CODE EXAMPLE FOR DART

custom dialog box in flutter

Future<void> _showMyDialog() async {
  return showDialog<void>(
  context: context,
  barrierDismissible: false, // user must tap button!
  builder: (BuildContext context) {
    return AlertDialog(
      title: Text('AlertDialog Title'),
      content: SingleChildScrollView(
        child: Column(
          children: <Widget>[
            Text('This is a demo alert dialog.'),
            Text('Would you like to confirm this message?'),
          ],
        ),
      ),
      actions: <Widget>[
        TextButton(
          child: Text('Confirm'),
          onPressed: () {
            print('Confirmed');
            Navigator.of(context).pop();
          },
        ),
        TextButton(
          child: Text('Cancel'),
          onPressed: () {
            Navigator.of(context).pop();
          },
        ),
      ],
    );
  },
);
}