diff --git a/.idea/misc.xml b/.idea/misc.xml index 7730797..51e2c35 100644 --- a/.idea/misc.xml +++ b/.idea/misc.xml @@ -3,7 +3,7 @@ - + \ No newline at end of file diff --git a/src/net/micode/notes/data/Contact.java b/src/net/micode/notes/data/Contact.java index d97ac5d..6d700c8 100644 --- a/src/net/micode/notes/data/Contact.java +++ b/src/net/micode/notes/data/Contact.java @@ -26,48 +26,65 @@ import android.util.Log; import java.util.HashMap; public class Contact { + // 联系人缓存：电话号码 -> 联系人名称 private static HashMap sContactCache; private static final String TAG = "Contact"; + // 联系人查询条件：匹配电话号码并关联到正确的MIME类型 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 " + + ",?) AND " + Data.MIMETYPE + "='" + Phone.CONTENT_ITEM_TYPE + "'" + + " AND " + Data.RAW_CONTACT_ID + " IN " + "(SELECT raw_contact_id " + " FROM phone_lookup" + " WHERE min_match = '+')"; + /** + * 根据电话号码获取联系人名称（支持缓存机制） + * + * @param context 应用上下文 + * @param phoneNumber 待查询的电话号码 + * @return 联系人名称，如果未找到则返回null + */ public static String getContact(Context context, String phoneNumber) { + // 初始化联系人缓存 if(sContactCache == null) { sContactCache = new HashMap(); } + // 优先从缓存中获取联系人名称 if(sContactCache.containsKey(phoneNumber)) { return sContactCache.get(phoneNumber); } + // 构建查询条件（替换占位符为实际的最小匹配值） String selection = CALLER_ID_SELECTION.replace("+", PhoneNumberUtils.toCallerIDMinMatch(phoneNumber)); + + // 执行联系人数据库查询 Cursor cursor = context.getContentResolver().query( - Data.CONTENT_URI, - new String [] { Phone.DISPLAY_NAME }, - selection, - new String[] { phoneNumber }, - null); + Data.CONTENT_URI, // 查询联系人数据URI + new String [] { Phone.DISPLAY_NAME }, // 只需要显示名称字段 + selection, // 使用构建好的查询条件 + new String[] { phoneNumber }, // 查询参数（电话号码） + null); // 不指定排序 + // 处理查询结果 if (cursor != null && cursor.moveToFirst()) { try { + // 获取联系人名称并加入缓存 String name = cursor.getString(0); sContactCache.put(phoneNumber, name); return name; } catch (IndexOutOfBoundsException e) { - Log.e(TAG, " Cursor get string error " + e.toString()); + Log.e(TAG, "从Cursor获取字符串时出错: " + e.toString()); return null; } finally { + // 确保关闭Cursor释放资源 cursor.close(); } } else { - Log.d(TAG, "No contact matched with number:" + phoneNumber); + Log.d(TAG, "未找到匹配号码的联系人: " + phoneNumber); return null; } } -} +} \ No newline at end of file diff --git a/src/net/micode/notes/data/Notes.java b/src/net/micode/notes/data/Notes.java index f240604..2f9390f 100644 --- a/src/net/micode/notes/data/Notes.java +++ b/src/net/micode/notes/data/Notes.java @@ -18,262 +18,281 @@ package net.micode.notes.data; import android.net.Uri; public class Notes { + // 内容提供者的授权字符串 public static final String AUTHORITY = "micode_notes"; + // 日志标签 public static final String TAG = "Notes"; + // 笔记类型常量 public static final int TYPE_NOTE = 0; + // 文件夹类型常量 public static final int TYPE_FOLDER = 1; + // 系统类型常量 public static final int TYPE_SYSTEM = 2; /** - * 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 + * 以下ID是系统文件夹的标识符 + * {@link Notes#ID_ROOT_FOLDER } 是默认文件夹 + * {@link Notes#ID_TEMPARAY_FOLDER } 用于不属于任何文件夹的笔记 + * {@link Notes#ID_CALL_RECORD_FOLDER} 用于存储通话记录 */ 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; + // 提醒日期的Intent额外数据键 public static final String INTENT_EXTRA_ALERT_DATE = "net.micode.notes.alert_date"; + // 背景ID的Intent额外数据键 public static final String INTENT_EXTRA_BACKGROUND_ID = "net.micode.notes.background_color_id"; + // 小部件ID的Intent额外数据键 public static final String INTENT_EXTRA_WIDGET_ID = "net.micode.notes.widget_id"; + // 小部件类型的Intent额外数据键 public static final String INTENT_EXTRA_WIDGET_TYPE = "net.micode.notes.widget_type"; + // 文件夹ID的Intent额外数据键 public static final String INTENT_EXTRA_FOLDER_ID = "net.micode.notes.folder_id"; + // 通话日期的Intent额外数据键 public static final String INTENT_EXTRA_CALL_DATE = "net.micode.notes.call_date"; + // 无效小部件类型常量 public static final int TYPE_WIDGET_INVALIDE = -1; + // 2x大小的小部件类型常量 public static final int TYPE_WIDGET_2X = 0; + // 4x大小的小部件类型常量 public static final int TYPE_WIDGET_4X = 1; public static class DataConstants { + // 文本笔记的MIME类型 public static final String NOTE = TextNote.CONTENT_ITEM_TYPE; + // 通话笔记的MIME类型 public static final String CALL_NOTE = CallNote.CONTENT_ITEM_TYPE; } /** - * Uri to query all notes and folders + * 用于查询所有笔记和文件夹的Uri */ public static final Uri CONTENT_NOTE_URI = Uri.parse("content://" + AUTHORITY + "/note"); /** - * Uri to query data + * 用于查询数据的Uri */ public static final Uri CONTENT_DATA_URI = Uri.parse("content://" + AUTHORITY + "/data"); + // 笔记表的列定义 public interface NoteColumns { /** - * The unique ID for a row - *

Type: INTEGER (long)

+ * 行的唯一ID + *

类型: INTEGER (长整型)

*/ public static final String ID = "_id"; /** - * The parent's id for note or folder - *

Type: INTEGER (long)

+ * 笔记或文件夹的父ID + *

类型: INTEGER (长整型)

*/ public static final String PARENT_ID = "parent_id"; /** - * Created data for note or folder - *

Type: INTEGER (long)

+ * 笔记或文件夹的创建日期 + *

类型: INTEGER (长整型)

*/ public static final String CREATED_DATE = "created_date"; /** - * Latest modified date - *

Type: INTEGER (long)

+ * 最新修改日期 + *

类型: INTEGER (长整型)

*/ public static final String MODIFIED_DATE = "modified_date"; - /** - * Alert date - *

Type: INTEGER (long)

+ * 提醒日期 + *

类型: INTEGER (长整型)

*/ public static final String ALERTED_DATE = "alert_date"; /** - * Folder's name or text content of note - *

Type: TEXT

+ * 文件夹名称或笔记的文本内容 + *

类型: TEXT

*/ public static final String SNIPPET = "snippet"; /** - * Note's widget id - *

Type: INTEGER (long)

+ * 笔记的小部件ID + *

类型: INTEGER (长整型)

*/ public static final String WIDGET_ID = "widget_id"; /** - * Note's widget type - *

Type: INTEGER (long)

+ * 笔记的小部件类型 + *

类型: INTEGER (长整型)

*/ public static final String WIDGET_TYPE = "widget_type"; /** - * Note's background color's id - *

Type: INTEGER (long)

+ * 笔记的背景颜色ID + *

类型: INTEGER (长整型)

*/ public static final String BG_COLOR_ID = "bg_color_id"; /** - * For text note, it doesn't has attachment, for multi-media - * note, it has at least one attachment - *

Type: INTEGER

+ * 对于文本笔记，没有附件；对于多媒体笔记，至少有一个附件 + *

类型: INTEGER

*/ public static final String HAS_ATTACHMENT = "has_attachment"; /** - * Folder's count of notes - *

Type: INTEGER (long)

+ * 文件夹中笔记的数量 + *

类型: INTEGER (长整型)

*/ public static final String NOTES_COUNT = "notes_count"; /** - * The file type: folder or note - *

Type: INTEGER

+ * 文件类型：文件夹或笔记 + *

类型: INTEGER

*/ public static final String TYPE = "type"; /** - * The last sync id - *

Type: INTEGER (long)

+ * 最后同步ID + *

类型: INTEGER (长整型)

*/ public static final String SYNC_ID = "sync_id"; /** - * Sign to indicate local modified or not - *

Type: INTEGER

+ * 标记是否本地修改 + *

类型: INTEGER

*/ public static final String LOCAL_MODIFIED = "local_modified"; /** - * Original parent id before moving into temporary folder - *

Type : INTEGER

+ * 移动到临时文件夹前的原始父ID + *

类型 : INTEGER

*/ public static final String ORIGIN_PARENT_ID = "origin_parent_id"; /** - * The gtask id - *

Type : TEXT

+ * Google任务ID + *

类型 : TEXT

*/ public static final String GTASK_ID = "gtask_id"; /** - * The version code - *

Type : INTEGER (long)

+ * 版本号 + *

类型 : INTEGER (长整型)

*/ public static final String VERSION = "version"; } + // 数据表的列定义 public interface DataColumns { /** - * The unique ID for a row - *

Type: INTEGER (long)

+ * 行的唯一ID + *

类型: INTEGER (长整型)

*/ public static final String ID = "_id"; /** - * The MIME type of the item represented by this row. - *

Type: Text

+ * 此行表示的项目的MIME类型 + *

类型: Text

*/ public static final String MIME_TYPE = "mime_type"; /** - * The reference id to note that this data belongs to - *

Type: INTEGER (long)

+ * 此数据所属笔记的引用ID + *

类型: INTEGER (长整型)

*/ public static final String NOTE_ID = "note_id"; /** - * Created data for note or folder - *

Type: INTEGER (long)

+ * 笔记或文件夹的创建日期 + *

类型: INTEGER (长整型)

*/ public static final String CREATED_DATE = "created_date"; /** - * Latest modified date - *

Type: INTEGER (long)

+ * 最新修改日期 + *

类型: INTEGER (长整型)

*/ public static final String MODIFIED_DATE = "modified_date"; /** - * Data's content - *

Type: TEXT

+ * 数据内容 + *

类型: TEXT

*/ public static final String CONTENT = "content"; - /** - * Generic data column, the meaning is {@link #MIMETYPE} specific, used for - * integer data type - *

Type: INTEGER

+ * 通用数据列，含义由{@link #MIMETYPE}指定，用于整型数据类型 + *

类型: INTEGER

*/ public static final String DATA1 = "data1"; /** - * Generic data column, the meaning is {@link #MIMETYPE} specific, used for - * integer data type - *

Type: INTEGER

+ * 通用数据列，含义由{@link #MIMETYPE}指定，用于整型数据类型 + *

类型: INTEGER

*/ public static final String DATA2 = "data2"; /** - * Generic data column, the meaning is {@link #MIMETYPE} specific, used for - * TEXT data type - *

Type: TEXT

+ * 通用数据列，含义由{@link #MIMETYPE}指定，用于文本数据类型 + *

类型: TEXT

*/ public static final String DATA3 = "data3"; /** - * Generic data column, the meaning is {@link #MIMETYPE} specific, used for - * TEXT data type - *

Type: TEXT

+ * 通用数据列，含义由{@link #MIMETYPE}指定，用于文本数据类型 + *

类型: TEXT

*/ public static final String DATA4 = "data4"; /** - * Generic data column, the meaning is {@link #MIMETYPE} specific, used for - * TEXT data type - *

Type: TEXT

+ * 通用数据列，含义由{@link #MIMETYPE}指定，用于文本数据类型 + *

类型: TEXT

*/ public static final String DATA5 = "data5"; } + // 文本笔记类，继承自DataColumns public static final class TextNote implements DataColumns { /** - * Mode to indicate the text in check list mode or not - *

Type: Integer 1:check list mode 0: normal mode

+ * 模式，指示文本是否处于复选列表模式 + *

类型: Integer 1:复选列表模式 0:普通模式

*/ public static final String MODE = DATA1; + // 复选列表模式常量 public static final int MODE_CHECK_LIST = 1; + // 内容类型 public static final String CONTENT_TYPE = "vnd.android.cursor.dir/text_note"; + // 内容项类型 public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/text_note"; + // 内容Uri public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/text_note"); } + // 通话记录类，继承自DataColumns public static final class CallNote implements DataColumns { /** - * Call date for this record - *

Type: INTEGER (long)

+ * 此记录的通话日期 + *

类型: INTEGER (长整型)

*/ public static final String CALL_DATE = DATA1; /** - * Phone number for this record - *

Type: TEXT

+ * 此记录的电话号码 + *

类型: TEXT

*/ public static final String PHONE_NUMBER = DATA3; + // 内容类型 public static final String CONTENT_TYPE = "vnd.android.cursor.dir/call_note"; + // 内容项类型 public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/call_note"; + // 内容Uri public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/call_note"); } -} +} \ No newline at end of file diff --git a/src/net/micode/notes/data/NotesDatabaseHelper.java b/src/net/micode/notes/data/NotesDatabaseHelper.java index ffe5d57..9356b7e 100644 --- a/src/net/micode/notes/data/NotesDatabaseHelper.java +++ b/src/net/micode/notes/data/NotesDatabaseHelper.java @@ -1,17 +1,15 @@ /* * 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 + * 受Apache许可证2.0版（"许可证"）的约束； + * 除非遵守许可证，否则不得使用此文件。 + * 您可以在以下网址获取许可证副本： * * 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. + * 除非适用法律要求或书面同意，否则根据许可证分发的软件按"原样"分发， + * 不附带任何明示或暗示的保证或条件。 + * 请参阅许可证，了解管理权限和限制的具体语言。 */ package net.micode.notes.data; @@ -28,196 +26,217 @@ import net.micode.notes.data.Notes.NoteColumns; public class NotesDatabaseHelper extends SQLiteOpenHelper { + // 数据库名称 private static final String DB_NAME = "note.db"; + // 数据库版本号 private static final int DB_VERSION = 4; + // 表名接口定义 public interface TABLE { - public static final String NOTE = "note"; - - public static final String DATA = "data"; + public static final String NOTE = "note"; // 笔记表 + public static final String DATA = "data"; // 数据附表 } + // 日志标签 private static final String TAG = "NotesDatabaseHelper"; + // 单例实例 private static NotesDatabaseHelper mInstance; + // 创建笔记表的SQL语句 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.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," + - NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + - NoteColumns.NOTES_COUNT + " INTEGER NOT NULL DEFAULT 0," + - NoteColumns.SNIPPET + " TEXT NOT NULL DEFAULT ''," + - NoteColumns.TYPE + " INTEGER NOT NULL DEFAULT 0," + - NoteColumns.WIDGET_ID + " INTEGER NOT NULL DEFAULT 0," + - NoteColumns.WIDGET_TYPE + " INTEGER NOT NULL DEFAULT -1," + - NoteColumns.SYNC_ID + " INTEGER NOT NULL DEFAULT 0," + - NoteColumns.LOCAL_MODIFIED + " INTEGER NOT NULL DEFAULT 0," + - NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," + - NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''," + - NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" + - ")"; - + "CREATE TABLE " + TABLE.NOTE + "(" + + NoteColumns.ID + " INTEGER PRIMARY KEY," + // 主键ID + NoteColumns.PARENT_ID + " INTEGER NOT NULL DEFAULT 0," + // 父文件夹ID + NoteColumns.ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," +// 提醒日期 + NoteColumns.BG_COLOR_ID + " INTEGER NOT NULL DEFAULT 0," + // 背景颜色ID + // 创建时间（默认值为当前时间戳，单位毫秒） + NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + + NoteColumns.HAS_ATTACHMENT + " INTEGER NOT NULL DEFAULT 0," + // 是否有附件 + // 修改时间（默认值为当前时间戳，单位毫秒） + NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + + NoteColumns.NOTES_COUNT + " INTEGER NOT NULL DEFAULT 0," + // 子笔记数量 + NoteColumns.SNIPPET + " TEXT NOT NULL DEFAULT ''," + // 内容摘要/文件夹名称 + NoteColumns.TYPE + " INTEGER NOT NULL DEFAULT 0," + // 类型（笔记/文件夹/系统） + NoteColumns.WIDGET_ID + " INTEGER NOT NULL DEFAULT 0," + // 小部件ID + NoteColumns.WIDGET_TYPE + " INTEGER NOT NULL DEFAULT -1," +// 小部件类型 + NoteColumns.SYNC_ID + " INTEGER NOT NULL DEFAULT 0," + // 同步ID + NoteColumns.LOCAL_MODIFIED + " INTEGER NOT NULL DEFAULT 0," + // 本地修改标记 + NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," + // 原始父ID + NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''," + // Google任务ID + NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" + // 版本号 + ")"; + + // 创建数据附表的SQL语句 private static final String CREATE_DATA_TABLE_SQL = - "CREATE TABLE " + TABLE.DATA + "(" + - DataColumns.ID + " INTEGER PRIMARY KEY," + - DataColumns.MIME_TYPE + " TEXT NOT NULL," + - 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.DATA4 + " TEXT NOT NULL DEFAULT ''," + - DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" + - ")"; - + "CREATE TABLE " + TABLE.DATA + "(" + + DataColumns.ID + " INTEGER PRIMARY KEY," + // 主键ID + DataColumns.MIME_TYPE + " TEXT NOT NULL," + // MIME类型 + DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0," + // 所属笔记ID + // 创建时间（默认值为当前时间戳，单位毫秒） + NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + + // 修改时间（默认值为当前时间戳，单位毫秒） + NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + + DataColumns.CONTENT + " TEXT NOT NULL DEFAULT ''," + // 内容 + DataColumns.DATA1 + " INTEGER," + // 通用数据1（整型） + DataColumns.DATA2 + " INTEGER," + // 通用数据2（整型） + DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," + // 通用数据3（文本） + DataColumns.DATA4 + " TEXT NOT NULL DEFAULT ''," + // 通用数据4（文本） + DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" + // 通用数据5（文本） + ")"; + + // 创建数据附表NOTE_ID索引的SQL语句 private static final String CREATE_DATA_NOTE_ID_INDEX_SQL = - "CREATE INDEX IF NOT EXISTS note_id_index ON " + - TABLE.DATA + "(" + DataColumns.NOTE_ID + ");"; + "CREATE INDEX IF NOT EXISTS note_id_index ON " + + TABLE.DATA + "(" + DataColumns.NOTE_ID + ");"; // 按所属笔记ID创建索引 /** - * Increase folder's note count when move note to the folder + * 触发器：当笔记更新父文件夹时，增加目标文件夹的笔记数量 */ private static final String NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER = - "CREATE TRIGGER increase_folder_count_on_update "+ - " AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE + - " BEGIN " + - " UPDATE " + TABLE.NOTE + - " SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" + - " WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" + - " END"; + "CREATE TRIGGER increase_folder_count_on_update "+ + " AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE + + " BEGIN " + + " UPDATE " + TABLE.NOTE + + " SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" + + " WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" + // new表示更新后的行 + " END"; /** - * Decrease folder's note count when move note from folder + * 触发器：当笔记更新父文件夹时，减少原文件夹的笔记数量 */ private static final String NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER = - "CREATE TRIGGER decrease_folder_count_on_update " + - " AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE + - " BEGIN " + - " UPDATE " + TABLE.NOTE + - " SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" + - " WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID + - " AND " + NoteColumns.NOTES_COUNT + ">0" + ";" + - " END"; + "CREATE TRIGGER decrease_folder_count_on_update " + + " AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE + + " BEGIN " + + " UPDATE " + TABLE.NOTE + + " SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" + + " WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID + // old表示更新前的行 + " AND " + NoteColumns.NOTES_COUNT + ">0" + ";" + + " END"; /** - * Increase folder's note count when insert new note to the folder + * 触发器：当插入新笔记时，增加目标文件夹的笔记数量 */ private static final String NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER = - "CREATE TRIGGER increase_folder_count_on_insert " + - " AFTER INSERT ON " + TABLE.NOTE + - " BEGIN " + - " UPDATE " + TABLE.NOTE + - " SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" + - " WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" + - " END"; + "CREATE TRIGGER increase_folder_count_on_insert " + + " AFTER INSERT ON " + TABLE.NOTE + + " BEGIN " + + " UPDATE " + TABLE.NOTE + + " SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" + + " WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" + + " END"; /** - * Decrease folder's note count when delete note from the folder + * 触发器：当删除笔记时，减少原文件夹的笔记数量 */ private static final String NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER = - "CREATE TRIGGER decrease_folder_count_on_delete " + - " AFTER DELETE ON " + TABLE.NOTE + - " BEGIN " + - " UPDATE " + TABLE.NOTE + - " SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" + - " WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID + - " AND " + NoteColumns.NOTES_COUNT + ">0;" + - " END"; + "CREATE TRIGGER decrease_folder_count_on_delete " + + " AFTER DELETE ON " + TABLE.NOTE + + " BEGIN " + + " UPDATE " + TABLE.NOTE + + " SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" + + " WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID + + " AND " + NoteColumns.NOTES_COUNT + ">0;" + + " END"; /** - * Update note's content when insert data with type {@link DataConstants#NOTE} + * 触发器：当插入文本笔记数据时，更新笔记的内容摘要 */ private static final String DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER = - "CREATE TRIGGER update_note_content_on_insert " + - " AFTER INSERT ON " + TABLE.DATA + - " WHEN new." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" + - " BEGIN" + - " UPDATE " + TABLE.NOTE + - " SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT + - " WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" + - " END"; + "CREATE TRIGGER update_note_content_on_insert " + + " AFTER INSERT ON " + TABLE.DATA + + " WHEN new." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" + // 仅处理文本笔记类型 + " BEGIN" + + " UPDATE " + TABLE.NOTE + + " SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT + // 用新数据的内容更新笔记摘要 + " WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" + + " END"; /** - * Update note's content when data with {@link DataConstants#NOTE} type has changed + * 触发器：当更新文本笔记数据时，更新笔记的内容摘要 */ private static final String DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER = - "CREATE TRIGGER update_note_content_on_update " + - " AFTER UPDATE ON " + TABLE.DATA + - " WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" + - " BEGIN" + - " UPDATE " + TABLE.NOTE + - " SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT + - " WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" + - " END"; + "CREATE TRIGGER update_note_content_on_update " + + " AFTER UPDATE ON " + TABLE.DATA + + " WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" + // 仅处理文本笔记类型 + " BEGIN" + + " UPDATE " + TABLE.NOTE + + " SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT + // 用新数据的内容更新笔记摘要 + " WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" + + " END"; /** - * Update note's content when data with {@link DataConstants#NOTE} type has deleted + * 触发器：当删除文本笔记数据时，清空笔记的内容摘要 */ private static final String DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER = - "CREATE TRIGGER update_note_content_on_delete " + - " AFTER delete ON " + TABLE.DATA + - " WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" + - " BEGIN" + - " UPDATE " + TABLE.NOTE + - " SET " + NoteColumns.SNIPPET + "=''" + - " WHERE " + NoteColumns.ID + "=old." + DataColumns.NOTE_ID + ";" + - " END"; + "CREATE TRIGGER update_note_content_on_delete " + + " AFTER DELETE ON " + TABLE.DATA + + " WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" + // 仅处理文本笔记类型 + " BEGIN" + + " UPDATE " + TABLE.NOTE + + " SET " + NoteColumns.SNIPPET + "=''" + // 清空摘要 + " WHERE " + NoteColumns.ID + "=old." + DataColumns.NOTE_ID + ";" + + " END"; /** - * Delete datas belong to note which has been deleted + * 触发器：当删除笔记时，级联删除该笔记的所有附属数据 */ private static final String NOTE_DELETE_DATA_ON_DELETE_TRIGGER = - "CREATE TRIGGER delete_data_on_delete " + - " AFTER DELETE ON " + TABLE.NOTE + - " BEGIN" + - " DELETE FROM " + TABLE.DATA + - " WHERE " + DataColumns.NOTE_ID + "=old." + NoteColumns.ID + ";" + - " END"; + "CREATE TRIGGER delete_data_on_delete " + + " AFTER DELETE ON " + TABLE.NOTE + + " BEGIN" + + " DELETE FROM " + TABLE.DATA + + " WHERE " + DataColumns.NOTE_ID + "=old." + NoteColumns.ID + ";" + // 删除关联数据 + " END"; /** - * Delete notes belong to folder which has been deleted + * 触发器：当删除文件夹时，级联删除该文件夹下的所有笔记 */ private static final String FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER = - "CREATE TRIGGER folder_delete_notes_on_delete " + - " AFTER DELETE ON " + TABLE.NOTE + - " BEGIN" + - " DELETE FROM " + TABLE.NOTE + - " WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" + - " END"; + "CREATE TRIGGER folder_delete_notes_on_delete " + + " AFTER DELETE ON " + TABLE.NOTE + + " BEGIN" + + " DELETE FROM " + TABLE.NOTE + + " WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" + // 删除子笔记 + " END"; /** - * Move notes belong to folder which has been moved to trash folder + * 触发器：当文件夹被移动到回收站时，递归移动其子笔记到回收站 */ private static final String FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER = - "CREATE TRIGGER folder_move_notes_on_trash " + - " AFTER UPDATE ON " + TABLE.NOTE + - " WHEN new." + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER + - " BEGIN" + - " UPDATE " + TABLE.NOTE + - " SET " + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER + - " WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" + - " END"; - + "CREATE TRIGGER folder_move_notes_on_trash " + + " AFTER UPDATE ON " + TABLE.NOTE + + " WHEN new." + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER + // 父ID变为回收站ID + " BEGIN" + + " UPDATE " + TABLE.NOTE + + " SET " + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER + // 子笔记的父ID同步为回收站ID + " WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" + // 原父ID为当前文件夹ID + " END"; + + // 构造方法：初始化数据库帮助类 public NotesDatabaseHelper(Context context) { super(context, DB_NAME, null, DB_VERSION); } + /** + * 创建笔记表及相关数据 + * @param db 数据库实例 + */ public void createNoteTable(SQLiteDatabase db) { - db.execSQL(CREATE_NOTE_TABLE_SQL); - reCreateNoteTableTriggers(db); - createSystemFolder(db); + db.execSQL(CREATE_NOTE_TABLE_SQL); // 创建笔记表 + reCreateNoteTableTriggers(db); // 创建相关触发器 + createSystemFolder(db); // 创建系统默认文件夹 Log.d(TAG, "note table has been created"); } + /** + * 重建笔记表相关触发器（先删除旧触发器再创建新触发器） + * @param db 数据库实例 + */ private void reCreateNoteTableTriggers(SQLiteDatabase db) { + // 删除旧触发器 db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_update"); db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_update"); db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_delete"); @@ -226,6 +245,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { db.execSQL("DROP TRIGGER IF EXISTS folder_delete_notes_on_delete"); db.execSQL("DROP TRIGGER IF EXISTS folder_move_notes_on_trash"); + // 创建新触发器 db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER); db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER); db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER); @@ -235,58 +255,69 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER); } + /** + * 创建系统默认文件夹（通话记录、根目录、临时文件夹、回收站） + * @param db 数据库实例 + */ private void createSystemFolder(SQLiteDatabase db) { ContentValues values = new ContentValues(); - /** - * call record foler for call notes - */ + // 创建通话记录文件夹 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 - */ + // 创建根文件夹 values.clear(); values.put(NoteColumns.ID, Notes.ID_ROOT_FOLDER); values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); db.insert(TABLE.NOTE, null, values); - /** - * temporary folder which is used for moving note - */ + // 创建临时文件夹 values.clear(); values.put(NoteColumns.ID, Notes.ID_TEMPARAY_FOLDER); values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); db.insert(TABLE.NOTE, null, values); - /** - * create trash folder - */ + // 创建回收站文件夹 values.clear(); values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER); values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); db.insert(TABLE.NOTE, null, values); } + /** + * 创建数据附表及相关索引和触发器 + * @param db 数据库实例 + */ public void createDataTable(SQLiteDatabase db) { - db.execSQL(CREATE_DATA_TABLE_SQL); - reCreateDataTableTriggers(db); - db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL); + db.execSQL(CREATE_DATA_TABLE_SQL); // 创建数据附表 + reCreateDataTableTriggers(db); // 创建相关触发器 + db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL); // 创建索引 Log.d(TAG, "data table has been created"); } + /** + * 重建数据附表相关触发器（先删除旧触发器再创建新触发器） + * @param db 数据库实例 + */ private void reCreateDataTableTriggers(SQLiteDatabase db) { + // 删除旧触发器 db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_insert"); db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_update"); db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_delete"); + // 创建新触发器 db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER); db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER); db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER); } + /** + * 获取单例实例（线程安全） + * @param context 上下文 + * @return NotesDatabaseHelper实例 + */ static synchronized NotesDatabaseHelper getInstance(Context context) { if (mInstance == null) { mInstance = new NotesDatabaseHelper(context); @@ -294,69 +325,11 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { return mInstance; } + /** + * 数据库创建回调（首次创建时调用） + * @param db 数据库实例 + */ @Override public void onCreate(SQLiteDatabase db) { - createNoteTable(db); - createDataTable(db); - } - - @Override - public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { - boolean reCreateTriggers = false; - boolean skipV2 = false; - - if (oldVersion == 1) { - upgradeToV2(db); - skipV2 = true; // this upgrade including the upgrade from v2 to v3 - oldVersion++; - } - - if (oldVersion == 2 && !skipV2) { - upgradeToV3(db); - reCreateTriggers = true; - oldVersion++; - } - - if (oldVersion == 3) { - upgradeToV4(db); - oldVersion++; - } - - if (reCreateTriggers) { - reCreateNoteTableTriggers(db); - reCreateDataTableTriggers(db); - } - - if (oldVersion != newVersion) { - throw new IllegalStateException("Upgrade notes database to version " + newVersion - + "fails"); - } - } - - private void upgradeToV2(SQLiteDatabase db) { - db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE); - db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA); - createNoteTable(db); - createDataTable(db); - } - - private void upgradeToV3(SQLiteDatabase db) { - // drop unused triggers - 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 - db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID - + " TEXT NOT NULL DEFAULT ''"); - // add a trash system folder - 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); - } - - private void upgradeToV4(SQLiteDatabase db) { - db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION - + " INTEGER NOT NULL DEFAULT 0"); - } -} + createNoteTable(db); // 创建笔记表及相关数据 + createDataTable(db); // 创建数据附表及 \ No newline at end of file diff --git a/src/net/micode/notes/data/NotesProvider.java b/src/net/micode/notes/data/NotesProvider.java index edb0a60..3a1a1a7 100644 --- a/src/net/micode/notes/data/NotesProvider.java +++ b/src/net/micode/notes/data/NotesProvider.java @@ -1,17 +1,15 @@ /* * 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 + * 受Apache许可证2.0版（"许可证"）的约束； + * 除非遵守许可证，否则不得使用此文件。 + * 您可以在以下网址获取许可证副本： * * 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. + * 除非适用法律要求或书面同意，否则根据许可证分发的软件按"原样"分发， + * 不附带任何明示或暗示的保证或条件。 + * 请参阅许可证，了解管理权限和限制的具体语言。 */ package net.micode.notes.data; @@ -36,88 +34,121 @@ import net.micode.notes.data.NotesDatabaseHelper.TABLE; public class NotesProvider extends ContentProvider { + // Uri匹配器，用于解析不同的URI请求 private static final UriMatcher mMatcher; + // 数据库帮助类实例，用于管理数据库连接 private NotesDatabaseHelper mHelper; + // 日志标签 private static final String TAG = "NotesProvider"; - 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; - - private static final int URI_SEARCH = 5; - private static final int URI_SEARCH_SUGGEST = 6; + // URI匹配常量定义 + private static final int URI_NOTE = 1; // 笔记集合URI + private static final int URI_NOTE_ITEM = 2; // 单条笔记URI + private static final int URI_DATA = 3; // 数据集合URI + private static final int URI_DATA_ITEM = 4; // 单条数据URI + private static final int URI_SEARCH = 5; // 搜索URI + private static final int URI_SEARCH_SUGGEST = 6; // 搜索建议URI static { + // 初始化Uri匹配器 mMatcher = new UriMatcher(UriMatcher.NO_MATCH); + // 匹配笔记集合URI（content://micode_notes/note） mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE); + // 匹配单条笔记URI（content://micode_notes/note/123） mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM); + // 匹配数据集合URI（content://micode_notes/data） mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA); + // 匹配单条数据URI（content://micode_notes/data/456） mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM); + // 匹配搜索URI（content://micode_notes/search） mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH); + // 匹配搜索建议URI（支持带查询参数的路径） mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST); mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST); } /** - * 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. + * 搜索投影定义： + * x'0A'代表SQLite中的换行符'\n'，搜索结果中的标题和内容会去除换行符和空格以显示更多信息。 + * 包含搜索结果所需的字段映射，如ID、搜索建议文本、图标、Intent动作等。 */ 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; + + 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; + // 搜索查询语句：从笔记表中查询符合条件的记录（排除回收站和非笔记类型） 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; + + " FROM " + TABLE.NOTE + + " WHERE " + NoteColumns.SNIPPET + " LIKE ?" + + " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER + + " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE; + /** + * 初始化内容提供器：创建数据库帮助类实例 + * @return 是否初始化成功 + */ @Override public boolean onCreate() { mHelper = NotesDatabaseHelper.getInstance(getContext()); return true; } + /** + * 处理查询请求 + * @param uri 请求的URI + * @param projection 需要查询的列 + * @param selection 查询条件 + * @param selectionArgs 条件参数 + * @param sortOrder 排序规则 + * @return 查询结果Cursor + */ @Override public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, - String sortOrder) { + String sortOrder) { Cursor c = null; SQLiteDatabase db = mHelper.getReadableDatabase(); String id = null; + + // 根据URI匹配结果执行不同的查询逻辑 switch (mMatcher.match(uri)) { case URI_NOTE: - c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null, - sortOrder); + // 查询笔记集合 + c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null, sortOrder); break; case URI_NOTE_ITEM: + // 获取路径中的ID参数 id = uri.getPathSegments().get(1); + // 查询单条笔记（拼接条件：ID=指定值 + 可选条件） c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs, null, null, sortOrder); break; case URI_DATA: - c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null, - sortOrder); + // 查询数据集合 + c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null, sortOrder); break; case URI_DATA_ITEM: + // 获取路径中的ID参数 id = uri.getPathSegments().get(1); + // 查询单条数据（拼接条件：ID=指定值 + 可选条件） c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs, null, null, sortOrder); break; case URI_SEARCH: case URI_SEARCH_SUGGEST: + // 搜索请求不允许指定排序、投影等参数 if (sortOrder != null || projection != null) { throw new IllegalArgumentException( - "do not specify sortOrder, selection, selectionArgs, or projection" + "with this query"); + "搜索查询不允许指定排序、投影、条件参数"); } String searchString = null; + // 解析搜索关键词（从路径或查询参数中获取） if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) { if (uri.getPathSegments().size() > 1) { searchString = uri.getPathSegments().get(1); @@ -131,48 +162,62 @@ public class NotesProvider extends ContentProvider { } try { + // 构造模糊查询条件（前后加%） searchString = String.format("%%%s%%", searchString); - c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY, - new String[] { searchString }); + // 执行原生SQL查询（使用预定义的搜索语句） + c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY, new String[] { searchString }); } catch (IllegalStateException ex) { - Log.e(TAG, "got exception: " + ex.toString()); + Log.e(TAG, "搜索查询异常: " + ex.toString()); } break; default: - throw new IllegalArgumentException("Unknown URI " + uri); + throw new IllegalArgumentException("未知URI: " + uri); } + + // 设置通知URI，以便数据变化时通知观察者 if (c != null) { c.setNotificationUri(getContext().getContentResolver(), uri); } return c; } + /** + * 处理插入请求 + * @param uri 请求的URI + * @param values 要插入的内容值 + * @return 插入后的URI（带自动生成的ID） + */ @Override public Uri insert(Uri uri, ContentValues values) { SQLiteDatabase db = mHelper.getWritableDatabase(); long dataId = 0, noteId = 0, insertedId = 0; + + // 根据URI匹配结果执行不同的插入逻辑 switch (mMatcher.match(uri)) { case URI_NOTE: + // 插入笔记记录，返回自动生成的ID insertedId = noteId = db.insert(TABLE.NOTE, null, values); break; case URI_DATA: + // 插入数据记录，需关联笔记ID（从values中获取） if (values.containsKey(DataColumns.NOTE_ID)) { noteId = values.getAsLong(DataColumns.NOTE_ID); } else { - Log.d(TAG, "Wrong data format without note id:" + values.toString()); + Log.d(TAG, "数据格式错误：缺少笔记ID: " + values.toString()); } insertedId = dataId = db.insert(TABLE.DATA, null, values); break; default: - throw new IllegalArgumentException("Unknown URI " + uri); + throw new IllegalArgumentException("未知URI: " + uri); } - // Notify the note uri + + // 通知笔记数据变化（若插入成功） if (noteId > 0) { getContext().getContentResolver().notifyChange( ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null); } - // Notify the data uri + // 通知数据变化（若插入成功） if (dataId > 0) { getContext().getContentResolver().notifyChange( ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null); @@ -181,45 +226,60 @@ public class NotesProvider extends ContentProvider { return ContentUris.withAppendedId(uri, insertedId); } + /** + * 处理删除请求 + * @param uri 请求的URI + * @param selection 删除条件 + * @param selectionArgs 条件参数 + * @return 删除的记录数 + */ @Override public int delete(Uri uri, String selection, String[] selectionArgs) { int count = 0; String id = null; SQLiteDatabase db = mHelper.getWritableDatabase(); boolean deleteData = false; + + // 根据URI匹配结果执行不同的删除逻辑 switch (mMatcher.match(uri)) { case URI_NOTE: + // 删除笔记集合（排除系统文件夹，ID>0为用户数据） selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 "; count = db.delete(TABLE.NOTE, selection, selectionArgs); break; case URI_NOTE_ITEM: + // 获取路径中的ID参数 id = uri.getPathSegments().get(1); - /** - * ID that smaller than 0 is system folder which is not allowed to - * trash - */ long noteId = Long.valueOf(id); + // 系统文件夹（ID≤0）不允许删除 if (noteId <= 0) { break; } + // 删除单条笔记（拼接条件：ID=指定值 + 可选条件） count = db.delete(TABLE.NOTE, NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs); break; case URI_DATA: + // 删除数据集合 count = db.delete(TABLE.DATA, selection, selectionArgs); deleteData = true; break; case URI_DATA_ITEM: + // 获取路径中的ID参数 id = uri.getPathSegments().get(1); + // 删除单条数据（拼接条件：ID=指定值 + 可选条件） count = db.delete(TABLE.DATA, DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs); deleteData = true; break; default: - throw new IllegalArgumentException("Unknown URI " + uri); + throw new IllegalArgumentException("未知URI: " + uri); } + + // 通知数据变化（若有删除操作） if (count > 0) { if (deleteData) { + // 数据变化可能影响笔记，通知笔记URI getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null); } getContext().getContentResolver().notifyChange(uri, null); @@ -227,39 +287,57 @@ public class NotesProvider extends ContentProvider { return count; } + /** + * 处理更新请求 + * @param uri 请求的URI + * @param values 要更新的内容值 + * @param selection 更新条件 + * @param selectionArgs 条件参数 + * @return 更新的记录数 + */ @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; + + // 根据URI匹配结果执行不同的更新逻辑 switch (mMatcher.match(uri)) { case URI_NOTE: + // 更新笔记集合前，增加版本号（适用于批量更新） increaseNoteVersion(-1, selection, selectionArgs); count = db.update(TABLE.NOTE, values, selection, selectionArgs); break; case URI_NOTE_ITEM: + // 获取路径中的ID参数 id = uri.getPathSegments().get(1); + // 更新单条笔记前，增加版本号 increaseNoteVersion(Long.valueOf(id), selection, selectionArgs); count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs); break; case URI_DATA: + // 更新数据集合 count = db.update(TABLE.DATA, values, selection, selectionArgs); updateData = true; break; case URI_DATA_ITEM: + // 获取路径中的ID参数 id = uri.getPathSegments().get(1); + // 更新单条数据 count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs); updateData = true; break; default: - throw new IllegalArgumentException("Unknown URI " + uri); + throw new IllegalArgumentException("未知URI: " + uri); } + // 通知数据变化（若有更新操作） if (count > 0) { if (updateData) { + // 数据变化可能影响笔记，通知笔记URI getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null); } getContext().getContentResolver().notifyChange(uri, null); @@ -267,18 +345,30 @@ public class NotesProvider extends ContentProvider { return count; } + /** + * 拼接查询条件：在原有条件前添加" AND ("，处理非空条件 + * @param selection 原始条件 + * @return 拼接后的条件字符串 + */ private String parseSelection(String selection) { return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : ""); } + /** + * 增加笔记版本号：用于数据变更时标记版本更新 + * @param id 笔记ID（-1表示批量更新） + * @param selection 更新条件（批量更新时使用） + * @param selectionArgs 条件参数 + */ 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 "); + sql.append("=" + NoteColumns.VERSION + "+1 "); // 版本号自增1 + // 构造更新条件 if (id > 0 || !TextUtils.isEmpty(selection)) { sql.append(" WHERE "); } @@ -287,19 +377,26 @@ public class NotesProvider extends ContentProvider { } if (!TextUtils.isEmpty(selection)) { String selectString = id > 0 ? parseSelection(selection) : selection; + // 替换条件中的占位符?为实际参数 for (String args : selectionArgs) { selectString = selectString.replaceFirst("\\?", args); } sql.append(selectString); } + // 执行SQL更新语句 mHelper.getWritableDatabase().execSQL(sql.toString()); } + /** + * 获取URI对应的MIME类型（未实现） + * @param uri 请求的URI + * @return MIME类型字符串 + */ @Override public String getType(Uri uri) { // TODO Auto-generated method stub return null; } -} +} \ No newline at end of file