I am getting a Range Error when using ListView in flutter-CodePudding

Error:

RangeError (index): Invalid value: Not in inclusive range 0..114: 115

I am using ListView where when I am using simple index my code runs fine but when I put index 1 so that I can start with 1 I get the error.

My code is something like this:

Code:

class Main_Index_Page extends StatelessWidget {
  Main_Index_Page({Key? key}) : super(key: key);

  final items = List<String>.generate(115, (i) => "index $i");

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Index Example'),
      ),
      body: ListView.separated(
        padding: const EdgeInsets.all(8),
        itemCount: items.length,
        itemBuilder: (BuildContext context, int index) {
          return ListTile(
            title: Text(items[index 1]),  <---here on this line I get the error.
          );
        },
        separatorBuilder: (BuildContext context, int index) => const Divider(),
      ),
    );
  }
}

CodePudding user response：

As Abdelkrim Bournane said in his answer arrays in dart are zero-based just use Text(items[index]), but if what your are trying to do is skipping first item in the lest and use the rest of it your list will be something like this

ListView.separated(
        padding: const EdgeInsets.all(8),
        itemCount: items.length -1 , // <-----
        itemBuilder: (BuildContext context, int index) {
          return ListTile(
            title: Text(items[index 1]),
          );
        },
        separatorBuilder: (BuildContext context, int index) => const Divider(),
      ),

CodePudding user response：

Why would you use index 1? What's your intention? Array in dart are zero-based, so you should use the index directly without adding 1, like this :

 title: Text(items[index])

CodePudding user response：

Array in dart are starting with zero index only, so if you want to display the text based on index and starts with one then try the following code

//In array declaration

final List.generate(115, (i) => "index ${i 1}");

//While displaying the text just use index not index 1

Text(items[index])