diff --git a/Notes.java b/Notes.java
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+++ b/Notes.java
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+/*
+ * 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.
+ */
+
+package net.micode.notes.data;
+
+import android.net.Uri;
+public class NotePad {
+
+    // 定义内容提供器的授权信息
+    public static final String AUTHORITY = "com.example.android.notepad";
+
+    // 定义小部件的类型
+    public static final int TYPE_WIDGET_INVALIDE = -1;
+    public static final int TYPE_WIDGET_2X = 0;
+    public static final int TYPE_WIDGET_4X = 1;
+
+    // 定义数据常量
+    public static class DataConstants {
+        public static final String NOTE = TextNote.CONTENT_ITEM_TYPE;
+        public static final String CALL_NOTE = CallNote.CONTENT_ITEM_TYPE;
+    }
+
+    // 查询所有记事和文件夹的Uri
+    public static final Uri CONTENT_NOTE_URI = Uri.parse("content://" + AUTHORITY + "/note");
+
+    // 查询数据的Uri
+    public static final Uri CONTENT_DATA_URI = Uri.parse("content://" + AUTHORITY + "/data");
+
+    // 定义笔记的列名接口
+    public interface NoteColumns {
+        // 行的唯一ID值，类型为整型
+        public static final String ID = "_id";
+
+        // 笔记或文件夹的父ID，类型为整型
+        public static final String PARENT_ID = "parent_id";
+
+        // 笔记或文件夹的创建日期，类型为整型
+        public static final String CREATED_DATE = "created_date";
+
+        // 笔记或文件夹的修改日期，类型为整型
+        public static final String MODIFIED_DATE = "modified_date";
+
+        // 提醒日期，类型为整型
+        public static final String ALERTED_DATE = "alert_date";
+
+        // 文件夹的名字或笔记的文字内容，类型为文本
+        public static final String SNIPPET = "snippet";
+
+        // 笔记的小部件ID，类型为整型
+        public static final String WIDGET_ID = "widget_id";
+
+        // 笔记的小部件类型，类型为整型
+        public static final String WIDGET_TYPE = "widget_type";
+
+        // 笔记的背景色ID，类型为整型
+        public static final String BG_COLOR_ID = "bg_color_id";
+
+        // 是否有附件，类型为整型
+        public static final String HAS_ATTACHMENT = "has_attachment";
+
+        // 文件夹中笔记数量，类型为整型
+        public static final String NOTES_COUNT = "notes_count";
+
+        // 文件类型：文件夹或笔记，类型为整型
+        public static final String TYPE = "type";
+
+        // 上一次同步ID值，类型为整型
+        public static final String SYNC_ID = "sync_id";
+
+        // 标记本地是否修改，类型为整型
+        public static final String LOCAL_MODIFIED = "local_modified";
+
+        // 移动到临时文件夹之前的原始父ID，类型为整型
+        public static final String ORIGIN_PARENT_ID = "origin_parent_id";
+
+        // gtask的ID值，类型为文本
+        public static final String GTASK_ID = "gtask_id";
+
+        // 版本号，类型为整型
+        public static final String VERSION = "version";
+    }
+
+    // 定义数据的列名接口
+    public interface DataColumns {
+        // 行的唯一ID值，类型为整型
+        public static final String ID = "_id";
+
+        // 项的MIME类型，类型为文本
+        public static final String MIME_TYPE = "mime_type";
+
+        // 引用笔记的ID，类型为整型
+        public static final String NOTE_ID = "note_id";
+
+        // 创建日期，类型为整型
+        public static final String CREATED_DATE = "created_date";
+
+        // 修改日期，类型为整型
+        public static final String MODIFIED_DATE = "modified_date";
+
+        // 数据的内容，类型为文本
+        public static final String CONTENT = "content";
+
+        // 通用数据列，含义由MIMETYPE定义，用于整型数据类型
+        public static final String DATA1 = "data1";
+
+        // 通用数据列，含义由MIMETYPE定义，用于整型数据类型
+        public static final String DATA2 = "data2";
+
+        // 通用数据列，含义由MIMETYPE定义，用于文本数据类型
+        public static final String DATA3 = "data3";
+
+        // 通用数据列，含义由MIMETYPE定义，用于文本数据类型
+        public static final String DATA4 = "data4";
+
+        // 通用数据列，含义由MIMETYPE定义，用于文本数据类型
+        public static final String DATA5 = "data5";
+    }
+
+    // 文本笔记的列名和Uri接口，继承自DataColumns
+    public static final class TextNote implements DataColumns {
+        // 指示文本在检查清单模式下是否勾选，类型为整型，1代表勾选，0代表未勾选
+        public static final String MODE = DATA1;
+        public static final int MODE_CHECK_LIST = 1;
+        public static final String CONTENT_TYPE = "vnd.android.cursor.dir/text_note";
+        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");
+    }
+
+    // 通话记录笔记的列名和Uri接口，继承自DataColumns
+    public static final class CallNote implements DataColumns {
+        // 通话日期，类型为整型
+        public static final String CALL_DATE = DATA1;
+
+        // 手机号码，类型为文本
+        public static final String PHONE_NUMBER = DATA3;
+
+        public static final String CONTENT_TYPE = "vnd.android.cursor.dir/call_note";
+        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");
+    }
+}
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