检测正在进行的通知铃声的结束

Question

有谁知道如何检测正在进行的通知铃声的结束？ 我已经创建了一个通知，声音将设置为max 但我希望在通知铃声结束后将音量恢复为原始音量。我尝试过使用计时器但是如果有多个通知进入则无效。

以下是我目前的进展：

//get the default phone notification volume before it is set to maximum
phoneVolume = am.getStreamVolume(AudioManager.STREAM_NOTIFICATION);

//set the phone notification volume to maximum
am.setStreamVolume(AudioManager.STREAM_NOTIFICATION, 
am.getStreamMaxVolume(AudioManager.STREAM_NOTIFICATION), 0);

//initiate the notification 
NotificationManagerCompat.from(this).notify(notificationId, notification);

//Set the phone notification volume back to default volume after 5 seconds
new Timer().schedule(new TimerTask() {
       public void run() {                
           Log.i(TAG, "Phone notification volume is set back to original volume after 5 seconds");
           am.setStreamVolume(AudioManager.STREAM_NOTIFICATION, phoneVolume, 0);
       }
}, 5000);

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