In this flutter tutorial we will learn how to parse JSON data in flutter. In this we will read JSON file from assets folder and fetch the data from the file. I have copied JSON files in Assets folder and fetch the data from that JSON files Let's get started Step 1: Create flutter application Step 2: Add required json files inside assets folder Step 3: Define assets inside pubspec.yaml file to access inside application Step 4: Read JSON from assets folder Now we will use DefaultAssetBundle.of(context).loadString() method to read json file from assets folder Step 5: From the above method it will return json string, now we need to read data from the json and parse json data and display on UI screen. Complete code main.dart file details.dart item.dart model class Download Parse JSON data from Assets folder Tags: Flutter, Read local JSON file, Fetch JSON file, Parse JSON data, Gridview
assets:
- spices.json
- vegetable.json
await DefaultAssetBundle.of(context).loadString("assets/$file")
.then((s) {
setState(() {
var response = json.decode(s);
List<dynamic> list_telugu = response['telugu'];
List<dynamic> list_english = response['english'];
for (var k = 0; k < list_telugu.length; k++) {
list_items.add(Items(list_english[k], list_telugu[k]));
}
});
}).catchError((error) {
print(error);
});
import 'package:flutter/material.dart';
import 'dart:convert';
import 'details.dart';
import 'model/items.dart';
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(),
);
}
}
class MyHomePage extends StatefulWidget {
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
Size size;
@override
Widget build(BuildContext context) {
size=MediaQuery.of(context).size;
return Scaffold(
backgroundColor: Colors.grey,
appBar: AppBar(
backgroundColor: Colors.pink,
title: Text("Spices & Vegitables"),
),
body: Stack(
children: <Widget>[
Container(
width: double.infinity,
height: double.infinity,
decoration: BoxDecoration(
borderRadius: BorderRadius.only(
bottomRight: Radius.elliptical( size.width, size.width),
topRight: Radius.circular(size.width/2),
topLeft: Radius.circular(size.width/2),
),
color: Colors.white54
),
),
Padding(
padding: const EdgeInsets.all(8.0),
child: GridView.count(
mainAxisSpacing: 10,
childAspectRatio: 320/470,
crossAxisCount: 2,
crossAxisSpacing: 5,
children: <Widget>[
///----------------Item One-----------------------------
InkWell(
onTap:(){
loadDetail(context,1);
},
child: Card(
elevation: 15,
child: Stack(
children: <Widget>[
Image.asset("spices.png", fit: BoxFit.cover,height: 320,),
Align(
alignment:Alignment.bottomCenter,
child: Container(width:double.infinity,color:Colors.white70,child: Text( "Spices\n View",style: TextStyle(color: Colors.pink,fontSize: 20,fontStyle: FontStyle.italic),textAlign: TextAlign.center )),
),
],
)
),
),
///----------------Item two-----------------------------
InkWell(
onTap:(){
loadDetail(context,2);
},
child: Card(
elevation: 15,
child: Stack(
children: <Widget>[
Image.asset("dry_fruite.png", fit: BoxFit.cover,height:320,),
Align(
alignment:Alignment.bottomCenter,
child: Container(width:double.infinity,color:Colors.white70,child: Text( "Dry Fruites\n View",style: TextStyle(color: Colors.pink,fontSize: 20,fontStyle: FontStyle.italic) ,textAlign: TextAlign.center )),
),
],
)
),
),
///----------------Item three-----------------------------
InkWell(
onTap:(){
loadDetail(context,3);
},
child: Card(
elevation: 15,
child: Stack(
children: <Widget>[
Image.asset("vegetables.png", fit: BoxFit.cover,height: 320,),
Align(
alignment:Alignment.bottomCenter,
child: Container(width:double.infinity,color:Colors.white70,child: Text( "Vegetables \n View",style: TextStyle(color: Colors.pink,fontSize: 20,fontStyle: FontStyle.italic),textAlign: TextAlign.center )),
),
],
)
),
),
///----------------Item Four-----------------------------
InkWell(
onTap:(){
loadDetail(context,4);
},
child: Card(
elevation: 15,
child: Stack(
children: <Widget>[
Image.asset("pulses.png", fit: BoxFit.cover,height: 320,),
Align(
alignment:Alignment.bottomCenter,
child: Container(width:double.infinity,color:Colors.white70,child: Text( "Pulses \n View",style: TextStyle(color: Colors.pink,fontSize: 20,fontStyle: FontStyle.italic,),textAlign: TextAlign.center, )),
),
],
)
),
),
],
),
),
],
),
);
}
loadDetail(BuildContext ctx,position)
{
Navigator.push(ctx, MaterialPageRoute(builder: (_){
return DetailsPage(position);
}));
}
}
import 'package:flutter/material.dart';
import 'dart:convert';
import 'model/items.dart';
class DetailsPage extends StatefulWidget {
int position;
DetailsPage(this.position);
@override
State createState() {
return DetailsState();
}
}
class DetailsState extends State<DetailsPage> {
List<Items>list_items;
var imagepath;
@override
void initState() {
// TODO: implement initState
super.initState();
list_items = List();
if(this.widget.position==1)
imagepath= "spices.png";
if(this.widget.position==2)
imagepath= "dry_fruite.png";
if(this.widget.position==3)
imagepath= "vegetables.png";
if(this.widget.position==4)
imagepath= "dry_fruite.png";
readData(this.widget.position);
}
@override
Widget build(BuildContext context) {
// TODO: implement build
return Scaffold(
backgroundColor: Colors.white70,
appBar: AppBar(
backgroundColor: Colors.pink,
leading: InkWell(child: Icon(Icons.arrow_back,color: Colors.white),
onTap: (){
Navigator.pop(context);
},),
),
body: Stack(
children: <Widget>[
Container(color: Colors.grey[500],),
Image.asset(imagepath, fit: BoxFit.cover,height: double.infinity,),
Padding(
padding: const EdgeInsets.all(8.0),
child: (list_items.length==0)?Center(child: CircularProgressIndicator(),):GridView.count(crossAxisCount: 2,
children: <Widget>[
for(final item in list_items)
Card(child: Stack(
children: <Widget>[
Container(color: Colors.white70,),
Center(
child: Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Text(item.name_telugu,style: TextStyle(color: Colors.pink,fontSize: 18),),
Text(item.name_english,style: TextStyle(color: Colors.pink,fontSize: 18),),
],
),
),
],
),
)
],),
),
],
),
);
}
readData(int which) async
{
String file;
switch(which)
{
case 1:
file="spices.json";
break;
case 2:
file="dry_fruites.json";
break;
case 3:
file="vegetable.json";
break;
case 4:
file="pulses.json";
break;
}
await DefaultAssetBundle.of(context).loadString("assets/$file")
.then((s) {
setState(() {
var response = json.decode(s);
List<dynamic> list_telugu = response['telugu'];
List<dynamic> list_english = response['english'];
for (var k = 0; k < list_telugu.length; k++) {
list_items.add(Items(list_english[k], list_telugu[k]));
}
});
}).catchError((error) {
print(error);
});
}
}
import 'package:flutter/material.dart';
class Items{
String name_english;
String name_telugu;
Items(this.name_english,this.name_telugu);
static Items fromJson(Map<String,String>map)
{
}
}
|
Article Contributed By :
|
|
|
|
|
6211 Views |
|