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import 'dart:async';
import 'dart:io';
import 'dart:typed_data';
import 'package:audioplayer/audioplayer.dart';
import 'package:flutter/material.dart';
import 'package:http/http.dart';
import 'package:path_provider/path_provider.dart';
typedef void OnError(Exception exception);
var kUrl = "";
class FlutterAudioPlayer extends StatelessWidget {
String url;
FlutterAudioPlayer(this.url) {
kUrl = url;
}
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: AppBar(
backgroundColor: Colors.blueAccent,
),
body: new AudioApp());
}
}
enum PlayerState { stopped, playing, paused }
class AudioApp extends StatefulWidget {
@override
_AudioAppState createState() => new _AudioAppState();
}
class _AudioAppState extends State<AudioApp> {
Duration duration;
Duration position;
AudioPlayer audioPlayer;
String localFilePath;
PlayerState playerState = PlayerState.stopped;
get isPlaying => playerState == PlayerState.playing;
get isPaused => playerState == PlayerState.paused;
get durationText =>
duration != null ? duration.toString().split('.').first : '';
get positionText =>
position != null ? position.toString().split('.').first : '';
bool isMuted = false;
StreamSubscription _positionSubscription;
StreamSubscription _audioPlayerStateSubscription;
@override
void initState() {
super.initState();
initAudioPlayer();
}
@override
void dispose() {
_positionSubscription.cancel();
_audioPlayerStateSubscription.cancel();
audioPlayer.stop();
super.dispose();
}
void initAudioPlayer() {
audioPlayer = new AudioPlayer();
_positionSubscription = audioPlayer.onAudioPositionChanged
.listen((p) => setState(() => position = p));
_audioPlayerStateSubscription =
audioPlayer.onPlayerStateChanged.listen((s) {
if (s == AudioPlayerState.PLAYING) {
setState(() => duration = audioPlayer.duration);
} else if (s == AudioPlayerState.STOPPED) {
onComplete();
setState(() {
position = duration;
});
}
}, onError: (msg) {
setState(() {
playerState = PlayerState.stopped;
duration = new Duration(seconds: 0);
position = new Duration(seconds: 0);
});
});
}
Future play() async {
await audioPlayer.play(kUrl);
setState(() {
playerState = PlayerState.playing;
});
}
Future _playLocal() async {
await audioPlayer.play(localFilePath, isLocal: true);
setState(() => playerState = PlayerState.playing);
}
Future pause() async {
await audioPlayer.pause();
setState(() => playerState = PlayerState.paused);
}
Future stop() async {
await audioPlayer.stop();
setState(() {
playerState = PlayerState.stopped;
position = new Duration();
});
}
Future mute(bool muted) async {
await audioPlayer.mute(muted);
setState(() {
isMuted = muted;
});
}
void onComplete() {
setState(() => playerState = PlayerState.stopped);
}
Future<Uint8List> _loadFileBytes(String url, {OnError onError}) async {
Uint8List bytes;
try {
bytes = await readBytes(url);
} on ClientException {
rethrow;
}
return bytes;
}
Future _loadFile() async {
final bytes = await _loadFileBytes(kUrl,
onError: (Exception exception) =>
print('_loadFile => exception $exception'));
final dir = await getApplicationDocumentsDirectory();
final file = new File('${dir.path}/audio.mp3');
await file.writeAsBytes(bytes);
if (await file.exists())
setState(() {
localFilePath = file.path;
});
}
@override
Widget build(BuildContext context) {
return new Center(
child: new Material(
elevation: 2.0,
color: Colors.grey[200],
child: new Column(
children: [
Card(child: new Material(child: _buildPlayer())),
localFilePath != null
? new Text(localFilePath)
: new Container(),
])));
}
Widget _buildPlayer() => new Container(
padding: new EdgeInsets.all(16.0),
child: new Column(mainAxisSize: MainAxisSize.min, children: [
new Row(mainAxisSize: MainAxisSize.min, children: [
new IconButton(
onPressed: isPlaying ? null : () => play(),
iconSize: 64.0,
icon: new Icon(Icons.play_arrow),
color: Colors.blueAccent),
new IconButton(
onPressed: isPlaying ? () => pause() : null,
iconSize: 64.0,
icon: new Icon(Icons.pause),
color: Colors.blueAccent),
new IconButton(
onPressed: isPlaying || isPaused ? () => stop() : null,
iconSize: 64.0,
icon: new Icon(Icons.stop),
color: Colors.blueAccent),
]),
duration == null
? new Container()
: new Slider(
value: position?.inMilliseconds?.toDouble() ?? 0.0,
onChanged: (double value) =>
audioPlayer.seek((value / 1000).roundToDouble()),
min: 0.0,
max: duration.inMilliseconds.toDouble()),
new Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
new IconButton(
onPressed: () => mute(true),
icon: new Icon(Icons.headset_off),
color: Colors.blueAccent),
new IconButton(
onPressed: () => mute(false),
icon: new Icon(Icons.headset),
color: Colors.blueAccent),
],
),
new Row(mainAxisSize: MainAxisSize.min, children: [
new Padding(
padding: new EdgeInsets.all(12.0),
child: new Stack(children: [
new CircularProgressIndicator(
value: 1.0,
valueColor: new AlwaysStoppedAnimation(Colors.grey[300])),
new CircularProgressIndicator(
value: position != null && position.inMilliseconds > 0
? (position?.inMilliseconds?.toDouble() ?? 0.0) /
(duration?.inMilliseconds?.toDouble() ?? 0.0)
: 0.0,
valueColor: new AlwaysStoppedAnimation(Colors.blueAccent),
backgroundColor: Colors.yellow,
),
])),
new Text(
position != null
? "${positionText ?? ''} / ${durationText ?? ''}"
: duration != null ? durationText : '',
style: new TextStyle(fontSize: 24.0))
])
]));
}
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