[Solved] type ‘List‘ is not a subtype of type ‘List‘ in Flutter

Hello Guys, How are you all ? Hope you all are fine. Today I have faced type ‘List’ is not a subtype of type ‘List’ this error where I Use in my Flutter Firebase Project.

How type ‘List’ is not a subtype of type ‘List’ in Flutter error occur?

I have Used Firestore Example in My Flutter Project. When I run my flutter app. But I get this error in my Console.

I am using This Below Code Where I Got Error.

          children: snapshot.data.documents.map((document) {
            return new ListTile(
              title: new Text(document['name']),
              subtitle: new Text("Class"),
            );
          }).toList()

I get this below error

type 'List<dynamic>' is not a subtype of type 'List<Widget>'

Here I am Come with all Possible Solution. So let’s Start this tutorial without wasting your Time. Let’s start this article.

How to solve type ‘List’ is not a subtype of type ‘List’ in Flutter error?

Solution 1 : Provide type argument to the map method.

Problem is that type inference fails in an unexpected way. The solution is to provide a type argument to the map method.

For Example:

snapshot.data.documents.map<Widget>((document) {
  return new ListTile(
    title: new Text(document['name']),
    subtitle: new Text("Class"),
  );
}).toList()

Because of map is followed by toList and because there is no way to type annotate the return of a closure.

This Solution Worked for me. hope it will also work for you.

Solution 2 : Converting Map to Widget

Here I am solving this error by converting Map to Widget.

      children: snapshot.map<Widget>((data) => 
               _buildListItem(context, data)).toList(),

Solution 3 : Cast dynamic List to List With specific Type

We can Cast dynamic List to List With specific Type:

List<'YourModel'>.from(_list.where((i) => i.flag == true));

So Hope This Above 3 Solution Will Work For You Too. So it’s all About type ‘List’ is not a subtype of type ‘List’ in Flutter error. Hope this tutorial helped you a lot. Comment below Your thoughts and your queries. And Also Comment on your suggestion here.

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