How to disable onBackPressed() for AlertDialog flutter

Question

I've got an AlertDialog() that it's barrierDismissible has been set to false. But yet when user presses the back button on android device the AlertDialog closes. How can I compeletly prevent the user from closing the AlertDialog()?

Here's what I've done so far:

          return showDialog<bool>(
            context: context,
            barrierDismissible: false,
            builder: (BuildContext context) {
              return AlertDialog(
                title: Text('Title'),
                content: Text('This is the alert dialog content'),
                actions: <Widget>[
                  FlatButton(
                    child: Text('ok'),
                    onPressed: () {
                      Navigator.of(context).pop();
                      print('ok you win');
                    },
                  ),
                ],
              );
            },
          );

Answer 1

You can use the WillPopScope as a parent of the AlertDialog

  showDialog(context: context,builder: (BuildContext context)
          {
              return WillPopScope(
                onWillPop: () async =>false,
                              child: AlertDialog(
                  title: Text('Title'),
                  content: Text('Sample'),
                  actions: <Widget>[
                    FlatButton(
                      child: Text('ok'),
                      onPressed: (){
                        Navigator.of(context).pop();
                      },
                    )
                  ],
                ),
              );

Answer 2

Try this way use WillPopScope() to handle onBackPressed() event

showDialog(
                            context: context,
                            barrierDismissible: false,
                            builder: (BuildContext context) {
                              return WillPopScope(
                                onWillPop: () {return Future.value(false);},
                                child:  return AlertDialog(
                title: Text('Title'),
                content: Text('This is the alert dialog content'),
                actions: <Widget>[
                  FlatButton(
                    child: Text('ok'),
                    onPressed: () {
                      Navigator.of(context).pop();
                      print('ok you win');
                    },
                  ),
                ],
              ),
                              );
                            });