diff --git a/src/net/micode/notes/data/Notes.java b/src/net/micode/notes/data/Notes.java
index f240604..890ab3d 100644
--- a/src/net/micode/notes/data/Notes.java
+++ b/src/net/micode/notes/data/Notes.java
@@ -1,279 +1,193 @@
+```java
 /*
- * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *        http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+
+1.Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+*
+2.Licensed under the Apache License, Version 2.0 (the "License");
+3.you may not use this file except in compliance with the License.
+4.You may obtain a copy of the License at
+*
+5.http://www.apache.org/licenses/LICENSE-2.0
+*
+6.Unless required by applicable law or agreed to in writing, software
+7.distributed under the License is distributed on an "AS IS" BASIS,
+8.WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+9.See the License for the specific language governing permissions and
+10.limitations under the License.
+*/
+
+package net.micode.notes.data;  // 定义包名
+import android.net.Uri;  // 引入 Uri 类，用于处理 URI（统一资源标识符）
+public class Notes {  // 定义 Notes 类
+    public static final String AUTHORITY = "micodenotes";  // 定义授权标识符
+    public static final String TAG = "Notes";  // 定义标签用于日志记录
+    public static final int TYPENOTE     = 0;  // 定义笔记类型常量（类型为笔记）
+    public static final int TYPEFOLDER   = 1;  // 定义文件夹类型常量（类型为文件夹）
+    public static final int TYPESYSTEM   = 2;  // 定义系统类型常量（类型为系统）
+/**
+ * Following IDs are system folders' identifiers
+ * {@link Notes#ID_ROOT_FOLDER } is default folder
+ * {@link Notes#ID_TEMPARAY_FOLDER } is for notes belonging no folder
+ * {@link Notes#ID_CALL_RECORD_FOLDER} is to store call records
  */
+public static final int ID_ROOT_FOLDER = 0;  // 系统文件夹的根文件夹 ID
+public static final int ID_TEMPARAY_FOLDER = -1;  // 临时文件夹的 ID（用于没有文件夹的笔记）
+public static final int ID_CALL_RECORD_FOLDER = -2;  // 通话记录文件夹的 ID
+public static final int ID_TRASH_FOLER = -3;  // 回收站文件夹的 ID
+
+public static final String INTENT_EXTRA_ALERT_DATE = "net.micode.notes.alert_date";  // 提醒日期的 Intent 字段
+public static final String INTENT_EXTRA_BACKGROUND_ID = "net.micode.notes.background_color_id";  // 背景颜色 ID 的 Intent 字段
+public static final String INTENT_EXTRA_WIDGET_ID = "net.micode.notes.widget_id";  // 小部件 ID 的 Intent 字段
+public static final String INTENT_EXTRA_WIDGET_TYPE = "net.micode.notes.widget_type";  // 小部件类型的 Intent 字段
+public static final String INTENT_EXTRA_FOLDER_ID = "net.micode.notes.folder_id";  // 文件夹 ID 的 Intent 字段
+public static final String INTENT_EXTRA_CALL_DATE = "net.micode.notes.call_date";  // 通话日期的 Intent 字段
+
+public static final int TYPE_WIDGET_INVALIDE      = -1;  // 小部件无效类型
+public static final int TYPE_WIDGET_2X            = 0;   // 小部件 2x 类型
+public static final int TYPE_WIDGET_4X            = 1;   // 小部件 4x 类型
+
+public static class DataConstants {  // 定义数据常量类
+    public static final String NOTE = TextNote.CONTENT_ITEM_TYPE;  // 文字笔记的内容类型常量
+    public static final String CALL_NOTE = CallNote.CONTENT_ITEM_TYPE;  // 通话笔记的内容类型常量
+}
 
-package net.micode.notes.data;
+/**
+ * Uri to query all notes and folders
+ */
+public static final Uri CONTENT_NOTE_URI = Uri.parse("content://" + AUTHORITY + "/note");  // 用于查询所有笔记和文件夹的 URI
 
-import android.net.Uri;
-public class Notes {
-    public static final String AUTHORITY = "micode_notes";
-    public static final String TAG = "Notes";
-    public static final int TYPE_NOTE     = 0;
-    public static final int TYPE_FOLDER   = 1;
-    public static final int TYPE_SYSTEM   = 2;
+/**
+ * Uri to query data
+ */
+public static final Uri CONTENT_DATA_URI = Uri.parse("content://" + AUTHORITY + "/data");  // 用于查询数据的 URI
 
+public interface NoteColumns {  // 定义笔记相关列的接口
     /**
-     * Following IDs are system folders' identifiers
-     * {@link Notes#ID_ROOT_FOLDER } is default folder
-     * {@link Notes#ID_TEMPARAY_FOLDER } is for notes belonging no folder
-     * {@link Notes#ID_CALL_RECORD_FOLDER} is to store call records
+     * The unique ID for a row
+     * <P> Type: INTEGER (long) </P>
      */
-    public static final int ID_ROOT_FOLDER = 0;
-    public static final int ID_TEMPARAY_FOLDER = -1;
-    public static final int ID_CALL_RECORD_FOLDER = -2;
-    public static final int ID_TRASH_FOLER = -3;
-
-    public static final String INTENT_EXTRA_ALERT_DATE = "net.micode.notes.alert_date";
-    public static final String INTENT_EXTRA_BACKGROUND_ID = "net.micode.notes.background_color_id";
-    public static final String INTENT_EXTRA_WIDGET_ID = "net.micode.notes.widget_id";
-    public static final String INTENT_EXTRA_WIDGET_TYPE = "net.micode.notes.widget_type";
-    public static final String INTENT_EXTRA_FOLDER_ID = "net.micode.notes.folder_id";
-    public static final String INTENT_EXTRA_CALL_DATE = "net.micode.notes.call_date";
-
-    public static final int TYPE_WIDGET_INVALIDE      = -1;
-    public static final int TYPE_WIDGET_2X            = 0;
-    public static final int TYPE_WIDGET_4X            = 1;
-
-    public static class DataConstants {
-        public static final String NOTE = TextNote.CONTENT_ITEM_TYPE;
-        public static final String CALL_NOTE = CallNote.CONTENT_ITEM_TYPE;
-    }
+    public static final String ID = "_id";  // 行的唯一 ID，类型为整型（long）
 
     /**
-     * Uri to query all notes and folders
+     * The parent's id for note or folder
+     * <P> Type: INTEGER (long) </P>
      */
-    public static final Uri CONTENT_NOTE_URI = Uri.parse("content://" + AUTHORITY + "/note");
+    public static final String PARENT_ID = "parent_id";  // 笔记或文件夹的父级 ID，类型为整型（long）
 
     /**
-     * Uri to query data
+     * Created data for note or folder
+     * <P> Type: INTEGER (long) </P>
      */
-    public static final Uri CONTENT_DATA_URI = Uri.parse("content://" + AUTHORITY + "/data");
-
-    public interface NoteColumns {
-        /**
-         * The unique ID for a row
-         * <P> Type: INTEGER (long) </P>
-         */
-        public static final String ID = "_id";
-
-        /**
-         * The parent's id for note or folder
-         * <P> Type: INTEGER (long) </P>
-         */
-        public static final String PARENT_ID = "parent_id";
-
-        /**
-         * Created data for note or folder
-         * <P> Type: INTEGER (long) </P>
-         */
-        public static final String CREATED_DATE = "created_date";
-
-        /**
-         * Latest modified date
-         * <P> Type: INTEGER (long) </P>
-         */
-        public static final String MODIFIED_DATE = "modified_date";
-
-
-        /**
-         * Alert date
-         * <P> Type: INTEGER (long) </P>
-         */
-        public static final String ALERTED_DATE = "alert_date";
-
-        /**
-         * Folder's name or text content of note
-         * <P> Type: TEXT </P>
-         */
-        public static final String SNIPPET = "snippet";
-
-        /**
-         * Note's widget id
-         * <P> Type: INTEGER (long) </P>
-         */
-        public static final String WIDGET_ID = "widget_id";
-
-        /**
-         * Note's widget type
-         * <P> Type: INTEGER (long) </P>
-         */
-        public static final String WIDGET_TYPE = "widget_type";
-
-        /**
-         * Note's background color's id
-         * <P> Type: INTEGER (long) </P>
-         */
-        public static final String BG_COLOR_ID = "bg_color_id";
+    public static final String CREATED_DATE = "created_date";  // 创建日期，类型为整型（long）
 
-        /**
-         * For text note, it doesn't has attachment, for multi-media
-         * note, it has at least one attachment
-         * <P> Type: INTEGER </P>
-         */
-        public static final String HAS_ATTACHMENT = "has_attachment";
-
-        /**
-         * Folder's count of notes
-         * <P> Type: INTEGER (long) </P>
-         */
-        public static final String NOTES_COUNT = "notes_count";
-
-        /**
-         * The file type: folder or note
-         * <P> Type: INTEGER </P>
-         */
-        public static final String TYPE = "type";
-
-        /**
-         * The last sync id
-         * <P> Type: INTEGER (long) </P>
-         */
-        public static final String SYNC_ID = "sync_id";
-
-        /**
-         * Sign to indicate local modified or not
-         * <P> Type: INTEGER </P>
-         */
-        public static final String LOCAL_MODIFIED = "local_modified";
-
-        /**
-         * Original parent id before moving into temporary folder
-         * <P> Type : INTEGER </P>
-         */
-        public static final String ORIGIN_PARENT_ID = "origin_parent_id";
-
-        /**
-         * The gtask id
-         * <P> Type : TEXT </P>
-         */
-        public static final String GTASK_ID = "gtask_id";
-
-        /**
-         * The version code
-         * <P> Type : INTEGER (long) </P>
-         */
-        public static final String VERSION = "version";
-    }
-
-    public interface DataColumns {
-        /**
-         * The unique ID for a row
-         * <P> Type: INTEGER (long) </P>
-         */
-        public static final String ID = "_id";
-
-        /**
-         * The MIME type of the item represented by this row.
-         * <P> Type: Text </P>
-         */
-        public static final String MIME_TYPE = "mime_type";
-
-        /**
-         * The reference id to note that this data belongs to
-         * <P> Type: INTEGER (long) </P>
-         */
-        public static final String NOTE_ID = "note_id";
-
-        /**
-         * Created data for note or folder
-         * <P> Type: INTEGER (long) </P>
-         */
-        public static final String CREATED_DATE = "created_date";
+    /**
+     * Latest modified date
+     * &lt;P&gt; Type: INTEGER (long) &lt;/P&gt;
+     */
+    public static final String MODIFIED_DATE = "modified_date";  // 最新修改日期，类型为整型（long）
 
-        /**
-         * Latest modified date
-         * <P> Type: INTEGER (long) </P>
-         */
-        public static final String MODIFIED_DATE = "modified_date";
 
-        /**
-         * Data's content
-         * <P> Type: TEXT </P>
-         */
-        public static final String CONTENT = "content";
+    /**
+     * Alert date
+     * &lt;P&gt; Type: INTEGER (long) &lt;/P&gt;
+     */
+    public static final String ALERTED_DATE = "alert_date";  // 提醒日期，类型为整型（long）
 
+    /**
+     * Folder's name or text content of note
+     * &lt;P&gt; Type: TEXT &lt;/P&gt;
+     */
+    public static final String SNIPPET = "snippet";  // 文件夹的名称或笔记的文本内容，类型为文本
 
-        /**
-         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
-         * integer data type
-         * <P> Type: INTEGER </P>
-         */
-        public static final String DATA1 = "data1";
+    /**
+     * Note's widget id
+     * &lt;P&gt; Type: INTEGER (long) &lt;/P&gt;
+     */
+    public static final String WIDGET_ID = "widget_id";  // 笔记的小部件 ID，类型为整型（long）
 
-        /**
-         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
-         * integer data type
-         * <P> Type: INTEGER </P>
-         */
-        public static final String DATA2 = "data2";
+    /**
+     * Note's widget type
+     * &lt;P&gt; Type: INTEGER (long) &lt;/P&gt;
+     */
+    public static final String WIDGET_TYPE = "widget_type";  // 笔记的小部件类型，类型为整型（long）
 
-        /**
-         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
-         * TEXT data type
-         * <P> Type: TEXT </P>
-         */
-        public static final String DATA3 = "data3";
+    /**
+     * Note's background color's id
+     * &lt;P&gt; Type: INTEGER (long) &lt;/P&gt;
+     */
+    public static final String BG_COLOR_ID = "bg_color_id";  // 笔记的背景颜色 ID，类型为整型（long）
 
-        /**
-         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
-         * TEXT data type
-         * <P> Type: TEXT </P>
-         */
-        public static final String DATA4 = "data4";
+    /**
+     * For text note, it doesn't has attachment, for multi-media
+     * note, it has at least one attachment
+     * &lt;P&gt; Type: INTEGER &lt;/P&gt;
+     */
+    public static final String HAS_ATTACHMENT = "has_attachment";  // 笔记是否有附件，类型为整型
 
-        /**
-         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
-         * TEXT data type
-         * <P> Type: TEXT </P>
-         */
-        public static final String DATA5 = "data5";
-    }
+    /**
+     * Folder's count of notes
+     * &lt;P&gt; Type: INTEGER (long) &lt;/P&gt;
+     */
+    public static final String NOTES_COUNT = "notes_count";  // 文件夹中的笔记数量，类型为整型（long）
 
-    public static final class TextNote implements DataColumns {
-        /**
-         * Mode to indicate the text in check list mode or not
-         * <P> Type: Integer 1:check list mode 0: normal mode </P>
-         */
-        public static final String MODE = DATA1;
+    /**
+     * The file type: folder or note
+     * &lt;P&gt; Type: INTEGER &lt;/P&gt;
+     */
+    public static final String TYPE = "type";  // 文件类型：文件夹或笔记，类型为整型
 
-        public static final int MODE_CHECK_LIST = 1;
+    /**
+     * The last sync id
+     * &lt;P&gt; Type: INTEGER (long) &lt;/P&gt;
+     */
+    public static final String SYNC_ID = "sync_id";  // 最后同步 ID，类型为整型（long）
 
-        public static final String CONTENT_TYPE = "vnd.android.cursor.dir/text_note";
+    /**
+     * Sign to indicate local modified or not
+     * &lt;P&gt; Type: INTEGER &lt;/P&gt;
+     */
+    public static final String LOCAL_MODIFIED = "local_modified";  // 标识本地是否有修改，类型为整型
 
-        public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/text_note";
+    /**
+     * Original parent id before moving into temporary folder
+     * &lt;P&gt; Type : INTEGER &lt;/P&gt;
+     */
+    public static final String ORIGIN_PARENT_ID = "origin_parent_id";  // 原始父级 ID（在移动到临时文件夹之前），类型为整型
 
-        public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/text_note");
-    }
+    /**
+     * The gtask id
+     * &lt;P&gt; Type : TEXT &lt;/P&gt;
+     */
+    public static final String GTASK_ID = "gtask_id";  // Google 任务 ID，类型为文本
 
-    public static final class CallNote implements DataColumns {
-        /**
-         * Call date for this record
-         * <P> Type: INTEGER (long) </P>
-         */
-        public static final String CALL_DATE = DATA1;
+    /**
+     * The version code
+     * &lt;P&gt; Type : INTEGER (long) &lt;/P&gt;
+     */
+    public static final String VERSION = "version";  // 版本号，类型为整型（long）
+}
 
-        /**
-         * Phone number for this record
-         * <P> Type: TEXT </P>
-         */
-        public static final String PHONE_NUMBER = DATA3;
+public interface DataColumns {  // 定义数据相关列的接口
+    /**
+     * The unique ID for a row
+     * &lt;P&gt; Type: INTEGER (long) &lt;/P&gt;
+     */
+    public static final String ID = "_id";  // 行的唯一 ID，类型为整型（long）
 
-        public static final String CONTENT_TYPE = "vnd.android.cursor.dir/call_note";
+    /**
+     * The MIME type of the item represented by this row.
+     * &lt;P&gt; Type: Text &lt;/P&gt;
+     */
+    public static final String MIME_TYPE = "mime_type";  // MIME 类型，类型为文本
 
-        public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/call_note";
+    /**
+     * The reference id to note that this data belongs to
+     * &lt;P&gt; Type: INTEGER (long) &lt;/P&gt;
+     */
+    public static final String NOTE_ID = "note_id";  // 该数据所属的笔记的 ID，类型为整型（long）
 
-        public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/call_note");
-    }
-}
+    /**
+     * Created data for note or folder
+     * &lt;P&gt; Type: INTEGER (long) &lt;/P&gt;
+     */
+    public