Use it as a global key to access the keys from other classes
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
//Create it as Global key
final myListKey = GlobalKey<AnimatedListState>();
class MyApp extends StatelessWidget {
@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, required this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
final widgets = [
Container(color: Colors.red),
Container(color: Colors.green),
Container(color: Colors.yellow),
];
int currentIndex = 0;
@override
void initState() {
super.initState();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: AnimatedList(
key: myListKey,
initialItemCount: widgets.length,
itemBuilder: (_, index, animation) {
return Container(
height: 100,
child: widgets[index],
);
},
),
);
}
}
I don't know why you want to call this _dialog from outside class, where you can call inside your class. But if you want to do then you can try this code.
import 'package:flutter/material.dart';
import 'alertform.dart';
class MainPage extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: new Text('Test'),
),
body: new Column(
children: <Widget>[
RaisedButton(
child: new Text('Show Alert'),
onPressed: (){
AlertFormState(context).showDialogBox;
},
)
],
),
);
}
}**
import 'package:flutter/material.dart';
class AlertForm extends StatefulWidget {
@override
AlertFormState createState() => AlertFormState();
}
class AlertFormState extends State<AlertForm> {
void showDialogBox(BuildContext context) {
// flutter defined function
showDialog(
context: context,
builder: (BuildContext context) {
// return object of type Dialog
return AlertDialog(
title: new Text("Alert Dialog title"),
content: new Text("Alert Dialog body"),
actions: <Widget>[
// usually buttons at the bottom of the dialog
new FlatButton(
child: new Text("Close"),
onPressed: () {
Navigator.of(context).pop();
},
),
],
);
},
);
}
@override
Widget build(BuildContext context) {
return Container(
);
}
}
