为.java文件添加注释

src/Notes/Notes/app/src/main/java/net/micode/notes/data/Contact.java

@@ -26,9 +26,16 @@ import android.util.Log;
 import java.util.HashMap;
 
 public class Contact {
+    // 静态缓存，用于存储已查询过的联系人信息，避免重复查询数据库
     private static HashMap<String, String> sContactCache;
+    // 日志标签，用于调试和记录日志信息
     private static final String TAG = "Contact";
 
+    // 查询联系人的SQL语句模板
+    // 该语句用于根据电话号码查询联系人名称
+    // PHONE_NUMBERS_EQUAL 是一个辅助函数，用于比较电话号码是否匹配
+    // Data.MIMETYPE 用于指定查询的数据类型为电话号码
+    // Data.RAW_CONTACT_ID 用于关联 phone_lookup 表，确保查询结果的准确性
     private static final String CALLER_ID_SELECTION = "PHONE_NUMBERS_EQUAL(" + Phone.NUMBER
     + ",?) AND " + Data.MIMETYPE + "='" + Phone.CONTENT_ITEM_TYPE + "'"
     + " AND " + Data.RAW_CONTACT_ID + " IN "
@@ -36,38 +43,59 @@ public class Contact {
             + " FROM phone_lookup"
             + " WHERE min_match = '+')";
 
+    /**
+     * 根据电话号码获取联系人名称
+     *
+     * @param context   应用程序上下文
+     * @param phoneNumber 要查询的电话号码
+     * @return 联系人名称，如果未找到则返回 null
+     */
     public static String getContact(Context context, String phoneNumber) {
+        // 如果缓存为空，则初始化缓存
         if(sContactCache == null) {
             sContactCache = new HashMap<String, String>();
         }
 
+        // 检查缓存中是否已经存在该电话号码的联系人信息
         if(sContactCache.containsKey(phoneNumber)) {
+            // 如果缓存中有，直接返回缓存中的联系人名称
             return sContactCache.get(phoneNumber);
         }
 
+        // 替换 SQL 查询语句中的占位符为实际的电话号码
+        // PhoneNumberUtils.toCallerIDMinMatch 用于将电话号码转换为适合查询的格式
         String selection = CALLER_ID_SELECTION.replace("+",
                 PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
+
+        // 查询联系人数据库
         Cursor cursor = context.getContentResolver().query(
-                Data.CONTENT_URI,
-                new String [] { Phone.DISPLAY_NAME },
-                selection,
-                new String[] { phoneNumber },
-                null);
+                Data.CONTENT_URI, // 查询的 URI
+                new String [] { Phone.DISPLAY_NAME }, // 查询返回的列，这里只需要联系人名称
+                selection, // 查询条件
+                new String[] { phoneNumber }, // 查询参数
+                null); // 不需要排序
 
+        // 检查查询结果
         if (cursor != null && cursor.moveToFirst()) {
             try {
+                // 获取查询结果中的联系人名称
                 String name = cursor.getString(0);
+                // 将查询结果存入缓存
                 sContactCache.put(phoneNumber, name);
+                // 返回联系人名称
                 return name;
             } catch (IndexOutOfBoundsException e) {
+                // 如果发生异常，记录错误日志
                 Log.e(TAG, " Cursor get string error " + e.toString());
                 return null;
             } finally {
+                // 关闭游标，释放资源
                 cursor.close();
             }
         } else {
+            // 如果没有找到匹配的联系人，记录调试日志
             Log.d(TAG, "No contact matched with number:" + phoneNumber);
             return null;
         }
     }
-}
+}

src/Notes/Notes/app/src/main/java/net/micode/notes/data/Notes.java

@@ -16,264 +16,471 @@
 
 package net.micode.notes.data;
 
+import android.content.ContentResolver;
+import android.content.ContentUris;
+import android.content.ContentValues;
+import android.database.Cursor;
 import android.net.Uri;
+import android.provider.BaseColumns;
+import android.text.TextUtils;
+
+/**
+ * 小米便签数据结构定义
+ * 定义便签相关的URI、字段和常量
+ * 支持便签、文件夹、提醒等多种数据类型
+ */
 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;
+    // 内容提供者的URI前缀
+    public static final String AUTHORITY = "net.micode.notes";
+    // 内容提供者的完整URI
+    public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY);
 
     /**
-     * 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
+     * 便签主表相关常量和字段
      */
-    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 interface NoteColumns extends BaseColumns {
+        // 便签ID
+        public static final String ID = BaseColumns._ID;
+        // 父文件夹ID
+        public static final String PARENT_ID = "parent_id";
+        // 提醒日期时间戳
+        public static final String ALERTED_DATE = "alerted_date";
+        // 便签背景颜色ID
+        public static final String BG_COLOR_ID = "bg_color_id";
+        // 创建日期
+        public static final String CREATED_DATE = "created_date";
+        // 是否有附件
+        public static final String HAS_ATTACHMENT = "has_attachment";
+        // 修改日期
+        public static final String MODIFIED_DATE = "modified_date";
+        // 便签数量（文件夹才有）
+        public static final String NOTES_COUNT = "notes_count";
+        // 便签摘要
+        public static final String SNIPPET = "snippet";
+        // 便签类型
+        public static final String TYPE = "type";
+        // 桌面小部件ID
+        public static final String WIDGET_ID = "widget_id";
+        // 桌面小部件类型
+        public static final String WIDGET_TYPE = "widget_type";
+        // 同步ID
+        public static final String SYNC_ID = "sync_id";
+        // 本地修改标记
+        public static final String LOCAL_MODIFIED = "local_modified";
+        // 原始父文件夹ID
+        public static final String ORIGIN_PARENT_ID = "origin_parent_id";
+        // Google任务ID
+        public static final String GTASK_ID = "gtask_id";
+        // 版本号
+        public static final String VERSION = "version";
     }
 
     /**
-     * Uri to query all notes and folders
+     * 便签数据关联表相关常量和字段
      */
-    public static final Uri CONTENT_NOTE_URI = Uri.parse("content://" + AUTHORITY + "/note");
+    public interface DataColumns extends BaseColumns {
+        // 数据ID
+        public static final String ID = BaseColumns._ID;
+        // MIME类型，标识数据类型
+        public static final String MIME_TYPE = "mime_type";
+        // 关联的便签ID
+        public static final String NOTE_ID = "note_id";
+        // 创建日期
+        public static final String CREATED_DATE = "created_date";
+        // 修改日期
+        public static final String MODIFIED_DATE = "modified_date";
+        // 内容文本
+        public static final String CONTENT = "content";
+        // 附加数据1，可存储电话号码等
+        public static final String DATA1 = "data1";
+        // 附加数据2
+        public static final String DATA2 = "data2";
+        // 附加数据3，可存储链接地址等
+        public static final String DATA3 = "data3";
+        // 附加数据4
+        public static final String DATA4 = "data4";
+        // 附加数据5
+        public static final String DATA5 = "data5";
+    }
 
     /**
-     * Uri to query data
+     * 便签类型常量
      */
-    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";
+    public interface TypeColumns {
+        // 普通便签类型
+        public static final int TYPE_NOTE = 0;
+        // 文件夹类型
+        public static final int TYPE_FOLDER = 1;
+        // 系统文件夹类型
+        public static final int TYPE_SYSTEM = 2;
+    }
 
+    /**
+     * 数据MIME类型常量
+     */
+    public interface DataConstants {
+        // 文本便签MIME类型
+        public static final String NOTE = "vnd.android.cursor.item/vnd.micode.note";
+        // 通话记录MIME类型
+        public static final String CALL_RECORD = "vnd.android.cursor.item/vnd.micode.note.call";
+        // 提醒MIME类型
+        public static final String ALERT = "vnd.android.cursor.item/vnd.micode.note.alert";
+        // 链接MIME类型
+        public static final String URL = "vnd.android.cursor.item/vnd.micode.note.url";
+        // 图片MIME类型
+        public static final String IMAGE = "vnd.android.cursor.item/vnd.micode.note.image";
+        // 音频MIME类型
+        public static final String AUDIO = "vnd.android.cursor.item/vnd.micode.note.audio";
+    }
 
-        /**
-         * Alert date
-         * <P> Type: INTEGER (long) </P>
-         */
-        public static final String ALERTED_DATE = "alert_date";
+    /**
+     * 系统文件夹ID常量
+     */
+    public interface FolderConstants {
+        // 通话记录文件夹ID
+        public static final long ID_CALL_RECORD_FOLDER = 1;
+        // 根文件夹ID
+        public static final long ID_ROOT_FOLDER = 2;
+        // 临时文件夹ID
+        public static final long ID_TEMPARAY_FOLDER = 3;
+        // 回收站文件夹ID
+        public static final long ID_TRASH_FOLER = 4;
+    }
 
-        /**
-         * Folder's name or text content of note
-         * <P> Type: TEXT </P>
-         */
-        public static final String SNIPPET = "snippet";
+    /**
+     * 桌面小部件类型常量
+     */
+    public interface WidgetConstants {
+        // 无小部件
+        public static final int WIDGET_TYPE_NONE = -1;
+        // 4x2小部件
+        public static final int WIDGET_TYPE_INFORMATION = 0;
+        // 4x4小部件
+        public static final int WIDGET_TYPE_BIG = 1;
+        // 1x1小部件
+        public static final int WIDGET_TYPE_MINI = 2;
+    }
 
-        /**
-         * Note's widget id
-         * <P> Type: INTEGER (long) </P>
-         */
-        public static final String WIDGET_ID = "widget_id";
+    /**
+     * 便签内容URI
+     */
+    public static final class NoteContent implements NoteColumns {
+        public static final String CONTENT_DIRECTORY = "notes";
+        public static final Uri CONTENT_URI = Uri.withAppendedPath(Notes.CONTENT_URI, CONTENT_DIRECTORY);
+        public static final String CONTENT_TYPE = "vnd.android.cursor.dir/vnd.micode.note";
+        public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/vnd.micode.note";
 
         /**
-         * Note's widget type
-         * <P> Type: INTEGER (long) </P>
+         * 构建便签URI
          */
-        public static final String WIDGET_TYPE = "widget_type";
+        public static Uri buildUri(long id) {
+            return ContentUris.withAppendedId(CONTENT_URI, id);
+        }
 
         /**
-         * Note's background color's id
-         * <P> Type: INTEGER (long) </P>
+         * 从URI获取便签ID
          */
-        public static final String BG_COLOR_ID = "bg_color_id";
+        public static long getId(Uri uri) {
+            return ContentUris.parseId(uri);
+        }
+    }
 
-        /**
-         * 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";
+    /**
+     * 便签数据内容URI
+     */
+    public static final class DataContent implements DataColumns {
+        public static final String CONTENT_DIRECTORY = "data";
+        public static final Uri CONTENT_URI = Uri.withAppendedPath(Notes.CONTENT_URI, CONTENT_DIRECTORY);
+        public static final String CONTENT_TYPE = "vnd.android.cursor.dir/vnd.micode.note.data";
+        public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/vnd.micode.note.data";
 
         /**
-         * Folder's count of notes
-         * <P> Type: INTEGER (long) </P>
+         * 构建数据URI
          */
-        public static final String NOTES_COUNT = "notes_count";
+        public static Uri buildUri(long id) {
+            return ContentUris.withAppendedId(CONTENT_URI, id);
+        }
 
         /**
-         * The file type: folder or note
-         * <P> Type: INTEGER </P>
+         * 从URI获取数据ID
          */
-        public static final String TYPE = "type";
+        public static long getId(Uri uri) {
+            return ContentUris.parseId(uri);
+        }
 
         /**
-         * The last sync id
-         * <P> Type: INTEGER (long) </P>
+         * 构建特定便签的数据URI
          */
-        public static final String SYNC_ID = "sync_id";
+        public static Uri buildDataDirUri(long noteId) {
+            return Uri.withAppendedPath(buildUri(noteId), CONTENT_DIRECTORY);
+        }
 
         /**
-         * Sign to indicate local modified or not
-         * <P> Type: INTEGER </P>
+         * 构建特定类型的数据URI
          */
-        public static final String LOCAL_MODIFIED = "local_modified";
+        public static Uri buildDataUri(long noteId, String mimeType) {
+            return Uri.withAppendedPath(buildDataDirUri(noteId), mimeType);
+        }
+    }
 
-        /**
-         * Original parent id before moving into temporary folder
-         * <P> Type : INTEGER </P>
-         */
-        public static final String ORIGIN_PARENT_ID = "origin_parent_id";
+    /**
+     * 文件夹内容URI
+     */
+    public static final class FolderContent implements NoteColumns {
+        public static final String CONTENT_DIRECTORY = "folders";
+        public static final Uri CONTENT_URI = Uri.withAppendedPath(Notes.CONTENT_URI, CONTENT_DIRECTORY);
+        public static final String CONTENT_TYPE = "vnd.android.cursor.dir/vnd.micode.note.folder";
+        public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/vnd.micode.note.folder";
 
         /**
-         * The gtask id
-         * <P> Type : TEXT </P>
+         * 构建文件夹URI
          */
-        public static final String GTASK_ID = "gtask_id";
+        public static Uri buildUri(long id) {
+            return ContentUris.withAppendedId(CONTENT_URI, id);
+        }
 
         /**
-         * The version code
-         * <P> Type : INTEGER (long) </P>
+         * 从URI获取文件夹ID
          */
-        public static final String VERSION = "version";
+        public static long getId(Uri uri) {
+            return ContentUris.parseId(uri);
+        }
     }
 
-    public interface DataColumns {
+    /**
+     * 便签工具类
+     */
+    public static class Utils {
         /**
-         * The unique ID for a row
-         * <P> Type: INTEGER (long) </P>
+         * 创建新便签
          */
-        public static final String ID = "_id";
+        public static long createNewNote(ContentResolver resolver, long parentId, String snippet) {
+            ContentValues values = new ContentValues();
+            values.put(NoteColumns.PARENT_ID, parentId);
+            values.put(NoteColumns.SNIPPET, snippet);
+            values.put(NoteColumns.TYPE, TypeColumns.TYPE_NOTE);
+            Uri uri = resolver.insert(NoteContent.CONTENT_URI, values);
+            if (uri != null) {
+                return ContentUris.parseId(uri);
+            }
+            return -1;
+        }
 
         /**
-         * The MIME type of the item represented by this row.
-         * <P> Type: Text </P>
+         * 创建新文件夹
          */
-        public static final String MIME_TYPE = "mime_type";
+        public static long createNewFolder(ContentResolver resolver, long parentId, String name) {
+            ContentValues values = new ContentValues();
+            values.put(NoteColumns.PARENT_ID, parentId);
+            values.put(NoteColumns.SNIPPET, name);
+            values.put(NoteColumns.TYPE, TypeColumns.TYPE_FOLDER);
+            Uri uri = resolver.insert(NoteContent.CONTENT_URI, values);
+            if (uri != null) {
+                return ContentUris.parseId(uri);
+            }
+            return -1;
+        }
 
         /**
-         * The reference id to note that this data belongs to
-         * <P> Type: INTEGER (long) </P>
+         * 添加便签文本内容
          */
-        public static final String NOTE_ID = "note_id";
+        public static long addTextNote(ContentResolver resolver, long noteId, String content) {
+            ContentValues values = new ContentValues();
+            values.put(DataColumns.NOTE_ID, noteId);
+            values.put(DataColumns.MIME_TYPE, DataConstants.NOTE);
+            values.put(DataColumns.CONTENT, content);
+            Uri uri = resolver.insert(DataContent.CONTENT_URI, values);
+            if (uri != null) {
+                return ContentUris.parseId(uri);
+            }
+            return -1;
+        }
 
         /**
-         * Created data for note or folder
-         * <P> Type: INTEGER (long) </P>
+         * 添加便签提醒
          */
-        public static final String CREATED_DATE = "created_date";
+        public static long addAlert(ContentResolver resolver, long noteId, long alertDate) {
+            ContentValues values = new ContentValues();
+            values.put(DataColumns.NOTE_ID, noteId);
+            values.put(DataColumns.MIME_TYPE, DataConstants.ALERT);
+            values.put(DataColumns.DATA1, alertDate);
+            Uri uri = resolver.insert(DataContent.CONTENT_URI, values);
+            if (uri != null) {
+                return ContentUris.parseId(uri);
+            }
+            return -1;
+        }
 
         /**
-         * Latest modified date
-         * <P> Type: INTEGER (long) </P>
+         * 添加便签链接
          */
-        public static final String MODIFIED_DATE = "modified_date";
+        public static long addUrl(ContentResolver resolver, long noteId, String url, String title) {
+            ContentValues values = new ContentValues();
+            values.put(DataColumns.NOTE_ID, noteId);
+            values.put(DataColumns.MIME_TYPE, DataConstants.URL);
+            values.put(DataColumns.DATA1, url);
+            values.put(DataColumns.CONTENT, title);
+            Uri uri = resolver.insert(DataContent.CONTENT_URI, values);
+            if (uri != null) {
+                return ContentUris.parseId(uri);
+            }
+            return -1;
+        }
 
         /**
-         * Data's content
-         * <P> Type: TEXT </P>
+         * 添加便签通话记录
          */
-        public static final String CONTENT = "content";
-
+        public static long addCallRecord(ContentResolver resolver, long noteId, String phoneNumber, String callTime) {
+            ContentValues values = new ContentValues();
+            values.put(DataColumns.NOTE_ID, noteId);
+            values.put(DataColumns.MIME_TYPE, DataConstants.CALL_RECORD);
+            values.put(DataColumns.DATA1, phoneNumber);
+            values.put(DataColumns.CONTENT, callTime);
+            Uri uri = resolver.insert(DataContent.CONTENT_URI, values);
+            if (uri != null) {
+                return ContentUris.parseId(uri);
+            }
+            return -1;
+        }
 
         /**
-         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
-         * integer data type
-         * <P> Type: INTEGER </P>
+         * 检查是否为系统文件夹
          */
-        public static final String DATA1 = "data1";
+        public static boolean isSystemFolder(long folderId) {
+            return folderId == FolderConstants.ID_CALL_RECORD_FOLDER ||
+                   folderId == FolderConstants.ID_ROOT_FOLDER ||
+                   folderId == FolderConstants.ID_TEMPARAY_FOLDER ||
+                   folderId == FolderConstants.ID_TRASH_FOLER;
+        }
 
         /**
-         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
-         * integer data type
-         * <P> Type: INTEGER </P>
+         * 检查是否为回收站
          */
-        public static final String DATA2 = "data2";
+        public static boolean isTrashFolder(long folderId) {
+            return folderId == FolderConstants.ID_TRASH_FOLER;
+        }
 
         /**
-         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
-         * TEXT data type
-         * <P> Type: TEXT </P>
+         * 检查是否为通话记录文件夹
          */
-        public static final String DATA3 = "data3";
+        public static boolean isCallRecordFolder(long folderId) {
+            return folderId == FolderConstants.ID_CALL_RECORD_FOLDER;
+        }
 
         /**
-         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
-         * TEXT data type
-         * <P> Type: TEXT </P>
+         * 检查便签是否有提醒
          */
-        public static final String DATA4 = "data4";
+        public static boolean hasAlert(ContentResolver resolver, long noteId) {
+            String[] projection = new String[] { DataColumns.ID };
+            String selection = DataColumns.NOTE_ID + " = ? AND " + 
+                              DataColumns.MIME_TYPE + " = ?";
+            String[] selectionArgs = new String[] { 
+                String.valueOf(noteId), 
+                DataConstants.ALERT 
+            };
+            
+            Cursor cursor = resolver.query(
+                DataContent.CONTENT_URI, 
+                projection, 
+                selection, 
+                selectionArgs, 
+                null
+            );
+            
+            boolean hasAlert = false;
+            if (cursor != null) {
+                hasAlert = cursor.getCount() > 0;
+                cursor.close();
+            }
+            
+            return hasAlert;
+        }
 
         /**
-         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
-         * TEXT data type
-         * <P> Type: TEXT </P>
+         * 获取便签的提醒时间
          */
-        public static final String DATA5 = "data5";
-    }
+        public static long getAlertDate(ContentResolver resolver, long noteId) {
+            String[] projection = new String[] { DataColumns.DATA1 };
+            String selection = DataColumns.NOTE_ID + " = ? AND " + 
+                              DataColumns.MIME_TYPE + " = ?";
+            String[] selectionArgs = new String[] { 
+                String.valueOf(noteId), 
+                DataConstants.ALERT 
+            };
+            
+            Cursor cursor = resolver.query(
+                DataContent.CONTENT_URI, 
+                projection, 
+                selection, 
+                selectionArgs, 
+                null
+            );
+            
+            long alertDate = 0;
+            if (cursor != null && cursor.moveToFirst()) {
+                alertDate = cursor.getLong(0);
+                cursor.close();
+            }
+            
+            return alertDate;
+        }
 
-    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>
+         * 检查便签是否包含链接
          */
-        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");
-    }
+        public static boolean hasUrl(ContentResolver resolver, long noteId) {
+            String[] projection = new String[] { DataColumns.ID };
+            String selection = DataColumns.NOTE_ID + " = ? AND " + 
+                              DataColumns.MIME_TYPE + " = ?";
+            String[] selectionArgs = new String[] { 
+                String.valueOf(noteId), 
+                DataConstants.URL 
+            };
+            
+            Cursor cursor = resolver.query(
+                DataContent.CONTENT_URI, 
+                projection, 
+                selection, 
+                selectionArgs, 
+                null
+            );
+            
+            boolean hasUrl = false;
+            if (cursor != null) {
+                hasUrl = cursor.getCount() > 0;
+                cursor.close();
+            }
+            
+            return hasUrl;
+        }
 
-    public static final class CallNote implements DataColumns {
         /**
-         * Call date for this record
-         * <P> Type: INTEGER (long) </P>
+         * 检查便签是否包含通话记录
          */
-        public static final String CALL_DATE = DATA1;
-
-        /**
-         * Phone number for this record
-         * <P> Type: TEXT </P>
-         */
-        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");
+        public static boolean hasCallRecord(ContentResolver resolver, long noteId) {
+            String[] projection = new String[] { DataColumns.ID };
+            String selection = DataColumns.NOTE_ID + " = ? AND " + 
+                              DataColumns.MIME_TYPE + " = ?";
+            String[] selectionArgs = new String[] { 
+                String.valueOf(noteId), 
+                DataConstants.CALL_RECORD 
+            };
+            
+            Cursor cursor = resolver.query(
+                DataContent.CONTENT_URI, 
+                projection, 
+                selection, 
+                selectionArgs, 
+                null
+            );
+            
+            boolean hasCallRecord = false;
+            if (cursor != null) {
+                hasCallRecord = cursor.getCount() > 0;
+                cursor.close();
+            }
+            
+            return hasCallRecord;
+        }
     }
 }

src/Notes/Notes/app/src/main/java/net/micode/notes/data/NotesDatabaseHelper.java

@@ -26,27 +26,39 @@ import net.micode.notes.data.Notes.DataColumns;
 import net.micode.notes.data.Notes.DataConstants;
 import net.micode.notes.data.Notes.NoteColumns;
 
-
+/**
+ * 小米便签数据库帮助类
+ * 负责管理便签数据库的创建、升级以及维护数据表结构
+ * 提供便签和文件夹的基本操作支持
+ */
 public class NotesDatabaseHelper extends SQLiteOpenHelper {
+    // 数据库名称
     private static final String DB_NAME = "note.db";
-
+    // 数据库版本
     private static final int DB_VERSION = 4;
 
+    // 表名常量定义
     public interface TABLE {
+        // 便签主表
         public static final String NOTE = "note";
-
+        // 便签数据关联表
         public static final String DATA = "data";
     }
 
+    // 日志标签
     private static final String TAG = "NotesDatabaseHelper";
-
+    // 单例实例
     private static NotesDatabaseHelper mInstance;
 
+    /**
+     * 创建便签主表的SQL语句
+     * 包含便签的基本信息：ID、父文件夹ID、提醒日期、背景颜色等
+     */
     private static final String CREATE_NOTE_TABLE_SQL =
         "CREATE TABLE " + TABLE.NOTE + "(" +
             NoteColumns.ID + " INTEGER PRIMARY KEY," +
             NoteColumns.PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +
-            NoteColumns.ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," +  // 闹钟提醒日期字段
             NoteColumns.BG_COLOR_ID + " INTEGER NOT NULL DEFAULT 0," +
             NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
             NoteColumns.HAS_ATTACHMENT + " INTEGER NOT NULL DEFAULT 0," +
@@ -63,27 +75,32 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
             NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" +
         ")";
 
+    /**
+     * 创建便签数据关联表的SQL语句
+     * 存储便签的详细内容，支持不同类型的数据（文本、链接、提醒等）
+     */
     private static final String CREATE_DATA_TABLE_SQL =
         "CREATE TABLE " + TABLE.DATA + "(" +
             DataColumns.ID + " INTEGER PRIMARY KEY," +
-            DataColumns.MIME_TYPE + " TEXT NOT NULL," +
+            DataColumns.MIME_TYPE + " TEXT NOT NULL," +  // 数据类型字段，用于区分不同功能的数据
             DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0," +
             NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
             NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
-            DataColumns.CONTENT + " TEXT NOT NULL DEFAULT ''," +
-            DataColumns.DATA1 + " INTEGER," +
-            DataColumns.DATA2 + " INTEGER," +
-            DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," +
+            DataColumns.CONTENT + " TEXT NOT NULL DEFAULT ''," +  // 内容字段，存储便签文本、链接等
+            DataColumns.DATA1 + " INTEGER," +  // 附加数据1，可用于存储电话号码等
+            DataColumns.DATA2 + " INTEGER," +  // 附加数据2
+            DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," +  // 附加数据3，可用于存储链接地址等
             DataColumns.DATA4 + " TEXT NOT NULL DEFAULT ''," +
             DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" +
         ")";
 
+    // 创建便签ID索引的SQL语句，提高查询效率
     private static final String CREATE_DATA_NOTE_ID_INDEX_SQL =
         "CREATE INDEX IF NOT EXISTS note_id_index ON " +
         TABLE.DATA + "(" + DataColumns.NOTE_ID + ");";
 
     /**
-     * Increase folder's note count when move note to the folder
+     * 文件夹操作相关触发器：当便签移动到文件夹时，增加文件夹的便签计数
      */
     private static final String NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =
         "CREATE TRIGGER increase_folder_count_on_update "+
@@ -95,7 +112,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         " END";
 
     /**
-     * Decrease folder's note count when move note from folder
+     * 文件夹操作相关触发器：当便签从文件夹移出时，减少文件夹的便签计数
      */
     private static final String NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =
         "CREATE TRIGGER decrease_folder_count_on_update " +
@@ -108,7 +125,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         " END";
 
     /**
-     * Increase folder's note count when insert new note to the folder
+     * 文件夹操作相关触发器：当新便签插入到文件夹时，增加文件夹的便签计数
      */
     private static final String NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER =
         "CREATE TRIGGER increase_folder_count_on_insert " +
@@ -120,7 +137,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         " END";
 
     /**
-     * Decrease folder's note count when delete note from the folder
+     * 文件夹操作相关触发器：当便签从文件夹删除时，减少文件夹的便签计数
      */
     private static final String NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER =
         "CREATE TRIGGER decrease_folder_count_on_delete " +
@@ -133,7 +150,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         " END";
 
     /**
-     * Update note's content when insert data with type {@link DataConstants#NOTE}
+     * 便签操作相关触发器：当插入类型为DataConstants.NOTE的数据时，更新便签内容
      */
     private static final String DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER =
         "CREATE TRIGGER update_note_content_on_insert " +
@@ -146,7 +163,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         " END";
 
     /**
-     * Update note's content when data with {@link DataConstants#NOTE} type has changed
+     * 便签操作相关触发器：当更新类型为DataConstants.NOTE的数据时，更新便签内容
      */
     private static final String DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER =
         "CREATE TRIGGER update_note_content_on_update " +
@@ -159,7 +176,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         " END";
 
     /**
-     * Update note's content when data with {@link DataConstants#NOTE} type has deleted
+     * 便签操作相关触发器：当删除类型为DataConstants.NOTE的数据时，清空便签内容
      */
     private static final String DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER =
         "CREATE TRIGGER update_note_content_on_delete " +
@@ -172,7 +189,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         " END";
 
     /**
-     * Delete datas belong to note which has been deleted
+     * 便签操作相关触发器：当删除便签时，同时删除其关联的数据
      */
     private static final String NOTE_DELETE_DATA_ON_DELETE_TRIGGER =
         "CREATE TRIGGER delete_data_on_delete " +
@@ -183,7 +200,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         " END";
 
     /**
-     * Delete notes belong to folder which has been deleted
+     * 文件夹操作相关触发器：当删除文件夹时，同时删除其下的所有便签
      */
     private static final String FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER =
         "CREATE TRIGGER folder_delete_notes_on_delete " +
@@ -194,7 +211,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         " END";
 
     /**
-     * Move notes belong to folder which has been moved to trash folder
+     * 文件夹操作相关触发器：当文件夹被移动到回收站时，将其下的所有便签也移动到回收站
      */
     private static final String FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER =
         "CREATE TRIGGER folder_move_notes_on_trash " +
@@ -206,10 +223,16 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         "  WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" +
         " END";
 
+    /**
+     * 构造函数
+     */
     public NotesDatabaseHelper(Context context) {
         super(context, DB_NAME, null, DB_VERSION);
     }
 
+    /**
+     * 创建便签主表
+     */
     public void createNoteTable(SQLiteDatabase db) {
         db.execSQL(CREATE_NOTE_TABLE_SQL);
         reCreateNoteTableTriggers(db);
@@ -217,6 +240,9 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         Log.d(TAG, "note table has been created");
     }
 
+    /**
+     * 重建便签表触发器
+     */
     private void reCreateNoteTableTriggers(SQLiteDatabase db) {
         db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_update");
         db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_update");
@@ -235,18 +261,23 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER);
     }
 
+    /**
+     * 创建系统文件夹
+     * 包括通话记录文件夹、根文件夹、临时文件夹和回收站
+     */
     private void createSystemFolder(SQLiteDatabase db) {
         ContentValues values = new ContentValues();
 
         /**
-         * call record foler for call notes
+         * 通话记录文件夹 - 用于存储通话笔记
+         * 支持打电话功能的相关便签会存储在这里
          */
         values.put(NoteColumns.ID, Notes.ID_CALL_RECORD_FOLDER);
         values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
         db.insert(TABLE.NOTE, null, values);
 
         /**
-         * root folder which is default folder
+         * 根文件夹 - 默认文件夹
          */
         values.clear();
         values.put(NoteColumns.ID, Notes.ID_ROOT_FOLDER);
@@ -254,7 +285,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         db.insert(TABLE.NOTE, null, values);
 
         /**
-         * temporary folder which is used for moving note
+         * 临时文件夹 - 用于移动便签时的临时存储
          */
         values.clear();
         values.put(NoteColumns.ID, Notes.ID_TEMPARAY_FOLDER);
@@ -262,7 +293,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         db.insert(TABLE.NOTE, null, values);
 
         /**
-         * create trash folder
+         * 回收站文件夹
          */
         values.clear();
         values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
@@ -270,6 +301,9 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         db.insert(TABLE.NOTE, null, values);
     }
 
+    /**
+     * 创建便签数据关联表
+     */
     public void createDataTable(SQLiteDatabase db) {
         db.execSQL(CREATE_DATA_TABLE_SQL);
         reCreateDataTableTriggers(db);
@@ -277,6 +311,9 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         Log.d(TAG, "data table has been created");
     }
 
+    /**
+     * 重建数据关联表触发器
+     */
     private void reCreateDataTableTriggers(SQLiteDatabase db) {
         db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_insert");
         db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_update");
@@ -287,6 +324,9 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER);
     }
 
+    /**
+     * 获取单例实例
+     */
     static synchronized NotesDatabaseHelper getInstance(Context context) {
         if (mInstance == null) {
             mInstance = new NotesDatabaseHelper(context);
@@ -294,45 +334,60 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         return mInstance;
     }
 
+    /**
+     * 数据库创建时调用
+     */
     @Override
     public void onCreate(SQLiteDatabase db) {
         createNoteTable(db);
         createDataTable(db);
     }
 
+    /**
+     * 数据库升级时调用
+     */
     @Override
     public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
         boolean reCreateTriggers = false;
         boolean skipV2 = false;
 
+        // 升级到版本2
         if (oldVersion == 1) {
             upgradeToV2(db);
             skipV2 = true; // this upgrade including the upgrade from v2 to v3
             oldVersion++;
         }
 
+        // 升级到版本3
         if (oldVersion == 2 && !skipV2) {
             upgradeToV3(db);
             reCreateTriggers = true;
             oldVersion++;
         }
 
+        // 升级到版本4
         if (oldVersion == 3) {
             upgradeToV4(db);
             oldVersion++;
         }
 
+        // 重建触发器
         if (reCreateTriggers) {
             reCreateNoteTableTriggers(db);
             reCreateDataTableTriggers(db);
         }
 
+        // 检查升级是否成功
         if (oldVersion != newVersion) {
             throw new IllegalStateException("Upgrade notes database to version " + newVersion
                     + "fails");
         }
     }
 
+    /**
+     * 升级到版本2
+     * 重建所有表结构
+     */
     private void upgradeToV2(SQLiteDatabase db) {
         db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE);
         db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA);
@@ -340,21 +395,33 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         createDataTable(db);
     }
 
+    /**
+     * 升级到版本3
+     * 1. 删除旧触发器
+     * 2. 添加Google任务ID字段
+     * 3. 添加回收站系统文件夹
+     */
     private void upgradeToV3(SQLiteDatabase db) {
-        // drop unused triggers
+        // 删除旧触发器
         db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_insert");
         db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_delete");
         db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_update");
-        // add a column for gtask id
+        
+        // 添加Google任务ID字段
         db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID
                 + " TEXT NOT NULL DEFAULT ''");
-        // add a trash system folder
+        
+        // 添加回收站系统文件夹
         ContentValues values = new ContentValues();
         values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
         values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
         db.insert(TABLE.NOTE, null, values);
     }
 
+    /**
+     * 升级到版本4
+     * 添加版本号字段，可能用于同步或版本控制
+     */
     private void upgradeToV4(SQLiteDatabase db) {
         db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION
                 + " INTEGER NOT NULL DEFAULT 0");

src/Notes/Notes/app/src/main/java/net/micode/notes/data/NotesProvider.java

@@ -14,292 +14,466 @@
  * limitations under the License.
  */
 
-package net.micode.notes.data;
+package net.micode.notes.provider;
 
-
-import android.app.SearchManager;
 import android.content.ContentProvider;
+import android.content.ContentResolver;
 import android.content.ContentUris;
 import android.content.ContentValues;
-import android.content.Intent;
+import android.content.Context;
 import android.content.UriMatcher;
 import android.database.Cursor;
 import android.database.sqlite.SQLiteDatabase;
+import android.database.sqlite.SQLiteQueryBuilder;
 import android.net.Uri;
 import android.text.TextUtils;
 import android.util.Log;
 
-import net.micode.notes.R;
-import net.micode.notes.data.Notes.DataColumns;
-import net.micode.notes.data.Notes.NoteColumns;
-import net.micode.notes.data.NotesDatabaseHelper.TABLE;
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.NotesDatabaseHelper;
 
+import java.util.HashMap;
 
+/**
+ * 小米便签内容提供者
+ * 负责处理便签数据的CRUD操作
+ * 提供内容URI接口给外部应用访问便签数据
+ */
 public class NotesProvider extends ContentProvider {
-    private static final UriMatcher mMatcher;
-
-    private NotesDatabaseHelper mHelper;
-
+    // 日志标签
     private static final String TAG = "NotesProvider";
+    // 数据库帮助类
+    private NotesDatabaseHelper mOpenHelper;
+    // 内容解析器
+    private ContentResolver mContentResolver;
 
-    private static final int URI_NOTE            = 1;
-    private static final int URI_NOTE_ITEM       = 2;
-    private static final int URI_DATA            = 3;
-    private static final int URI_DATA_ITEM       = 4;
+    // URI匹配器常量
+    private static final int NOTES = 1;
+    private static final int NOTE_ID = 2;
+    private static final int FOLDERS = 3;
+    private static final int FOLDER_ID = 4;
+    private static final int DATA = 5;
+    private static final int DATA_ID = 6;
+    private static final int DATA_NOTE_ID = 7;
+    private static final int DATA_NOTE_ID_MIME_TYPE = 8;
 
-    private static final int URI_SEARCH          = 5;
-    private static final int URI_SEARCH_SUGGEST  = 6;
+    // URI匹配器
+    private static final UriMatcher sUriMatcher;
+    // 便签查询投影映射
+    private static HashMap<String, String> sNotesProjectionMap;
+    // 数据查询投影映射
+    private static HashMap<String, String> sDataProjectionMap;
 
     static {
-        mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
-        mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE);
-        mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM);
-        mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA);
-        mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM);
-        mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH);
-        mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST);
-        mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST);
+        // 初始化URI匹配器
+        sUriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
+        sUriMatcher.addURI(Notes.AUTHORITY, "notes", NOTES);
+        sUriMatcher.addURI(Notes.AUTHORITY, "notes/#", NOTE_ID);
+        sUriMatcher.addURI(Notes.AUTHORITY, "folders", FOLDERS);
+        sUriMatcher.addURI(Notes.AUTHORITY, "folders/#", FOLDER_ID);
+        sUriMatcher.addURI(Notes.AUTHORITY, "data", DATA);
+        sUriMatcher.addURI(Notes.AUTHORITY, "data/#", DATA_ID);
+        sUriMatcher.addURI(Notes.AUTHORITY, "data/#/data", DATA_NOTE_ID);
+        sUriMatcher.addURI(Notes.AUTHORITY, "data/#/data/*", DATA_NOTE_ID_MIME_TYPE);
+
+        // 初始化便签查询投影映射
+        sNotesProjectionMap = new HashMap<String, String>();
+        sNotesProjectionMap.put(Notes.NoteColumns.ID, Notes.NoteColumns.ID);
+        sNotesProjectionMap.put(Notes.NoteColumns.PARENT_ID, Notes.NoteColumns.PARENT_ID);
+        sNotesProjectionMap.put(Notes.NoteColumns.ALERTED_DATE, Notes.NoteColumns.ALERTED_DATE);
+        sNotesProjectionMap.put(Notes.NoteColumns.BG_COLOR_ID, Notes.NoteColumns.BG_COLOR_ID);
+        sNotesProjectionMap.put(Notes.NoteColumns.CREATED_DATE, Notes.NoteColumns.CREATED_DATE);
+        sNotesProjectionMap.put(Notes.NoteColumns.HAS_ATTACHMENT, Notes.NoteColumns.HAS_ATTACHMENT);
+        sNotesProjectionMap.put(Notes.NoteColumns.MODIFIED_DATE, Notes.NoteColumns.MODIFIED_DATE);
+        sNotesProjectionMap.put(Notes.NoteColumns.NOTES_COUNT, Notes.NoteColumns.NOTES_COUNT);
+        sNotesProjectionMap.put(Notes.NoteColumns.SNIPPET, Notes.NoteColumns.SNIPPET);
+        sNotesProjectionMap.put(Notes.NoteColumns.TYPE, Notes.NoteColumns.TYPE);
+        sNotesProjectionMap.put(Notes.NoteColumns.WIDGET_ID, Notes.NoteColumns.WIDGET_ID);
+        sNotesProjectionMap.put(Notes.NoteColumns.WIDGET_TYPE, Notes.NoteColumns.WIDGET_TYPE);
+        sNotesProjectionMap.put(Notes.NoteColumns.SYNC_ID, Notes.NoteColumns.SYNC_ID);
+        sNotesProjectionMap.put(Notes.NoteColumns.LOCAL_MODIFIED, Notes.NoteColumns.LOCAL_MODIFIED);
+        sNotesProjectionMap.put(Notes.NoteColumns.ORIGIN_PARENT_ID, Notes.NoteColumns.ORIGIN_PARENT_ID);
+        sNotesProjectionMap.put(Notes.NoteColumns.GTASK_ID, Notes.NoteColumns.GTASK_ID);
+        sNotesProjectionMap.put(Notes.NoteColumns.VERSION, Notes.NoteColumns.VERSION);
+
+        // 初始化数据查询投影映射
+        sDataProjectionMap = new HashMap<String, String>();
+        sDataProjectionMap.put(Notes.DataColumns.ID, Notes.DataColumns.ID);
+        sDataProjectionMap.put(Notes.DataColumns.MIME_TYPE, Notes.DataColumns.MIME_TYPE);
+        sDataProjectionMap.put(Notes.DataColumns.NOTE_ID, Notes.DataColumns.NOTE_ID);
+        sDataProjectionMap.put(Notes.DataColumns.CREATED_DATE, Notes.DataColumns.CREATED_DATE);
+        sDataProjectionMap.put(Notes.DataColumns.MODIFIED_DATE, Notes.DataColumns.MODIFIED_DATE);
+        sDataProjectionMap.put(Notes.DataColumns.CONTENT, Notes.DataColumns.CONTENT);
+        sDataProjectionMap.put(Notes.DataColumns.DATA1, Notes.DataColumns.DATA1);
+        sDataProjectionMap.put(Notes.DataColumns.DATA2, Notes.DataColumns.DATA2);
+        sDataProjectionMap.put(Notes.DataColumns.DATA3, Notes.DataColumns.DATA3);
+        sDataProjectionMap.put(Notes.DataColumns.DATA4, Notes.DataColumns.DATA4);
+        sDataProjectionMap.put(Notes.DataColumns.DATA5, Notes.DataColumns.DATA5);
     }
 
     /**
-     * x'0A' represents the '\n' character in sqlite. For title and content in the search result,
-     * we will trim '\n' and white space in order to show more information.
+     * 初始化内容提供者
      */
-    private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + ","
-        + NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + ","
-        + "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_1 + ","
-        + "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_2 + ","
-        + R.drawable.search_result + " AS " + SearchManager.SUGGEST_COLUMN_ICON_1 + ","
-        + "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + ","
-        + "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA;
-
-    private static String NOTES_SNIPPET_SEARCH_QUERY = "SELECT " + NOTES_SEARCH_PROJECTION
-        + " FROM " + TABLE.NOTE
-        + " WHERE " + NoteColumns.SNIPPET + " LIKE ?"
-        + " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER
-        + " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE;
-
     @Override
     public boolean onCreate() {
-        mHelper = NotesDatabaseHelper.getInstance(getContext());
+        mOpenHelper = NotesDatabaseHelper.getInstance(getContext());
+        mContentResolver = getContext().getContentResolver();
         return true;
     }
 
+    /**
+     * 查询便签数据
+     */
     @Override
-    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
-            String sortOrder) {
-        Cursor c = null;
-        SQLiteDatabase db = mHelper.getReadableDatabase();
-        String id = null;
-        switch (mMatcher.match(uri)) {
-            case URI_NOTE:
-                c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null,
-                        sortOrder);
+    public Cursor query(Uri uri, String[] projection, String selection,
+            String[] selectionArgs, String sortOrder) {
+        SQLiteQueryBuilder qb = new SQLiteQueryBuilder();
+        String groupBy = null;
+
+        // 根据URI匹配结果设置查询条件
+        switch (sUriMatcher.match(uri)) {
+            case NOTES:
+                qb.setTables(NotesDatabaseHelper.TABLE.NOTE);
+                qb.setProjectionMap(sNotesProjectionMap);
+                break;
+
+            case NOTE_ID:
+                qb.setTables(NotesDatabaseHelper.TABLE.NOTE);
+                qb.setProjectionMap(sNotesProjectionMap);
+                qb.appendWhere(Notes.NoteColumns.ID + "=" + uri.getPathSegments().get(1));
                 break;
-            case URI_NOTE_ITEM:
-                id = uri.getPathSegments().get(1);
-                c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id
-                        + parseSelection(selection), selectionArgs, null, null, sortOrder);
+
+            case FOLDERS:
+                qb.setTables(NotesDatabaseHelper.TABLE.NOTE);
+                qb.setProjectionMap(sNotesProjectionMap);
+                qb.appendWhere(Notes.NoteColumns.TYPE + "=" + Notes.TypeColumns.TYPE_FOLDER);
                 break;
-            case URI_DATA:
-                c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null,
-                        sortOrder);
+
+            case FOLDER_ID:
+                qb.setTables(NotesDatabaseHelper.TABLE.NOTE);
+                qb.setProjectionMap(sNotesProjectionMap);
+                qb.appendWhere(Notes.NoteColumns.ID + "=" + uri.getPathSegments().get(1));
                 break;
-            case URI_DATA_ITEM:
-                id = uri.getPathSegments().get(1);
-                c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id
-                        + parseSelection(selection), selectionArgs, null, null, sortOrder);
+
+            case DATA:
+                qb.setTables(NotesDatabaseHelper.TABLE.DATA);
+                qb.setProjectionMap(sDataProjectionMap);
                 break;
-            case URI_SEARCH:
-            case URI_SEARCH_SUGGEST:
-                if (sortOrder != null || projection != null) {
-                    throw new IllegalArgumentException(
-                            "do not specify sortOrder, selection, selectionArgs, or projection" + "with this query");
-                }
 
-                String searchString = null;
-                if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
-                    if (uri.getPathSegments().size() > 1) {
-                        searchString = uri.getPathSegments().get(1);
-                    }
-                } else {
-                    searchString = uri.getQueryParameter("pattern");
-                }
+            case DATA_ID:
+                qb.setTables(NotesDatabaseHelper.TABLE.DATA);
+                qb.setProjectionMap(sDataProjectionMap);
+                qb.appendWhere(Notes.DataColumns.ID + "=" + uri.getPathSegments().get(1));
+                break;
 
-                if (TextUtils.isEmpty(searchString)) {
-                    return null;
-                }
+            case DATA_NOTE_ID:
+                qb.setTables(NotesDatabaseHelper.TABLE.DATA);
+                qb.setProjectionMap(sDataProjectionMap);
+                qb.appendWhere(Notes.DataColumns.NOTE_ID + "=" + uri.getPathSegments().get(1));
+                break;
 
-                try {
-                    searchString = String.format("%%%s%%", searchString);
-                    c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY,
-                            new String[] { searchString });
-                } catch (IllegalStateException ex) {
-                    Log.e(TAG, "got exception: " + ex.toString());
-                }
+            case DATA_NOTE_ID_MIME_TYPE:
+                qb.setTables(NotesDatabaseHelper.TABLE.DATA);
+                qb.setProjectionMap(sDataProjectionMap);
+                qb.appendWhere(Notes.DataColumns.NOTE_ID + "=" + uri.getPathSegments().get(1));
+                qb.appendWhere(" AND " + Notes.DataColumns.MIME_TYPE + "='" + 
+                              uri.getPathSegments().get(3) + "'");
                 break;
+
             default:
                 throw new IllegalArgumentException("Unknown URI " + uri);
         }
-        if (c != null) {
-            c.setNotificationUri(getContext().getContentResolver(), uri);
+
+        // 如果没有指定排序方式，使用默认排序
+        String orderBy;
+        if (TextUtils.isEmpty(sortOrder)) {
+            orderBy = Notes.NoteColumns.MODIFIED_DATE + " DESC";
+        } else {
+            orderBy = sortOrder;
         }
+
+        // 获取数据库并执行查询
+        SQLiteDatabase db = mOpenHelper.getReadableDatabase();
+        Cursor c = qb.query(db, projection, selection, selectionArgs, groupBy, null, orderBy);
+
+        // 设置通知URI，当数据变化时通知ContentResolver
+        c.setNotificationUri(mContentResolver, uri);
         return c;
     }
 
+    /**
+     * 获取内容类型
+     */
     @Override
-    public Uri insert(Uri uri, ContentValues values) {
-        SQLiteDatabase db = mHelper.getWritableDatabase();
-        long dataId = 0, noteId = 0, insertedId = 0;
-        switch (mMatcher.match(uri)) {
-            case URI_NOTE:
-                insertedId = noteId = db.insert(TABLE.NOTE, null, values);
-                break;
-            case URI_DATA:
-                if (values.containsKey(DataColumns.NOTE_ID)) {
-                    noteId = values.getAsLong(DataColumns.NOTE_ID);
-                } else {
-                    Log.d(TAG, "Wrong data format without note id:" + values.toString());
-                }
-                insertedId = dataId = db.insert(TABLE.DATA, null, values);
-                break;
+    public String getType(Uri uri) {
+        switch (sUriMatcher.match(uri)) {
+            case NOTES:
+                return Notes.NoteContent.CONTENT_TYPE;
+            case NOTE_ID:
+                return Notes.NoteContent.CONTENT_ITEM_TYPE;
+            case FOLDERS:
+                return Notes.FolderContent.CONTENT_TYPE;
+            case FOLDER_ID:
+                return Notes.FolderContent.CONTENT_ITEM_TYPE;
+            case DATA:
+                return Notes.DataContent.CONTENT_TYPE;
+            case DATA_ID:
+                return Notes.DataContent.CONTENT_ITEM_TYPE;
+            case DATA_NOTE_ID:
+                return Notes.DataContent.CONTENT_TYPE;
+            case DATA_NOTE_ID_MIME_TYPE:
+                return Notes.DataContent.CONTENT_TYPE;
             default:
                 throw new IllegalArgumentException("Unknown URI " + uri);
         }
-        // Notify the note uri
-        if (noteId > 0) {
-            getContext().getContentResolver().notifyChange(
-                    ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null);
+    }
+
+    /**
+     * 插入便签数据
+     */
+    @Override
+    public Uri insert(Uri uri, ContentValues initialValues) {
+        // 确保ContentValues不为空
+        ContentValues values;
+        if (initialValues != null) {
+            values = new ContentValues(initialValues);
+        } else {
+            values = new ContentValues();
         }
 
-        // Notify the data uri
-        if (dataId > 0) {
-            getContext().getContentResolver().notifyChange(
-                    ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null);
+        SQLiteDatabase db = mOpenHelper.getWritableDatabase();
+        long rowId;
+        Uri baseUri;
+
+        // 根据URI匹配结果执行不同的插入操作
+        switch (sUriMatcher.match(uri)) {
+            case NOTES:
+                // 处理父文件夹ID为空的情况
+                if (!values.containsKey(Notes.NoteColumns.PARENT_ID)) {
+                    values.put(Notes.NoteColumns.PARENT_ID, Notes.FolderConstants.ID_ROOT_FOLDER);
+                }
+                
+                // 处理类型为空的情况
+                if (!values.containsKey(Notes.NoteColumns.TYPE)) {
+                    values.put(Notes.NoteColumns.TYPE, Notes.TypeColumns.TYPE_NOTE);
+                }
+                
+                // 处理便签摘要为空的情况
+                if (!values.containsKey(Notes.NoteColumns.SNIPPET)) {
+                    values.put(Notes.NoteColumns.SNIPPET, "");
+                }
+                
+                // 插入便签数据
+                rowId = db.insert(NotesDatabaseHelper.TABLE.NOTE, null, values);
+                if (rowId > 0) {
+                    baseUri = Notes.NoteContent.CONTENT_URI;
+                    Uri newUri = ContentUris.withAppendedId(baseUri, rowId);
+                    mContentResolver.notifyChange(newUri, null);
+                    return newUri;
+                }
+                break;
+
+            case DATA:
+                // 处理关联便签ID为空的情况
+                if (!values.containsKey(Notes.DataColumns.NOTE_ID)) {
+                    throw new IllegalArgumentException("Note ID is required for data insertion");
+                }
+                
+                // 处理MIME类型为空的情况
+                if (!values.containsKey(Notes.DataColumns.MIME_TYPE)) {
+                    throw new IllegalArgumentException("MIME type is required for data insertion");
+                }
+                
+                // 插入便签数据关联
+                rowId = db.insert(NotesDatabaseHelper.TABLE.DATA, null, values);
+                if (rowId > 0) {
+                    baseUri = Notes.DataContent.CONTENT_URI;
+                    Uri newUri = ContentUris.withAppendedId(baseUri, rowId);
+                    
+                    // 如果是提醒类型，更新便签的提醒日期
+                    if (Notes.DataConstants.ALERT.equals(values.getAsString(Notes.DataColumns.MIME_TYPE))) {
+                        long alertDate = values.getAsLong(Notes.DataColumns.DATA1);
+                        updateAlertDate(values.getAsLong(Notes.DataColumns.NOTE_ID), alertDate);
+                    }
+                    
+                    mContentResolver.notifyChange(newUri, null);
+                    return newUri;
+                }
+                break;
+
+            default:
+                throw new IllegalArgumentException("Unknown URI " + uri);
         }
 
-        return ContentUris.withAppendedId(uri, insertedId);
+        throw new IllegalArgumentException("Failed to insert row into " + uri);
     }
 
+    /**
+     * 更新便签数据
+     */
     @Override
-    public int delete(Uri uri, String selection, String[] selectionArgs) {
-        int count = 0;
-        String id = null;
-        SQLiteDatabase db = mHelper.getWritableDatabase();
-        boolean deleteData = false;
-        switch (mMatcher.match(uri)) {
-            case URI_NOTE:
-                selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
-                count = db.delete(TABLE.NOTE, selection, selectionArgs);
+    public int update(Uri uri, ContentValues values, String where, String[] whereArgs) {
+        SQLiteDatabase db = mOpenHelper.getWritableDatabase();
+        int count;
+        String finalWhere;
+
+        // 根据URI匹配结果执行不同的更新操作
+        switch (sUriMatcher.match(uri)) {
+            case NOTES:
+                count = db.update(NotesDatabaseHelper.TABLE.NOTE, values, where, whereArgs);
                 break;
-            case URI_NOTE_ITEM:
-                id = uri.getPathSegments().get(1);
-                /**
-                 * ID that smaller than 0 is system folder which is not allowed to
-                 * trash
-                 */
-                long noteId = Long.valueOf(id);
-                if (noteId <= 0) {
-                    break;
+
+            case NOTE_ID:
+                finalWhere = Notes.NoteColumns.ID + "=" + uri.getPathSegments().get(1);
+                if (where != null) {
+                    finalWhere = finalWhere + " AND " + where;
                 }
-                count = db.delete(TABLE.NOTE,
-                        NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
+                
+                // 如果更新了便签类型，处理特殊情况
+                if (values.containsKey(Notes.NoteColumns.TYPE)) {
+                    int type = values.getAsInteger(Notes.NoteColumns.TYPE);
+                    if (type == Notes.TypeColumns.TYPE_SYSTEM) {
+                        throw new IllegalArgumentException("Can't set note type to system type");
+                    }
+                }
+                
+                count = db.update(NotesDatabaseHelper.TABLE.NOTE, values, finalWhere, whereArgs);
                 break;
-            case URI_DATA:
-                count = db.delete(TABLE.DATA, selection, selectionArgs);
-                deleteData = true;
+
+            case DATA:
+                count = db.update(NotesDatabaseHelper.TABLE.DATA, values, where, whereArgs);
                 break;
-            case URI_DATA_ITEM:
-                id = uri.getPathSegments().get(1);
-                count = db.delete(TABLE.DATA,
-                        DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
-                deleteData = true;
+
+            case DATA_ID:
+                finalWhere = Notes.DataColumns.ID + "=" + uri.getPathSegments().get(1);
+                if (where != null) {
+                    finalWhere = finalWhere + " AND " + where;
+                }
+                
+                // 如果更新了提醒数据，更新便签的提醒日期
+                if (values.containsKey(Notes.DataColumns.MIME_TYPE) && 
+                    Notes.DataConstants.ALERT.equals(values.getAsString(Notes.DataColumns.MIME_TYPE))) {
+                    long alertDate = values.getAsLong(Notes.DataColumns.DATA1);
+                    updateAlertDate(getNoteIdFromDataId(ContentUris.parseId(uri)), alertDate);
+                }
+                
+                count = db.update(NotesDatabaseHelper.TABLE.DATA, values, finalWhere, whereArgs);
                 break;
+
             default:
                 throw new IllegalArgumentException("Unknown URI " + uri);
         }
-        if (count > 0) {
-            if (deleteData) {
-                getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
-            }
-            getContext().getContentResolver().notifyChange(uri, null);
-        }
+
+        // 通知内容解析器数据已更改
+        mContentResolver.notifyChange(uri, null);
         return count;
     }
 
+    /**
+     * 删除便签数据
+     */
     @Override
-    public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
-        int count = 0;
-        String id = null;
-        SQLiteDatabase db = mHelper.getWritableDatabase();
-        boolean updateData = false;
-        switch (mMatcher.match(uri)) {
-            case URI_NOTE:
-                increaseNoteVersion(-1, selection, selectionArgs);
-                count = db.update(TABLE.NOTE, values, selection, selectionArgs);
+    public int delete(Uri uri, String where, String[] whereArgs) {
+        SQLiteDatabase db = mOpenHelper.getWritableDatabase();
+        int count;
+        String finalWhere;
+
+        // 根据URI匹配结果执行不同的删除操作
+        switch (sUriMatcher.match(uri)) {
+            case NOTES:
+                // 不能删除系统文件夹
+                finalWhere = Notes.NoteColumns.TYPE + "!=" + Notes.TypeColumns.TYPE_SYSTEM;
+                if (where != null) {
+                    finalWhere = finalWhere + " AND " + where;
+                }
+                count = db.delete(NotesDatabaseHelper.TABLE.NOTE, finalWhere, whereArgs);
                 break;
-            case URI_NOTE_ITEM:
-                id = uri.getPathSegments().get(1);
-                increaseNoteVersion(Long.valueOf(id), selection, selectionArgs);
-                count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id
-                        + parseSelection(selection), selectionArgs);
+
+            case NOTE_ID:
+                // 不能删除系统文件夹
+                finalWhere = Notes.NoteColumns.ID + "=" + uri.getPathSegments().get(1) +
+                        " AND " + Notes.NoteColumns.TYPE + "!=" + Notes.TypeColumns.TYPE_SYSTEM;
+                if (where != null) {
+                    finalWhere = finalWhere + " AND " + where;
+                }
+                
+                // 如果删除的是带有提醒的便签，先清除提醒日期
+                clearAlertDate(ContentUris.parseId(uri));
+                
+                count = db.delete(NotesDatabaseHelper.TABLE.NOTE, finalWhere, whereArgs);
                 break;
-            case URI_DATA:
-                count = db.update(TABLE.DATA, values, selection, selectionArgs);
-                updateData = true;
+
+            case DATA:
+                count = db.delete(NotesDatabaseHelper.TABLE.DATA, where, whereArgs);
                 break;
-            case URI_DATA_ITEM:
-                id = uri.getPathSegments().get(1);
-                count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id
-                        + parseSelection(selection), selectionArgs);
-                updateData = true;
+
+            case DATA_ID:
+                finalWhere = Notes.DataColumns.ID + "=" + uri.getPathSegments().get(1);
+                if (where != null) {
+                    finalWhere = finalWhere + " AND " + where;
+                }
+                
+                // 如果删除的是提醒数据，清除便签的提醒日期
+                clearAlertDate(getNoteIdFromDataId(ContentUris.parseId(uri)));
+                
+                count = db.delete(NotesDatabaseHelper.TABLE.DATA, finalWhere, whereArgs);
                 break;
+
             default:
                 throw new IllegalArgumentException("Unknown URI " + uri);
         }
 
-        if (count > 0) {
-            if (updateData) {
-                getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
-            }
-            getContext().getContentResolver().notifyChange(uri, null);
-        }
+        // 通知内容解析器数据已更改
+        mContentResolver.notifyChange(uri, null);
         return count;
     }
 
-    private String parseSelection(String selection) {
-        return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
+    /**
+     * 更新便签的提醒日期
+     */
+    private void updateAlertDate(long noteId, long alertDate) {
+        ContentValues values = new ContentValues();
+        values.put(Notes.NoteColumns.ALERTED_DATE, alertDate);
+        values.put(Notes.NoteColumns.LOCAL_MODIFIED, 1);
+        
+        SQLiteDatabase db = mOpenHelper.getWritableDatabase();
+        db.update(NotesDatabaseHelper.TABLE.NOTE, values, 
+                Notes.NoteColumns.ID + "=" + noteId, null);
     }
 
-    private void increaseNoteVersion(long id, String selection, String[] selectionArgs) {
-        StringBuilder sql = new StringBuilder(120);
-        sql.append("UPDATE ");
-        sql.append(TABLE.NOTE);
-        sql.append(" SET ");
-        sql.append(NoteColumns.VERSION);
-        sql.append("=" + NoteColumns.VERSION + "+1 ");
+    /**
+     * 清除便签的提醒日期
+     */
+    private void clearAlertDate(long noteId) {
+        ContentValues values = new ContentValues();
+        values.put(Notes.NoteColumns.ALERTED_DATE, 0);
+        values.put(Notes.NoteColumns.LOCAL_MODIFIED, 1);
+        
+        SQLiteDatabase db = mOpenHelper.getWritableDatabase();
+        db.update(NotesDatabaseHelper.TABLE.NOTE, values, 
+                Notes.NoteColumns.ID + "=" + noteId, null);
+    }
 
-        if (id > 0 || !TextUtils.isEmpty(selection)) {
-            sql.append(" WHERE ");
-        }
-        if (id > 0) {
-            sql.append(NoteColumns.ID + "=" + String.valueOf(id));
-        }
-        if (!TextUtils.isEmpty(selection)) {
-            String selectString = id > 0 ? parseSelection(selection) : selection;
-            for (String args : selectionArgs) {
-                selectString = selectString.replaceFirst("\\?", args);
+    /**
+     * 从数据ID获取关联的便签ID
+     */
+    private long getNoteIdFromDataId(long dataId) {
+        String[] projection = new String[] { Notes.DataColumns.NOTE_ID };
+        String selection = Notes.DataColumns.ID + " = ?";
+        String[] selectionArgs = new String[] { String.valueOf(dataId) };
+        
+        SQLiteDatabase db = mOpenHelper.getReadableDatabase();
+        Cursor cursor = db.query(NotesDatabaseHelper.TABLE.DATA, projection, 
+                selection, selectionArgs, null, null, null);
+        
+        long noteId = -1;
+        if (cursor != null) {
+            if (cursor.moveToFirst()) {
+                noteId = cursor.getLong(0);
             }
-            sql.append(selectString);
+            cursor.close();
         }
-
-        mHelper.getWritableDatabase().execSQL(sql.toString());
+        
+        return noteId;
     }
-
-    @Override
-    public String getType(Uri uri) {
-        // TODO Auto-generated method stub
-        return null;
-    }
-
 }