“铃声管理器：无法找到可用的铃声”持续性错误
我们应用程序的一些用户报告铃声无法按预期加载。我在下面列出了其中一位用户的典型 logcat 输出。似乎对默认铃声的请求返回 null（“无法打开铃声内容://settings/system/ringtone”）。我已要求这些用户更改铃声，有时这可以解决问题，但在其他情况下（我所知道的 HTC Hero）更改铃声并不能解决问题。我无法在我们的任何测试设备上重现此问题。关于可能导致此问题的原因、如何调试或如何解决有什么想法吗？
D/Ringtone( 743): create mAudio
D/MediaPlayer( 743): setDataSource(44, 0, 576460752303423487) pid = 743
E/Mp3HwPlayer( 56): ID:24, new Mp3HwPlayer
E/MediaPlayerService( 56): getPlayerType(): Has ID3 info, size = 1024
E/MediaPlayerService( 56): getPlayerType(): Input buffer is MPA format
E/Mp3HwPlayer( 56): ID:24, destory Mp3HwPlayer
D/MediaPlayerService( 56): Create Player playertype=6
D/MediaPlayerService( 56): new PVPlayer for MP3
D/PVPlayer( 56): setDataSource(25, 0, 180143)
D/MediaPlayerService( 56): MediaPlayerService::Client::setDataSource exit
D/MediaPlayerService( 56): returned from setDataSource() in MediaPlayerService::create
D/MediaPlayerService( 56): [23] prepareAsync
I/PlayerDriver( 56): OpenCore disable firewall payload
W/MediaPlayer( 743): info/warning (1, 26)
E/PlayerDriver( 56): Command PLAYER_PREPARE completed with an error or info PVMFErrResource
E/MediaPlayer( 743): error (1, -17)
E/RingtoneManager( 743): Failed to open ringtone content://settings/system/ringtone
E/RingtoneManager( 743): unable to find a usable ringtone
E/IncomingRinger( 743): Couldn't find a ringtone for URI: content://settings/system/ringtone
Some users of our app are reporting that ringtones fail to load as expected. I've included a typical logcat output from one of these users below. It seems that the request for the default ringtone is returning null ("Failed to open ringtone content://settings/system/ringtone"). I've asked these users to change ringtones, and sometimes this resolves the issue, but in other cases (HTC Hero in both the ones I know of) changing the ringtone does not fix the problem. I have been unable to reproduce this problem on any of our test devices. Any thoughts as to what might cause this, how to debug, or how to resolve?
D/Ringtone( 743): create mAudio
D/MediaPlayer( 743): setDataSource(44, 0, 576460752303423487) pid = 743
E/Mp3HwPlayer( 56): ID:24, new Mp3HwPlayer
E/MediaPlayerService( 56): getPlayerType(): Has ID3 info, size = 1024
E/MediaPlayerService( 56): getPlayerType(): Input buffer is MPA format
E/Mp3HwPlayer( 56): ID:24, destory Mp3HwPlayer
D/MediaPlayerService( 56): Create Player playertype=6
D/MediaPlayerService( 56): new PVPlayer for MP3
D/PVPlayer( 56): setDataSource(25, 0, 180143)
D/MediaPlayerService( 56): MediaPlayerService::Client::setDataSource exit
D/MediaPlayerService( 56): returned from setDataSource() in MediaPlayerService::create
D/MediaPlayerService( 56): [23] prepareAsync
I/PlayerDriver( 56): OpenCore disable firewall payload
W/MediaPlayer( 743): info/warning (1, 26)
E/PlayerDriver( 56): Command PLAYER_PREPARE completed with an error or info PVMFErrResource
E/MediaPlayer( 743): error (1, -17)
E/RingtoneManager( 743): Failed to open ringtone content://settings/system/ringtone
E/RingtoneManager( 743): unable to find a usable ringtone
E/IncomingRinger( 743): Couldn't find a ringtone for URI: content://settings/system/ringtone
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看起来铃声存储在SD卡上，并且您没有权限读取SD数据，因此返回null。我的媒体播放器也遇到类似的问题。
It looks like the ringtone is stored on a SD card, and you haven't permission to read SD data, so it returns null. I got similar problem with my mediaPlayer.