CODEWITHSUNDEEP
flutterflutter-dependenciesflutter-provider
Hosea varghese
Hosea varghese

Reputation: 331

Using singleton vs provider in Flutter?

I'am working on a music player app 📻 in flutter. I'm using audioplayers plugin to get all mp3 files and to play music. I created a separate AudioFunctions class to do all these processes as shown below.

class AudioFunctions{
  FlutterAudioQuery audioQuery;
  AudioPlayer audioPlayer;
  List<SongInfo> songs;

AudioFunctions(){
  this.audioQuery = FlutterAudioQuery();
  this.audioPlayer = AudioPlayer();
  this.songs = [];
}

getLocalSongs() async => this.songs = await audioQuery.getSongs();

String optimiseSongTitles(int index){
  String songTitle = '';

  if (this.songs[index].displayName.contains('-')){
    songTitle = this.songs[index].displayName.split('-')[0];
  }
  else if(this.songs[index].displayName.contains('_')){
    songTitle = this.songs[index].displayName.split('_')[0];
  }

  return songTitle;
}

void playLocalSong(String path){
  audioPlayer.play(path,isLocal: true,);
}

void pauseLocalSong(){
  audioPlayer.pause();
}

Stream<Duration> getLength() {
  return audioPlayer.onDurationChanged;
}

Stream<Duration> getPosition() {
  return audioPlayer.onAudioPositionChanged;
}

Future<int> changeSlider(Duration d){
  return audioPlayer.seek(d);
}

}

Now I can access this class to retrieve relevant data🥳 . Running getLocalSongs saves a list of all local songs to the songs variable in the class. However I have to run this each time I create object of AudioFunctions. So, on each screen.😞

Should I use a singleton or provider? Since I'am new to flutter, I don't know how to work with either of them and I have doubts whether if I can use objects in provider.🤔

Show some love💌 and help out a noob👶

Upvotes: 1

Views: 5986

Answers (1)

josxha
josxha

Reputation: 1227

I think a singleton is a good choice here because you probably don't want to call AudioPlayer() on every page again.

class AudioFunctions {
  static AudioFunctions _instance = AudioFunctions._();
  FlutterAudioQuery audioQuery;
  AudioPlayer audioPlayer;
  List<SongInfo> songs;
  
  static AudioFunctions get instance => _instance;

  AudioFunctions._() {
    this.audioQuery = FlutterAudioQuery();
    this.audioPlayer = AudioPlayer();
    this.songs = [];
  }

  getLocalSongs() async => this.songs = await audioQuery.getSongs();
}

To access AudioFunctions now you can call AudioFunctions.instance. I have changed your constructor to AudioFunctions._() so that it can no longer be called outside the file.

Upvotes: 4

Related Questions