Flutter: How to know item position inside a listview?

Question

I have a list view of items but I would love to know how I can find its current position inside a listview, does anyone know?

What do you mean by position? Index is already there by which you can figure out the position. — Dhrumil Shah - dhuma1981, Apr 15 '19 at 05:26
I think he needs to know the last element visible on the screen. so he can view count like 5/10 — Saifallak, Jun 23 '20 at 13:01

score 2 · Answer 1 · answered Apr 15 '19 at 10:00

2

Use a ListView.builder like this:

ListView.builder(
    itemCount: items.length,
    itemBuilder: (BuildContext context, int index) {
     return new Text('The Position is: $index');
    }
)

The index represents the position of the item.

answered Apr 15 '19 at 10:00

JideGuru

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score 1 · Answer 2 · answered Apr 15 '19 at 11:10

I believe your question does not fall into this situation:

ListView.builder
  (
    itemCount: litems.length,
    itemBuilder: (BuildContext ctxt, int index) {      
     return new Text('my Index is: $index');
    }
  )

But rather on how to know where are you currently scrolled:

I would suggest to follow this article

Expanded(
            child: NotificationListener<ScrollNotification>(
              onNotification: (scrollNotification) {
                // Basically you need something like:
                // final _index = scrollOffset (or position) / item height; 

              },
              child: ListView.builder(
                itemCount: 30,
                itemBuilder: (context, index) {
                  return ListTile(title: Text("Index : $index"));
                },
              ),
            ),
          ),

What if you don't know the height of each item? – user48956 Dec 27 '19 at 00:33 — user48956, Dec 27 '19 at 00:33

Flutter: How to know item position inside a listview?

2 Answers2