import 'package:sweet_alert_dialogs/sweet_alert_dialogs.dart';

showDialog(
    context: context,
    builder: (BuildContext context) {
       return RichAlertDialog(
          alertTitle: richTitle("Success"),
          alertSubtitle: richSubtitle("This is a Sucess alert"),
          alertType: RichAlertType.SUCCESS,
          actions: <Widget>[
            FlatButton(
              child: Text("OK"),
              onPressed: (){Navigator.pop(context);},
            ),
            FlatButton(
              child: Text("Cancel"),
              onPressed: (){Navigator.pop(context);},
            ),
          ],
       );
    }
);