diff --git a/src/main/java/net/micode/notes/gtask/exception/NetworkFailureException.java b/src/main/java/net/micode/notes/gtask/exception/NetworkFailureException.java
index 4bdd6c6..d28af4d 100644
--- a/src/main/java/net/micode/notes/gtask/exception/NetworkFailureException.java
+++ b/src/main/java/net/micode/notes/gtask/exception/NetworkFailureException.java
@@ -15,7 +15,6 @@
  */
 
 package net.micode.notes.gtask.exception;
-
 public class NetworkFailureException extends Exception {
     private static final long serialVersionUID = 2107610287180234136L;
 
@@ -26,8 +25,7 @@ public class NetworkFailureException extends Exception {
     public NetworkFailureException(String paramString) {
         super(paramString);
     }
-
     public NetworkFailureException(String paramString, Throwable paramThrowable) {
         super(paramString, paramThrowable);
     }
-}
+}
\ No newline at end of file
diff --git a/src/main/java/net/micode/notes/tool/DataUtils.java b/src/main/java/net/micode/notes/tool/DataUtils.java
index e918390..7ef3485 100644
--- a/src/main/java/net/micode/notes/tool/DataUtils.java
+++ b/src/main/java/net/micode/notes/tool/DataUtils.java
@@ -135,8 +135,22 @@ public class DataUtils {
         }
         return count;
     }
-
+    /**
+     * @Method      visibleInNoteDatabase
+     * @Date        2023/12/13 9:08
+     * @param resolver
+     * @param noteId
+     * @param type
+     * @Author      lenovo
+     * @Return      boolean
+     * @Description 访问数据库中是否有 noteId 对应的便签
+     */
     public static boolean visibleInNoteDatabase(ContentResolver resolver, long noteId, int type) {
+        /**
+          * withAppendedId 将 URI 和 ID 连接成一个新的URI
+          * query 返回 Uri 中符合 selection 的表格
+          * lenovo 2023/12/13 9:06
+        */
         Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId),
                 null,
                 NoteColumns.TYPE + "=? AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER,
diff --git a/src/main/java/net/micode/notes/ui/AlarmAlertActivity.java b/src/main/java/net/micode/notes/ui/AlarmAlertActivity.java
index 42170af..156cc8a 100644
--- a/src/main/java/net/micode/notes/ui/AlarmAlertActivity.java
+++ b/src/main/java/net/micode/notes/ui/AlarmAlertActivity.java
@@ -47,14 +47,28 @@ public class AlarmAlertActivity extends Activity implements OnClickListener, OnD
     MediaPlayer mPlayer;
 
     @Override
-    //TODO add comments of this method
+     /**
+      * @Method      onCreate
+      * @Date        2023/12/13 8:15
+      * @param savedInstanceState
+      * @Author      lenovo
+      * @Return      void
+      * @Description
+      */
     protected void onCreate(Bundle savedInstanceState) {
+        /**
+          * Bundel 类似于 map，key-value存储
+          * super 代表父类, 调用 onCreate 用于恢复上次结束的状态
+          * lenovo 2023/12/13 8:39
+        */
         super.onCreate(savedInstanceState);
         requestWindowFeature(Window.FEATURE_NO_TITLE);
 
         final Window win = getWindow();
+        // 在屏幕锁定时显示
         win.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
 
+        // 锁屏时到闹钟提示时间后，点亮屏幕
         if (!isScreenOn()) {
             win.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
                     | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
@@ -67,6 +81,7 @@ public class AlarmAlertActivity extends Activity implements OnClickListener, OnD
         try {
             mNoteId = Long.valueOf(intent.getData().getPathSegments().get(1));
             mSnippet = DataUtils.getSnippetById(this.getContentResolver(), mNoteId);
+            // 超出长度则变为 substr + "..."
             mSnippet = mSnippet.length() > SNIPPET_PREW_MAX_LEN ? mSnippet.substring(0,
                     SNIPPET_PREW_MAX_LEN) + getResources().getString(R.string.notelist_string_info)
                     : mSnippet;
@@ -76,7 +91,8 @@ public class AlarmAlertActivity extends Activity implements OnClickListener, OnD
         }
 
         mPlayer = new MediaPlayer();
-        if (DataUtils.visibleInNoteDatabase(getContentResolver(), mNoteId, Notes.TYPE_NOTE)) { //在这里做时间判断？定时器怎么实现的？
+        // 查找数据库中有没有 mNoteId 的便签, 如果有则激发对话框 + 闹钟提示音
+        if (DataUtils.visibleInNoteDatabase(getContentResolver(), mNoteId, Notes.TYPE_NOTE)) {
             showActionDialog();
             playAlarmSound();
         } else {