音频焦点不工作在android 9和android 10 android

Question

int result = audioManager.requestAudioFocus(focusChangeListener,
AudioManager.STREAM_MUSIC,
AudioManager.AUDIOFOCUS_GAIN);
if (result == AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
startMediaPlayer(songPath);
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
audioManager.registerAudioPlaybackCallback(new AudioManager.AudioPlaybackCallback() {
@Override
public void onPlaybackConfigChanged(List<AudioPlaybackConfiguration> configs) {
super.onPlaybackConfigChanged(configs);
boolean isFoundPlayOtherMusic = false;
if (configs.size() > 1) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
if (configs != null) {
for (int i = 0; i < configs.size(); i++) {
if (configs.get(i).getAudioAttributes().getUsage() == USAGE_MEDIA && (configs.get(i).getAudioAttributes().getContentType() == CONTENT_TYPE_MUSIC || configs.get(i).getAudioAttributes().getContentType() == CONTENT_TYPE_UNKNOWN)) {
isFoundPlayOtherMusic = true;
}
}
if (isFoundPlayOtherMusic) {
controls.pauseControl(getApplicationContext());
} else {
if (audioFocus == AudioManager.AUDIOFOCUS_LOSS ||
audioFocus == AudioManager.AUDIOFOCUS_LOSS_TRANSIENT ||
audioFocus == AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK) {
controls.playControl(getApplicationContext());
}
}
}
} else {
controls.pauseControl(getApplicationContext());
}
} else if (configs.size() == 0) {
if (audioFocus == AudioManager.AUDIOFOCUS_LOSS ||
audioFocus == AudioManager.AUDIOFOCUS_LOSS_TRANSIENT ||
audioFocus == AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK)
controls.playControl(getApplicationContext());
}
}
}, handler);
}

这里是检查音频管理器的音频焦点的代码，是音频管理器获得成功焦点然后播放音乐播放器的代码，我还实现了audioChangeFocusListener，如下代码所示。

private AudioManager.OnAudioFocusChangeListener focusChangeListener =
new AudioManager.OnAudioFocusChangeListener() {
public void onAudioFocusChange(int focusChange) {
switch (focusChange) {
case AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK:
System.out.println("===== AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK : " + focusChange);
break;
case AudioManager.AUDIOFOCUS_GAIN_TRANSIENT:
System.out.println("===== AUDIOFOCUS_GAIN_TRANSIENT : " + focusChange);
break;
case AudioManager.AUDIOFOCUS_GAIN:
System.out.println("===== AUDIOFOCUS_GAIN : " + focusChange);
if (!mp.isPlaying())
controls.playControl(getApplicationContext());
break;
case AudioManager.AUDIOFOCUS_LOSS:
System.out.println("===== AUDIOFOCUS_LOSS : " + focusChange);
if (mp.isPlaying())
controls.pauseControl(getApplicationContext());
break;
case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
System.out.println("===== AUDIOFOCUS_LOSS_TRANSIENT : " + focusChange);
if (mp.isPlaying())
controls.pauseControl(getApplicationContext());
break;
case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
System.out.println("===== AUDIOFOCUS_LOSS : " + focusChange);
}
}
};

Audio Focus在android 9和10中都不起作用。我正在我的应用程序中使用带通知的音频播放。

音频焦点而不是我们应用程序中的增益和损失，当从其他应用程序播放音频时，是否可以停止我们的应用程序音乐，当我在我的应用程序中播放音频，然后停止其他应用程序的其他音乐播放器，然后如何停止？

Answer 1

这对我来说也是一个痛苦的话题。试着添加播放伪音频https://stackoverflow.com/a/50678833

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
AudioTrack audioTrack = new AudioTrack(
new AudioAttributes.Builder()
.setUsage(AudioAttributes.USAGE_MEDIA)
.setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
.build(),
new AudioFormat.Builder()
.setChannelMask(AudioFormat.CHANNEL_OUT_STEREO)
.setSampleRate(48000)
.setEncoding(AudioFormat.ENCODING_PCM_16BIT)
.build(),
AudioTrack.getMinBufferSize(48000, AudioFormat.CHANNEL_OUT_STEREO, AudioFormat.ENCODING_PCM_16BIT),
AudioTrack.MODE_STREAM,
AudioManager.AUDIO_SESSION_ID_GENERATE
);
audioTrack.play();
audioTrack.stop();
audioTrack.release();
}