How to pass onTap Function to ListTile in Flutter?

Question

My Drawer Content:

drawer: Drawer(
    elevation: 0.0,
    child: Container(
      color: kBackgroundColor,
      child: ListView(
        padding: EdgeInsets.zero,
        children: <Widget>[
          DrawerHeader(
            decoration: BoxDecoration(
              color: Colors.grey,
              image: DecorationImage(
                alignment: Alignment.topRight,
                image: AssetImage('images/banner.png'),
                fit: BoxFit.cover,
              ),
            ),
            child: Text('App Test'),
          ),
          ReusableOptionTile(
            textData: 'Home',
            icon: Icons.home,
            onTouch: () {
              print('Home Clicked');
              Navigator.pop(context);
            },
          ),
        ]
      ),
    ),
),

Extracted List Tile Content:

    class ReusableOptionTile extends StatelessWidget {
 const ReusableOptionTile(
      {required this.icon, required this.textData, required this.onTouch});
  final IconData icon;
  final String textData;
  final Function onTouch;

  @override
  Widget build(BuildContext context) {
    return ListTile(
      title: Row(
        children: [
          Icon(icon),
          SizedBox(
            width: 5.0,
          ),
          Text('$textData'),
        ],
      ),
    onTap: onTouch,   // ERROR POINT
    );
  }
}

I Extracted the List Tile from Drawer for making the code more reusable but now unable to pass the on tap function for different tile. at error point it is show error "The argument type 'Function' can't be assigned to the parameter type 'void Function()?'."

How to fix this issue?

Answer 1

onTouch should be extracted as a void function

void onTouch(){
 print('Home Clicked');
 Navigator.pop(context);
}

then

ReusableOptionTile(
            textData: 'Home',
            icon: Icons.home,
            onTouch: onTouch,
          ),

and called

ListTile(
      title: Row(
        children: [
          Icon(icon),
          SizedBox(
            width: 5.0,
          ),
          Text('$textData'),
        ],
      ),
    onTap: onTouch(),
    );