FloatingActionButton(
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}
class Post {
final String question;
final String answer;
final String catagory;
Post({this.question, this.answer, this.catagory});
factory Post.fromJson(Map<String, dynamic> json) {
return Post(
question: json['question'],
answer: json['answer'],
catagory: json['catagory']);
}
}
