[Flutter] countdown/countup string timer in showDialog/Dialog

everything is working but just the show dialog or dialog box cannot update the timer or cannot show the updating countdown or count up timer. And I have used just method not classes becuase I want to show the timer in front of all widgets in the screen.

here is the code:

void showFrostedGlassBox(BuildContext context, String timer) {
showDialog(
context: context,
barrierDismissible: false, // Allows dismissing by tapping outside
builder: (BuildContext context) {
return Center(child: testing(timer, context),);
},
);
}

Widget testing(String timer, BuildContext context) {
return Stack(
children: [
Container(
width: 200,
height: 200,
decoration: BoxDecoration(
...
),
child: Text(
timer,
style: TextStyle(
...
),
),
),
),
// close button

],
);
}


some data exists but not working in this case.

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