Flutter listview button to create extra children

Issue

I have a listview in a flutter application I am working on, and I want to be able to add extra items to the listview based on when a button is pressed. The button should be below all of the items. I want to add an extra container every time a button is pressed. Ideally, it would be a widget. I am not sure how to do this. Here is my code:

body: ListView(
          children: <Widget>[
            Container(   //this is the container I would like to add another of when a button is pressed
              height: 200,
              child: optionsChoices(),
            ), //end container
            Container(
              height: 200,
              child: optionsChoices(),
            ),
            Container(
              height: 200,
              child: optionsChoices(),
            ),
            Container(
              height: 200,
              child: optionsChoices(),
            ),
          ]
        )

Thanks!

Solution

You can use ListView.builder() to generate the items fro your listview. Store an object or values to a List type variable and pass it to the listview.

Here’s a complete example source:

import 'package:flutter/material.dart';

class Demo extends StatefulWidget {
  @override
  _DemoState createState() => _DemoState();
}

class _DemoState extends State<Demo> {
  List<int> items = [];

  @override
  void initState() {
    items = List.generate(3, (i) {
      // add some dummy items on activity start
      return i;
    });
    super.initState();
  }

  Widget listViewItem({int index}) {
    // widget layout for listview items
    return Container(
        height: 200,
        child:
            Text("$index") // just for the demo, you can pass optionsChoices()
        );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text("DEMO"),
        ),
        body: ListView.builder(
          itemCount: items.length,
          itemBuilder: (context, i) {
            return listViewItem(index: i); // item layout
          },
        ),
        floatingActionButton: FloatingActionButton(
            child: Icon(Icons.add),
            onPressed: () {
              setState(() {
                // add another item to the list
                items.add(items.length);
              });
            }));
  }
}

Answered By – OMi Shah

Answer Checked By – David Marino (FlutterFixes Volunteer)

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