audio_player_util.dart
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import 'package:audioplayers/audioplayers.dart';
import 'package:flutter/cupertino.dart';
import 'package:wow_english/common/extension/string_extension.dart';
import 'log_util.dart';
enum AudioPlayerUtilType {
welcomeToWow('welcome_to_wow'),
classTime('class_time'),
gameTime('game_time'),
musicTime('music_time'),
readingTime('reading_time'),
videoTime('video_time'),
quizTime('quiz_time'),
countWithMe('count_with_me_instrumental'),
inMyTummy('in_my_tummy_instrumental'),
touch('touch_instrumental'),
excellent('excellent'),
great('great'),
good('good'),
tryAgain('try_again'),
right('right'),
wrong('wrong');
const AudioPlayerUtilType(this.path);
final String path;
}
class AudioPlayerUtil extends WidgetsBindingObserver {
static AudioPlayerUtil? _instance;
late AudioPlayer _audioPlayer;
late AudioPlayerUtilType currentType;
bool _wasPlaying = false;
static const TAG = "AudioPlayerUtil";
// 私有构造函数
AudioPlayerUtil._internal() {
// 监听应用生命周期
WidgetsBinding.instance.addObserver(this);
_audioPlayer = AudioPlayer();
_audioPlayer.onPlayerStateChanged.listen((event) async {
if (event == PlayerState.completed) {
// 播放结束再次播放
if (currentType == AudioPlayerUtilType.inMyTummy) {
AudioPlayerUtil.getInstance()
.playAudio(AudioPlayerUtilType.inMyTummy);
}
if (currentType == AudioPlayerUtilType.countWithMe) {
AudioPlayerUtil.getInstance()
.playAudio(AudioPlayerUtilType.countWithMe);
}
if (currentType == AudioPlayerUtilType.touch) {
AudioPlayerUtil.getInstance().playAudio(AudioPlayerUtilType.touch);
}
}
});
}
static AudioPlayerUtil getInstance() {
_instance ??= AudioPlayerUtil._internal();
return _instance!;
}
// 播放音频
Future<void> playAudio(AudioPlayerUtilType type) async {
Log.d("$TAG playAudio $type");
currentType = type;
String path = type.path;
await _audioPlayer.play(AssetSource(path.assetMp3), volume: 0.5);
await _audioPlayer.onPlayerComplete.first;
}
// stop
Future<void> stop() async {
Log.d("$TAG stop _audioPlayer.state=${_audioPlayer.state}");
await _audioPlayer.stop();
}
// pause
Future<void> pause() async {
Log.d("$TAG pause _audioPlayer.state=${_audioPlayer.state}");
if (_audioPlayer.state == PlayerState.playing) {
await _audioPlayer.pause();
}
}
// resume
Future<void> resume() async {
Log.d("$TAG resume _audioPlayer.state=${_audioPlayer.state}");
if (_audioPlayer.state == PlayerState.paused) {
await _audioPlayer.resume();
}
}
@override
void didChangeAppLifecycleState(AppLifecycleState state) async {
Log.d("$TAG didChangeAppLifecycleState appState=$state _wasPlaying=$_wasPlaying _audioPlayer.state=${_audioPlayer.state}");
if (state == AppLifecycleState.paused) {
if (_audioPlayer.state == PlayerState.playing) {
_wasPlaying = true;
await pause();
};
} else if (state == AppLifecycleState.resumed) {
if (_wasPlaying == true) {
_wasPlaying = false;
await resume();
}
}
}
void dispose() {
Log.d("$TAG dispose _audioPlayer.state=${_audioPlayer.state}");
_audioPlayer.dispose();
WidgetsBinding.instance.removeObserver(this);
}
}