i'm new in Flutter. How do I change the position of the alert dialog in top of Screen in Flutter, I've used align TopCenter but it doesn't work. is there a solution?

this is my code:

 body: Scaffold(
    body: Column(
      crossAxisAlignment: CrossAxisAlignment.center,
      children: <Widget>[
        InkWell(
          onTap: () {
            ErrorAlert(context: context, message: "error message");
          },
          child: Container(
            alignment: Alignment.center,
            padding: EdgeInsets.only(top: appDimens.paddingw6),
            child: Text(
              "Show Dialog",
              style: TextStyle(
                color: Color(0xffFF9900),
              ),
            ),
          ),
        ),
      ],
    ),
  ),
);

This is ErrorAlert widget

    Future<dynamic> ErrorAlert({
  required BuildContext context,
  String? message,
}) {
  return showDialog(
      context: context,
      barrierColor: Colors.white.withOpacity(0),
      barrierDismissible: false,
      builder: (contex) {
        return Align(
          alignment: Alignment.topCenter,
          child: AlertDialog(
            backgroundColor: Color(0xffFFF4F2),
            elevation: 0,
            shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.all(Radius.circular(20.0))),
            content: Container(
              height: 20,
              width: MediaQuery.of(context).size.width - 40,
              child: Row(
                // mainAxisSize: MainAxisSize.min,
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: [
                  Row(
                    children: [
                      Image.asset(
                        "assets/icon/padlock.png",
                        height: 20,
                      ),
                      Text(message ?? "Error",
                          style: TextStyle(color: Color(0xffFC6762))),
                    ],
                  ),
                  Center(
                    child: IconButton(
                     ..........
                    ),
                  ),
                ],
              ),
            ),
          ),
        );
      });
}

this is the result:

CodePudding user response：

Just remove AlertDialog from ErrorAlert function, dialog will be shown as you expected. As we know AlertDialog is a kind of Dialog. So we shouldn't user AlertDialog inside showDialog widget.

 Future<dynamic> ErrorAlert({
        required BuildContext context,
        String? message,
      }) {
        return showDialog(
            context: context,
            barrierColor: Colors.white.withOpacity(0),
            barrierDismissible: false,
            builder: (contex) {
              return Align(
                alignment: Alignment.topCenter,
                child: Material(
                  child:  Container(
                      color: Color(0xffFFF4F2),
                      height: 20,
                      width: MediaQuery.of(context).size.width - 40,
                      child: Row(
                        // mainAxisSize: MainAxisSize.min,
                        mainAxisAlignment: MainAxisAlignment.spaceBetween,
                        children: [
                          Row(
                            children: [
                                Icon(Icons.desktop_mac, color: Colors.blue,),
                              Text(message ?? "Error",
                                  style: TextStyle(color: Color(0xffFC6762))),
                            ],
                          ),
                          Center(
                            child: IconButton(onPressed: () {  }, icon: Icon(Icons.read_more),
                            ),
                          ),
                        ],
                      ),
                    ),
                  ),
              );
            });
      }

CodePudding user response：

You can use insetPadding of AlertDialog, like this:

AlertDialog(
  insetPadding: EdgeInsets.only(bottom: 300),//<---- add this
  backgroundColor: Color(0xffFFF4F2),
  elevation: 0,
  ...
)

Or you can Wrap your AlertDialog with Column like this:

Column(
  mainAxisAlignment: MainAxisAlignment.start,
  children: [
    AlertDialog(
      backgroundColor: Color(0xffFFF4F2),
      elevation: 0,
      ...
    )
  ]
)