I can't access specific value store flutter-CodePudding

I had this problem where I couldn't access specific value and rather print everything out. I finger why it does that and though I post about it maybe it help someone.

I couldn't access specific value.

@override
void initState() {
  /*get data*/
  getData();
  userId = FirebaseAuth.instance.currentUser!.uid;
  super.initState();
}

getData() async {

  try {
    if (widget.listId != null) {
      var userSnap = await FirebaseFirestore.instance
          .collection('Lists')
          .doc(widget.listId)
          .get();

      setState(() {
        listData = userSnap.data()!;
        _isloaded = true;
      });
    }
  } catch (e) {
    print(e.toString());
  }
}

var userId;//the user visiting the page
var listData = {};
bool _isloaded  =false;

here where it went wrong:

 Text(
     "$listData['Title']",
  ),

The output:

{uid: 8qqfIvsJ5fbkdOEeyrqiunYCBw52, Description: , Cover: , ListID: c79697b0-296e-11ed-8a73-b9da6639ae48, Access: true, Title: K, Tags: []}['Title']

solution

I shouldn't but it in "" and just write it without like this:

 Text(
     listData['Title'],
 ),

The output:

CodePudding user response：

Please replace

Text(
  "$listData['Title']",
),

With

Text(
  "${listData['Title']}",
),

You can read about string interpolation here.