CODEWITHSUNDEEP
flutterdart
rameez khan
rameez khan

Reputation: 359

Flutter how to show data from class

I have created a class like this

class Collection with ChangeNotifier {
  List<Items> _items = [];

  void addData(Items day) {
    print(day.name);
    print(day.id);
    _items.add(day);
    print(_items);
    notifyListeners();
  }
}

class Items { 
  String name;
  String comments;
  int id;
  Items({required this.name, required this.comments, required this.id});
}

I am inserting data in _items like this

 Collection().addData(Items(name: "a", comments: "sda", id: 12));

I can see on addData function its printing values correctly

but when i am showing this in my widget its not showing

   ListView.builder(
                itemCount: Collection()._items.length,
                itemBuilder: (BuildContext context, int index) {
                  print(Collection()._items.length);
                  return Text('name ${Collection()._items[index].name} id ${Collection()._items[index].id}');
                })

Upvotes: 0

Views: 802

Answers (1)

Rob Lyndon
Rob Lyndon

Reputation: 12651

Each time you call the Collection() constructor, you're making a different instance of the Collection class. You need to create an instance using

final collection = Collection();

And then use that object in your builder.

It is better to use final than var, because that ensures that the collection object won't get reassigned to a new instance.

Upvotes: 2

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