just_audio_background 0.0.1-beta.13
just_audio_background: ^0.0.1-beta.13 copied to clipboard
An add-on for just_audio that supports background playback and media notifications.
import 'package:audio_session/audio_session.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:just_audio/just_audio.dart';
import 'package:just_audio_background/just_audio_background.dart';
import 'package:just_audio_example/common.dart';
import 'package:rxdart/rxdart.dart';
Future<void> main() async {
await JustAudioBackground.init(
androidNotificationChannelId: 'com.ryanheise.bg_demo.channel.audio',
androidNotificationChannelName: 'Audio playback',
androidNotificationOngoing: true,
);
runApp(const MyApp());
}
class MyApp extends StatefulWidget {
const MyApp({Key? key}) : super(key: key);
@override
MyAppState createState() => MyAppState();
}
class MyAppState extends State<MyApp> {
static int _nextMediaId = 0;
late AudioPlayer _player;
final _playlist = ConcatenatingAudioSource(children: [
ClippingAudioSource(
start: const Duration(seconds: 60),
end: const Duration(seconds: 90),
child: AudioSource.uri(Uri.parse(
"https://s3.amazonaws.com/scifri-episodes/scifri20181123-episode.mp3")),
tag: MediaItem(
id: '${_nextMediaId++}',
album: "Science Friday",
title: "A Salute To Head-Scratching Science (30 seconds)",
artUri: Uri.parse(
"https://media.wnyc.org/i/1400/1400/l/80/1/ScienceFriday_WNYCStudios_1400.jpg"),
),
),
AudioSource.uri(
Uri.parse(
"https://s3.amazonaws.com/scifri-episodes/scifri20181123-episode.mp3"),
tag: MediaItem(
id: '${_nextMediaId++}',
album: "Science Friday",
title: "A Salute To Head-Scratching Science",
artUri: Uri.parse(
"https://media.wnyc.org/i/1400/1400/l/80/1/ScienceFriday_WNYCStudios_1400.jpg"),
),
),
AudioSource.uri(
Uri.parse("https://s3.amazonaws.com/scifri-segments/scifri201711241.mp3"),
tag: MediaItem(
id: '${_nextMediaId++}',
album: "Science Friday",
title: "From Cat Rheology To Operatic Incompetence",
artUri: Uri.parse(
"https://media.wnyc.org/i/1400/1400/l/80/1/ScienceFriday_WNYCStudios_1400.jpg"),
),
),
AudioSource.uri(
Uri.parse("asset:///audio/nature.mp3"),
tag: MediaItem(
id: '${_nextMediaId++}',
album: "Public Domain",
title: "Nature Sounds",
artUri: Uri.parse(
"https://media.wnyc.org/i/1400/1400/l/80/1/ScienceFriday_WNYCStudios_1400.jpg"),
),
),
]);
int _addedCount = 0;
@override
void initState() {
super.initState();
_player = AudioPlayer();
SystemChrome.setSystemUIOverlayStyle(const SystemUiOverlayStyle(
statusBarColor: Colors.black,
));
_init();
}
Future<void> _init() async {
final session = await AudioSession.instance;
await session.configure(const AudioSessionConfiguration.speech());
// Listen to errors during playback.
_player.playbackEventStream.listen((event) {},
onError: (Object e, StackTrace stackTrace) {
print('A stream error occurred: $e');
});
try {
await _player.setAudioSource(_playlist);
} catch (e, stackTrace) {
// Catch load errors: 404, invalid url ...
print("Error loading playlist: $e");
print(stackTrace);
}
}
@override
void dispose() {
_player.dispose();
super.dispose();
}
Stream<PositionData> get _positionDataStream =>
Rx.combineLatest3<Duration, Duration, Duration?, PositionData>(
_player.positionStream,
_player.bufferedPositionStream,
_player.durationStream,
(position, bufferedPosition, duration) => PositionData(
position, bufferedPosition, duration ?? Duration.zero));
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
home: Scaffold(
body: SafeArea(
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisAlignment: MainAxisAlignment.center,
children: [
Expanded(
child: StreamBuilder<SequenceState?>(
stream: _player.sequenceStateStream,
builder: (context, snapshot) {
final state = snapshot.data;
if (state?.sequence.isEmpty ?? true) {
return const SizedBox();
}
final metadata = state!.currentSource!.tag as MediaItem;
return Column(
crossAxisAlignment: CrossAxisAlignment.center,
children: [
Expanded(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Center(
child:
Image.network(metadata.artUri.toString())),
),
),
Text(metadata.album!,
style: Theme.of(context).textTheme.titleLarge),
Text(metadata.title),
],
);
},
),
),
ControlButtons(_player),
StreamBuilder<PositionData>(
stream: _positionDataStream,
builder: (context, snapshot) {
final positionData = snapshot.data;
return SeekBar(
duration: positionData?.duration ?? Duration.zero,
position: positionData?.position ?? Duration.zero,
bufferedPosition:
positionData?.bufferedPosition ?? Duration.zero,
onChangeEnd: (newPosition) {
_player.seek(newPosition);
},
);
},
),
const SizedBox(height: 8.0),
Row(
children: [
StreamBuilder<LoopMode>(
stream: _player.loopModeStream,
builder: (context, snapshot) {
final loopMode = snapshot.data ?? LoopMode.off;
const icons = [
Icon(Icons.repeat, color: Colors.grey),
Icon(Icons.repeat, color: Colors.orange),
Icon(Icons.repeat_one, color: Colors.orange),
];
const cycleModes = [
LoopMode.off,
LoopMode.all,
LoopMode.one,
];
final index = cycleModes.indexOf(loopMode);
return IconButton(
icon: icons[index],
onPressed: () {
_player.setLoopMode(cycleModes[
(cycleModes.indexOf(loopMode) + 1) %
cycleModes.length]);
},
);
},
),
Expanded(
child: Text(
"Playlist",
style: Theme.of(context).textTheme.titleLarge,
textAlign: TextAlign.center,
),
),
StreamBuilder<bool>(
stream: _player.shuffleModeEnabledStream,
builder: (context, snapshot) {
final shuffleModeEnabled = snapshot.data ?? false;
return IconButton(
icon: shuffleModeEnabled
? const Icon(Icons.shuffle, color: Colors.orange)
: const Icon(Icons.shuffle, color: Colors.grey),
onPressed: () async {
final enable = !shuffleModeEnabled;
if (enable) {
await _player.shuffle();
}
await _player.setShuffleModeEnabled(enable);
},
);
},
),
],
),
SizedBox(
height: 240.0,
child: StreamBuilder<SequenceState?>(
stream: _player.sequenceStateStream,
builder: (context, snapshot) {
final state = snapshot.data;
final sequence = state?.sequence ?? [];
return ReorderableListView(
onReorder: (int oldIndex, int newIndex) {
if (oldIndex < newIndex) newIndex--;
_playlist.move(oldIndex, newIndex);
},
children: [
for (var i = 0; i < sequence.length; i++)
Dismissible(
key: ValueKey(sequence[i]),
background: Container(
color: Colors.redAccent,
alignment: Alignment.centerRight,
child: const Padding(
padding: EdgeInsets.only(right: 8.0),
child: Icon(Icons.delete, color: Colors.white),
),
),
onDismissed: (dismissDirection) {
_playlist.removeAt(i);
},
child: Material(
color: i == state!.currentIndex
? Colors.grey.shade300
: null,
child: ListTile(
title: Text(sequence[i].tag.title as String),
onTap: () {
_player.seek(Duration.zero, index: i);
},
),
),
),
],
);
},
),
),
],
),
),
floatingActionButton: FloatingActionButton(
child: const Icon(Icons.add),
onPressed: () {
_playlist.add(AudioSource.uri(
Uri.parse("asset:///audio/nature.mp3"),
tag: MediaItem(
id: '${_nextMediaId++}',
album: "Public Domain",
title: "Nature Sounds ${++_addedCount}",
artUri: Uri.parse(
"https://media.wnyc.org/i/1400/1400/l/80/1/ScienceFriday_WNYCStudios_1400.jpg"),
),
));
},
),
),
);
}
}
class ControlButtons extends StatelessWidget {
final AudioPlayer player;
const ControlButtons(this.player, {Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Row(
mainAxisSize: MainAxisSize.min,
children: [
IconButton(
icon: const Icon(Icons.volume_up),
onPressed: () {
showSliderDialog(
context: context,
title: "Adjust volume",
divisions: 10,
min: 0.0,
max: 1.0,
stream: player.volumeStream,
onChanged: player.setVolume,
);
},
),
StreamBuilder<SequenceState?>(
stream: player.sequenceStateStream,
builder: (context, snapshot) => IconButton(
icon: const Icon(Icons.skip_previous),
onPressed: player.hasPrevious ? player.seekToPrevious : null,
),
),
StreamBuilder<PlayerState>(
stream: player.playerStateStream,
builder: (context, snapshot) {
final playerState = snapshot.data;
final processingState = playerState?.processingState;
final playing = playerState?.playing;
if (processingState == ProcessingState.loading ||
processingState == ProcessingState.buffering) {
return Container(
margin: const EdgeInsets.all(8.0),
width: 64.0,
height: 64.0,
child: const CircularProgressIndicator(),
);
} else if (playing != true) {
return IconButton(
icon: const Icon(Icons.play_arrow),
iconSize: 64.0,
onPressed: player.play,
);
} else if (processingState != ProcessingState.completed) {
return IconButton(
icon: const Icon(Icons.pause),
iconSize: 64.0,
onPressed: player.pause,
);
} else {
return IconButton(
icon: const Icon(Icons.replay),
iconSize: 64.0,
onPressed: () => player.seek(Duration.zero,
index: player.effectiveIndices!.first),
);
}
},
),
StreamBuilder<SequenceState?>(
stream: player.sequenceStateStream,
builder: (context, snapshot) => IconButton(
icon: const Icon(Icons.skip_next),
onPressed: player.hasNext ? player.seekToNext : null,
),
),
StreamBuilder<double>(
stream: player.speedStream,
builder: (context, snapshot) => IconButton(
icon: Text("${snapshot.data?.toStringAsFixed(1)}x",
style: const TextStyle(fontWeight: FontWeight.bold)),
onPressed: () {
showSliderDialog(
context: context,
title: "Adjust speed",
divisions: 10,
min: 0.5,
max: 1.5,
stream: player.speedStream,
onChanged: player.setSpeed,
);
},
),
),
],
);
}
}