Type 'List<Widget?>' is not a subtype of type 'List<Widget>'

Question

I'm using connectivity_wrapper: ^1.0.6 in flutter application. while passing child to connectivity_wrapper it generates an error type 'List<Widget?>' is not a subtype of type 'List' in type cast I have googled it but not able to find any solution. and also want to know the difference between List<Widget?> and 'List.

@override
Widget build(BuildContext context) {
return Scaffold(
  appBar: appBarCustom(
    onBackTap: onBackTab,
    color: Colors.black,
    title: Strings.appName,
    textStyle: TextStyles.appBarBold,
    actions: [
      C0(),
    ],
  ),
  body: ConnectivityWidgetWrapper(
    child: ListView(
      children: <Widget>[
        ListTile(
          title: Text("EX1"),
          onTap: () {

          },
        ),
        Divider(),
        ListTile(
          title: Text("EX@"),
          onTap: () {

          },
        ),
        Divider(),
      ],
    ),
  ),
);
}

Error: type 'List<Widget?>' is not a subtype of type 'List' in type cast

You are giving a list that is null. It's the null safety question mark. — mario francois
– mario francois, Commented Nov 21, 2021 at 11:32

Z-Soroush · Accepted Answer · 2021-11-21 11:31:46Z

2

there is an issue in github.so track that issue to solve your problem. it's all about null safety.

answered Nov 21, 2021 at 11:31

Z-Soroush

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5 Comments

Z-Soroush Over a year ago

it's my pleasure.

BC TUBE Over a year ago

How we can handle it without removing "?" and adding child! to the connectivity_wrapper class?

Z-Soroush Over a year ago

you can disable null safety in your flutter.flutter run --no-sound-null-safety

Z-Soroush Over a year ago

or you can use another version of the package. and look at docs here: dart.dev/null-safety/unsound-null-safety

BC TUBE Over a year ago

Sure will read.

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