Check if ListView is empty in flutter

Question

Is there a way to check if ListView is empty.

ListView.builder(
  itemCount: _items.length,
  itemBuilder: (context, index) {
    return _buildFilteredItem(context, index);
  },
)

I want to search through my items and if its empty show a Text widget saying no items found. _buildFilteredItem returns null if the item could not be found.

Sunshinesunspot

Answer 1

Check _items before creating ListView

return _items.isEmpty ? Center(child: Text('Empty')) : ListView.builder(
  itemCount: _items.length,
  itemBuilder: (context, index) {
    return _buildFilteredItem(context, index);
  },
)

Spirillum

what if the _items is null? – Steere

If it can be null - you may change _items.isEmpty to (_items?.isEmpty ?? true) – Spirillum

I can't use your above commented code, i have the same Listview.builder to check the list items are null or empty. more errors are pops up. – Steere

locations == null ? Center(child: Text('Empty')) : ListView.builder() seems to be works – Steere

In you example you're checking only for null not for empty. And for empty list you'll get empty screen without placeholder. Could you describe what errors are popping up? – Spirillum

Answer 2

To check for empty list the you can do

ListView.builder(
   itemCount:_items.length, 
   builder:(context, index){ 
      _items.length==0
      ?return Center(child:Text("List is empty"))
      :return _buildFilteredItem(context, index);})

Hypoploid

List builder won't build the widget at all if the item list is empty – Valency