I have an issue I don't understand.
Widget build(BuildContext context) {
List<Widget> menuList = menuCategories.map((category) {
return ExpansionTile(
title: CustomExpansionTileHeader(
icon: category.icon,
label: category.label,
),
children: category.children
.map((item) => ListTile(
title: Text(item.label),
onTap: item.onTap,
))
.toList());
}).toList();
print(menuList);
menuList.insert(
0,
DrawerHeader(
child: Text(
'',
style: TextStyle(color: Colors.white, fontSize: 25),
),
decoration: BoxDecoration(
color: Colors.green,
// image: DecorationImage(
// fit: BoxFit.fill,
// image: AssetImage('assets/images/cover.jpg'))),
)));
return Drawer(
child: ListView(padding: EdgeInsets.zero, children: menuList
As you can see I'm trying to create List type Widget withsome ExpansionTile widgets but also add DrawerHeader as index 0. Afterwards, I want to return the list as in Drawer widget in children List.
When I print menuList (before adding DrawerHeader to the list) it prints [ExpansionTile, ExpansionTile, ExpansionTile, ExpansionTile], when I print menuList.runtimeType I get List type ExpansionTile. And this is the part I don't understand. The list was supposed to be List of Widget and it was somehow changed.
This causes crash when I add DrawerHeader to the List as it's different tipe.
If it's important, I'm building Flutter web app.
Please help :)
When you do List<Widget> menuList = menuCategories.map((category) {, specify the type with the generic field. Dart is incorrectly inferring that you want this iterable to be of type ExpansionTile.
Do
List<Widget> menuList = menuCategories.map<Widget>((category) {
to more explicitly tell dart what type you want this to be.