偶尔，与ScheduledExecutorService一起使用的Android SoundPool会停止播放声音

Question

在我的手机和模拟器上，这似乎发生了15次中的1次。音响池将播放声音约3秒，然后停止。当我播放声音时，我反复得到这个消息，我理解这只是意味着不能使用低延迟模式。当声音停止时，不再产生这些警告。

    W/AudioTrack: AUDIO_OUTPUT_FLAG_FAST denied by client

    07-09 22:14:15.630 2601-2890/? I/AudioPolicyManager: stopOutput() output 2, stream 7, session 7935
    07-09 22:14:15.630 2601-2890/? I/AudioPolicyManager: stopOutput() output 2, stream 7, session 7928
    07-09 22:14:15.750 2601-2890/? I/AudioPolicyManager: stopOutput() output 2, stream 7, session 7936
    07-09 22:14:15.750 2601-2890/? I/AudioPolicyManager: stopOutput() output 2, stream 7, session 7937
    07-09 22:14:15.870 2601-2890/? I/AudioPolicyManager: stopOutput() output 2, stream 7, session 7938
    07-09 22:14:16.130 2601-2890/? I/AudioPolicyManager: stopOutput() output 2, stream 7, session 7939
    07-09 22:14:16.130 2601-2890/? I/AudioPolicyManager: stopOutput() output 2, stream 7, session 7940
    07-09 22:14:16.250 2601-2890/? I/AudioPolicyManager: stopOutput() output 2, stream 7, session 7941
    07-09 22:14:16.390 2601-2890/? I/AudioPolicyManager: stopOutput() output 2, stream 7, session 7943
    07-09 22:14:16.390 2601-2890/? I/AudioPolicyManager: stopOutput() output 2, stream 7, session 7944
    07-09 22:14:17.620 2601-2890/? I/AudioPolicyManager: stopOutput() output 2, stream 7, session 7942
    07-09 22:14:17.620 2601-2890/? I/AudioPolicyManager: getNewOutputDevice() selected device 0
    07-09 22:14:17.620 2601-2890/? I/AudioPolicyManager: setOutputDevice() output 2 device 0x0000 delayMs 40
    07-09 22:14:17.620 2601-2890/? I/AudioPolicyManager: setOutputDevice() prevDevice 0x0002
    07-09 22:14:17.620 2601-2890/? I/AudioPolicyManager: setOutputDevice() setting same device 0x0000 or null device for output 2

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        clips = new SoundPool.Builder()
                .setMaxStreams(22)
                .setAudioAttributes(new AudioAttributes.Builder()
                        .setUsage(AudioAttributes.USAGE_ALARM)
                        .setContentType(AudioAttributes.CONTENT_TYPE_UNKNOWN)
                        .setFlags(AudioAttributes.FLAG_AUDIBILITY_ENFORCED)
                        .build())
                .build();
    } else {
        clips = new SoundPool(22, AudioManager.STREAM_ALARM, 0);
    }

ScheduledExecutorService trigger = Executors.newScheduledThreadPool(3);
int e1 = clips.load(this, noteFiles.getResourceId(0,0), 1);
int[] noteIDs = {e1};

playNote = new Runnable() {
        public void run() {
        clips.play(noteIDs[0], realTuneVol, realTuneVol, 1, 0, 1);
}
}

clips.setOnLoadCompleteListener(new SoundPool.OnLoadCompleteListener() {
        @Override
        public void onLoadComplete(SoundPool soundPool, int sampleId, int status) {
          if (savedInstanceState != null) {
               trigger.shutdown();
           } else {
               trigger.scheduleAtFixedRate(playNote, 0, 125, TimeUnit.MILLISECONDS);
                    }
                }
            }
        }
    });

我同时播放了很多片段，所以我明白这可能是一个问题，但我没有注意到播放的片段数量和这个错误之间的关系。然而，我读到和体验到的是，如果我试图播放太多的片段，声音池会开始跳过它们，但它不会一起停止。因此，我想知道这个问题是否与我试图播放的剪辑数量无关，而实际上与ScheduleDExecutorService有关。当声音停止时，Runnable似乎不再执行，因为我没有从它收到新的日志消息。非常感谢任何帮助。

Answer 1

正如这里提到的，ScheduledExecutorService会抑制异常。http://code.nomad-labs.com/2011/12/09/moth-fk-the-scheduledexecutorservice/

因此，通过将整个Runnable包装在try catch块中，我能够发现ArrayIndexOutOfBoundsException有时是由于程序的另一部分而发生的，从而导致了问题。

playNote = new Runnable() {
    public void run() {
    try{
    clips.play(noteIDs[0], realTuneVol, realTuneVol, 1, 0, 1);
    }
    catch (Throwable th){
        Log.v("ErrorInRunnable", th.toString());
    }
    }
}