diff --git a/app/src/main/java/net/micode/notes/ui/activities/AlarmAlertActivity.java b/app/src/main/java/net/micode/notes/ui/activities/AlarmAlertActivity.java
index fb8d889..ae50b19 100644
--- a/app/src/main/java/net/micode/notes/ui/activities/AlarmAlertActivity.java
+++ b/app/src/main/java/net/micode/notes/ui/activities/AlarmAlertActivity.java
@@ -39,13 +39,19 @@ import net.micode.notes.tool.DataUtils;
 
 import java.io.IOException;
 
-
+/**
+ * 闹钟应用活动类
+ */
 public class AlarmAlertActivity extends Activity implements OnClickListener, OnDismissListener {
     private long mNoteId;
     private String mSnippet;
     private static final int SNIPPET_PREW_MAX_LEN = 60;
     MediaPlayer mPlayer;
 
+    /**
+     * onCreate 生命周期方法
+     * @param savedInstanceState 之前保存的实例状态
+     */
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -83,11 +89,18 @@ public class AlarmAlertActivity extends Activity implements OnClickListener, OnD
         }
     }
 
+    /**
+     * 屏幕是否开着
+     * @return  状态
+     */
     private boolean isScreenOn() {
         PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
         return pm.isScreenOn();
     }
 
+    /**
+     * 播放闹钟提示音
+     */
     private void playAlarmSound() {
         Uri url = RingtoneManager.getActualDefaultRingtoneUri(this, RingtoneManager.TYPE_ALARM);
 
@@ -119,6 +132,9 @@ public class AlarmAlertActivity extends Activity implements OnClickListener, OnD
         }
     }
 
+    /**
+     * 显示操作弹窗
+     */
     private void showActionDialog() {
         AlertDialog.Builder dialog = new AlertDialog.Builder(this);
         dialog.setTitle(R.string.app_name);
@@ -130,6 +146,11 @@ public class AlarmAlertActivity extends Activity implements OnClickListener, OnD
         dialog.show().setOnDismissListener(this);
     }
 
+    /**
+     * 在点击时调用该时间
+     * @param dialog    弹窗接口
+     * @param which     接口类型
+     */
     public void onClick(DialogInterface dialog, int which) {
         switch (which) {
             case DialogInterface.BUTTON_NEGATIVE:
@@ -143,11 +164,18 @@ public class AlarmAlertActivity extends Activity implements OnClickListener, OnD
         }
     }
 
+    /**
+     * 在活动停止调用，停止播放闹钟声音
+     * @param dialog
+     */
     public void onDismiss(DialogInterface dialog) {
         stopAlarmSound();
         finish();
     }
 
+    /**
+     * 停止播放闹钟声音
+     */
     private void stopAlarmSound() {
         if (mPlayer != null) {
             mPlayer.stop();