How I can show last 5 elements in widget with listview.builder? Thanks!

if (snapshot.hasData) {
                return ListView.builder(
                  controller: controller,
                  // shrinkWrap: true,
                  // reverse: true,
                  itemCount: snapshot.data!.length ,
                  itemBuilder: (BuildContext context, int index) {
                    // controller.jumpTo(controller.position.maxScrollExtent);
                    if (snapshot.data![index].operatorName == 'barz1' ||
                        snapshot.data![index].operatorName == 'barz2') {
                      return Container(

CodePudding user response：

You can set reverse property true in Listview.builder and set itemcount to 5 to get last 5 elements in widget with ListView.Builder.

ListView.builder(
      reverse: true,
      itemCount: 5,
      itemBuilder: (ctx, index) {
        return Container();
      },
    );

CodePudding user response：

you can use this method

if (snapshot.hasData) {
          final originalList=snapshot.data;
          final newList=originalList.sublist(originalList.length-5, originalList.length);
            return ListView.builder(
              controller: controller,
              // shrinkWrap: true,
              // reverse: true,
              itemCount: newList.length ,
              itemBuilder: (BuildContext context, int index) {
                // controller.jumpTo(controller.position.maxScrollExtent);
                if (newList[index].operatorName == 'barz1' ||
                    newList[index].operatorName == 'barz2') {
                  return Container(

CodePudding user response：

Try this:

if (snapshot.hasData) {
    return ListView.builder(
      controller: controller,
      itemCount: snapshot.data!.length ,
      itemBuilder: (BuildContext context, int index) {
        if(index > snapshot.data!.length - 5){ /// <--- add this condition
           if (snapshot.data![index].operatorName == 'barz1' ||
            snapshot.data![index].operatorName == 'barz2') {
              return Container(...);
           }
        }
      }
    );
 }
                
                  

CodePudding user response：

You can create sublist from original data.

class Fas4 extends StatelessWidget {
  const Fas4({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: FutureBuilder<List<int>>(
        future: Future.value(List.generate(333, (index) => index)),
        builder: (context, snapshot) {
          //handle other state like error...
          if (snapshot.hasData) {
            final data = snapshot.data ?? [];

            List<int> subList =
                data.length <= 5 ? data : data.sublist(data.length - 6);

            return ListView.builder(
              itemCount: subList.length,
              itemBuilder: (context, index) => Text("${subList[index]}"),
            );
          }
          return Text("Loading");
        },
      ),
    );
  }
}