example

import 'package:flutter/material.dart';

import 'dart:async';

void main() => runApp(new MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Flutter Demo',
      theme: new ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: new MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  HomeState createState() => HomeState();
}

class HomeState extends State<MyHomePage> {
  List<String> listOne;

  @override
  void initState() {
    super.initState();
    listOne = [];
  }

  Future<List<String>> getList() async {
    return ["1", "2", "3", "4", "5", "6", "7", "8", "9", "10"];
  }


  Future setList() async {
    listOne = await getList();
    setState(() {});
  }
  //try removing setState and adding a more items to the list.

  @override
  Widget build(BuildContext context) {
    setList();
    return Scaffold(
        body: Center(
      child: ListView(
        children: listOne
            .map((i) => ListTile(
                  title: Text(i),
                ))
            .toList(),
      ),
    ));
  }
}