diff --git a/src/net/micode/notes/data/Notes.java b/src/net/micode/notes/data/Notes.java
index f240604..7e2be8b 100644
--- a/src/net/micode/notes/data/Notes.java
+++ b/src/net/micode/notes/data/Notes.java
@@ -17,9 +17,11 @@
 package net.micode.notes.data;
 
 import android.net.Uri;
+// Notes 类中定义了很多常量，这些常量大多是int型和string型
 public class Notes {
     public static final String AUTHORITY = "micode_notes";
     public static final String TAG = "Notes";
+    //定义三个常量，对NoteColumns.TYPE的值进行设置时会用到
     public static final int TYPE_NOTE     = 0;
     public static final int TYPE_FOLDER   = 1;
     public static final int TYPE_SYSTEM   = 2;
@@ -30,6 +32,8 @@ public class Notes {
      * {@link Notes#ID_TEMPARAY_FOLDER } is for notes belonging no folder
      * {@link Notes#ID_CALL_RECORD_FOLDER} is to store call records
      */
+
+    //定义特殊文件夹的ID值，用于标识根文件夹、临时文件夹、通话记录文件夹和回收站文件夹
     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;
@@ -54,119 +58,121 @@ public class Notes {
     /**
      * Uri to query all notes and folders
      */
-    public static final Uri CONTENT_NOTE_URI = Uri.parse("content://" + AUTHORITY + "/note");
+    public static final Uri CONTENT_NOTE_URI = Uri.parse("content://" + AUTHORITY + "/note");//定义查询便签和文件夹的指针。
 
     /**
      * Uri to query data
      */
-    public static final Uri CONTENT_DATA_URI = Uri.parse("content://" + AUTHORITY + "/data");
+    public static final Uri CONTENT_DATA_URI = Uri.parse("content://" + AUTHORITY + "/data");//定义查找数据的指针
 
+    // 定义NoteColumns的常量,用于后面创建数据库的表头
     public interface NoteColumns {
         /**
          * The unique ID for a row
          * <P> Type: INTEGER (long) </P>
          */
-        public static final String ID = "_id";
+        public static final String ID = "_id";//每一行的唯一ID，数据类型为长整型。
 
         /**
          * The parent's id for note or folder
          * <P> Type: INTEGER (long) </P>
          */
-        public static final String PARENT_ID = "parent_id";
+        public static final String PARENT_ID = "parent_id";//笔记或文件夹的父ID，数据类型为长整型。
 
         /**
          * Created data for note or folder
          * <P> Type: INTEGER (long) </P>
          */
-        public static final String CREATED_DATE = "created_date";
+        public static final String CREATED_DATE = "created_date";//笔记或文件夹创建日期，数据类型为长整型。
 
         /**
          * Latest modified date
          * <P> Type: INTEGER (long) </P>
          */
-        public static final String MODIFIED_DATE = "modified_date";
+        public static final String MODIFIED_DATE = "modified_date";//最近修改的日期，数据类型为长整型。
 
 
         /**
          * Alert date
          * <P> Type: INTEGER (long) </P>
          */
-        public static final String ALERTED_DATE = "alert_date";
+        public static final String ALERTED_DATE = "alert_date";//提醒日期，数据类型为长整型。
 
         /**
          * Folder's name or text content of note
          * <P> Type: TEXT </P>
          */
-        public static final String SNIPPET = "snippet";
+        public static final String SNIPPET = "snippet";//文件夹名称或笔记的文本内容，数据类型为文本。
 
         /**
          * Note's widget id
          * <P> Type: INTEGER (long) </P>
          */
-        public static final String WIDGET_ID = "widget_id";
+        public static final String WIDGET_ID = "widget_id";//笔记的小部件ID，数据类型为长整型。
 
         /**
          * Note's widget type
          * <P> Type: INTEGER (long) </P>
          */
-        public static final String WIDGET_TYPE = "widget_type";
+        public static final String WIDGET_TYPE = "widget_type";//笔记的小部件类型，数据类型为长整型。
 
         /**
          * 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 BG_COLOR_ID = "bg_color_id";//笔记背景颜色的ID，数据类型为长整型。
 
         /**
          * 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";
+        public static final String HAS_ATTACHMENT = "has_attachment";//是否有附件，对于文本笔记则没有附件，对于多媒体笔记则至少有一个附件，数据类型为整型。
 
         /**
          * Folder's count of notes
          * <P> Type: INTEGER (long) </P>
          */
-        public static final String NOTES_COUNT = "notes_count";
+        public static final String NOTES_COUNT = "notes_count";//文件夹内笔记的数量，数据类型为长整型
 
         /**
          * The file type: folder or note
          * <P> Type: INTEGER </P>
          */
-        public static final String TYPE = "type";
+        public static final String TYPE = "type";//文件类型，是文件夹还是笔记，数据类型为整型。
 
         /**
          * The last sync id
          * <P> Type: INTEGER (long) </P>
          */
-        public static final String SYNC_ID = "sync_id";
+        public static final String SYNC_ID = "sync_id";//最后同步的ID，数据类型为长整型
 
         /**
          * Sign to indicate local modified or not
          * <P> Type: INTEGER </P>
          */
-        public static final String LOCAL_MODIFIED = "local_modified";
+        public static final String LOCAL_MODIFIED = "local_modified";//标识是否在本地进行了修改，数据类型为整型
 
         /**
          * Original parent id before moving into temporary folder
          * <P> Type : INTEGER </P>
          */
-        public static final String ORIGIN_PARENT_ID = "origin_parent_id";
+        public static final String ORIGIN_PARENT_ID = "origin_parent_id";//移动到临时文件夹之前的原始父文件夹ID，数据类型为整型。
 
         /**
          * The gtask id
          * <P> Type : TEXT </P>
          */
-        public static final String GTASK_ID = "gtask_id";
+        public static final String GTASK_ID = "gtask_id";//数据类型为文本
 
         /**
          * The version code
          * <P> Type : INTEGER (long) </P>
          */
         public static final String VERSION = "version";
-    }
+    }//常量定义便签的属性
 
+    // 定义DataColumns的常量,用于后面创建数据库的表头
     public interface DataColumns {
         /**
          * The unique ID for a row
@@ -239,7 +245,7 @@ public class Notes {
          * <P> Type: TEXT </P>
          */
         public static final String DATA5 = "data5";
-    }
+    }//定义存储便签内容数据的
 
     public static final class TextNote implements DataColumns {
         /**
@@ -255,7 +261,7 @@ public class Notes {
         public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/text_note";
 
         public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/text_note");
-    }
+    }//文本内容的数据结构
 
     public static final class CallNote implements DataColumns {
         /**
@@ -275,5 +281,5 @@ public class Notes {
         public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/call_note";
 
         public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/call_note");
-    }
+    }//电话内容的数据结构
 }