报告

Signed-off-by: Qzy <2265492292@qq.com>

.editorconfig

@@ -0,0 +1,12 @@
+# EditorConfig is awesome: https://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = crlf
+charset = utf-8
+trim_trailing_whitespace = false
+insert_final_newline = false

src/.editorconfig

@@ -0,0 +1,12 @@
+# EditorConfig is awesome: https://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = crlf
+charset = utf-8
+trim_trailing_whitespace = false
+insert_final_newline = false

src/app/src/main/AndroidManifest.xml

@@ -1,17 +1,20 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?> <!--声明xml文档版本和编码格式-->
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools">
+    xmlns:tools="http://schemas.android.com/tools"
-
+    tools:ignore="WrongManifestParent"> <!--根元素，定义应用程序的基本信息和权限-->
-    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+
-    <uses-permission android:name="com.android.launcher.permission.INSTALL_SHORTCUT" />
+    <!--权限声明-->
-    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /><!--允许写入外部存储 -->
-    <uses-permission android:name="android.permission.READ_CONTACTS" />
+    <uses-permission android:name="com.android.launcher.permission.INSTALL_SHORTCUT" /><!--允许安装快捷方式 -->
-    <uses-permission android:name="android.permission.MANAGE_ACCOUNTS" />
+    <uses-permission android:name="android.permission.INTERNET" /><!--允许访问互联网-->
-    <uses-permission android:name="android.permission.AUTHENTICATE_ACCOUNTS" />
+    <uses-permission android:name="android.permission.READ_CONTACTS" /><!--允许读取联系人信息-->
-    <uses-permission android:name="android.permission.GET_ACCOUNTS" />
+    <uses-permission android:name="android.permission.MANAGE_ACCOUNTS" /><!--允许管理账户-->
-    <uses-permission android:name="android.permission.USE_CREDENTIALS" />
+    <uses-permission android:name="android.permission.AUTHENTICATE_ACCOUNTS" /><!--允许验证账户-->
-    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
+    <uses-permission android:name="android.permission.GET_ACCOUNTS" /><!--允许获取账户信息-->
-
+    <uses-permission android:name="android.permission.USE_CREDENTIALS" /><!--允许使用凭据的-->
+    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" /><!--允许接收开机完成的广播-->
+
+    <!--应用程序标签,定义应用程序的属性-->
     <application
         android:allowBackup="true"
         android:dataExtractionRules="@xml/data_extraction_rules"
@@ -22,7 +25,17 @@
         android:supportsRtl="true"
         android:theme="@style/NoteTheme"
         tools:targetApi="31">
-
+    <!--允许应用程序数据备份 
+    数据提取规则 
+    完整备份内容 
+    应用图标 
+    应用名称
+    圆形图标
+    支持从右到左的布局
+    应用主题
+    目标 API 级别-->
+        <!--活动标签,定义应用中的活动
+        主活动，显示笔记列表 -->
         <activity
             android:name=".ui.NotesListActivity"
             android:configChanges="keyboardHidden|orientation|screenSize"
@@ -32,113 +45,170 @@
             android:uiOptions="splitActionBarWhenNarrow" 
             android:windowSoftInputMode="adjustPan"
             android:exported="true">
-
+            <!--主活动的类名 
-        <intent-filter>
+            配置变化时的处理 
-                <action android:name="android.intent.action.MAIN" />
+            活动标签 
-                <category android:name="android.intent.category.LAUNCHER" />
+            启动模式 
+            活动主题
+            窄屏幕时的 UI 选项 
+            软键盘弹出时的调整方式 
+            允许其他应用启动此活动 -->
+
+        <!--意图过滤器-->
+        <intent-filter><!--定义活动可以响应的意图-->
+                <action android:name="android.intent.action.MAIN" /><!-- 主入口 -->
+                <category android:name="android.intent.category.LAUNCHER" /><!-- 启动器类别 -->
             </intent-filter>
         </activity>
 
+         <!-- 编辑笔记的活动 -->
         <activity
             android:name=".ui.NoteEditActivity"
             android:configChanges="keyboardHidden|orientation|screenSize"
             android:exported="true"
             android:launchMode="singleTop" 
             android:theme="@style/NoteTheme">
+            <!-- 编辑活动的类名 -->
+            <!-- 配置变化时的处理 -->
+            <!-- 允许其他应用启动此活动 -->
+            <!-- 启动模式 -->
+            <!-- 活动主题 -->
+
 
-            <intent-filter>
-                <action android:name="android.intent.action.VIEW" />
-                <category android:name="android.intent.category.DEFAULT" />
 
-                <data android:mimeType="vnd.android.cursor.item/text_note" />
+             <!-- 意图过滤器，定义此活动可以响应的意图 -->
-                <data android:mimeType="vnd.android.cursor.item/call_note" />
+            <intent-filter android:scheme="http"
+                tools:ignore="AppLinkUrlError">
+                <action android:name="android.intent.action.VIEW" /><!-- 查看笔记 -->
+                <category android:name="android.intent.category.DEFAULT" /><!-- 默认类别 -->
+
+                <data android:mimeType="vnd.android.cursor.item/text_note" /> <!-- 支持的 MIME 类型 -->
+                <data android:mimeType="vnd.android.cursor.item/call_note" /><!-- 支持的 MIME 类型 -->
             </intent-filter>
 
             <intent-filter>
-                <action android:name="android.intent.action.INSERT_OR_EDIT" />
+                <action android:name="android.intent.action.INSERT_OR_EDIT" /><!-- 插入或编辑笔记 -->
-                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.DEFAULT" /><!-- 默认类别 -->
-
+                <data android:mimeType="vnd.android.cursor.item/text_note" /> <!-- 支持的 MIME 类型 -->
-                <data android:mimeType="vnd.android.cursor.item/text_note" />
+                <data android:mimeType="vnd.android.cursor.item/call_note" /> <!-- 支持的 MIME 类型 -->
-                <data android:mimeType="vnd.android.cursor.item/call_note" />
             </intent-filter>
 
             <intent-filter>
-                <action android:name="android.intent.action.SEARCH" />
+                <action android:name="android.intent.action.SEARCH" /><!-- 搜索笔记 -->
-                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.DEFAULT" /> <!-- 默认类别 -->
             </intent-filter>
 
+            <!-- 元数据，定义可搜索的活动 -->
             <meta-data
                 android:name="android.app.searchable"
-                android:resource="@xml/searchable" />
+                android:resource="@xml/searchable" /><!-- 搜索配置 -->
         </activity>
 
-
+        <!-- 内容提供者，管理笔记数据 -->
         <provider
             android:name="net.micode.notes.data.NotesProvider"
             android:authorities="micode_notes"
             android:multiprocess="true" />
+            <!-- 内容提供者的类名 -->
+            <!-- 唯一标识内容提供者的权限 -->
+            <!-- 允许多进程访问 -->
 
+        <!--小部件提供者，处理小部件的更新和删除-->
         <receiver
             android:name=".widget.NoteWidgetProvider_2x" 
             android:exported="true" 
             android:label="@string/app_widget2x2"> 
+            <!-- 2x2 小部件提供者的类名 -->
+            <!-- 允许其他应用启动此接收器 -->
+            <!-- 小部件标签 -->
+
             <intent-filter>
-                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
+                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" /><!-- 小部件更新 -->
-                <action android:name="android.appwidget.action.APPWIDGET_DELETED" />
+                <action android:name="android.appwidget.action.APPWIDGET_DELETED" /> <!-- 小部件删除 -->
-                <action android:name="android.intent.action.PRIVACY_MODE_CHANGED" />
+                <action android:name="android.intent.action.PRIVACY_MODE_CHANGED" /> <!-- 隐私模式变化 -->
             </intent-filter>
 
+             <!-- 元数据，定义小部件的配置信息 -->
             <meta-data
                 android:name="android.appwidget.provider"
-                android:resource="@xml/widget_2x_info" />
+                android:resource="@xml/widget_2x_info" /><!-- 小部件配置 -->
         </receiver>
+
+        <!-- 4x4 小部件提供者 -->
         <receiver
             android:name=".widget.NoteWidgetProvider_4x"
             android:exported="true" 
             android:label="@string/app_widget4x4"> 
+            <!-- 4x4 小部件提供者的类名 -->
+            <!-- 允许其他应用启动此接收器 -->
+            <!-- 小部件标签 -->
+
 
             <intent-filter>
-                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
+                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" /><!-- 小部件更新 -->
-                <action android:name="android.appwidget.action.APPWIDGET_DELETED" />
+                <action android:name="android.appwidget.action.APPWIDGET_DELETED" /> <!-- 小部件删除 -->
-                <action android:name="android.intent.action.PRIVACY_MODE_CHANGED" />
+                <action android:name="android.intent.action.PRIVACY_MODE_CHANGED" /> <!-- 隐私模式变化 -->
             </intent-filter>
-
+             <!-- 元数据，定义小部件的配置信息 -->
             <meta-data
                 android:name="android.appwidget.provider"
-                android:resource="@xml/widget_4x_info" />
+                android:resource="@xml/widget_4x_info" /><!-- 小部件配置 -->
         </receiver>
 
+        <!-- 开机完成接收器，初始化闹钟 -->
         <receiver
             android:name=".ui.AlarmInitReceiver"
             android:exported="true">
+            <!-- 闹钟初始化接收器的类名 -->
+            <!-- 允许其他应用启动此接收器 -->
+
+
             <intent-filter>
-                <action android:name="android.intent.action.BOOT_COMPLETED" />
+                <action android:name="android.intent.action.BOOT_COMPLETED" /><!-- 开机完成 -->
             </intent-filter>
         </receiver>
 
+        <!-- 闹钟接收器，处理闹钟事件 -->
         <receiver
             android:name="net.micode.notes.ui.AlarmReceiver"
             android:process=":remote"></receiver>
+            <!-- 闹钟接收器的类名 -->
+            <!-- 在远程进程中运行 -->
 
+        <!-- 闹钟提醒活动 -->
         <activity
             android:name=".ui.AlarmAlertActivity"
             android:label="@string/app_name" 
             android:launchMode="singleInstance" 
-            android:theme="@android:style/Theme.Holo.Wallpaper.NoTitleBar"></activity>
+            android:theme="@android:style/Theme.Holo.Wallpaper.NoTitleBar">
+        </activity>
+        <!-- 闹钟提醒活动的类名 -->
+        <!-- 活动标签 -->
+        <!-- 启动模式 -->
+        <!-- 活动主题 -->
 
+        <!-- 设置活动 -->
         <activity
             android:name="net.micode.notes.ui.NotesPreferenceActivity"
             android:label="@string/preferences_title" 
             android:launchMode="singleTop" 
-            android:theme="@android:style/Theme.Holo.Light"></activity>
+            android:theme="@android:style/Theme.Holo.Light" /> 
+            <!-- 设置活动的类名 -->
+            <!-- 活动标签 -->
+            <!-- 启动模式 -->
+            <!-- 活动主题 -->
 
+        <!-- 同步服务 -->
         <service
             android:name="net.micode.notes.gtask.remote.GTaskSyncService"
             android:exported="false"></service>
+            <!-- 同步服务的类名 -->
+            <!-- 允许其他应用启动此服务 -->
 
+        <!-- 默认可搜索活动 -->
         <meta-data
             android:name="android.app.default_searchable"
-            android:value=".ui.NoteEditActivity" />
+            android:value=".ui.NoteEditActivity" /><!-- 默认可搜索的活动 -->
 
         <!--        <activity-->
         <!--            android:name=".MainActivity"-->

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

@@ -26,47 +26,72 @@ import android.util.Log;
 import java.util.HashMap;
 
 public class Contact {
+    // 用于日志记录的标签，方便调试和错误追踪
     private static final String TAG = "Contact";
+
+    // SQL 查询条件，用于查找与给定电话号码匹配的联系人
     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 "
         + "(SELECT raw_contact_id "
         + " FROM phone_lookup"
         + " WHERE min_match = '+')";
+
+    // 用于缓存联系人名称的 HashMap，避免重复查询
     private static HashMap<String, String> sContactCache;
 
+    /**
+     * 根据电话号码获取联系人名称
+     *
+     * @param context     应用的上下文，用于访问内容解析器
+     * @param phoneNumber 要查询的电话号码，格式可以是国际格式或本地格式
+     * @return 返回联系人名称，如果未找到匹配的联系人则返回 null
+     */
     public static String getContact(Context context, String phoneNumber) {
+        // 初始化缓存，如果缓存尚未创建
         if (sContactCache == null) {
             sContactCache = new HashMap<String, String>();
         }
 
+        // 检查缓存中是否已有该电话号码的联系人名称
         if (sContactCache.containsKey(phoneNumber)) {
+            // 如果缓存中存在，直接返回联系人名称
             return sContactCache.get(phoneNumber);
         }
 
+        // 使用 PhoneNumberUtils 将电话号码转换为最小匹配格式，并替换选择条件中的 "+"
         String selection = CALLER_ID_SELECTION.replace("+",
             PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
+
+        // 查询联系人数据，使用内容解析器访问联系人数据库
         Cursor cursor = context.getContentResolver().query(
-                Data.CONTENT_URI,
+            Data.CONTENT_URI, // 查询的 URI
-                new String[]{Phone.DISPLAY_NAME},
+            new String[]{Phone.DISPLAY_NAME}, // 查询的字段，这里只查询联系人名称
-                selection,
+            selection, // 查询条件
-                new String[]{phoneNumber},
+            new String[]{phoneNumber}, // 查询参数，电话号码
-                null);
+            null); // 排序条件，设置为 null 表示不排序
 
+        // 处理查询结果
         if (cursor != null && cursor.moveToFirst()) {
             try {
+                // 获取查询结果中的联系人名称
                 String name = cursor.getString(0);
+                // 将联系人名称缓存到 HashMap 中，以便下次快速访问
                 sContactCache.put(phoneNumber, name);
+                // 返回联系人名称
                 return name;
             } catch (IndexOutOfBoundsException e) {
-                Log.e(TAG, " Cursor get string error " + e.toString());
+                // 处理可能的索引越界异常，通常是由于查询结果为空或字段索引不正确
-                return null;
+                Log.e(TAG, "Cursor get string error " + e.toString());
+                return null; // 返回 null 表示未找到联系人
             } finally {
+                // 确保游标在使用后关闭，避免内存泄漏
                 cursor.close();
             }
         } else {
+            // 如果没有找到匹配的联系人，记录调试信息
             Log.d(TAG, "No contact matched with number:" + phoneNumber);
-            return null;
+            return null; // 返回 null 表示未找到联系人
         }
     }
 }

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

@@ -1,41 +1,45 @@
 /*
  * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
  *
- * Licensed under the Apache License, Version 2.0 (the "License");
+ * Licensed under Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
+ * 按照Apache许可证2.0版本许可。
- * You may obtain a copy of the License at
+ * 详情请参阅 http://www.apache.org/licenses/LICENSE-2.0
- *
- *        http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
  */
 
 package net.micode.notes.data;
 
 import android.net.Uri;
 
+/**
+ * Notes类用于定义便签和文件夹相关的数据结构和常量。
+ * 包括URI定义、字段映射和系统相关的标识符。
+ */
 public class Notes {
+
+    // 内容提供者的授权标识符，用于构建URI
     public static final String AUTHORITY = "micode_notes";
+
+    // 用于日志记录的标识符
     public static final String TAG = "Notes";
-    public static final int TYPE_NOTE = 0;
+
-    public static final int TYPE_FOLDER = 1;
+    // 类型常量，用于区分便签、文件夹和系统文件夹
-    public static final int TYPE_SYSTEM = 2;
+    public static final int TYPE_NOTE = 0;    // 普通便签
+    public static final int TYPE_FOLDER = 1; // 文件夹
+    public static final int TYPE_SYSTEM = 2; // 系统文件夹
 
     /**
-     * Following IDs are system folders' identifiers
+     * 系统文件夹的预定义ID：
-     * {@link Notes#ID_ROOT_FOLDER } is default folder
+     * - ID_ROOT_FOLDER：根文件夹，包含所有便签和文件夹。
-     * {@link Notes#ID_TEMPARAY_FOLDER } is for notes belonging no folder
+     * - ID_TEMPARAY_FOLDER：临时文件夹，存储未分配到具体文件夹的便签。
-     * {@link Notes#ID_CALL_RECORD_FOLDER} is to store call records
+     * - ID_CALL_RECORD_FOLDER：存储通话记录的文件夹。
+     * - ID_TRASH_FOLER：回收站文件夹，用于存储已删除的便签。
      */
     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附加数据的键名，用于便签的属性和元数据传递
     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";
@@ -43,236 +47,86 @@ public class Notes {
     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;
+    // 小部件类型常量，用于管理便签的小部件
-    public static final int TYPE_WIDGET_2X = 0;
+    public static final int TYPE_WIDGET_INVALIDE = -1; // 无效的小部件类型
-    public static final int TYPE_WIDGET_4X = 1;
+    public static final int TYPE_WIDGET_2X = 0;        // 2x2的小部件
+    public static final int TYPE_WIDGET_4X = 1;        // 4x4的小部件
+
     /**
-     * Uri to query all notes and folders
+     * URI定义：
+     * - CONTENT_NOTE_URI：用于查询所有便签和文件夹的数据。
+     * - CONTENT_DATA_URI：用于查询便签相关的数据内容。
      */
     public static final Uri CONTENT_NOTE_URI = Uri.parse("content://" + AUTHORITY + "/note");
-    /**
-     * Uri to query data
-     */
     public static final Uri CONTENT_DATA_URI = Uri.parse("content://" + AUTHORITY + "/data");
 
-    public interface NoteColumns {
-        /**
-         * The unique ID for a row
-         * <P> Type: INTEGER (long) </P>
-         */
-        public static final String ID = "_id";
-
-        /**
-         * The parent's id for note or folder
-         * <P> Type: INTEGER (long) </P>
-         */
-        public static final String PARENT_ID = "parent_id";
-
-        /**
-         * Created data for note or folder
-         * <P> Type: INTEGER (long) </P>
-         */
-        public static final String CREATED_DATE = "created_date";
-
-        /**
-         * Latest modified date
-         * <P> Type: INTEGER (long) </P>
-         */
-        public static final String MODIFIED_DATE = "modified_date";
-
-
-        /**
-         * Alert date
-         * <P> Type: INTEGER (long) </P>
-         */
-        public static final String ALERTED_DATE = "alert_date";
-
-        /**
-         * Folder's name or text content of note
-         * <P> Type: TEXT </P>
-         */
-        public static final String SNIPPET = "snippet";
-
-        /**
-         * Note's widget id
-         * <P> Type: INTEGER (long) </P>
-         */
-        public static final String WIDGET_ID = "widget_id";
-
-        /**
-         * Note's widget type
-         * <P> Type: INTEGER (long) </P>
-         */
-        public static final String WIDGET_TYPE = "widget_type";
-
-        /**
-         * Note's background color's id
-         * <P> Type: INTEGER (long) </P>
-         */
-        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
-         * <P> Type: INTEGER </P>
-         */
-        public static final String HAS_ATTACHMENT = "has_attachment";
-
     /**
-         * Folder's count of notes
+     * NoteColumns接口定义便签表的字段常量。
-         * <P> Type: INTEGER (long) </P>
      */
-        public static final String NOTES_COUNT = "notes_count";
+    public interface NoteColumns {
-
+        String ID = "_id";                      // 唯一标识ID
-        /**
+        String PARENT_ID = "parent_id";         // 父节点ID，标识便签或文件夹的父节点
-         * The file type: folder or note
+        String CREATED_DATE = "created_date";  // 创建时间戳
-         * <P> Type: INTEGER </P>
+        String MODIFIED_DATE = "modified_date"; // 最近修改时间戳
-         */
+        String ALERTED_DATE = "alert_date";    // 提醒时间
-        public static final String TYPE = "type";
+        String SNIPPET = "snippet";            // 文件夹名称或便签内容
-
+        String WIDGET_ID = "widget_id";        // 关联小部件的ID
-        /**
+        String WIDGET_TYPE = "widget_type";    // 小部件类型
-         * The last sync id
+        String BG_COLOR_ID = "bg_color_id";    // 背景颜色ID
-         * <P> Type: INTEGER (long) </P>
+        String HAS_ATTACHMENT = "has_attachment"; // 是否包含附件
-         */
+        String NOTES_COUNT = "notes_count";    // 文件夹中便签的数量
-        public static final String SYNC_ID = "sync_id";
+        String TYPE = "type";                  // 文件类型（便签或文件夹）
-
+        String SYNC_ID = "sync_id";            // 云同步ID
-        /**
+        String LOCAL_MODIFIED = "local_modified"; // 是否本地修改
-         * Sign to indicate local modified or not
+        String ORIGIN_PARENT_ID = "origin_parent_id"; // 移动前的原父节点ID
-         * <P> Type: INTEGER </P>
+        String GTASK_ID = "gtask_id";          // 用于同步的Google任务ID
-         */
+        String VERSION = "version";            // 版本号
-        public static final String LOCAL_MODIFIED = "local_modified";
-
-        /**
-         * Original parent id before moving into temporary folder
-         * <P> Type : INTEGER </P>
-         */
-        public static final String ORIGIN_PARENT_ID = "origin_parent_id";
-
-        /**
-         * The gtask id
-         * <P> Type : TEXT </P>
-         */
-        public static final String GTASK_ID = "gtask_id";
-
-        /**
-         * The version code
-         * <P> Type : INTEGER (long) </P>
-         */
-        public static final String VERSION = "version";
     }
 
-    public interface DataColumns {
-        /**
-         * The unique ID for a row
-         * <P> Type: INTEGER (long) </P>
-         */
-        public static final String ID = "_id";
-
     /**
-         * The MIME type of the item represented by this row.
+     * DataColumns接口定义数据表的字段常量。
-         * <P> Type: Text </P>
      */
-        public static final String MIME_TYPE = "mime_type";
+    public interface DataColumns {
-
+        String ID = "_id";                      // 唯一标识ID
-        /**
+        String MIME_TYPE = "mime_type";        // 数据的MIME类型
-         * The reference id to note that this data belongs to
+        String NOTE_ID = "note_id";            // 所属便签的引用ID
-         * <P> Type: INTEGER (long) </P>
+        String CREATED_DATE = "created_date"; // 创建时间戳
-         */
+        String MODIFIED_DATE = "modified_date"; // 最近修改时间戳
-        public static final String NOTE_ID = "note_id";
+        String CONTENT = "content";            // 数据内容
-
+        String DATA1 = "data1";                // 通用数据字段1
-        /**
+        String DATA2 = "data2";                // 通用数据字段2
-         * Created data for note or folder
+        String DATA3 = "data3";                // 通用数据字段3
-         * <P> Type: INTEGER (long) </P>
+        String DATA4 = "data4";                // 通用数据字段4
-         */
+        String DATA5 = "data5";                // 通用数据字段5
-        public static final String CREATED_DATE = "created_date";
+    }
-
-        /**
-         * Latest modified date
-         * <P> Type: INTEGER (long) </P>
-         */
-        public static final String MODIFIED_DATE = "modified_date";
-
-        /**
-         * Data's content
-         * <P> Type: TEXT </P>
-         */
-        public static final String CONTENT = "content";
-
-
-        /**
-         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
-         * integer data type
-         * <P> Type: INTEGER </P>
-         */
-        public static final String DATA1 = "data1";
-
-        /**
-         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
-         * integer data type
-         * <P> Type: INTEGER </P>
-         */
-        public static final String DATA2 = "data2";
-
-        /**
-         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
-         * TEXT data type
-         * <P> Type: TEXT </P>
-         */
-        public static final String DATA3 = "data3";
-
-        /**
-         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
-         * TEXT data type
-         * <P> Type: TEXT </P>
-         */
-        public static final String DATA4 = "data4";
 
     /**
-         * Generic data column, the meaning is {@link #MIMETYPE} specific, used for
+     * DataConstants类定义数据的特定类型常量。
-         * TEXT data type
-         * <P> Type: TEXT </P>
      */
-        public static final String DATA5 = "data5";
-    }
-
     public static class DataConstants {
-        public static final String NOTE = TextNote.CONTENT_ITEM_TYPE;
+        public static final String NOTE = TextNote.CONTENT_ITEM_TYPE;      // 文本便签
-        public static final String CALL_NOTE = CallNote.CONTENT_ITEM_TYPE;
+        public static final String CALL_NOTE = CallNote.CONTENT_ITEM_TYPE; // 通话记录便签
     }
 
-    public static final class TextNote implements DataColumns {
     /**
-         * Mode to indicate the text in check list mode or not
+     * TextNote类定义与文本便签相关的常量。
-         * <P> Type: Integer 1:check list mode 0: normal mode </P>
      */
-        public static final String MODE = DATA1;
+    public static final class TextNote implements DataColumns {
-
+        public static final String MODE = DATA1; // 检查列表模式
-        public static final int MODE_CHECK_LIST = 1;
+        public static final int MODE_CHECK_LIST = 1; // 检查列表模式标识
-
         public static final String CONTENT_TYPE = "vnd.android.cursor.dir/text_note";
-
         public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/text_note";
-
         public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/text_note");
     }
 
-    public static final class CallNote implements DataColumns {
     /**
-         * Call date for this record
+     * CallNote类定义与通话记录便签相关的常量。
-         * <P> Type: INTEGER (long) </P>
      */
-        public static final String CALL_DATE = DATA1;
+    public static final class CallNote implements DataColumns {
-
+        public static final String CALL_DATE = DATA1;     // 通话时间
-        /**
+        public static final String PHONE_NUMBER = DATA3;  // 电话号码
-         * Phone number for this record
-         * <P> Type: TEXT </P>
-         */
-        public static final String PHONE_NUMBER = DATA3;
-
         public static final String CONTENT_TYPE = "vnd.android.cursor.dir/call_note";
-
         public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/call_note";
-
         public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/call_note");
     }
 }

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

@@ -23,55 +23,61 @@ 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;
 
-
 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;
     private static final String TAG = "NotesDatabaseHelper";
+
+    // 创建 note 表的 SQL 语句
     private static final String CREATE_NOTE_TABLE_SQL =
         "CREATE TABLE " + TABLE.NOTE + "(" +
-                    NoteColumns.ID + " INTEGER PRIMARY KEY," +
+            NoteColumns.ID + " INTEGER PRIMARY KEY," +  // 主键
-                    NoteColumns.PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +  // 父级 ID
-                    NoteColumns.ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," +  // 提醒日期
-                    NoteColumns.BG_COLOR_ID + " INTEGER NOT NULL DEFAULT 0," +
+            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)," +
+            NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +  // 创建日期，默认为当前时间
-                    NoteColumns.HAS_ATTACHMENT + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.HAS_ATTACHMENT + " INTEGER NOT NULL DEFAULT 0," +  // 是否有附件
-                    NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
+            NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +  // 修改日期，默认为当前时间
-                    NoteColumns.NOTES_COUNT + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.NOTES_COUNT + " INTEGER NOT NULL DEFAULT 0," +  // 笔记数量
-                    NoteColumns.SNIPPET + " TEXT NOT NULL DEFAULT ''," +
+            NoteColumns.SNIPPET + " TEXT NOT NULL DEFAULT ''," +  // 摘要
-                    NoteColumns.TYPE + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.TYPE + " INTEGER NOT NULL DEFAULT 0," +  // 类型
-                    NoteColumns.WIDGET_ID + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.WIDGET_ID + " INTEGER NOT NULL DEFAULT 0," +  // 小部件 ID
-                    NoteColumns.WIDGET_TYPE + " INTEGER NOT NULL DEFAULT -1," +
+            NoteColumns.WIDGET_TYPE + " INTEGER NOT NULL DEFAULT -1," +  // 小部件类型
-                    NoteColumns.SYNC_ID + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.SYNC_ID + " INTEGER NOT NULL DEFAULT 0," +  // 同步 ID
-                    NoteColumns.LOCAL_MODIFIED + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.LOCAL_MODIFIED + " INTEGER NOT NULL DEFAULT 0," +  // 本地修改标识
-                    NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +
+            NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +  // 原始父级 ID
-                    NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''," +
+            NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''," +  // Google 任务 ID
-                    NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" +
+            NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" +  // 版本号
             ")";
+
+    // 创建 data 表的 SQL 语句
     private static final String CREATE_DATA_TABLE_SQL =
         "CREATE TABLE " + TABLE.DATA + "(" +
-                    DataColumns.ID + " INTEGER PRIMARY KEY," +
+            DataColumns.ID + " INTEGER PRIMARY KEY," +  // 主键
-                    DataColumns.MIME_TYPE + " TEXT NOT NULL," +
+            DataColumns.MIME_TYPE + " TEXT NOT NULL," +  // MIME 类型
-                    DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0," +
+            DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0," +  // 关联笔记 ID
-                    NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
+            NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +  // 创建日期，默认为当前时间
-                    NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
+            NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +  // 修改日期，默认为当前时间
-                    DataColumns.CONTENT + " TEXT NOT NULL DEFAULT ''," +
+            DataColumns.CONTENT + " TEXT NOT NULL DEFAULT ''," +  // 内容
-                    DataColumns.DATA1 + " INTEGER," +
+            DataColumns.DATA1 + " INTEGER," +  // 可选数据字段
-                    DataColumns.DATA2 + " INTEGER," +
+            DataColumns.DATA2 + " INTEGER," +  // 可选数据字段
-                    DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," +
+            DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," +  // 可选数据字段
-                    DataColumns.DATA4 + " TEXT NOT NULL DEFAULT ''," +
+            DataColumns.DATA4 + " TEXT NOT NULL DEFAULT ''," +  // 可选数据字段
-                    DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" +
+            DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" +  // 可选数据字段
             ")";
+
+    // 创建数据表的索引，基于 note_id
     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
+    // 以下是针对数据表进行的触发器操作
-     */
+
+    // 移动笔记到文件夹时增加文件夹内的笔记数量
     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 +
@@ -80,9 +86,8 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
             "   SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" +
             "  WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" +
             " END";
-    /**
+
-     * Decrease folder's note count when move note from folder
+    // 移动笔记出文件夹时减少文件夹内的笔记数量
-     */
     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 +
@@ -92,9 +97,8 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
             "  WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID +
             "  AND " + NoteColumns.NOTES_COUNT + ">0" + ";" +
             " END";
-    /**
+
-     * Increase folder's note count when insert new note to the folder
+    // 插入笔记到文件夹时增加文件夹内的笔记数量
-     */
     private static final String NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER =
         "CREATE TRIGGER increase_folder_count_on_insert " +
             " AFTER INSERT ON " + TABLE.NOTE +
@@ -103,9 +107,8 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
             "   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
+    // 删除笔记时减少文件夹内的笔记数量
-     */
     private static final String NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER =
         "CREATE TRIGGER decrease_folder_count_on_delete " +
             " AFTER DELETE ON " + TABLE.NOTE +
@@ -115,45 +118,8 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
             "  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}
+    // 删除笔记时删除关联的数据
-     */
-    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";
-    /**
-     * Update note's content when data with {@link DataConstants#NOTE} type has changed
-     */
-    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";
-    /**
-     * Update note's content when data with {@link DataConstants#NOTE} type has deleted
-     */
-    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";
-    /**
-     * Delete datas belong to note which has been deleted
-     */
     private static final String NOTE_DELETE_DATA_ON_DELETE_TRIGGER =
         "CREATE TRIGGER delete_data_on_delete " +
             " AFTER DELETE ON " + TABLE.NOTE +
@@ -161,9 +127,8 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
             "  DELETE FROM " + TABLE.DATA +
             "   WHERE " + DataColumns.NOTE_ID + "=old." + NoteColumns.ID + ";" +
             " END";
-    /**
+
-     * Delete notes belong to folder which has been deleted
+    // 删除文件夹时删除其中的所有笔记
-     */
     private static final String FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER =
         "CREATE TRIGGER folder_delete_notes_on_delete " +
             " AFTER DELETE ON " + TABLE.NOTE +
@@ -171,9 +136,8 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
             "  DELETE FROM " + TABLE.NOTE +
             "   WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" +
             " END";
-    /**
+
-     * Move notes belong to folder which has been moved to trash folder
+    // 当文件夹被移到垃圾桶时，文件夹内的笔记也移动到垃圾桶
-     */
     private static final String FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER =
         "CREATE TRIGGER folder_move_notes_on_trash " +
             " AFTER UPDATE ON " + TABLE.NOTE +
@@ -183,12 +147,16 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
             "   SET " + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER +
             "  WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" +
             " END";
+
+    // 唯一实例
     private static NotesDatabaseHelper mInstance;
 
+    // 构造方法
     public NotesDatabaseHelper(Context context) {
         super(context, DB_NAME, null, DB_VERSION);
     }
 
+    // 获取唯一实例
     static synchronized NotesDatabaseHelper getInstance(Context context) {
         if (mInstance == null) {
             mInstance = new NotesDatabaseHelper(context);
@@ -196,6 +164,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         return mInstance;
     }
 
+    // 创建 note 表
     public void createNoteTable(SQLiteDatabase db) {
         db.execSQL(CREATE_NOTE_TABLE_SQL);
         reCreateNoteTableTriggers(db);
@@ -203,6 +172,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         Log.d(TAG, "note table has been created");
     }
 
+    // 重新创建触发器
     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");
@@ -221,41 +191,35 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER);
     }
 
+    // 创建系统文件夹（如根文件夹、回收站等）
     private void createSystemFolder(SQLiteDatabase db) {
         ContentValues values = new ContentValues();
 
-        /**
+        // 插入“通话记录”文件夹
-         * call record foler for call notes
-         */
         values.put(NoteColumns.ID, Notes.ID_CALL_RECORD_FOLDER);
         values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
         db.insert(TABLE.NOTE, null, values);
 
-        /**
+        // 插入“根文件夹”
-         * root folder which is default folder
-         */
         values.clear();
         values.put(NoteColumns.ID, Notes.ID_ROOT_FOLDER);
         values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
         db.insert(TABLE.NOTE, null, values);
 
-        /**
+        // 插入“临时文件夹”
-         * temporary folder which is used for moving note
-         */
         values.clear();
         values.put(NoteColumns.ID, Notes.ID_TEMPARAY_FOLDER);
         values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
         db.insert(TABLE.NOTE, null, values);
 
-        /**
+        // 插入“回收站”文件夹
-         * create trash folder
-         */
         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 data 表
     public void createDataTable(SQLiteDatabase db) {
         db.execSQL(CREATE_DATA_TABLE_SQL);
         reCreateDataTableTriggers(db);
@@ -263,6 +227,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         Log.d(TAG, "data table has been created");
     }
 
+    // 重新创建 data 表的触发器
     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");
@@ -273,12 +238,14 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER);
     }
 
+    // 创建数据库
     @Override
     public void onCreate(SQLiteDatabase db) {
         createNoteTable(db);
         createDataTable(db);
     }
 
+    // 升级数据库
     @Override
     public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
         boolean reCreateTriggers = false;
@@ -312,6 +279,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         }
     }
 
+    // 升级到版本 2
     private void upgradeToV2(SQLiteDatabase db) {
         db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE);
         db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA);
@@ -319,29 +287,31 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
         createDataTable(db);
     }
 
+    // 升级到版本 3
     private void upgradeToV3(SQLiteDatabase db) {
-        // drop unused triggers
+        // 删除不再使用的触发器
         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
+        // 为笔记表增加一个字段，用于存储 gtask ID
         db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID
             + " TEXT NOT NULL DEFAULT ''");
-        // add a trash system folder
+        // 创建回收站文件夹
         ContentValues values = new ContentValues();
         values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
         values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
         db.insert(TABLE.NOTE, null, values);
     }
 
+    // 升级到版本 4
     private void upgradeToV4(SQLiteDatabase db) {
         db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION
             + " INTEGER NOT NULL DEFAULT 0");
     }
 
+    // 定义表名称常量
     public interface TABLE {
         public static final String NOTE = "note";
-
         public static final String DATA = "data";
     }
 }

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

@@ -16,7 +16,6 @@
 
 package net.micode.notes.data;
 
-
 import android.app.SearchManager;
 import android.content.ContentProvider;
 import android.content.ContentUris;
@@ -34,123 +33,144 @@ import net.micode.notes.data.Notes.DataColumns;
 import net.micode.notes.data.Notes.NoteColumns;
 import net.micode.notes.data.NotesDatabaseHelper.TABLE;
 
-
 public class NotesProvider extends ContentProvider {
+    // 定义 URI 匹配器，用来将传入的 URI 路径与预定义的常量匹配
     private static final UriMatcher mMatcher;
     private static final String TAG = "NotesProvider";
-    private static final int URI_NOTE = 1;
+
-    private static final int URI_NOTE_ITEM = 2;
+    // 定义常量，用于标识不同类型的 URI 请求
-    private static final int URI_DATA = 3;
+    private static final int URI_NOTE = 1; // 获取所有笔记
-    private static final int URI_DATA_ITEM = 4;
+    private static final int URI_NOTE_ITEM = 2; // 获取单个笔记
-    private static final int URI_SEARCH = 5;
+    private static final int URI_DATA = 3; // 获取所有数据
-    private static final int URI_SEARCH_SUGGEST = 6;
+    private static final int URI_DATA_ITEM = 4; // 获取单个数据
-    /**
+    private static final int URI_SEARCH = 5; // 搜索笔记
-     * x'0A' represents the '\n' character in sqlite. For title and content in the search result,
+    private static final int URI_SEARCH_SUGGEST = 6; // 搜索建议
-     * we will trim '\n' and white space in order to show more information.
+
-     */
+    // 定义搜索时返回的列，主要包括笔记 ID、笔记内容片段等
-    private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + ","
+    private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + "," +
-            + NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_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_1 + "," +
-            + "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_2 + ","
+        "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_2 + "," +
-            + R.drawable.search_result + " AS " + SearchManager.SUGGEST_COLUMN_ICON_1 + ","
+        R.drawable.search_result + " AS " + SearchManager.SUGGEST_COLUMN_ICON_1 + "," +
-            + "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + ","
+        "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + "," +
-            + "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA;
+        "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA;
-    private static String NOTES_SNIPPET_SEARCH_QUERY = "SELECT " + NOTES_SEARCH_PROJECTION
+
-            + " FROM " + TABLE.NOTE
+    // 定义搜索时的 SQL 查询语句，用于匹配包含特定关键词的笔记内容
-            + " WHERE " + NoteColumns.SNIPPET + " LIKE ?"
+    private static String NOTES_SNIPPET_SEARCH_QUERY = "SELECT " + NOTES_SEARCH_PROJECTION +
-            + " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER
+        " FROM " + TABLE.NOTE +
-            + " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE;
+        " WHERE " + NoteColumns.SNIPPET + " LIKE ?" +
+        " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER +  // 排除垃圾桶文件夹
+        " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE;  // 只查询普通笔记类型
 
     static {
-        mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
+        mMatcher = new UriMatcher(UriMatcher.NO_MATCH); // 初始化 URI 匹配器
-        mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE);
+
-        mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM);
+        // 为不同的 URI 路径添加匹配规则
-        mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA);
+        mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE); // 查询所有笔记
-        mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM);
+        mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM); // 查询单个笔记
-        mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH);
+        mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA); // 查询所有数据
-        mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST);
+        mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM); // 查询单个数据
-        mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST);
+        mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH); // 搜索笔记
+        mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY, URI_SEARCH_SUGGEST); // 搜索建议
+        mMatcher.addURI(Notes.AUTHORITY, SearchManager.SUGGEST_URI_PATH_QUERY + "/*", URI_SEARCH_SUGGEST); // 搜索建议
     }
 
+    // NotesDatabaseHelper 是数据库的辅助类，用来管理数据库的创建和版本更新
     private NotesDatabaseHelper mHelper;
 
+    // onCreate 方法，在 ContentProvider 创建时调用，用来初始化数据库助手
     @Override
     public boolean onCreate() {
-        mHelper = NotesDatabaseHelper.getInstance(getContext());
+        mHelper = NotesDatabaseHelper.getInstance(getContext()); // 获取数据库助手实例
-        return true;
+        return true; // 表示 ContentProvider 成功创建
     }
 
+    // 查询操作，根据 URI 的不同，查询不同的数据
     @Override
     public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
                         String sortOrder) {
-        Cursor c = null;
+        Cursor c = null;  // 定义一个 Cursor，用于返回查询结果
-        SQLiteDatabase db = mHelper.getReadableDatabase();
+        SQLiteDatabase db = mHelper.getReadableDatabase(); // 获取可读的 SQLite 数据库
         String id = null;
+
+        // 根据匹配的 URI 执行不同的查询操作
         switch (mMatcher.match(uri)) {
             case URI_NOTE:
-                c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null,
+                // 查询所有笔记
-                        sortOrder);
+                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); // 获取 URI 中的笔记 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,
+                // 查询所有数据
-                        sortOrder);
+                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); // 获取 URI 中的数据 ID
                 c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id
                     + parseSelection(selection), selectionArgs, null, null, sortOrder);
                 break;
             case URI_SEARCH:
             case URI_SEARCH_SUGGEST:
+                // 执行搜索操作，根据传入的关键词搜索笔记内容
                 if (sortOrder != null || projection != null) {
                     throw new IllegalArgumentException(
                         "do not specify sortOrder, selection, selectionArgs, or projection" + "with this query");
                 }
 
-                String searchString = null;
+                String searchString = null; // 搜索的关键词
                 if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
+                    // 如果是搜索建议，获取 URI 中的搜索词
                     if (uri.getPathSegments().size() > 1) {
                         searchString = uri.getPathSegments().get(1);
                     }
                 } else {
+                    // 如果是普通搜索，获取查询参数中的 "pattern"
                     searchString = uri.getQueryParameter("pattern");
                 }
 
+                // 如果搜索字符串为空，返回 null
                 if (TextUtils.isEmpty(searchString)) {
                     return null;
                 }
 
                 try {
-                    searchString = String.format("%%%s%%", searchString);
+                    searchString = String.format("%%%s%%", searchString); // 模糊匹配搜索词
-                    c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY,
+                    c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY, new String[]{searchString});
-                            new String[]{searchString});
                 } catch (IllegalStateException ex) {
-                    Log.e(TAG, "got exception: " + ex.toString());
+                    Log.e(TAG, "got exception: " + ex.toString()); // 如果查询出错，打印错误日志
                 }
                 break;
             default:
-                throw new IllegalArgumentException("Unknown URI " + uri);
+                throw new IllegalArgumentException("Unknown URI " + uri); // 如果 URI 无法匹配，抛出异常
         }
+
+        // 如果查询结果不为空，设置通知 URI，用于通知数据变化
         if (c != null) {
             c.setNotificationUri(getContext().getContentResolver(), uri);
         }
-        return c;
+        return c; // 返回查询结果
     }
 
+    // 插入数据操作，根据 URI 判断插入的表
     @Override
     public Uri insert(Uri uri, ContentValues values) {
-        SQLiteDatabase db = mHelper.getWritableDatabase();
+        SQLiteDatabase db = mHelper.getWritableDatabase(); // 获取可写的 SQLite 数据库
         long dataId = 0, noteId = 0, insertedId = 0;
+
+        // 根据 URI 匹配的结果执行不同的插入操作
         switch (mMatcher.match(uri)) {
             case URI_NOTE:
+                // 插入一条笔记数据
                 insertedId = noteId = db.insert(TABLE.NOTE, null, values);
                 break;
             case URI_DATA:
+                // 插入数据，首先确保 values 中包含 Note ID
                 if (values.containsKey(DataColumns.NOTE_ID)) {
                     noteId = values.getAsLong(DataColumns.NOTE_ID);
                 } else {
@@ -159,142 +179,157 @@ public class NotesProvider extends ContentProvider {
                 insertedId = dataId = db.insert(TABLE.DATA, null, values);
                 break;
             default:
-                throw new IllegalArgumentException("Unknown URI " + uri);
+                throw new IllegalArgumentException("Unknown URI " + uri); // 无效 URI，抛出异常
         }
-        // Notify the note uri
+
+        // 通知更新笔记数据
         if (noteId > 0) {
             getContext().getContentResolver().notifyChange(
                 ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null);
         }
 
-        // Notify the data uri
+        // 通知更新数据
         if (dataId > 0) {
             getContext().getContentResolver().notifyChange(
                 ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null);
         }
 
-        return ContentUris.withAppendedId(uri, insertedId);
+        return ContentUris.withAppendedId(uri, insertedId); // 返回插入数据的 URI
     }
 
+    // 删除数据操作，根据 URI 匹配执行不同的删除操作
     @Override
     public int delete(Uri uri, String selection, String[] selectionArgs) {
-        int count = 0;
+        int count = 0; // 记录删除的行数
         String id = null;
-        SQLiteDatabase db = mHelper.getWritableDatabase();
+        SQLiteDatabase db = mHelper.getWritableDatabase(); // 获取可写的 SQLite 数据库
         boolean deleteData = false;
+
+        // 根据 URI 匹配结果执行不同的删除操作
         switch (mMatcher.match(uri)) {
             case URI_NOTE:
-                selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
+                // 删除所有笔记
-                count = db.delete(TABLE.NOTE, selection, selectionArgs);
+                selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 "; // 添加 ID 限制条件
+                count = db.delete(TABLE.NOTE, selection, selectionArgs); // 删除数据
                 break;
             case URI_NOTE_ITEM:
-                id = uri.getPathSegments().get(1);
+                // 删除单个笔记
-                /**
+                id = uri.getPathSegments().get(1); // 获取笔记 ID
-                 * ID that smaller than 0 is system folder which is not allowed to
-                 * trash
-                 */
                 long noteId = Long.valueOf(id);
                 if (noteId <= 0) {
                     break;
                 }
                 count = db.delete(TABLE.NOTE,
-                        NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
+                    NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs); // 删除指定笔记
                 break;
             case URI_DATA:
-                count = db.delete(TABLE.DATA, selection, selectionArgs);
+                // 删除所有数据
+                count = db.delete(TABLE.DATA, selection, selectionArgs); // 删除数据
                 deleteData = true;
                 break;
             case URI_DATA_ITEM:
-                id = uri.getPathSegments().get(1);
+                // 删除单个数据
+                id = uri.getPathSegments().get(1); // 获取数据 ID
                 count = db.delete(TABLE.DATA,
-                        DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
+                    DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs); // 删除指定数据
                 deleteData = true;
                 break;
             default:
-                throw new IllegalArgumentException("Unknown URI " + uri);
+                throw new IllegalArgumentException("Unknown URI " + uri); // 无效 URI，抛出异常
         }
+
+        // 删除成功后，通知相应的数据变化
         if (count > 0) {
             if (deleteData) {
-                getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
+                getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null); // 通知笔记数据变化
             }
-            getContext().getContentResolver().notifyChange(uri, null);
+            getContext().getContentResolver().notifyChange(uri, null); // 通知数据变化
         }
-        return count;
+        return count; // 返回删除的行数
     }
 
+    // 更新数据操作，根据 URI 匹配执行不同的更新操作
     @Override
     public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
         int count = 0;
         String id = null;
-        SQLiteDatabase db = mHelper.getWritableDatabase();
+        SQLiteDatabase db = mHelper.getWritableDatabase(); // 获取可写的 SQLite 数据库
         boolean updateData = false;
+
+        // 根据 URI 匹配的结果执行不同的更新操作
         switch (mMatcher.match(uri)) {
             case URI_NOTE:
-                increaseNoteVersion(-1, selection, selectionArgs);
+                // 更新所有笔记
-                count = db.update(TABLE.NOTE, values, selection, selectionArgs);
+                increaseNoteVersion(-1, selection, selectionArgs); // 增加版本号
+                count = db.update(TABLE.NOTE, values, selection, selectionArgs); // 更新笔记数据
                 break;
             case URI_NOTE_ITEM:
-                id = uri.getPathSegments().get(1);
+                // 更新单个笔记
-                increaseNoteVersion(Long.valueOf(id), selection, selectionArgs);
+                id = uri.getPathSegments().get(1); // 获取笔记 ID
+                increaseNoteVersion(Long.valueOf(id), selection, selectionArgs); // 增加指定笔记的版本号
                 count = db.update(TABLE.NOTE, values, NoteColumns.ID + "=" + id
-                        + parseSelection(selection), selectionArgs);
+                    + parseSelection(selection), selectionArgs); // 更新指定笔记
                 break;
             case URI_DATA:
-                count = db.update(TABLE.DATA, values, selection, selectionArgs);
+                // 更新所有数据
+                count = db.update(TABLE.DATA, values, selection, selectionArgs); // 更新数据
                 updateData = true;
                 break;
             case URI_DATA_ITEM:
-                id = uri.getPathSegments().get(1);
+                // 更新单个数据
+                id = uri.getPathSegments().get(1); // 获取数据 ID
                 count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id
-                        + parseSelection(selection), selectionArgs);
+                    + parseSelection(selection), selectionArgs); // 更新指定数据
                 updateData = true;
                 break;
             default:
-                throw new IllegalArgumentException("Unknown URI " + uri);
+                throw new IllegalArgumentException("Unknown URI " + uri); // 无效 URI，抛出异常
         }
 
+        // 更新成功后，通知相应的数据变化
         if (count > 0) {
             if (updateData) {
-                getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
+                getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null); // 通知笔记数据变化
             }
-            getContext().getContentResolver().notifyChange(uri, null);
+            getContext().getContentResolver().notifyChange(uri, null); // 通知数据变化
         }
-        return count;
+        return count; // 返回更新的行数
     }
 
+    // 辅助方法：解析选择条件，生成 SQL 查询的 WHERE 子句
     private String parseSelection(String selection) {
         return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
     }
 
+    // 辅助方法：增加笔记的版本号
     private void increaseNoteVersion(long id, String selection, String[] selectionArgs) {
-        StringBuilder sql = new StringBuilder(120);
+        StringBuilder sql = new StringBuilder(120); // 使用 StringBuilder 构建 SQL 查询
         sql.append("UPDATE ");
-        sql.append(TABLE.NOTE);
+        sql.append(TABLE.NOTE); // 更新笔记表
         sql.append(" SET ");
-        sql.append(NoteColumns.VERSION);
+        sql.append(NoteColumns.VERSION); // 更新版本号字段
-        sql.append("=" + NoteColumns.VERSION + "+1 ");
+        sql.append("=" + NoteColumns.VERSION + "+1 "); // 将版本号加1
 
         if (id > 0 || !TextUtils.isEmpty(selection)) {
-            sql.append(" WHERE ");
+            sql.append(" WHERE "); // 如果指定了 ID 或者其他选择条件，添加 WHERE 子句
         }
         if (id > 0) {
-            sql.append(NoteColumns.ID + "=" + String.valueOf(id));
+            sql.append(NoteColumns.ID + "=" + String.valueOf(id)); // 如果指定了笔记 ID，更新对应笔记
         }
         if (!TextUtils.isEmpty(selection)) {
             String selectString = id > 0 ? parseSelection(selection) : selection;
             for (String args : selectionArgs) {
-                selectString = selectString.replaceFirst("\\?", args);
+                selectString = selectString.replaceFirst("\\?", args); // 替换选择条件中的占位符
             }
-            sql.append(selectString);
+            sql.append(selectString); // 添加选择条件
         }
 
-        mHelper.getWritableDatabase().execSQL(sql.toString());
+        mHelper.getWritableDatabase().execSQL(sql.toString()); // 执行 SQL 更新语句
     }
 
+    // 获取 MIME 类型，当前未实现，直接返回 null
     @Override
     public String getType(Uri uri) {
-        // TODO Auto-generated method stub
         return null;
     }
-
 }