Flutter Error: RangeError (index): Invalid value: Not in range 0..2, inclusive: 3

问题

I am using a long list in flutter. All the items are rendering fine but also following error :

RangeError (index): Invalid value: Not in range 0..2, inclusive: 3

Following is my code :

@override
Widget build(BuildContext context) {
return Container(
  child: getList(),
 );
}

Following is my getList() method :

Widget getList (){
List<String> list = getListItems();
ListView myList = new ListView.builder(itemBuilder: (context, index){
  return new ListTile(
    title: new Text(list[index]),
  );
});
return myList;
}

And following is my getListItem() method:

List<String> getListItems(){
return ["Faizan", "Usman", "Naouman"];
}

Following is the screenshot of error :

回答1:

You should pass the itemCount parameter to the ListView.builder to allow it to know the item count

Widget getList() {
  List<String> list = getListItems();
  ListView myList = new ListView.builder(
    itemCount: list.length,
    itemBuilder: (context, index) {
    return new ListTile(
      title: new Text(list[index]),
    );
  });
  return myList;
}

回答2:

Widget getListView(){
  var itemList = getListElement();
   var list = ListView.builder(
     itemCount: itemList.length,
       itemBuilder:(context, index){
         return ListTile(
           title: Text(itemList[index]),   
         );
         }
   );
   return list;
}

来源：https://stackoverflow.com/questions/53967624/flutter-error-rangeerror-index-invalid-value-not-in-range-0-2-inclusive