Created
August 24, 2018 18:18
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Display JSON data in Flutter : Using the setState() method
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| import 'package:flutter/material.dart'; | |
| import 'dart:convert'; | |
| import 'dart:async' show Future; | |
| import 'package:flutter/services.dart' show rootBundle; | |
| class Student { | |
| String studentId; | |
| String studentName; | |
| int studentScores; | |
| Student({this.studentId, this.studentName, this.studentScores}); | |
| factory Student.fromJson(Map<String, dynamic> parsedJson) { | |
| return Student( | |
| studentId: parsedJson['id'], | |
| studentName: parsedJson['name'], | |
| studentScores: parsedJson['score']); | |
| } | |
| } | |
| Future<String> _loadAStudentAsset() async { | |
| return await rootBundle.loadString('assets/student.json'); | |
| } | |
| Future<Student> loadStudent() async { | |
| await wait(5); | |
| String jsonString = await _loadAStudentAsset(); | |
| final jsonResponse = json.decode(jsonString); | |
| return new Student.fromJson(jsonResponse); | |
| } | |
| Future wait(int seconds) { | |
| return new Future.delayed(Duration(seconds: seconds), () => {}); | |
| } | |
| void main() { | |
| runApp(MyApp()); | |
| } | |
| class MyApp extends StatefulWidget { | |
| MyApp(); | |
| @override | |
| MyAppState createState() => MyAppState(); | |
| } | |
| class MyAppState extends State<MyApp> { | |
| Student _student; | |
| bool _loaded = false; | |
| @override | |
| void initState() { | |
| super.initState(); | |
| loadStudent().then((s) => setState(() { | |
| _student = s; | |
| _loaded = true; | |
| })); | |
| } | |
| @override | |
| Widget build(BuildContext context) { | |
| return new MaterialApp( | |
| home: new Scaffold( | |
| appBar: new AppBar( | |
| title: new Text('Load Json'), | |
| ), | |
| body: _loaded | |
| ? new Container( | |
| padding: new EdgeInsets.all(20.0), | |
| child: new Row( | |
| children: <Widget>[ | |
| Text( | |
| "Hi ${_student.studentName} your id is ${_student.studentId} and score ${_student.studentScores} ") | |
| ], | |
| )) | |
| : new Center( | |
| child: new CircularProgressIndicator(), | |
| )), | |
| ); | |
| } | |
| } |
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