Sample request to an API with Flutter using ASYNC function

TestAPI.dart

import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'dart:convert';

class SongList extends StatefulWidget {
  SongList({Key key}) : super(key: key);

  @override
  _SongListState createState() => _SongListState();
}

class _SongListState extends State<SongList> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("API Test"),
      ),
      body: Container(
        child: FutureBuilder(
          future: getSongs(),
          builder: (context, snapshot) {
            return snapshot.connectionState == ConnectionState.waiting
                ? Container(
                    child: Center(
                    child: CircularProgressIndicator(),
                  ))
                : Column(children: <Widget>[
                    Expanded(
                        child: ListView.builder(
                            shrinkWrap: false,
                            itemCount: snapshot.data.length,
                            itemBuilder: (context, index) {
                              return ListTile(
                                  title: Text(snapshot.data[index].title),
                                  trailing: Icon(Icons.music_note));
                            })),
                  ]);
          },
        ),
      ),
    );
  }

  getSongs() async {
    List<SongAlbum> albums = new List<SongAlbum>();
    var respondBody =
        await http.get('https://jsonplaceholder.typicode.com/albums/');
    for (var data in json.decode(respondBody.body)) {
      SongAlbum album = SongAlbum.fromJson(data);
      albums.add(album);
    }
    return albums;
  }
}

class SongAlbum {
  int id;
  String title;
  SongAlbum({
    this.id,
    this.title,
  });

  SongAlbum copyWith({
    int id,
    String title,
  }) {
    return SongAlbum(
      id: id ?? this.id,
      title: title ?? this.title,
    );
  }

  Map<String, dynamic> toMap() {
    return {
      'id': id,
      'title': title,
    };
  }

  static SongAlbum fromMap(Map<String, dynamic> map) {
    if (map == null) return null;

    return SongAlbum(
      id: map['id'],
      title: map['title'],
    );
  }

  String toJson() => json.encode(toMap());
  factory SongAlbum.fromJson(Map<String, dynamic> json) {
    return SongAlbum(
      id: json['id'],
      title: json['title'],
    );
  }
  @override
  String toString() => 'SongAlbum(id: $id, title: $title)';

  @override
  bool operator ==(Object o) {
    if (identical(this, o)) return true;

    return o is SongAlbum && o.id == id && o.title == title;
  }

  @override
  int get hashCode => id.hashCode ^ title.hashCode;
}