Flutter ListView: widgets doesn't update

Question

I have a listview that shows some items, inside a StatefulWidget :

  ListView.separated(
      shrinkWrap: true,
      itemBuilder: (context, index) {
          return RowItem(
              item: rowsList[index],
              index: index,
          );
      },
      separatorBuilder: (context, index) {
          return Divider(
              height: 20,
              color: Colors.transparent,
          );
      },
      itemCount: rowsList.length,
  ),

RowItem is a StatefulWidget too.

Everithing works fine when i add and remove items from rowsList, but i'm facing problems when i try to update an existing RowItem. This is my function for update:

  void updateRow(int rowIndex, MyItem item) {
    setState(() {
       rowsList[rowIndex] = item;
    });
  }

but i still see inside listview the old values for updated item. (MyItem is an object that extends Equatable).

What's wrong?

Try using [keys](https://medium.com/flutter/keys-what-are-they-good-for-13cb51742e7d). — Riwen, May 17 '21 at 09:23
Does it solve your issue? If so, I'm reposting my comment as an actual answer. — Riwen, May 17 '21 at 09:39

score 0 · Answer 1 · answered May 17 '21 at 09:20

try RowItem widget try this

var item;

 @override
   void initState() {
    item = widget.item;
      super.initState();
    }
@override
  void didUpdateWidget(covariant SleepDeckStepper oldWidget) {
    item = widget.item;
    super.didUpdateWidget(oldWidget);
  }

problem is item parameter is not updating for RowItem

score 0 · Answer 2 · answered May 17 '21 at 20:52

0

Reposting my comment. You should use a Key on each RowItem.

Flutter ListView: widgets doesn't update

2 Answers2