drawer_ontap.dart

ListTile(
    title: Text('Item 1'),
    leading: FlutterLogo(),
    onTap: () {
        showDialog(
            context: context,
            builder: (BuildContext context) {
                return _dialog('Tapped Item 1');
            }
        );
    },
    onLongPress: () {
        showDialog(
            context: context,
            builder: (BuildContext context) {
                return _dialog('LongPress');
            }
        );
    },
    selected: true,
),