Why variable value is not refreshing in flutter?

Question

The variable value is not refreshing in flutter(which I created outside the class). The following way I have added.So in button press am setting different value. So if I come back to that screen again it is not showing 1. May I know why it is happening?

int _currVal = 1;

class AskFragment extends StatefulWidget {
  static const String routeName = "//";
  static const
  int currState = -1;

  @override
  HomeScreenState createState() => HomeScreenState();
}

variables change state inside a StatefulWidget, if you want to change that value, use the method setState(). You're using a global variable that way and you won't get the updated value when changed. — Mariano Zorrilla, Feb 18 '20 at 16:35
@MarianoZorrilla yeah it is global value only. Am using an Alert dialog in that am setting the value. Am getting the value. But the problem is what ever I got the last value it is remains state. if I come back to the particular screen — Sunisha Guptan, Feb 18 '20 at 16:40
initialize the value inside the class and update the value in setState((){}); :- read this document :- https://api.flutter.dev/flutter/widgets/StatefulWidget-class.html — Yogesh Chawla, Feb 18 '20 at 17:12
Let us [continue this discussion in chat](https://chat.stackoverflow.com/rooms/208103/discussion-between-sunisha-sindhu-and-yogesh-chawla). — Sunisha Guptan, Feb 19 '20 at 06:28

score 4 · Accepted Answer · answered Feb 19 '20 at 06:26

To update the values, use Stateful Widget and initialise values inside that Widget only, for any updates in the values of variables mention that in setState((){}) method to notify the change in the values.

See this for documentation of stateful widgets

See this for documentation of setState((){}) method

setState(() { _myVariable = newValue });

Note:- Never initialise changing values in build method they will not get updated instead they will be reinitialised with same values again and again

Your "Note" part saved my day, thanks! – Tal Haham Feb 25 '23 at 11:52 — Tal Haham, Feb 25 '23 at 11:52

Why variable value is not refreshing in flutter?

1 Answers1

Linked