Alert Dialog not shown on button press - flutter

Question

Class for Alert Dialog
class AlertWindow extends StatelessWidget {
final String title;
const AlertWindow({Key key, this.title}) : super(key: key);
#override
Widget build(BuildContext context) {
return Builder(
builder:(BuildContext context) {
return AlertDialog(
title: Text(this.title),
actions: <Widget>[
new FlatButton(
onPressed: (){
Navigator.of(context).pop();
},
child: new Text(
"OK"
)
),
],
);
}
);
}
}
Its been called in a aysnc function like this
Future<ParseUser> SignUP(username, pass, email) async {
var user = ParseUser(username, pass, email); // You can add columns to user object adding "..set(key,value)"
var result = await user.create();
if (result.success) {
setState(() {
_parseUser = user; // Keep the user
});
print(user.objectId);
new AlertWindow(
title: "Signup success " + user.objectId,
);
} else {
print(result.error.message);
new AlertWindow(
title: "Signup error " + result.error.message,
);
}
}
on running this, I can see the print statements in the console, but the AlertWindow doesn't show up.
I've got a hunch that its probably got something to do with the parent BuildContext not been passed to the AlertDialog when I'm creating it.

Answer 1

Try to use function instead of using a widget
Create a new function which return a future
Future<dynamic> _showDialog(BuildContext context){
return showDialog(
context: context,
builder: (BuildContext context) {
return AlertDialog(
title: Text(this.title),
actions: <Widget>[
new FlatButton(
onPressed: (){
Navigator.of(context).pop();
},
child: new Text(
"OK"
)
),
],
);
}
);
}

Answer 2

You need to call the function showDialog for the AlertDialog to appear:
class AlertWindow {
final String title;
final BuildContext context;
const AlertWindow({Key key, this.title, this.context});
void widget(){
showDialog(
context: context,
builder: (BuildContext context) {
return AlertDialog(
title: Text(this.title),
actions: <Widget>[
new FlatButton(
onPressed: (){
Navigator.of(context).pop();
},
child: new Text(
"OK"
)
),
],
);
}
);
}
}
Working example:
https://dartpad.dev/051f787e1737de84609a390d31c36ee0
https://api.flutter.dev/flutter/material/showDialog.html