From c036dff5ba22c3ceeccff6171b83feb7ca0666bf Mon Sep 17 00:00:00 2001 From: unknown <2420938740@qq.com> Date: Mon, 16 Jun 2025 15:23:29 +0800 Subject: [PATCH] =?UTF-8?q?=E5=86=8D=E6=AC=A1=E6=8F=90=E4=BA=A4=E4=BB=A3?= =?UTF-8?q?=E7=A0=81=E6=B3=A8=E9=87=8A?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../java/net/micode/notes/data/Contact.java | 25 +++ .../java/net/micode/notes/data/Notes.java | 174 +++++++++++------- .../notes/data/NotesDatabaseHelper.java | 65 +++++-- .../net/micode/notes/data/NotesProvider.java | 93 +++++++++- 4 files changed, 263 insertions(+), 94 deletions(-) diff --git a/app/src/main/java/net/micode/notes/data/Contact.java b/app/src/main/java/net/micode/notes/data/Contact.java index d97ac5d..2e2c098 100644 --- a/app/src/main/java/net/micode/notes/data/Contact.java +++ b/app/src/main/java/net/micode/notes/data/Contact.java @@ -25,10 +25,19 @@ import android.util.Log; import java.util.HashMap; +/** + * 联系人类 + * 用于根据电话号码查询联系人信息 + */ public class Contact { + // 联系人缓存，用于存储已查询过的电话号码和对应联系人名称 private static HashMap sContactCache; + // 日志标签 private static final String TAG = "Contact"; + // SQL查询语句，用于根据电话号码查询联系人 + // PHONE_NUMBERS_EQUAL函数用于比较电话号码 + // 查询条件包括匹配电话号码、数据类型为电话类型、以及raw_contact_id在phone_lookup表中 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 " @@ -36,17 +45,27 @@ public class Contact { + " FROM phone_lookup" + " WHERE min_match = '+')"; + /** + * 根据电话号码获取联系人名称 + * @param context 上下文对象 + * @param phoneNumber 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，初始化缓存 if(sContactCache == null) { sContactCache = new HashMap(); } + // 检查缓存中是否已存在该电话号码对应的联系人 if(sContactCache.containsKey(phoneNumber)) { return sContactCache.get(phoneNumber); } + // 替换查询语句中的占位符，使用PhoneNumberUtils.toCallerIDMinMatch生成匹配字符串 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 }, @@ -54,18 +73,24 @@ public class Contact { new String[] { phoneNumber }, null); + // 处理查询结果 if (cursor != null && cursor.moveToFirst()) { try { + // 获取联系人名称 String name = cursor.getString(0); + // 将结果存入缓存 sContactCache.put(phoneNumber, name); return name; } catch (IndexOutOfBoundsException e) { + // 记录错误日志 Log.e(TAG, " Cursor get string error " + e.toString()); return null; } finally { + // 关闭游标 cursor.close(); } } else { + // 未找到匹配的联系人，记录调试日志 Log.d(TAG, "No contact matched with number:" + phoneNumber); return null; } diff --git a/app/src/main/java/net/micode/notes/data/Notes.java b/app/src/main/java/net/micode/notes/data/Notes.java index f240604..943e635 100644 --- a/app/src/main/java/net/micode/notes/data/Notes.java +++ b/app/src/main/java/net/micode/notes/data/Notes.java @@ -17,234 +17,268 @@ package net.micode.notes.data; import android.net.Uri; + +/** + * 笔记应用的数据常量定义类 + * 包含URI、列名、类型标识等常量 + */ public class Notes { + // 内容提供者的授权名称 public static final String AUTHORITY = "micode_notes"; + // 日志标签 public static final String TAG = "Notes"; + // 笔记类型：普通笔记 public static final int TYPE_NOTE = 0; + // 笔记类型：文件夹 public static final int TYPE_FOLDER = 1; + // 笔记类型：系统文件夹 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 + * {@link Notes#ID_TRASH_FOLER} 用于存储已删除的笔记（回收站） */ 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; + // Intent传递数据的键名常量 + // 提醒日期 public static final String INTENT_EXTRA_ALERT_DATE = "net.micode.notes.alert_date"; + // 背景颜色ID public static final String INTENT_EXTRA_BACKGROUND_ID = "net.micode.notes.background_color_id"; + // 小部件ID public static final String INTENT_EXTRA_WIDGET_ID = "net.micode.notes.widget_id"; + // 小部件类型 public static final String INTENT_EXTRA_WIDGET_TYPE = "net.micode.notes.widget_type"; + // 文件夹ID public static final String INTENT_EXTRA_FOLDER_ID = "net.micode.notes.folder_id"; + // 通话日期 public static final String INTENT_EXTRA_CALL_DATE = "net.micode.notes.call_date"; + // 小部件类型常量 + // 无效的小部件类型 public static final int TYPE_WIDGET_INVALIDE = -1; + // 2x小部件类型 public static final int TYPE_WIDGET_2X = 0; + // 4x小部件类型 public static final int TYPE_WIDGET_4X = 1; + /** + * 数据常量类 + * 定义不同类型笔记的内容类型 + */ public static class DataConstants { + // 文本笔记的内容类型 public static final String NOTE = TextNote.CONTENT_ITEM_TYPE; + // 通话笔记的内容类型 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"); + /** + * 笔记表的列名接口 + * 定义了笔记表中各列的名称和数据类型 + */ public interface NoteColumns { /** - * The unique ID for a row - *

Type: INTEGER (long)

+ * 行的唯一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)

+ * 笔记或文件夹的创建日期 + *

类型: INTEGER (long)

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

Type: INTEGER (long)

+ * 最近修改日期 + *

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

+ * 文件夹名称或笔记的文本内容摘要 + *

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

+ * 移入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 (long)

*/ public static final String VERSION = "version"; } + /** + * 数据表的列名接口 + * 定义了数据表中各列的名称和数据类型 + */ public interface DataColumns { /** - * The unique ID for a row - *

Type: INTEGER (long)

+ * 行的唯一ID + *

类型: INTEGER (long)

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

Type: Text

+ * 该行表示的项目的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)

+ * 该数据所属笔记的引用ID + *

类型: INTEGER (long)

*/ 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 (long)

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

Type: INTEGER (long)

+ * 最近修改日期 + *

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，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，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，含义取决于{@link #MIMETYPE}，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，含义取决于{@link #MIMETYPE}，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，含义取决于{@link #MIMETYPE}，用于文本数据类型 + *

类型: TEXT

*/ public static final String DATA5 = "data5"; } + /** + * 文本笔记类 + * 实现DataColumns接口，定义文本笔记的特定常量 + */ 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，表示文本是否处于检查列表模式 + *

类型: Integer 1:检查列表模式 0:普通模式

*/ public static final String MODE = DATA1; diff --git a/app/src/main/java/net/micode/notes/data/NotesDatabaseHelper.java b/app/src/main/java/net/micode/notes/data/NotesDatabaseHelper.java index ffe5d57..4020609 100644 --- a/app/src/main/java/net/micode/notes/data/NotesDatabaseHelper.java +++ b/app/src/main/java/net/micode/notes/data/NotesDatabaseHelper.java @@ -26,22 +26,35 @@ import net.micode.notes.data.Notes.DataColumns; import net.micode.notes.data.Notes.DataConstants; import net.micode.notes.data.Notes.NoteColumns; - +/** + * 笔记应用的数据库帮助类 + * 负责创建、升级数据库及其表结构 + * 管理数据库触发器 + */ 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; + /** + * 表名常量接口 + */ public interface TABLE { + // 笔记表 public static final String NOTE = "note"; - + // 数据表 public static final String DATA = "data"; } + // 日志标签 private static final String TAG = "NotesDatabaseHelper"; + // 单例实例 private static NotesDatabaseHelper mInstance; + // 创建笔记表的SQL语句 private static final String CREATE_NOTE_TABLE_SQL = "CREATE TABLE " + TABLE.NOTE + "(" + NoteColumns.ID + " INTEGER PRIMARY KEY," + @@ -63,6 +76,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" + ")"; + // 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," + @@ -78,12 +92,13 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" + ")"; + // 创建数据表的笔记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 + ");"; /** - * Increase folder's note count when move note to the folder + * 触发器：当笔记移动到文件夹时，增加文件夹的笔记计数 */ private static final String NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER = "CREATE TRIGGER increase_folder_count_on_update "+ @@ -95,7 +110,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " END"; /** - * Decrease folder's note count when move note from folder + * 触发器：当笔记从文件夹移出时，减少文件夹的笔记计数 */ private static final String NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER = "CREATE TRIGGER decrease_folder_count_on_update " + @@ -108,7 +123,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " END"; /** - * Increase folder's note count when insert new note to the folder + * 触发器：当向文件夹插入新笔记时，增加文件夹的笔记计数 */ private static final String NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER = "CREATE TRIGGER increase_folder_count_on_insert " + @@ -120,7 +135,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " END"; /** - * Decrease folder's note count when delete note from the folder + * 触发器：当从文件夹删除笔记时，减少文件夹的笔记计数 */ private static final String NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER = "CREATE TRIGGER decrease_folder_count_on_delete " + @@ -133,7 +148,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " END"; /** - * Update note's content when insert data with type {@link DataConstants#NOTE} + * 触发器：当插入类型为{@link DataConstants#NOTE}的数据时，更新笔记的内容 */ private static final String DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER = "CREATE TRIGGER update_note_content_on_insert " + @@ -146,7 +161,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " END"; /** - * Update note's content when data with {@link DataConstants#NOTE} type has changed + * 触发器：当类型为{@link DataConstants#NOTE}的数据更新时，更新笔记的内容 */ private static final String DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER = "CREATE TRIGGER update_note_content_on_update " + @@ -159,7 +174,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " END"; /** - * Update note's content when data with {@link DataConstants#NOTE} type has deleted + * 触发器：当类型为{@link DataConstants#NOTE}的数据被删除时，更新笔记的内容为空 */ private static final String DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER = "CREATE TRIGGER update_note_content_on_delete " + @@ -172,7 +187,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " END"; /** - * Delete datas belong to note which has been deleted + * 触发器：当笔记被删除时，删除属于该笔记的所有数据 */ private static final String NOTE_DELETE_DATA_ON_DELETE_TRIGGER = "CREATE TRIGGER delete_data_on_delete " + @@ -183,7 +198,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " END"; /** - * Delete notes belong to folder which has been deleted + * 触发器：当文件夹被删除时，删除属于该文件夹的所有笔记 */ private static final String FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER = "CREATE TRIGGER folder_delete_notes_on_delete " + @@ -194,7 +209,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " 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，将属于该文件夹的所有笔记也移动到回收站 */ private static final String FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER = "CREATE TRIGGER folder_move_notes_on_trash " + @@ -206,10 +221,18 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" + " END"; + /** + * 构造函数 + * @param context 上下文对象 + */ public NotesDatabaseHelper(Context context) { super(context, DB_NAME, null, DB_VERSION); } + /** + * 创建笔记表 + * @param db 数据库对象 + */ public void createNoteTable(SQLiteDatabase db) { db.execSQL(CREATE_NOTE_TABLE_SQL); reCreateNoteTableTriggers(db); @@ -217,7 +240,12 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { Log.d(TAG, "note table has been created"); } + /** + * 重新创建笔记表的触发器 + * @param db 数据库对象 + */ private void reCreateNoteTableTriggers(SQLiteDatabase db) { + // 删除已存在的触发器 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 +254,7 @@ 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); @@ -235,18 +264,22 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER); } + /** + * 创建系统文件夹 + * @param db 数据库对象 + */ 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 */ 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，即默认文件夹 */ values.clear(); values.put(NoteColumns.ID, Notes.ID_ROOT_FOLDER); @@ -254,7 +287,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { db.insert(TABLE.NOTE, null, values); /** - * temporary folder which is used for moving note + * 临时文件夹，用于移动笔记 */ values.clear(); values.put(NoteColumns.ID, Notes.ID_TEMPARAY_FOLDER); @@ -262,7 +295,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { 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); diff --git a/app/src/main/java/net/micode/notes/data/NotesProvider.java b/app/src/main/java/net/micode/notes/data/NotesProvider.java index edb0a60..3ecd23c 100644 --- a/app/src/main/java/net/micode/notes/data/NotesProvider.java +++ b/app/src/main/java/net/micode/notes/data/NotesProvider.java @@ -34,22 +34,36 @@ import net.micode.notes.data.Notes.DataColumns; import net.micode.notes.data.Notes.NoteColumns; import net.micode.notes.data.NotesDatabaseHelper.TABLE; - +/** + * 笔记应用的内容提供者 + * 负责处理对笔记数据的CRUD操作 + * 实现搜索功能 + */ public class NotesProvider extends ContentProvider { + // URI匹配器，用于匹配请求的URI private static final UriMatcher mMatcher; + // 数据库帮助类实例 private NotesDatabaseHelper mHelper; + // 日志标签 private static final String TAG = "NotesProvider"; + // URI类型常量 + // 笔记表 private static final int URI_NOTE = 1; + // 单个笔记项 private static final int URI_NOTE_ITEM = 2; + // 数据表 private static final int URI_DATA = 3; + // 单个数据项 private static final int URI_DATA_ITEM = 4; - + // 搜索 private static final int URI_SEARCH = 5; + // 搜索建议 private static final int URI_SEARCH_SUGGEST = 6; + // 静态初始化块，设置URI匹配规则 static { mMatcher = new UriMatcher(UriMatcher.NO_MATCH); mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE); @@ -62,8 +76,8 @@ public class NotesProvider extends ContentProvider { } /** - * 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. + * x'0A'在sqlite中表示'\n'字符。对于搜索结果中的标题和内容， + * 我们将修剪'\n'和空格，以便显示更多信息。 */ private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + "," + NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + "," @@ -73,18 +87,32 @@ public class NotesProvider extends ContentProvider { + "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + "," + "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA; + // 笔记内容搜索查询SQL 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; + /** + * 内容提供者创建时调用 + * 初始化数据库帮助类 + */ @Override public boolean onCreate() { mHelper = NotesDatabaseHelper.getInstance(getContext()); return true; } + /** + * 处理查询请求 + * @param uri 请求的URI + * @param projection 要返回的列 + * @param selection 查询条件 + * @param selectionArgs 查询条件参数 + * @param sortOrder 排序方式 + * @return 查询结果游标 + */ @Override public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) { @@ -93,25 +121,30 @@ public class NotesProvider extends ContentProvider { String id = null; switch (mMatcher.match(uri)) { case URI_NOTE: + // 查询笔记表 c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null, sortOrder); break; case URI_NOTE_ITEM: + // 查询单个笔记 id = uri.getPathSegments().get(1); c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs, null, null, sortOrder); break; case URI_DATA: + // 查询数据表 c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null, sortOrder); break; case URI_DATA_ITEM: + // 查询单个数据项 id = uri.getPathSegments().get(1); c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs, null, null, sortOrder); break; case URI_SEARCH: case URI_SEARCH_SUGGEST: + // 处理搜索和搜索建议 if (sortOrder != null || projection != null) { throw new IllegalArgumentException( "do not specify sortOrder, selection, selectionArgs, or projection" + "with this query"); @@ -131,6 +164,7 @@ public class NotesProvider extends ContentProvider { } try { + // 构建模糊查询参数 searchString = String.format("%%%s%%", searchString); c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY, new String[] { searchString }); @@ -142,20 +176,29 @@ public class NotesProvider extends ContentProvider { throw new IllegalArgumentException("Unknown URI " + uri); } if (c != null) { + // 设置通知URI，当数据变化时通知观察者 c.setNotificationUri(getContext().getContentResolver(), uri); } return c; } + /** + * 处理插入请求 + * @param uri 请求的URI + * @param values 要插入的值 + * @return 插入后的URI + */ @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: + // 插入笔记 insertedId = noteId = db.insert(TABLE.NOTE, null, values); break; case URI_DATA: + // 插入数据 if (values.containsKey(DataColumns.NOTE_ID)) { noteId = values.getAsLong(DataColumns.NOTE_ID); } else { @@ -166,13 +209,13 @@ public class NotesProvider extends ContentProvider { default: throw new IllegalArgumentException("Unknown URI " + uri); } - // Notify the note uri + // 通知笔记URI的观察者 if (noteId > 0) { getContext().getContentResolver().notifyChange( ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null); } - // Notify the data uri + // 通知数据URI的观察者 if (dataId > 0) { getContext().getContentResolver().notifyChange( ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null); @@ -181,6 +224,13 @@ 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 删除条件参数 + * @return 删除的行数 + */ @Override public int delete(Uri uri, String selection, String[] selectionArgs) { int count = 0; @@ -189,14 +239,15 @@ public class NotesProvider extends ContentProvider { boolean deleteData = false; switch (mMatcher.match(uri)) { case URI_NOTE: + // 删除笔记，确保ID大于0（系统文件夹ID小于等于0） selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 "; count = db.delete(TABLE.NOTE, selection, selectionArgs); break; case URI_NOTE_ITEM: + // 删除单个笔记 id = uri.getPathSegments().get(1); /** - * ID that smaller than 0 is system folder which is not allowed to - * trash + * ID小于0的是系统文件夹，不允许删除 */ long noteId = Long.valueOf(id); if (noteId <= 0) { @@ -206,10 +257,12 @@ public class NotesProvider extends ContentProvider { NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs); break; case URI_DATA: + // 删除数据 count = db.delete(TABLE.DATA, selection, selectionArgs); deleteData = true; break; case URI_DATA_ITEM: + // 删除单个数据项 id = uri.getPathSegments().get(1); count = db.delete(TABLE.DATA, DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs); @@ -219,14 +272,24 @@ public class NotesProvider extends ContentProvider { throw new IllegalArgumentException("Unknown URI " + uri); } if (count > 0) { + // 如果删除了数据，通知笔记URI的观察者 if (deleteData) { getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null); } + // 通知当前URI的观察者 getContext().getContentResolver().notifyChange(uri, null); } return count; } + /** + * 处理更新请求 + * @param uri 请求的URI + * @param values 要更新的值 + * @param selection 更新条件 + * @param selectionArgs 更新条件参数 + * @return 更新的行数 + */ @Override public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) { int count = 0; @@ -235,16 +298,19 @@ public class NotesProvider extends ContentProvider { boolean updateData = false; switch (mMatcher.match(uri)) { case URI_NOTE: + // 更新笔记，增加版本号 increaseNoteVersion(-1, selection, selectionArgs); count = db.update(TABLE.NOTE, values, selection, selectionArgs); break; case URI_NOTE_ITEM: + // 更新单个笔记，增加版本号 id = uri.getPathSegments().get(1); 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 count = db.update(TABLE.DATA, values, selection, selectionArgs); updateData = true; break; @@ -267,10 +333,18 @@ public class NotesProvider extends ContentProvider { return count; } + /** + * 解析选择条件 + * 如果selection不为空，则添加AND前缀 + */ private String parseSelection(String selection) { return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : ""); } + /** + * 增加笔记版本号 + * 当笔记被更新时调用 + */ private void increaseNoteVersion(long id, String selection, String[] selectionArgs) { StringBuilder sql = new StringBuilder(120); sql.append("UPDATE "); @@ -296,6 +370,9 @@ public class NotesProvider extends ContentProvider { mHelper.getWritableDatabase().execSQL(sql.toString()); } + /** + * 获取URI对应的MIME类型 + */ @Override public String getType(Uri uri) { // TODO Auto-generated method stub