diff --git a/src/Notes-master/src/net/micode/notes/ui/AlarmAlertActivity.java b/src/Notes-master/src/net/micode/notes/ui/AlarmAlertActivity.java
index 87e3459..356504e 100644
--- a/src/Notes-master/src/net/micode/notes/ui/AlarmAlertActivity.java
+++ b/src/Notes-master/src/net/micode/notes/ui/AlarmAlertActivity.java
@@ -99,12 +99,14 @@ public class AlarmAlertActivity extends Activity implements OnClickListener, OnD
         PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
         return pm.isScreenOn(); // 返回屏幕是否处于亮屏状态
     }
-
+    /**
+     * 播放闹钟音。
+     */
     private void playAlarmSound() {
-        Uri url = RingtoneManager.getActualDefaultRingtoneUri(this, RingtoneManager.TYPE_ALARM);
+        Uri url = RingtoneManager.getActualDefaultRingtoneUri(this, RingtoneManager.TYPE_ALARM);// 获取闹钟铃声的URI
 
         int silentModeStreams = Settings.System.getInt(getContentResolver(),
-                Settings.System.MODE_RINGER_STREAMS_AFFECTED, 0);
+                Settings.System.MODE_RINGER_STREAMS_AFFECTED, 0);// 获取当前静音模式下影响铃声的流
 
         if ((silentModeStreams & (1 << AudioManager.STREAM_ALARM)) != 0) {
             mPlayer.setAudioStreamType(silentModeStreams);