Example of fluttet app for play Songs

main.dart

import 'package:flutter/material.dart';
import 'package:sales_force/screens/tony/songs.dart';
import 'screens/home/home_screen.dart';


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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.deepOrange,
      ),
      home: Songs(),
    );
  }
}

pubspec.yaml

name: sales_force
description: A new Flutter project.

# The following defines the version and build number for your application.
# A version number is three numbers separated by dots, like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in flutter
# build by specifying --build-name and --build-number, respectively.
# In Android, build-name is used as versionName while build-number used as versionCode.
# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
# In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
# Read more about iOS versioning at
# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
version: 1.0.0+1

environment:
  sdk: ">=2.1.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter
  audioplayers: ^0.13.2

  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^0.1.2

dev_dependencies:
  flutter_test:
    sdk: flutter


# For information on the generic Dart part of this file, see the
# following page: https://dart.dev/tools/pub/pubspec

# The following section is specific to Flutter.
flutter:

  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the material Icons class.
  uses-material-design: true

  # To add assets to your application, add an assets section, like this:
  assets:
    - assets/
  #  - images/a_dot_burr.jpeg
  #  - images/a_dot_ham.jpeg

  # An image asset can refer to one or more resolution-specific "variants", see
  # https://flutter.dev/assets-and-images/#resolution-aware.

  # For details regarding adding assets from package dependencies, see
  # https://flutter.dev/assets-and-images/#from-packages

  # To add custom fonts to your application, add a fonts section here,
  # in this "flutter" section. Each entry in this list should have a
  # "family" key with the font family name, and a "fonts" key with a
  # list giving the asset and other descriptors for the font. For
  # example:
  # fonts:
  #   - family: Schyler
  #     fonts:
  #       - asset: fonts/Schyler-Regular.ttf
  #       - asset: fonts/Schyler-Italic.ttf
  #         style: italic
  #   - family: Trajan Pro
  #     fonts:
  #       - asset: fonts/TrajanPro.ttf
  #       - asset: fonts/TrajanPro_Bold.ttf
  #         weight: 700
  #
  # For details regarding fonts from package dependencies,
  # see https://flutter.dev/custom-fonts/#from-packages

songs.dart

import 'package:audioplayers/audio_cache.dart';
import 'package:audioplayers/audioplayers.dart';
import 'package:flutter/material.dart';

//https://medium.com/@pongpiraupra/a-comprehensive-guide-to-playing-local-mp3-files-with-seek-functionality-in-flutter-7730a453bb1a

class Songs extends StatefulWidget {
  _SongsState createState() => _SongsState();
}


class _SongsState extends State<Songs> {

  AudioPlayer audioPlayer = AudioPlayer(mode: PlayerMode.LOW_LATENCY);
  AudioCache audioCache = AudioCache();


  @override
  Widget build(BuildContext context) {
    return Scaffold(

      appBar: AppBar(
        backgroundColor: Colors.deepOrange,
        title: Text('Flutter >> Xamarin'),
      ),

      body: Container(
        decoration: BoxDecoration(
          color: Colors.black,
          image: DecorationImage(
            // image: NetworkImage('https://pbs.twimg.com/media/D7w1Z7qWsAUqY0y.jpg'),
            image: NetworkImage('https://i.pinimg.com/originals/47/77/2f/47772fe1b513dfad3789ddf0facff2e4.jpg'),
            fit: BoxFit.cover,
            colorFilter: ColorFilter.mode(Colors.black.withOpacity(1), BlendMode.color)
          ),
        ),

        child: ListView.separated(
          itemCount: 10,
          itemBuilder: (context, index) {
            return ListTile(
              title: Text('Música $index.mp3', style: TextStyle(color: Colors.white),),
              onTap: () async {
                //monsterslap.mp3
                if(index %2 == 0) {
                   int result = await audioPlayer.play('http://www.evidenceaudio.com/wp-content/uploads/2014/10/lyricchords.mp3');
                  print(result);
                }else {
                  audioCache.play('monsterslap.mp3');
                }               
              },
            );
          },
          separatorBuilder: (context, index) => Divider(color: Colors.white,),
        ),
      ),
    );
  }
}