Hey Nasar Ali,
Currently Flutterflow does not have this functionality in built but you can achieve this using custom actions.

First create a custom action named \"showLoader\" or whatever you would like to name it.
Then check the Include BuildContext option, and add a argument which will be responsible for the timeout in which your back button will not work.
Now you can copy the boilerplate code and paste the given below code snippet
here is the code:

Future showLoader(\n  BuildContext context,\n  int? duration,\n) async {\n // Add your function code here!\n  showDialog(\n    context: context,\n    barrierDismissible: false,\n    barrierColor: Colors.black.withOpacity(0.4),\n    builder: (BuildContext context) {\n      return WillPopScope(\n        onWillPop: () async => false,\n        child: Center(\n          child: CircularProgressIndicator(),\n        ),\n      );\n    },\n  );\n  await Future.delayed(Duration(seconds: duration ?? 10), () {\n    Navigator.of(context).pop();\n  });\n}\n\n

and here is how, it will look like
Hope it works for you.
Happy Coding :)
[NC]

Disable Android Back Button