Flutter type 'List<dynamic>' is not a subtype of type 'List<String>'

Question

I have this widget

StreamBuilder(
        stream:
            FirebaseFirestore.instance.collection('HouseDetails').snapshots(),
        builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
          if (!snapshot.hasData) {
            return Center(
              child: CircularProgressIndicator(),
            );
          }
          return Expanded(
            child: ListView(
              children: snapshot.data.docs.map<Widget>((document) {
                return _buildHouse(context, document);
              }).toList(),
              physics: BouncingScrollPhysics(),
            ),
          );
        });

Now the _buildHouse builds a basic screen which has an onTap functionality. I am passing the QueryDocumentSnapshot document to another screen using MaterialPageRoute.

 onTap: () {
        Navigator.push(
          context,
          MaterialPageRoute(
            builder: (_) => DetailsScreen(house: document),
          ),
        );
      },

the line builder: (_) => DetailsScreen(house: document), throws the error

The following _TypeError was thrown building DetailsScreen(dirty, state: _DetailsScreenState#cc47a):
I/flutter ( 5479): type 'List<dynamic>' is not a subtype of type 'List<String>'
I/flutter ( 5479): The relevant error-causing widget was:
 I/flutter ( 5479):   DetailsScreen

What goes wrong here?

Suraj M · Accepted Answer · 2021-04-29 14:34:36Z

1

I just had to use .map<String>((e)=>e.toString()).toList() inside the DetailsScreen class where the variables of the type List<String> .

answered Apr 29, 2021 at 14:34

Suraj M

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Comments

Noah · Accepted Answer · 2021-04-29 15:59:01Z

0

I always got that error when setting a list like this: List testList;

Often it's solved by just doing List testList = []; or List testList = new List;

answered Apr 29, 2021 at 15:59

Noah

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1 Comment

Suraj M Over a year ago

This happens as you have not initialized your list yet.

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