Flutter use one Variable in different classes Error: Getter not found: 'allJobs' - flutter

Question

I have a Variable in one Class but and i want to use it in all.
In this Example is the allJobs Variable which is declared in Muesnterboerse ore MuensterboerseAAAngebote and i want to use it in senddate().
class Muensterboerse extends StatelessWidget {
var allJobs = 1;
#override
Widget build(BuildContext context) {
return new MaterialApp(
debugShowCheckedModeBanner: false,
title: 'Flutter App with MYSQL',
home: new MyHomePage(),
);
}
}
class MuensterboerseAAAngebote extends StatelessWidget {
var allJobs = 0;
#override
Widget build(BuildContext context) {
return new MaterialApp(
debugShowCheckedModeBanner: false,
title: 'Flutter App with MYSQL',
home: new MyHomePage(),
);
}
}
Future<dynamic> senddata() async {
final response = await http.post(
"https://www.bumsbirnbe.php", body: {
"status": allJobs,
});
var datauser = json.decode(response.body);
String jsonsDataString = datauser.toString();
dynamic jsonData = jsonDecode(jsonsDataString);
print(jsonData);
return jsonData;
}
Update
Now i added your changes to my code but i get the
Error: Unhandled Exception: NoSuchMethodError: The getter 'allJobs' was called on null.
This is my whole code:
import 'dart:async';
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
GlobalKey _key1 = GlobalKey();
class Muensterboerse extends StatelessWidget {
Muensterboerse({Key key}) : super(key: key);
int allJobs = 1;
#override
Widget build(BuildContext context) {
return new MaterialApp(
debugShowCheckedModeBanner: false,
title: 'Flutter App with MYSQL',
home: new MyHomePage(),
);
}
}
class AAAngebote extends StatelessWidget {
AAAngebote({Key key}) : super(key: key);
int allJobs = 2;
#override
Widget build(BuildContext context) {
return new MaterialApp(
debugShowCheckedModeBanner: false,
title: 'Flutter App with MYSQL',
home: new MyHomePage(),
);
}
}
Future<dynamic> senddata() async {
int allJobs = (_key1.currentWidget as Muensterboerse).allJobs;
print(allJobs);
final response = await http.post(
"https://www.Bumsbirne.php", body: {
"status": allJobs,
});
var datauser = json.decode(response.body);
String jsonsDataString = datauser.toString();
dynamic jsonData = jsonDecode(jsonsDataString);
print(jsonData);
return jsonData;
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
dynamic jsonData;
callSendData() async {
jsonData = await senddata();
setState(() {});
}
//lol
#override
void initState() {
callSendData();
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: jsonData == null
? Center(child: CircularProgressIndicator())
: ListView.builder(
padding: const EdgeInsets.all(16.0),
itemCount: jsonData == null ? 0 : jsonData.length,
itemBuilder: (context, index) {
return ListTile(
leading: CircleAvatar(
backgroundImage: NetworkImage('https://kinsta.com/de/wpcontent/uploads/sites/5/2019/09/wordpress-loggst-url-1024x512.jpg'),
radius: 27,
),
title: Text(
jsonData[index]["titel"],
),
subtitle: Text(jsonData[index]["nam_ersteller"]),
trailing: Text(
'25 Km',
style: TextStyle(color: Colors.grey,
fontSize: 12,
decoration: TextDecoration.none,
fontFamily: 'Roboto',),
),
onTap: () {
Navigator.push(context,
new MaterialPageRoute(builder: (context) => DetailPage()));
},
);
// return _buildRow(data[index]);
}));
}
}
class DetailPage extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Der Job'),
),
);
}
}

Answer 1

You can copy paste run full code below
Step 1: You can use GlobalKey and pass to Muensterboerse(key: _key1)
Step 2: In senddata(), do (_key1.currentWidget as Muensterboerse).allJobs;
code snippet
GlobalKey _key1 = GlobalKey();
...
class Muensterboerse extends StatelessWidget {
Muensterboerse({Key key}) : super(key: key);
...
Future<dynamic> senddata() async {
int allJobs = (_key1.currentWidget as Muensterboerse).allJobs;
print(allJobs);
...
Muensterboerse(key: _key1),
output of senddata()
I/flutter (22480): 1
full code
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
GlobalKey _key1 = GlobalKey();
class Muensterboerse extends StatelessWidget {
Muensterboerse({Key key}) : super(key: key);
int allJobs = 1;
#override
Widget build(BuildContext context) {
return Column(
children: [
Text("$allJobs"),
],
);
}
}
Future<dynamic> senddata() async {
int allJobs = (_key1.currentWidget as Muensterboerse).allJobs;
print(allJobs);
/*final response = await http.post(
"https://www.quyre.de/2/Muensterboerse.N.php", body: {
"status": allJobs
});*/
}
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
void _incrementCounter() async{
await senddata();
setState(() {
_counter++;
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Muensterboerse(key: _key1),
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.headline4,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}