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 ae50b19..64bd8c7 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
@@ -43,8 +43,17 @@ import java.io.IOException;
  * 闹钟应用活动类
  */
 public class AlarmAlertActivity extends Activity implements OnClickListener, OnDismissListener {
+    /**
+     * 便签ID
+     */
     private long mNoteId;
+    /**
+     * 片段
+     */
     private String mSnippet;
+    /**
+     * 片段前缀最长长度
+     */
     private static final int SNIPPET_PREW_MAX_LEN = 60;
     MediaPlayer mPlayer;
 
@@ -67,22 +76,28 @@ public class AlarmAlertActivity extends Activity implements OnClickListener, OnD
                     | WindowManager.LayoutParams.FLAG_LAYOUT_INSET_DECOR);
         }
 
+        //定义意图对象，调用系统应用
         Intent intent = getIntent();
 
         try {
+            // 便签ID
             mNoteId = Long.valueOf(intent.getData().getPathSegments().get(1));
+            // 片段名称
             mSnippet = DataUtils.getSnippetById(this.getContentResolver(), mNoteId);
             mSnippet = mSnippet.length() > SNIPPET_PREW_MAX_LEN ? mSnippet.substring(0,
                     SNIPPET_PREW_MAX_LEN) + getResources().getString(R.string.notelist_string_info)
                     : mSnippet;
         } catch (IllegalArgumentException e) {
+            // 异常处理
             e.printStackTrace();
             return;
         }
 
         mPlayer = new MediaPlayer();
         if (DataUtils.visibleInNoteDatabase(getContentResolver(), mNoteId, Notes.TYPE_NOTE)) {
+            // 显示弹出窗口
             showActionDialog();
+            // 播放提示音
             playAlarmSound();
         } else {
             finish();
@@ -137,12 +152,18 @@ public class AlarmAlertActivity extends Activity implements OnClickListener, OnD
      */
     private void showActionDialog() {
         AlertDialog.Builder dialog = new AlertDialog.Builder(this);
+        // 设置标题
         dialog.setTitle(R.string.app_name);
+        // 设置消息
         dialog.setMessage(mSnippet);
+        // 设置按钮
         dialog.setPositiveButton(R.string.notealert_ok, this);
+        // 判断屏幕状态是否正常
         if (isScreenOn()) {
+            // 设置导航按钮
             dialog.setNegativeButton(R.string.notealert_enter, this);
         }
+        // 展示弹窗并绑定监听器
         dialog.show().setOnDismissListener(this);
     }