From ca7c76df15866b54ba0aad42472b046a07e5e411 Mon Sep 17 00:00:00 2001 From: jacky-qiao <1102127448@qq.com> Date: Tue, 31 Dec 2024 09:59:25 +0800 Subject: [PATCH] =?UTF-8?q?data=E4=B8=AD=E7=9A=846=E4=B8=AA=E4=BB=A3?= =?UTF-8?q?=E7=A0=81=E4=BF=AE=E6=94=B9=E8=BF=81=E7=A7=BB=E5=AE=8C=E6=AF=95?= =?UTF-8?q?--=E6=96=87=E6=B8=A4=E4=B9=94?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../src/net/micode/notes/data/Contact.java | 23 +- .../src/net/micode/notes/data/Notes.java | 226 +++++++------- .../notes/data/NotesDatabaseHelper.java | 289 +++++++++--------- .../net/micode/notes/data/NotesProvider.java | 214 ++++++++----- 4 files changed, 409 insertions(+), 343 deletions(-) diff --git a/Notes-master/src/net/micode/notes/data/Contact.java b/Notes-master/src/net/micode/notes/data/Contact.java index d97ac5d..639e7ec 100644 --- a/Notes-master/src/net/micode/notes/data/Contact.java +++ b/Notes-master/src/net/micode/notes/data/Contact.java @@ -26,9 +26,12 @@ import android.util.Log; import java.util.HashMap; public class Contact { + // 保存联系人名与电话号码映射的缓存 private static HashMap sContactCache; + // 日志标记 private static final String TAG = "Contact"; + // 查询联系人所用的选择条件 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 " @@ -36,36 +39,54 @@ public class Contact { + " FROM phone_lookup" + " WHERE min_match = '+')"; + /** + * 根据电话号码获取联系人的姓名 + * + * @param context 应用的上下文 + * @param phoneNumber 要查询的电话号码 + * @return 联系人的姓名，如果没有找到则返回null + */ public static String getContact(Context context, String phoneNumber) { + // 初始化联系人缓存 if(sContactCache == null) { sContactCache = new HashMap(); } + // 如果缓存中已经存在该电话号码的联系人名，直接返回 if(sContactCache.containsKey(phoneNumber)) { return sContactCache.get(phoneNumber); } + // 替换选择条件中的占位符 String selection = CALLER_ID_SELECTION.replace("+", PhoneNumberUtils.toCallerIDMinMatch(phoneNumber)); + + // 执行查询 Cursor cursor = context.getContentResolver().query( Data.CONTENT_URI, - new String [] { Phone.DISPLAY_NAME }, + new String [] { Phone.DISPLAY_NAME }, // 查询显示名称 selection, new String[] { phoneNumber }, null); + // 如果查询结果不为空且移动到结果集的第一行 if (cursor != null && cursor.moveToFirst()) { try { + // 获取联系人姓名 String name = cursor.getString(0); + // 将联系人姓名缓存起来 sContactCache.put(phoneNumber, name); return name; } catch (IndexOutOfBoundsException e) { + // 捕获索引越界异常，记录错误日志 Log.e(TAG, " Cursor get string error " + e.toString()); return null; } finally { + // 关闭cursor，释放资源 cursor.close(); } } else { + // 如果没有找到匹配的联系人，记录日志 Log.d(TAG, "No contact matched with number:" + phoneNumber); return null; } diff --git a/Notes-master/src/net/micode/notes/data/Notes.java b/Notes-master/src/net/micode/notes/data/Notes.java index f240604..56518a5 100644 --- a/Notes-master/src/net/micode/notes/data/Notes.java +++ b/Notes-master/src/net/micode/notes/data/Notes.java @@ -1,279 +1,283 @@ /* * 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 + * 依据 Apache 许可证第2.0版（“许可证”）授权； + * 您不得在未遵守许可证的情况下使用本文件。 + * 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，依据许可证分发的软件 + * 是按照 "按原样" 基础提供的， + * 不提供任何形式的保证或条件，无论明确或隐含。 + * 请参阅许可证以获取特定语言涉及的权限和限制。 */ package net.micode.notes.data; import android.net.Uri; + public class Notes { + // Notes类的授权标识符 public static final String AUTHORITY = "micode_notes"; + + // 日志标签 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; + + // 笔记类型 + public static final int TYPE_NOTE = 0; // 笔记类型 + public static final int TYPE_FOLDER = 1; // 文件夹类型 + public static final int TYPE_SYSTEM = 2; // 系统类型 /** - * 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 IDs 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 } 是放置无文件夹笔记的临时文件夹 + * {@link Notes#ID_CALL_RECORD_FOLDER} 是存储通话记录的文件夹 */ - public static final int ID_ROOT_FOLDER = 0; - public static final int ID_TEMPARAY_FOLDER = -1; - public static final int ID_CALL_RECORD_FOLDER = -2; - 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 final int ID_ROOT_FOLDER = 0; // 根文件夹 + public static final int ID_TEMPARAY_FOLDER = -1; // 临时文件夹 + public static final int ID_CALL_RECORD_FOLDER = -2; // 通话记录文件夹 + public static final int ID_TRASH_FOLER = -3; // 垃圾箱文件夹 + + // Intent Extra Strings + public static final String INTENT_EXTRA_ALERT_DATE = "net.micode.notes.alert_date"; // 提醒日期 + public static final String INTENT_EXTRA_BACKGROUND_ID = "net.micode.notes.background_color_id"; // 背景颜色ID + public static final String INTENT_EXTRA_WIDGET_ID = "net.micode.notes.widget_id"; // 小部件ID + public static final String INTENT_EXTRA_WIDGET_TYPE = "net.micode.notes.widget_type"; // 小部件类型 + public static final String INTENT_EXTRA_FOLDER_ID = "net.micode.notes.folder_id"; // 文件夹ID + public static final String INTENT_EXTRA_CALL_DATE = "net.micode.notes.call_date"; // 通话日期 + + // 小部件类型 + public static final int TYPE_WIDGET_INVALIDE = -1; // 无效的小部件类型 + public static final int TYPE_WIDGET_2X = 0; // 2x小部件类型 + public static final int TYPE_WIDGET_4X = 1; // 4x小部件类型 public static class DataConstants { - public static final String NOTE = TextNote.CONTENT_ITEM_TYPE; - public static final String CALL_NOTE = CallNote.CONTENT_ITEM_TYPE; + public static final String NOTE = TextNote.CONTENT_ITEM_TYPE; // 笔记内容类型 + public static final String CALL_NOTE = CallNote.CONTENT_ITEM_TYPE; // 通话记录内容类型 } /** - * Uri to query all notes and folders + * 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 + * 查询数据的 URI */ public static final Uri CONTENT_DATA_URI = Uri.parse("content://" + AUTHORITY + "/data"); public interface NoteColumns { /** - * The unique ID for a row - *

Type: INTEGER (long)

+ * 行的独特 ID + *

类型: INTEGER (long)

*/ 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 (long)

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

Type: INTEGER (long)

+ * 创建日期用于笔记或文件夹 + *

类型: INTEGER (long)

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

Type: INTEGER (long)

+ * 最新修改日期 + *

类型: INTEGER (long)

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

Type: INTEGER (long)

+ * 提醒日期 + *

类型: INTEGER (long)

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

Type: TEXT

+ * 文件夹的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 (long)

*/ 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 (long)

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

Type: INTEGER (long)

+ * 笔记的背景颜色的 ID + *

类型: INTEGER (long)

*/ 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 (long)

*/ 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 (long)

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

Type: INTEGER

+ * 标记以指示本地是否已修改 + *

类型: INTEGER

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

Type : INTEGER

+ * 移动到临时文件夹之前的原始父 ID + *

类型 : INTEGER

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

Type : TEXT

+ * gtask ID + *

类型 : TEXT

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

Type : INTEGER (long)

+ * 版本代码 + *

类型 : INTEGER (long)

*/ public static final String VERSION = "version"; } public interface DataColumns { /** - * The unique ID for a row - *

Type: INTEGER (long)

+ * 行的独特 ID + *

类型: INTEGER (long)

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

Type: Text

+ * 此行所表示项目的 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)

+ * 该数据所属笔记的参考 ID + *

类型: INTEGER (long)

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

Type: INTEGER (long)

+ * 创建日期用于笔记或文件夹 + *

类型: INTEGER (long)

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

Type: INTEGER (long)

+ * 最新修改日期 + *

类型: INTEGER (long)

*/ 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，具体含义取决于 {@link #MIMETYPE}，用于 + * 整数数据类型 + *

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，具体含义取决于 {@link #MIMETYPE}，用于 + * 整数数据类型 + *

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，具体含义取决于 {@link #MIMETYPE}，用于 + * TEXT 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，具体含义取决于 {@link #MIMETYPE}，用于 + * TEXT 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，具体含义取决于 {@link #MIMETYPE}，用于 + * TEXT 数据类型 + *

类型: TEXT

*/ public static final String DATA5 = "data5"; } 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

+ * 指示文本处于检查列表模式还是普通模式 + *

类型: Integer 1:检查列表模式 0:普通模式

*/ public static final String MODE = DATA1; - public static final int MODE_CHECK_LIST = 1; + public static final int MODE_CHECK_LIST = 1; // 检查列表模式的常量 - public static final String CONTENT_TYPE = "vnd.android.cursor.dir/text_note"; + public static final String CONTENT_TYPE = "vnd.android.cursor.dir/text_note"; // 笔记内容类型 - public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/text_note"; + public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/text_note"; // 单个笔记项内容类型 - public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/text_note"); + public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/text_note"); // 笔记的内容URI } 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 (long)

*/ 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; - public static final String CONTENT_TYPE = "vnd.android.cursor.dir/call_note"; + public static final String CONTENT_TYPE = "vnd.android.cursor.dir/call_note"; // 通话记录内容类型 - public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/call_note"; + public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/call_note"; // 单个通话记录项内容类型 - public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/call_note"); + public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/call_note"); // 通话记录的内容URI } } diff --git a/Notes-master/src/net/micode/notes/data/NotesDatabaseHelper.java b/Notes-master/src/net/micode/notes/data/NotesDatabaseHelper.java index ffe5d57..6057f34 100644 --- a/Notes-master/src/net/micode/notes/data/NotesDatabaseHelper.java +++ b/Notes-master/src/net/micode/notes/data/NotesDatabaseHelper.java @@ -1,92 +1,99 @@ /* * 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 + * 本文件采用Apache 2.0许可协议进行许可。 + * 未经许可，您不得使用本文件。您可以在以下地址获取许可证： * * 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. + * 除非适用法律另有规定或书面协议另有约定，否则根据许可证分发的软件是按"原样"提供的， + * 不附带任何明示或暗示的担保或条件。有关许可证下的特定语言条款和限制，请参阅许可证。 */ +// 指定包名 package net.micode.notes.data; -import android.content.ContentValues; -import android.content.Context; -import android.database.sqlite.SQLiteDatabase; -import android.database.sqlite.SQLiteOpenHelper; -import android.util.Log; - -import net.micode.notes.data.Notes.DataColumns; -import net.micode.notes.data.Notes.DataConstants; -import net.micode.notes.data.Notes.NoteColumns; +// 导入必要的类 +import android.content.ContentValues; // 用于数据库内容的存储 +import android.content.Context; // 上下文类 +import android.database.sqlite.SQLiteDatabase; // SQLite数据库类 +import android.database.sqlite.SQLiteOpenHelper; // SQLite数据库帮助类 +import android.util.Log; // 日志类 +// 导入自定义数据列和常量 +import net.micode.notes.data.Notes.DataColumns; // 数据列模型 +import net.micode.notes.data.Notes.DataConstants; // 数据常量 +import net.micode.notes.data.Notes.NoteColumns; // 笔记列模型 +// 创建NotesDatabaseHelper类，继承自SQLiteOpenHelper 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; + // 定义表名的接口 public interface TABLE { + // 笔记表的名称 public static final String NOTE = "note"; + // 数据表的名称 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" + + NoteColumns.ID + " INTEGER PRIMARY KEY," + // 笔记ID，主键 + NoteColumns.PARENT_ID + " INTEGER NOT NULL DEFAULT 0," + // 父级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 + NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 创建日期 + NoteColumns.HAS_ATTACHMENT + " INTEGER NOT NULL DEFAULT 0," + // 是否有附件 + NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 修改日期 + NoteColumns.NOTES_COUNT + " INTEGER NOT NULL DEFAULT 0," + // 笔记数量 + NoteColumns.SNIPPET + " TEXT NOT NULL DEFAULT ''," + // 笔记摘要 + NoteColumns.TYPE + " INTEGER NOT NULL DEFAULT 0," + // 笔记类型 + 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," + // 本地修改标志 + NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," + // 原始父级ID + NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''," + // GTASK ID + NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" + // 版本号 ")"; + // 创建数据表的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 ''" + + DataColumns.ID + " INTEGER PRIMARY KEY," + // 数据ID，主键 + DataColumns.MIME_TYPE + " TEXT NOT NULL," + // MIME类型 + DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0," + // 关联的笔记ID + NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 创建日期 + NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 修改日期 + DataColumns.CONTENT + " TEXT NOT NULL DEFAULT ''," + // 内容 + DataColumns.DATA1 + " INTEGER," + // 数据字段1 + DataColumns.DATA2 + " INTEGER," + // 数据字段2 + DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," + // 数据字段3 + DataColumns.DATA4 + " TEXT NOT NULL DEFAULT ''," + // 数据字段4 + DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" + // 数据字段5 ")"; + // 创建数据表中NOTE_ID字段的索引 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 - */ + // 当更新笔记时增加文件夹的笔记计数的触发器 private static final String NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER = - "CREATE TRIGGER increase_folder_count_on_update "+ + "CREATE TRIGGER increase_folder_count_on_update "+ " AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE + " BEGIN " + " UPDATE " + TABLE.NOTE + @@ -94,9 +101,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" + " END"; - /** - * Decrease folder's note count when move note from folder - */ + // 当从文件夹中移动笔记时减少文件夹的笔记计数的触发器 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 + @@ -107,9 +112,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " AND " + NoteColumns.NOTES_COUNT + ">0" + ";" + " END"; - /** - * Increase folder's note count when insert new note to the folder - */ + // 当在文件夹中插入新笔记时增加文件夹的笔记计数的触发器 private static final String NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER = "CREATE TRIGGER increase_folder_count_on_insert " + " AFTER INSERT ON " + TABLE.NOTE + @@ -119,9 +122,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" + " END"; - /** - * Decrease folder's note count when delete note from the folder - */ + // 当从文件夹中删除笔记时减少文件夹的笔记计数的触发器 private static final String NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER = "CREATE TRIGGER decrease_folder_count_on_delete " + " AFTER DELETE ON " + TABLE.NOTE + @@ -132,9 +133,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " AND " + NoteColumns.NOTES_COUNT + ">0;" + " END"; - /** - * Update note's content when insert data with type {@link DataConstants#NOTE} - */ + // 在插入类型为NOTE的数据时更新笔记内容的触发器 private static final String DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER = "CREATE TRIGGER update_note_content_on_insert " + " AFTER INSERT ON " + TABLE.DATA + @@ -145,9 +144,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" + " END"; - /** - * Update note's content when data with {@link DataConstants#NOTE} type has changed - */ + // 当类型为NOTE的数据发生变化时更新笔记内容的触发器 private static final String DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER = "CREATE TRIGGER update_note_content_on_update " + " AFTER UPDATE ON " + TABLE.DATA + @@ -158,9 +155,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" + " END"; - /** - * Update note's content when data with {@link DataConstants#NOTE} type has deleted - */ + // 当类型为NOTE的数据被删除时更新笔记内容的触发器 private static final String DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER = "CREATE TRIGGER update_note_content_on_delete " + " AFTER delete ON " + TABLE.DATA + @@ -171,9 +166,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " WHERE " + NoteColumns.ID + "=old." + DataColumns.NOTE_ID + ";" + " END"; - /** - * Delete datas belong to note which has been deleted - */ + // 删除已删除笔记的所有数据的触发器 private static final String NOTE_DELETE_DATA_ON_DELETE_TRIGGER = "CREATE TRIGGER delete_data_on_delete " + " AFTER DELETE ON " + TABLE.NOTE + @@ -182,9 +175,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " WHERE " + DataColumns.NOTE_ID + "=old." + NoteColumns.ID + ";" + " END"; - /** - * Delete notes belong to folder which has been deleted - */ + // 删除已删除文件夹中的笔记的触发器 private static final String FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER = "CREATE TRIGGER folder_delete_notes_on_delete " + " AFTER DELETE ON " + TABLE.NOTE + @@ -193,9 +184,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" + " END"; - /** - * Move notes belong to folder which has been moved to trash folder - */ + // 当文件夹被移动到垃圾桶时移动文件夹中的笔记的触发器 private static final String FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER = "CREATE TRIGGER folder_move_notes_on_trash " + " AFTER UPDATE ON " + TABLE.NOTE + @@ -206,26 +195,30 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" + " END"; + // 构造函数，接受上下文参数 public NotesDatabaseHelper(Context context) { - super(context, DB_NAME, null, DB_VERSION); + super(context, DB_NAME, null, DB_VERSION); // 调用父类构造函数 } + // 创建笔记表 public void createNoteTable(SQLiteDatabase db) { - db.execSQL(CREATE_NOTE_TABLE_SQL); - reCreateNoteTableTriggers(db); - createSystemFolder(db); - Log.d(TAG, "note table has been created"); + db.execSQL(CREATE_NOTE_TABLE_SQL); // 执行创建表的SQL语句 + reCreateNoteTableTriggers(db); // 重新创建触发器 + createSystemFolder(db); // 创建系统文件夹 + Log.d(TAG, "note table has been created"); // 日志输出 } + // 重新创建笔记表的所有触发器 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"); - db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_delete"); - db.execSQL("DROP TRIGGER IF EXISTS delete_data_on_delete"); - db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_insert"); - db.execSQL("DROP TRIGGER IF EXISTS folder_delete_notes_on_delete"); - db.execSQL("DROP TRIGGER IF EXISTS folder_move_notes_on_trash"); - + db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_update"); // 删除触发器 + db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_update"); // 删除触发器 + db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_delete"); // 删除触发器 + db.execSQL("DROP TRIGGER IF EXISTS delete_data_on_delete"); // 删除触发器 + db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_insert"); // 删除触发器 + db.execSQL("DROP TRIGGER IF EXISTS folder_delete_notes_on_delete"); // 删除触发器 + db.execSQL("DROP TRIGGER IF EXISTS folder_move_notes_on_trash"); // 删除触发器 + + // 创建新的触发器 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); @@ -235,128 +228,130 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER); } + // 创建系统文件夹 private void createSystemFolder(SQLiteDatabase db) { - ContentValues values = new ContentValues(); + ContentValues values = new ContentValues(); // 创建内容值对象 - /** - * call record foler for call notes - */ + // 为通话记录文件夹插入记录 values.put(NoteColumns.ID, Notes.ID_CALL_RECORD_FOLDER); values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); - db.insert(TABLE.NOTE, null, values); + db.insert(TABLE.NOTE, null, values); // 插入记录 - /** - * root folder which is default folder - */ - values.clear(); + // 创建根文件夹 + values.clear(); // 清空内容值 values.put(NoteColumns.ID, Notes.ID_ROOT_FOLDER); values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); - db.insert(TABLE.NOTE, null, values); + db.insert(TABLE.NOTE, null, values); // 插入记录 - /** - * temporary folder which is used for moving note - */ - values.clear(); + // 创建临时文件夹 + values.clear(); // 清空内容值 values.put(NoteColumns.ID, Notes.ID_TEMPARAY_FOLDER); values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); - db.insert(TABLE.NOTE, null, values); + db.insert(TABLE.NOTE, null, values); // 插入记录 - /** - * create trash folder - */ - values.clear(); + // 创建垃圾桶文件夹 + values.clear(); // 清空内容值 values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER); values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); - db.insert(TABLE.NOTE, null, values); + db.insert(TABLE.NOTE, null, values); // 插入记录 } + // 创建数据表 public void createDataTable(SQLiteDatabase db) { - db.execSQL(CREATE_DATA_TABLE_SQL); - reCreateDataTableTriggers(db); - db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL); - Log.d(TAG, "data table has been created"); + db.execSQL(CREATE_DATA_TABLE_SQL); // 执行创建表的SQL语句 + reCreateDataTableTriggers(db); // 重新创建触发器 + db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL); // 创建索引 + Log.d(TAG, "data table has been created"); // 日志输出 } + // 重新创建数据表的所有触发器 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"); - db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_delete"); + db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_insert"); // 删除触发器 + db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_update"); // 删除触发器 + db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_delete"); // 删除触发器 + // 创建新的触发器 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NotesDatabaseHelper的单例实例 static synchronized NotesDatabaseHelper getInstance(Context context) { - if (mInstance == null) { + if (mInstance == null) { // 如果实例为空，则创建新的实例 mInstance = new NotesDatabaseHelper(context); } - return mInstance; + return mInstance; // 返回实例 } + // 当创建数据库时被调用 @Override public void onCreate(SQLiteDatabase db) { - createNoteTable(db); - createDataTable(db); + createNoteTable(db); // 创建笔记表 + createDataTable(db); // 创建数据表 } + // 当升级数据库时被调用 @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { - boolean reCreateTriggers = false; - boolean skipV2 = false; + boolean reCreateTriggers = false; // 重创建触发器的标志 + boolean skipV2 = false; // 跳过V2的标志 - if (oldVersion == 1) { - upgradeToV2(db); - skipV2 = true; // this upgrade including the upgrade from v2 to v3 - oldVersion++; + if (oldVersion == 1) { // 如果旧版本是1 + upgradeToV2(db); // 升级到V2 + skipV2 = true; // 跳过V2的标志设为true + oldVersion++; // 增加版本号 } - if (oldVersion == 2 && !skipV2) { - upgradeToV3(db); - reCreateTriggers = true; - oldVersion++; + if (oldVersion == 2 && !skipV2) { // 如果旧版本是2且没有跳过 + upgradeToV3(db); // 升级到V3 + reCreateTriggers = true; // 设置重创建触发器的标志为true + oldVersion++; // 增加版本号 } - if (oldVersion == 3) { - upgradeToV4(db); - oldVersion++; + if (oldVersion == 3) { // 如果旧版本是3 + upgradeToV4(db); // 升级到V4 + oldVersion++; // 增加版本号 } - if (reCreateTriggers) { - reCreateNoteTableTriggers(db); - reCreateDataTableTriggers(db); + if (reCreateTriggers) { // 如果需要重创建触发器 + reCreateNoteTableTriggers(db); // 重新创建笔记表的触发器 + reCreateDataTableTriggers(db); // 重新创建数据表的触发器 } - if (oldVersion != newVersion) { + if (oldVersion != newVersion) { // 如果版本不一致，则抛出异常 throw new IllegalStateException("Upgrade notes database to version " + newVersion - + "fails"); + + " fails"); } } + // 升级到V2 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); + db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE); // 删除笔记表 + db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA); // 删除数据表 + createNoteTable(db); // 创建笔记表 + createDataTable(db); // 创建数据表 } + // 升级到V3 private void upgradeToV3(SQLiteDatabase db) { - // drop unused triggers + // 删除未使用的触发器 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 + // 为笔记添加一个新的字符ID列 db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''"); - // add a trash system folder + // 添加一个垃圾桶系统文件夹 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); + db.insert(TABLE.NOTE, null, values); // 插入记录 } + // 升级到V4 private void upgradeToV4(SQLiteDatabase db) { db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION - + " INTEGER NOT NULL DEFAULT 0"); + + " INTEGER NOT NULL DEFAULT 0"); // 为笔记表添加版本列 } } diff --git a/Notes-master/src/net/micode/notes/data/NotesProvider.java b/Notes-master/src/net/micode/notes/data/NotesProvider.java index edb0a60..23a981f 100644 --- a/Notes-master/src/net/micode/notes/data/NotesProvider.java +++ b/Notes-master/src/net/micode/notes/data/NotesProvider.java @@ -16,7 +16,7 @@ package net.micode.notes.data; - +// 导入需要的Android和本地类 import android.app.SearchManager; import android.content.ContentProvider; import android.content.ContentUris; @@ -34,271 +34,317 @@ import net.micode.notes.data.Notes.DataColumns; import net.micode.notes.data.Notes.NoteColumns; import net.micode.notes.data.NotesDatabaseHelper.TABLE; - +/** + * NotesProvider 类继承自 ContentProvider， + * 负责与外部交互以进行笔记数据的增删改查操作。 + */ public class NotesProvider extends ContentProvider { + // UriMatcher，用于匹配不同的URI请求 private static final UriMatcher mMatcher; + // 数据库助手实例 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; + // 定义URI常量 + private static final int URI_NOTE = 1; // 笔记 URI + private static final int URI_NOTE_ITEM = 2; // 单个笔记 URI + private static final int URI_DATA = 3; // 数据 URI + private static final int URI_DATA_ITEM = 4; // 单个数据 URI - private static final int URI_SEARCH = 5; - private static final int URI_SEARCH_SUGGEST = 6; + private static final int URI_SEARCH = 5; // 搜索 URI + private static final int URI_SEARCH_SUGGEST = 6; // 搜索建议 URI + // 静态代码块，初始化 URI 匹配器并添加各种 URI 匹配规则 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); + mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE); // 笔记的 URI + mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM); // 单个笔记的 URI + mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA); // 数据的 URI + mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM); // 单个数据的 URI + mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH); // 搜索 URI + mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST); // 搜索建议 URI + mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST); // 带参数的搜索建议 URI } /** - * 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. + * 在搜索结果中，x'0A' 代表换行符。为了更好地展示信息， + * 我们将搜索结果中的标题和内容进行修剪以去除换行符和空格。 */ - 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 final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + "," // 笔记 ID + + NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + "," // 笔记 ID 作为意图额外数据 + + "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_1 + "," // 修剪后的内容作为建议文本1 + + "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_2 + "," // 修剪后的内容作为建议文本2 + + R.drawable.search_result + " AS " + SearchManager.SUGGEST_COLUMN_ICON_1 + "," // 搜索结果图标 + + "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + "," // 意图行为 + + "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA; // 笔记内容类型 + // 搜索笔记的 SQL 查询语句 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 // 查询的表为笔记表 + + " WHERE " + NoteColumns.SNIPPET + " LIKE ?" // 根据内容片段进行模糊匹配 + + " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER // 排除回收站的内容 + + " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE; // 仅匹配笔记类型 @Override public boolean onCreate() { + // 初始化数据库助手 mHelper = NotesDatabaseHelper.getInstance(getContext()); - return true; + return true; // 创建成功 } @Override public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) { + // 查询方法，处理不同的URI请求并返回结果的Cursor Cursor c = null; - SQLiteDatabase db = mHelper.getReadableDatabase(); - String id = null; - switch (mMatcher.match(uri)) { + SQLiteDatabase db = mHelper.getReadableDatabase(); // 获取可读数据库 + String id = null; // 用于存储ID + + switch (mMatcher.match(uri)) { // 根据URI匹配不同的查询类型 case URI_NOTE: - c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null, - sortOrder); + // 查询所有笔记 + c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null, sortOrder); break; case URI_NOTE_ITEM: - id = uri.getPathSegments().get(1); + // 查询单个笔记 + id = uri.getPathSegments().get(1); // 从URI中获取笔记ID 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); + // 查询所有数据 + c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null, sortOrder); break; case URI_DATA_ITEM: - id = uri.getPathSegments().get(1); + // 查询单个数据 + id = uri.getPathSegments().get(1); // 从URI中获取数据ID c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs, null, null, sortOrder); break; case URI_SEARCH: case URI_SEARCH_SUGGEST: if (sortOrder != null || projection != null) { + // 搜索请求不支持排序或选择 throw new IllegalArgumentException( "do not specify sortOrder, selection, selectionArgs, or projection" + "with this query"); } String searchString = null; if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) { + // 获取搜索建议的参数 if (uri.getPathSegments().size() > 1) { searchString = uri.getPathSegments().get(1); } } else { + // 从查询参数获取搜索字符串 searchString = uri.getQueryParameter("pattern"); } if (TextUtils.isEmpty(searchString)) { - return null; + return null; // 如果搜索字符串为空，则返回null } try { + // 使用通配符模糊匹配 searchString = String.format("%%%s%%", searchString); c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY, - new String[] { searchString }); + new String[] { searchString }); // 执行搜索查询 } catch (IllegalStateException ex) { - Log.e(TAG, "got exception: " + ex.toString()); + Log.e(TAG, "got exception: " + ex.toString()); // 记录异常 } break; default: + // 未知的URI，抛出异常 throw new IllegalArgumentException("Unknown URI " + uri); } + if (c != null) { + // 设置通知URI，数据变化时通知的URI c.setNotificationUri(getContext().getContentResolver(), uri); } - return c; + return c; // 返回查询结果 } @Override public Uri insert(Uri uri, ContentValues values) { - SQLiteDatabase db = mHelper.getWritableDatabase(); - long dataId = 0, noteId = 0, insertedId = 0; - switch (mMatcher.match(uri)) { + // 插入数据方法 + SQLiteDatabase db = mHelper.getWritableDatabase(); // 获取可写数据库 + long dataId = 0, noteId = 0, insertedId = 0; // 初始化ID + + switch (mMatcher.match(uri)) { // 根据URI匹配不同的插入类型 case URI_NOTE: + // 插入新的笔记 insertedId = noteId = db.insert(TABLE.NOTE, null, values); break; case URI_DATA: + // 插入新的数据 if (values.containsKey(DataColumns.NOTE_ID)) { + // 获取关联的笔记ID noteId = values.getAsLong(DataColumns.NOTE_ID); } else { - Log.d(TAG, "Wrong data format without note id:" + values.toString()); + Log.d(TAG, "Wrong data format without note id:" + values.toString()); // 记录错误日志 } insertedId = dataId = db.insert(TABLE.DATA, null, values); break; default: + // 未知的URI，抛出异常 throw new IllegalArgumentException("Unknown URI " + uri); } - // Notify the note uri + + // 当笔记插入成功时，通知笔记URI if (noteId > 0) { getContext().getContentResolver().notifyChange( ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null); } - // Notify the data uri + // 当数据插入成功时，通知数据URI if (dataId > 0) { getContext().getContentResolver().notifyChange( ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null); } - return ContentUris.withAppendedId(uri, insertedId); + return ContentUris.withAppendedId(uri, insertedId); // 返回新插入项的URI } @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)) { + // 删除数据方法 + int count = 0; // 计数删除的行数 + String id = null; // 用于存储ID + SQLiteDatabase db = mHelper.getWritableDatabase(); // 获取可写数据库 + boolean deleteData = false; // 标记是否删除数据 + + switch (mMatcher.match(uri)) { // 根据URI匹配不同的删除类型 case URI_NOTE: - selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 "; + // 删除所有笔记 + selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 "; // 除去系统文件夹 count = db.delete(TABLE.NOTE, selection, selectionArgs); break; case URI_NOTE_ITEM: - id = uri.getPathSegments().get(1); - /** - * ID that smaller than 0 is system folder which is not allowed to - * trash - */ + // 删除单个笔记 + id = uri.getPathSegments().get(1); // 从URI中获取笔记ID long noteId = Long.valueOf(id); if (noteId <= 0) { - break; + break; // 系统文件夹不允许删除 } count = db.delete(TABLE.NOTE, NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs); break; case URI_DATA: + // 删除所有数据 count = db.delete(TABLE.DATA, selection, selectionArgs); - deleteData = true; + deleteData = true; // 标记为删除数据 break; case URI_DATA_ITEM: - id = uri.getPathSegments().get(1); + // 删除单个数据 + id = uri.getPathSegments().get(1); // 从URI中获取数据ID count = db.delete(TABLE.DATA, DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs); - deleteData = true; + deleteData = true; // 标记为删除数据 break; default: + // 未知的URI，抛出异常 throw new IllegalArgumentException("Unknown URI " + uri); } + if (count > 0) { if (deleteData) { + // 如果删除了数据，通知笔记URI getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null); } + // 通知数据URI getContext().getContentResolver().notifyChange(uri, null); } - return count; + return count; // 返回删除的行数 } @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; - switch (mMatcher.match(uri)) { + // 更新数据方法 + int count = 0; // 计数更新的行数 + String id = null; // 用于存储ID + SQLiteDatabase db = mHelper.getWritableDatabase(); // 获取可写数据库 + boolean updateData = false; // 标记是否更新数据 + + switch (mMatcher.match(uri)) { // 根据URI匹配不同的更新类型 case URI_NOTE: - increaseNoteVersion(-1, selection, selectionArgs); + // 更新所有笔记 + increaseNoteVersion(-1, selection, selectionArgs); // 更新版本 count = db.update(TABLE.NOTE, values, selection, selectionArgs); break; case URI_NOTE_ITEM: - id = uri.getPathSegments().get(1); - increaseNoteVersion(Long.valueOf(id), selection, selectionArgs); + // 更新单个笔记 + id = uri.getPathSegments().get(1); // 从URI中获取笔记ID + increaseNoteVersion(Long.valueOf(id), selection, selectionArgs); // 更新版本 count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs); break; case URI_DATA: + // 更新所有数据 count = db.update(TABLE.DATA, values, selection, selectionArgs); - updateData = true; + updateData = true; // 标记为更新数据 break; case URI_DATA_ITEM: - id = uri.getPathSegments().get(1); + // 更新单个数据 + id = uri.getPathSegments().get(1); // 从URI中获取数据ID count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs); - updateData = true; + updateData = true; // 标记为更新数据 break; default: + // 未知的URI，抛出异常 throw new IllegalArgumentException("Unknown URI " + uri); } if (count > 0) { if (updateData) { + // 如果更新了数据，通知笔记URI getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null); } + // 通知数据URI getContext().getContentResolver().notifyChange(uri, null); } - return count; + return count; // 返回更新的行数 } + // 辅助方法，用于解析选择条件 private String parseSelection(String selection) { - return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : ""); + return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : ""); // 如果选择条件不为空则添加 AND } + // 辅助方法，用于增加笔记版本 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 "); // 增加版本号 if (id > 0 || !TextUtils.isEmpty(selection)) { - sql.append(" WHERE "); + sql.append(" WHERE "); // 如果有ID或选择条件，添加WHERE } if (id > 0) { - sql.append(NoteColumns.ID + "=" + String.valueOf(id)); + sql.append(NoteColumns.ID + "=" + String.valueOf(id)); // 添加ID条件 } if (!TextUtils.isEmpty(selection)) { + // 处理选择参数 String selectString = id > 0 ? parseSelection(selection) : selection; for (String args : selectionArgs) { - selectString = selectString.replaceFirst("\\?", args); + selectString = selectString.replaceFirst("\\?", args); // 替换占位符 } sql.append(selectString); } - mHelper.getWritableDatabase().execSQL(sql.toString()); + mHelper.getWritableDatabase().execSQL(sql.toString()); // 执行SQL更新版本号 } @Override public String getType(Uri uri) { - // TODO Auto-generated method stub + // 返回特定URI的MIME类型，这里暂时不实现 return null; }