how to refresh ListView.builder flutter

Assuming you've extended the StatefulWidget, you must call setState everytime you change the state. Ex:

setState(() { propList.add('text'); });

Here's a quick example:

import 'package:flutter/material.dart';void main() => runApp(MyApp());class MyApp extends StatelessWidget {  // This widget is the root of your application.  @override  Widget build(BuildContext context) => MaterialApp(home: MyList());}class MyList extends StatefulWidget {  @override  _MyListState createState() => _MyListState();}class _MyListState extends State<MyList> {  List<String> propList = [];  @override  Widget build(BuildContext context) {    return Scaffold(      appBar: AppBar(        title: Text('My List'),      ),      body: ListView.builder(        itemCount: propList.length,        scrollDirection: Axis.horizontal,        shrinkWrap: true,        itemBuilder: (context,index)=> Text(propList[index]),      ),      floatingActionButton: FloatingActionButton(        onPressed: () => setState(() => propList.add('text')),        child: Icon(Icons.add),      ), // This trailing comma makes auto-formatting nicer for build methods.    );  }}