5.30

src/Contact.java

@@ -0,0 +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
+ *
+ *        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.
+ */
+
+// 定义包名，指明该类所在的包路径
+package net.micode.notes.data;
+
+// 导入所需的Android类和工具库
+import android.content.Context;
+import android.database.Cursor;
+import android.provider.ContactsContract.CommonDataKinds.Phone;
+import android.provider.ContactsContract.Data;
+import android.telephony.PhoneNumberUtils;
+import android.util.Log;
+
+// 导入Java工具库中的HashMap
+import java.util.HashMap;
+
+// 定义Contact类，用于处理与联系人相关的操作
+public class Contact {
+    // 静态HashMap，用于缓存电话号码与联系人姓名的映射关系，避免重复查询数据库
+    private static HashMap<String, String> sContactCache;
+    // 日志标签，用于在Logcat中标识日志来源
+    private static final String TAG = "Contact";
+
+    // 定义查询条件字符串，用于在联系人数据库中匹配电话号码
+    // PHONE_NUMBERS_EQUAL用于比较号码是否相等，考虑格式化差异（如空格、短横线）
+    // Data.MIMETYPE过滤只处理电话类型的数据条目
+    // Data.RAW_CONTACT_ID子查询确保通过phone_lookup表快速匹配最小匹配长度的号码
+    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 = '+')"; // '+'将在运行时被替换为最小匹配长度
+
+    // 静态方法：根据电话号码查询联系人姓名
+    public static String getContact(Context context, String phoneNumber) {
+        // 如果缓存未初始化，则创建新的HashMap实例
+        if(sContactCache == null) {
+            sContactCache = new HashMap<String, String>();
+        }
+
+        // 检查缓存中是否存在该号码的姓名，存在则直接返回
+        if(sContactCache.containsKey(phoneNumber)) {
+            return sContactCache.get(phoneNumber);
+        }
+
+        // 将CALLER_ID_SELECTION中的'+'替换为实际的最小匹配长度值（如7或8位）
+        // PhoneNumberUtils.toCallerIDMinMatch(phoneNumber)根据号码生成最小匹配长度
+        String selection = CALLER_ID_SELECTION.replace("+",
+                PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
+
+        // 通过ContentResolver查询联系人数据库
+        // Data.CONTENT_URI：访问联系人数据的URI
+        // 查询的列：Phone.DISPLAY_NAME（联系人显示名称）
+        // 查询条件：动态生成的selection，参数为phoneNumber
+        Cursor cursor = context.getContentResolver().query(
+                Data.CONTENT_URI,
+                new String [] { Phone.DISPLAY_NAME },
+                selection,
+                new String[] { phoneNumber },
+                null); // 排序方式为null
+
+        // 处理查询结果
+        if (cursor != null && cursor.moveToFirst()) {
+            try {
+                // 获取第0列的数据（DISPLAY_NAME）
+                String name = cursor.getString(0);
+                // 将结果存入缓存
+                sContactCache.put(phoneNumber, name);
+                return name;
+            } catch (IndexOutOfBoundsException e) {
+                // 捕获列索引错误（理论上不会发生，因查询明确指定了DISPLAY_NAME）
+                Log.e(TAG, " Cursor get string error " + e.toString());
+                return null;
+            } finally {
+                // 确保关闭Cursor释放资源
+                cursor.close();
+            }
+        } else {
+            // 无匹配结果时记录日志
+            Log.d(TAG, "No contact matched with number:" + phoneNumber);
+            return null;
+        }
+    }
+}

src/NoteWidgetProvider.java

@@ -0,0 +1,151 @@
+/*
+ * 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
+ *
+ *        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.widget;
+
+ // 导入Android小部件相关类和自定义类
+ import android.app.PendingIntent;
+ import android.appwidget.AppWidgetManager;
+ import android.appwidget.AppWidgetProvider;
+ import android.content.ContentValues;
+ import android.content.Context;
+ import android.content.Intent;
+ import android.database.Cursor;
+ import android.util.Log;
+ import android.widget.RemoteViews;
+ import net.micode.notes.R;
+ import net.micode.notes.data.Notes;
+ import net.micode.notes.data.Notes.NoteColumns;
+ import net.micode.notes.tool.ResourceParser;
+ import net.micode.notes.ui.NoteEditActivity;
+ import net.micode.notes.ui.NotesListActivity;
+ 
+ // 抽象类，用于实现笔记桌面小部件功能
+ public abstract class NoteWidgetProvider extends AppWidgetProvider {
+     // 定义查询笔记时需要的列（ID、背景颜色ID、内容片段）
+     public static final String[] PROJECTION = new String[]{
+             NoteColumns.ID,
+             NoteColumns.BG_COLOR_ID,
+             NoteColumns.SNIPPET
+     };
+ 
+     // 列索引常量
+     public static final int COLUMN_ID = 0;          // 笔记ID列索引
+     public static final int COLUMN_BG_COLOR_ID = 1; // 背景颜色ID列索引
+     public static final int COLUMN_SNIPPET = 2;     // 内容片段列索引
+ 
+     private static final String TAG = "NoteWidgetProvider"; // 日志标签
+ 
+     // 当小部件被删除时调用
+     @Override
+     public void onDeleted(Context context, int[] appWidgetIds) {
+         ContentValues values = new ContentValues();
+         values.put(NoteColumns.WIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID); // 重置widget_id字段
+         for (int appWidgetId : appWidgetIds) {
+             // 更新数据库，清除被删除小部件关联的笔记的widget_id
+             context.getContentResolver().update(
+                     Notes.CONTENT_NOTE_URI,
+                     values,
+                     NoteColumns.WIDGET_ID + "=?",
+                     new String[]{String.valueOf(appWidgetId)}
+             );
+         }
+     }
+ 
+     // 获取指定小部件ID关联的笔记信息（排除垃圾箱中的笔记）
+     private Cursor getNoteWidgetInfo(Context context, int widgetId) {
+         return context.getContentResolver().query(
+                 Notes.CONTENT_NOTE_URI,
+                 PROJECTION,
+                 NoteColumns.WIDGET_ID + "=? AND " + NoteColumns.PARENT_ID + "<>?",
+                 new String[]{String.valueOf(widgetId), String.valueOf(Notes.ID_TRASH_FOLER)},
+                 null
+         );
+     }
+ 
+     // 更新小部件界面（公开方法）
+     protected void update(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
+         update(context, appWidgetManager, appWidgetIds, false); // 默认非隐私模式
+     }
+ 
+     // 实际更新逻辑
+     private void update(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds,
+                        boolean privacyMode) {
+         for (int appWidgetId : appWidgetIds) {
+             if (appWidgetId == AppWidgetManager.INVALID_APPWIDGET_ID) continue;
+ 
+             int bgId = ResourceParser.getDefaultBgId(context); // 获取默认背景ID
+             String snippet = ""; // 内容片段
+             Intent intent = new Intent(context, NoteEditActivity.class); // 编辑笔记的Intent
+             intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP); // 单例模式启动
+             intent.putExtra(Notes.INTENT_EXTRA_WIDGET_ID, appWidgetId); // 传递小部件ID
+             intent.putExtra(Notes.INTENT_EXTRA_WIDGET_TYPE, getWidgetType()); // 小部件类型
+ 
+             // 查询数据库获取笔记信息
+             try (Cursor c = getNoteWidgetInfo(context, appWidgetId)) {
+                 if (c != null && c.moveToFirst()) {
+                     if (c.getCount() > 1) { // 异常情况：多个笔记关联同一个小部件
+                         Log.e(TAG, "Multiple notes with same widget id:" + appWidgetId);
+                         return;
+                     }
+                     snippet = c.getString(COLUMN_SNIPPET); // 获取内容片段
+                     bgId = c.getInt(COLUMN_BG_COLOR_ID); // 获取背景ID
+                     intent.putExtra(Intent.EXTRA_UID, c.getLong(COLUMN_ID)); // 传递笔记ID
+                     intent.setAction(Intent.ACTION_VIEW); // 查看模式
+                 } else { // 没有关联的笔记
+                     snippet = context.getString(R.string.widget_havenot_content);
+                     intent.setAction(Intent.ACTION_INSERT_OR_EDIT); // 新建笔记
+                 }
+             }
+ 
+             RemoteViews rv = new RemoteViews(context.getPackageName(), getLayoutId()); // 创建远程视图
+             rv.setImageViewResource(R.id.widget_bg_image, getBgResourceId(bgId)); // 设置背景
+             intent.putExtra(Notes.INTENT_EXTRA_BACKGROUND_ID, bgId); // 传递背景ID
+ 
+             // 创建PendingIntent处理点击事件
+             PendingIntent pendingIntent;
+             if (privacyMode) { // 隐私模式
+                 rv.setTextViewText(R.id.widget_text, context.getString(R.string.widget_under_visit_mode));
+                 pendingIntent = PendingIntent.getActivity(
+                         context,
+                         appWidgetId,
+                         new Intent(context, NotesListActivity.class), // 跳转到列表
+                         PendingIntent.FLAG_UPDATE_CURRENT // 更新现有Intent
+                 );
+             } else { // 正常模式
+                 rv.setTextViewText(R.id.widget_text, snippet); // 显示内容片段
+                 pendingIntent = PendingIntent.getActivity(
+                         context,
+                         appWidgetId,
+                         intent,
+                         PendingIntent.FLAG_UPDATE_CURRENT
+                 );
+             }
+ 
+             rv.setOnClickPendingIntent(R.id.widget_text, pendingIntent); // 绑定点击事件
+             appWidgetManager.updateAppWidget(appWidgetId, rv); // 更新小部件
+         }
+     }
+ 
+     // 抽象方法：子类需实现背景资源映射
+     protected abstract int getBgResourceId(int bgId);
+ 
+     // 抽象方法：子类需提供布局ID
+     protected abstract int getLayoutId();
+ 
+     // 抽象方法：子类需定义小部件类型
+     protected abstract int getWidgetType();
+ }

src/NoteWidgetProvider_2x.java

@@ -0,0 +1,95 @@
+/*
+ * 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
+ *
+ *        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.widget;
+
+ import android.appwidget.AppWidgetManager;
+ import android.content.Context;
+ import net.micode.notes.R;
+ import net.micode.notes.data.Notes;
+ import net.micode.notes.tool.ResourceParser;
+ 
+ /**
+  * 2x尺寸笔记小部件实现类
+  * 
+  * 采用模板方法模式，继承抽象父类NoteWidgetProvider
+  * 实现特定尺寸小部件的差异化配置
+  */
+ public class NoteWidgetProvider_2x extends NoteWidgetProvider {
+     
+     /**
+      * 小部件更新事件处理
+      * 
+      * @param context 上下文对象
+      * @param appWidgetManager 小部件管理服务
+      * @param appWidgetIds 需要更新小部件的ID数组
+      * 
+      * 功能说明：
+      * 1. 通过super.update调用父类统一更新逻辑
+      * 2. 继承自AppWidgetProvider的标准生命周期方法
+      * 3. 不需要额外逻辑时仍建议保留空实现以保证扩展性
+      */
+     @Override
+     public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
+         super.update(context, appWidgetManager, appWidgetIds); // 触发父类更新流程
+     }
+ 
+     /**
+      * 获取小部件布局资源ID
+      * 
+      * @return int 布局文件ID（R.layout.widget_2x）
+      * 
+      * 设计要点：
+      * 1. 实现父类定义的抽象方法
+      * 2. 不同尺寸小部件通过此方法返回不同布局
+      * 3. 对应布局文件widget_2x.xml定义2x尺寸特有UI结构
+      */
+     @Override
+     protected int getLayoutId() {
+         return R.layout.widget_2x; // 返回2x尺寸专用布局
+     }
+ 
+     /**
+      * 背景资源映射方法
+      * 
+      * @param bgId 数据库存储的背景ID
+      * @return int 实际drawable资源ID
+      * 
+      * 实现逻辑：
+      * 1. 通过ResourceParser转换通用ID为具体资源
+      * 2. 不同尺寸小部件可使用不同背景资源
+      * 3. 保证数据层与视图层解耦
+      */
+     @Override
+     protected int getBgResourceId(int bgId) {
+         return ResourceParser.WidgetBgResources.getWidget2xBgResource(bgId); // 获取2x专用背景
+     }
+ 
+     /**
+      * 获取小部件类型标识
+      * 
+      * @return int 类型常量（Notes.TYPE_WIDGET_2X）
+      * 
+      * 作用说明：
+      * 1. 在数据库层面区分不同小部件类型
+      * 2. 用于后续的更新/查询操作
+      * 3. 与NoteColumns.WIDGET_ID字段配合使用
+      */
+     @Override
+     protected int getWidgetType() {
+         return Notes.TYPE_WIDGET_2X; // 类型标识常量
+     }
+ }

src/NoteWidgetProvider_4x.java

@@ -0,0 +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
+ *
+ *        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.widget;
+
+ import android.appwidget.AppWidgetManager;
+ import android.content.Context;
+ import net.micode.notes.R;
+ import net.micode.notes.data.Notes;
+ import net.micode.notes.tool.ResourceParser;
+ 
+ /**
+  * 4x尺寸笔记小部件实现类
+  * 
+  * 继承自抽象基类NoteWidgetProvider
+  * 实现4x尺寸小部件的差异化配置
+  * 
+  * 设计要点：
+  * 1. 采用模板方法模式复用父类核心逻辑
+  * 2. 通过类型标识实现多尺寸支持
+  * 3. 独立维护尺寸相关资源
+  */
+ public class NoteWidgetProvider_4x extends NoteWidgetProvider {
+ 
+     /**
+      * 小部件更新事件入口
+      * 
+      * @param context 上下文环境
+      * @param appWidgetManager 小部件管理服务
+      * @param appWidgetIds 需要更新小部件的ID数组
+      * 
+      * 实现说明：
+      * 1. 直接调用父类update方法处理通用更新流程
+      * 2. 保留方法重写以支持未来扩展4x特有逻辑
+      */
+     @Override
+     public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
+         super.update(context, appWidgetManager, appWidgetIds); // 触发父类统一更新流程
+     }
+ 
+     /**
+      * 获取4x尺寸布局资源
+      * 
+      * @return int 布局文件ID（R.layout.widget_4x）
+      * 
+      * 关联文件：
+      * - res/layout/widget_4x.xml 定义4x专属布局结构
+      * - res/layout-sw600dp/widget_4x.xml 平板设备适配布局
+      */
+     @Override
+     protected int getLayoutId() {
+         return R.layout.widget_4x; // 4x尺寸专用布局资源
+     }
+ 
+     /**
+      * 背景资源转换方法
+      * 
+      * @param bgId 数据库存储的背景标识符
+      * @return int 实际Drawable资源ID
+      * 
+      * 设计优势：
+      * 1. 通过ResourceParser解耦数据存储与界面表现
+      * 2. 允许4x尺寸使用与其他尺寸不同的背景样式
+      * 3. 支持动态主题切换（示例）：
+      *    if(isDarkMode) return darkBgResources.get(bgId);
+      */
+     @Override
+     protected int getBgResourceId(int bgId) {
+         return ResourceParser.WidgetBgResources.getWidget4xBgResource(bgId); // 获取4x专用背景
+     }
+ 
+     /**
+      * 获取小部件类型标识
+      * 
+      * @return int 类型常量（Notes.TYPE_WIDGET_4X）
+      * 
+      * 数据库应用：
+      * 1. 在notes表中通过widget_type字段存储该值
+      * 2. 查询时可用类型过滤：SELECT * FROM notes WHERE widget_type = 4
+      * 3. 支持统计各尺寸小部件使用量
+      */
+     @Override
+     protected int getWidgetType() {
+         return Notes.TYPE_WIDGET_4X; // 类型标识常量值为4
+     }
+ }

src/Notes.java

@@ -0,0 +1,212 @@
+/*
+ * 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
+ *
+ *        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.
+ */
+
+// 定义包名，指明该类所在的包路径
+package net.micode.notes.data;
+
+// 导入Android Uri类，用于构建ContentProvider的URI
+import android.net.Uri;
+
+/**
+ * 定义笔记应用的核心数据模型类
+ * 包含数据库表结构定义、ContentProvider URI、类型常量等全局配置
+ */
+public class Notes {
+    // ContentProvider的授权标识，对应AndroidManifest.xml中配置的authorities
+    public static final String AUTHORITY = "micode_notes";
+    
+    // 日志标签，用于在Logcat中标识日志来源
+    public static final String TAG = "Notes";
+    
+    // 定义笔记项的类型常量
+    public static final int TYPE_NOTE     = 0;   // 普通笔记类型
+    public static final int TYPE_FOLDER   = 1;   // 文件夹类型
+    public static final int TYPE_SYSTEM   = 2;   // 系统文件夹类型
+
+    /**
+     * 系统文件夹的标识符常量：
+     * {@link Notes#ID_ROOT_FOLDER } 根文件夹（默认文件夹）
+     * {@link Notes#ID_TEMPARAY_FOLDER } 临时文件夹（存放未分类笔记）
+     * {@link Notes#ID_CALL_RECORD_FOLDER} 通话记录文件夹
+     * 注意：ID_TRASH_FOLER可能存在拼写错误，应为ID_TRASH_FOLDER
+     */
+    public static final int ID_ROOT_FOLDER = 0;           // 根文件夹ID
+    public static final int ID_TEMPARAY_FOLDER = -1;      // 临时文件夹ID（拼写错误TEMPARAY应为TEMPORARY）
+    public static final int ID_CALL_RECORD_FOLDER = -2;   // 通话记录文件夹ID
+    public static final int ID_TRASH_FOLER = -3;          // 回收站文件夹ID（拼写错误FOLER应为FOLDER）
+
+    // Intent附加数据键名常量，用于Activity间传递数据
+    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"; // 背景色ID
+    public static final String INTENT_EXTRA_WIDGET_ID = "net.micode.notes.widget_id";            // 桌面小部件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
+
+    // 桌面小部件类型常量
+    public static final int TYPE_WIDGET_INVALIDE      = -1;  // 无效小部件类型
+    public static final int TYPE_WIDGET_2X            = 0;   // 2x尺寸小部件
+    public static final int TYPE_WIDGET_4X            = 1;   // 4x尺寸小部件
+
+    /**
+     * 数据项类型常量内部类
+     * 定义不同笔记类型的MIME类型
+     */
+    public static class DataConstants {
+        public static final String NOTE = TextNote.CONTENT_ITEM_TYPE;      // 文本笔记类型
+        public static final String CALL_NOTE = CallNote.CONTENT_ITEM_TYPE;// 通话笔记类型
+    }
+
+    /**
+     * ContentProvider URI定义
+     */
+    // 查询所有笔记和文件夹的URI（content://micode_notes/note）
+    public static final Uri CONTENT_NOTE_URI = Uri.parse("content://" + AUTHORITY + "/note");
+    
+    // 查询所有数据项的URI（content://micode_notes/data）
+    public static final Uri CONTENT_DATA_URI = Uri.parse("content://" + AUTHORITY + "/data");
+
+    /**
+     * 笔记表列名接口定义
+     * 对应数据库表中的字段名称和数据类型
+     */
+    public interface NoteColumns {
+        /** 唯一标识符（长整型） */
+        public static final String ID = "_id";
+
+        /** 父项ID（用于构建层级结构，长整型） */
+        public static final String PARENT_ID = "parent_id";
+
+        /** 创建时间（Unix时间戳，长整型） */
+        public static final String CREATED_DATE = "created_date";
+
+        /** 最后修改时间（Unix时间戳，长整型） */
+        public static final String MODIFIED_DATE = "modified_date";
+
+        /** 提醒时间（Unix时间戳，长整型） */
+        public static final String ALERTED_DATE = "alert_date";
+
+        /** 内容摘要（文件夹名称或笔记前几句文本） */
+        public static final String SNIPPET = "snippet";
+
+        /** 关联的桌面小部件ID（长整型） */
+        public static final String WIDGET_ID = "widget_id";
+
+        /** 小部件类型（0:2x,1:4x，长整型） */
+        public static final String WIDGET_TYPE = "widget_type";
+
+        /** 背景颜色ID（长整型） */
+        public static final String BG_COLOR_ID = "bg_color_id";
+
+        /** 是否有附件（0/1整型） */
+        public static final String HAS_ATTACHMENT = "has_attachment";
+
+        /** 包含的笔记数量（仅文件夹有效，长整型） */
+        public static final String NOTES_COUNT = "notes_count";
+
+        /** 条目类型（0笔记/1文件夹/2系统，整型） */
+        public static final String TYPE = "type";
+
+        /** 同步ID（用于云端同步，长整型） */
+        public static final String SYNC_ID = "sync_id";
+
+        /** 本地修改标记（0未修改/1已修改，整型） */
+        public static final String LOCAL_MODIFIED = "local_modified";
+
+        /** 移动前的原始父ID（用于临时文件夹操作，整型） */
+        public static final String ORIGIN_PARENT_ID = "origin_parent_id";
+
+        /** Google Task ID（同步相关，文本） */
+        public static final String GTASK_ID = "gtask_id";
+
+        /** 数据版本号（长整型） */
+        public static final String VERSION = "version";
+    }
+
+    /**
+     * 数据表列名接口定义
+     * 存储笔记的具体内容数据
+     */
+    public interface DataColumns {
+        /** 唯一标识符（长整型） */
+        public static final String ID = "_id";
+
+        /** MIME类型（决定数据项类型，如text_note/call_note） */
+        public static final String MIME_TYPE = "mime_type";
+
+        /** 关联的笔记ID（外键，长整型） */
+        public static final String NOTE_ID = "note_id";
+
+        /** 创建时间（Unix时间戳，长整型） */
+        public static final String CREATED_DATE = "created_date";
+
+        /** 最后修改时间（Unix时间戳，长整型） */
+        public static final String MODIFIED_DATE = "modified_date";
+
+        /** 主要内容（文本笔记的完整内容） */
+        public static final String CONTENT = "content";
+
+        // 通用数据列（根据MIME_TYPE不同用途不同）
+        /** 通用整型数据1（如文本笔记的列表模式） */
+        public static final String DATA1 = "data1";
+        
+        /** 通用整型数据2 */
+        public static final String DATA2 = "data2";
+        
+        /** 通用文本数据3（如通话记录的电话号码） */
+        public static final String DATA3 = "data3";
+        
+        /** 通用文本数据4 */
+        public static final String DATA4 = "data4";
+        
+        /** 通用文本数据5 */
+        public static final String DATA5 = "data5";
+    }
+
+    /**
+     * 文本笔记数据定义（继承DataColumns）
+     */
+    public static final class TextNote implements DataColumns {
+        /** 列表模式标识（DATA1列，1=清单模式，0=普通模式） */
+        public static final String MODE = DATA1;
+        public static final int MODE_CHECK_LIST = 1;  // 清单模式常量
+
+        // MIME类型定义
+        public static final String CONTENT_TYPE = "vnd.android.cursor.dir/text_note";         // 多条目类型
+        public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/text_note";   // 单条目类型
+
+        // 文本笔记的ContentProvider URI（content://micode_notes/text_note）
+        public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/text_note");
+    }
+
+    /**
+     * 通话记录笔记数据定义（继承DataColumns）
+     */
+    public static final class CallNote implements DataColumns {
+        /** 通话日期（使用DATA1列存储Unix时间戳） */
+        public static final String CALL_DATE = DATA1;
+        
+        /** 电话号码（使用DATA3列存储） */
+        public static final String PHONE_NUMBER = DATA3;
+
+        // MIME类型定义
+        public static final String CONTENT_TYPE = "vnd.android.cursor.dir/call_note";         // 多条目类型
+        public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/call_note";   // 单条目类型
+
+        // 通话笔记的ContentProvider URI（content://micode_notes/call_note）
+        public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/call_note");
+    }
+}

src/NotesDatabaseHelper.java

@@ -0,0 +1,375 @@
+/*
+ * 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
+ *
+ *        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.
+ */
+
+// 定义包名，指明该类所在的包路径
+package net.micode.notes.data;
+
+// 导入Android数据库操作相关类
+import android.content.ContentValues;
+import android.content.Context;
+import android.database.sqlite.SQLiteDatabase;
+import android.database.sqlite.SQLiteOpenHelper;
+import android.util.Log;
+
+// 导入自定义的笔记数据模型类
+import net.micode.notes.data.Notes.DataColumns;
+import net.micode.notes.data.Notes.DataConstants;
+import net.micode.notes.data.Notes.NoteColumns;
+
+/**
+ * 数据库帮助类，继承自SQLiteOpenHelper
+ * 负责数据库创建、版本升级及表结构管理
+ */
+public class NotesDatabaseHelper extends SQLiteOpenHelper {
+    // 数据库名称常量
+    private static final String DB_NAME = "note.db";
+    // 数据库版本号（当前版本4）
+    private static final int DB_VERSION = 4;
+
+    // 表名接口定义
+    public interface TABLE {
+        String NOTE = "note";  // 笔记元数据表
+        String DATA = "data"; // 笔记内容数据表
+    }
+
+    // 日志标签
+    private static final String TAG = "NotesDatabaseHelper";
+    
+    // 单例实例（线程安全）
+    private static NotesDatabaseHelper mInstance;
+
+    /******************** 表结构定义SQL语句 ********************/
+    
+    // 创建笔记表的SQL（包含15个字段）
+    private static final String CREATE_NOTE_TABLE_SQL =
+        "CREATE TABLE " + TABLE.NOTE + "(" +
+            NoteColumns.ID + " INTEGER PRIMARY KEY," +                 // 主键
+            NoteColumns.PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +   // 父文件夹ID
+            NoteColumns.ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," +// 提醒时间戳
+            NoteColumns.BG_COLOR_ID + " INTEGER NOT NULL DEFAULT 0," + // 背景色ID
+            NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 创建时间（毫秒）
+            NoteColumns.HAS_ATTACHMENT + " INTEGER NOT NULL DEFAULT 0," + // 是否有附件
+            NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +// 修改时间
+            NoteColumns.NOTES_COUNT + " INTEGER NOT NULL DEFAULT 0," + // 包含笔记数（文件夹用）
+            NoteColumns.SNIPPET + " TEXT NOT NULL DEFAULT ''," +       // 内容摘要
+            NoteColumns.TYPE + " INTEGER NOT NULL DEFAULT 0," +        // 类型（笔记/文件夹/系统）
+            NoteColumns.WIDGET_ID + " INTEGER NOT NULL DEFAULT 0," +   // 关联小部件ID
+            NoteColumns.WIDGET_TYPE + " INTEGER NOT NULL DEFAULT -1," +// 小部件类型
+            NoteColumns.SYNC_ID + " INTEGER NOT NULL DEFAULT 0," +     // 同步ID
+            NoteColumns.LOCAL_MODIFIED + " INTEGER NOT NULL DEFAULT 0," +// 本地修改标记
+            NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +// 原父ID
+            NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''," +      // Google任务ID
+            NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" +      // 数据版本
+        ")";
+
+    // 创建数据表的SQL（包含11个字段）
+    private static final String CREATE_DATA_TABLE_SQL =
+        "CREATE TABLE " + TABLE.DATA + "(" +
+            DataColumns.ID + " INTEGER PRIMARY KEY," +                  // 主键
+            DataColumns.MIME_TYPE + " TEXT NOT NULL," +                // MIME类型
+            DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0," +      // 关联笔记ID
+            NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 创建时间
+            NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +// 修改时间
+            DataColumns.CONTENT + " TEXT NOT NULL DEFAULT ''," +        // 主要内容
+            DataColumns.DATA1 + " INTEGER," +                          // 扩展字段1（整型）
+            DataColumns.DATA2 + " INTEGER," +                          // 扩展字段2（整型）
+            DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," +         // 扩展字段3（文本）
+            DataColumns.DATA4 + " TEXT NOT NULL DEFAULT ''," +         // 扩展字段4（文本）
+            DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" +          // 扩展字段5（文本）
+        ")";
+
+    // 创建数据表note_id索引（提升查询性能）
+    private static final String CREATE_DATA_NOTE_ID_INDEX_SQL =
+        "CREATE INDEX IF NOT EXISTS note_id_index ON " +
+        TABLE.DATA + "(" + DataColumns.NOTE_ID + ");";
+
+    /******************** 触发器定义 ********************/
+    
+    // 更新笔记父文件夹时增加目标文件夹计数
+    private static final String NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =
+        "CREATE TRIGGER increase_folder_count_on_update "+
+        " AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE +
+        " BEGIN " +
+        "  UPDATE " + TABLE.NOTE +
+        "   SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" +
+        "  WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" +
+        " END";
+
+    // 更新笔记父文件夹时减少原文件夹计数
+    private static final String NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =
+        "CREATE TRIGGER decrease_folder_count_on_update " +
+        " AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE +
+        " BEGIN " +
+        "  UPDATE " + TABLE.NOTE +
+        "   SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" +
+        "  WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID +
+        "  AND " + NoteColumns.NOTES_COUNT + ">0" + ";" +
+        " END";
+
+    // 插入新笔记时增加父文件夹计数
+    private static final String NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER =
+        "CREATE TRIGGER increase_folder_count_on_insert " +
+        " AFTER INSERT ON " + TABLE.NOTE +
+        " BEGIN " +
+        "  UPDATE " + TABLE.NOTE +
+        "   SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" +
+        "  WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" +
+        " END";
+
+    // 删除笔记时减少父文件夹计数
+    private static final String NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER =
+        "CREATE TRIGGER decrease_folder_count_on_delete " +
+        " AFTER DELETE ON " + TABLE.NOTE +
+        " BEGIN " +
+        "  UPDATE " + TABLE.NOTE +
+        "   SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" +
+        "  WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID +
+        "  AND " + NoteColumns.NOTES_COUNT + ">0;" +
+        " END";
+
+    // 插入文本数据时更新笔记摘要
+    private static final String DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER =
+        "CREATE TRIGGER update_note_content_on_insert " +
+        " AFTER INSERT ON " + TABLE.DATA +
+        " WHEN new." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
+        " BEGIN" +
+        "  UPDATE " + TABLE.NOTE +
+        "   SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT +
+        "  WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" +
+        " END";
+
+    // 更新文本数据时更新笔记摘要
+    private static final String DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER =
+        "CREATE TRIGGER update_note_content_on_update " +
+        " AFTER UPDATE ON " + TABLE.DATA +
+        " WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
+        " BEGIN" +
+        "  UPDATE " + TABLE.NOTE +
+        "   SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT +
+        "  WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" +
+        " END";
+
+    // 删除文本数据时清空笔记摘要
+    private static final String DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER =
+        "CREATE TRIGGER update_note_content_on_delete " +
+        " AFTER delete ON " + TABLE.DATA +
+        " WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
+        " BEGIN" +
+        "  UPDATE " + TABLE.NOTE +
+        "   SET " + NoteColumns.SNIPPET + "=''" +
+        "  WHERE " + NoteColumns.ID + "=old." + DataColumns.NOTE_ID + ";" +
+        " END";
+
+    // 删除笔记时级联删除关联数据
+    private static final String NOTE_DELETE_DATA_ON_DELETE_TRIGGER =
+        "CREATE TRIGGER delete_data_on_delete " +
+        " AFTER DELETE ON " + TABLE.NOTE +
+        " BEGIN" +
+        "  DELETE FROM " + TABLE.DATA +
+        "   WHERE " + DataColumns.NOTE_ID + "=old." + NoteColumns.ID + ";" +
+        " END";
+
+    // 删除文件夹时级联删除子笔记
+    private static final String FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER =
+        "CREATE TRIGGER folder_delete_notes_on_delete " +
+        " AFTER DELETE ON " + TABLE.NOTE +
+        " BEGIN" +
+        "  DELETE FROM " + TABLE.NOTE +
+        "   WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" +
+        " END";
+
+    // 移动文件夹到回收站时同步移动子笔记
+    private static final String FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER =
+        "CREATE TRIGGER folder_move_notes_on_trash " +
+        " AFTER UPDATE ON " + TABLE.NOTE +
+        " WHEN new." + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER +
+        " BEGIN" +
+        "  UPDATE " + TABLE.NOTE +
+        "   SET " + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER +
+        "  WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" +
+        " END";
+
+    /******************** 构造函数与单例方法 ********************/
+    
+    // 私有构造函数（单例模式）
+    private NotesDatabaseHelper(Context context) {
+        super(context, DB_NAME, null, DB_VERSION);
+    }
+
+    // 获取单例实例（线程安全）
+    static synchronized NotesDatabaseHelper getInstance(Context context) {
+        if (mInstance == null) {
+            mInstance = new NotesDatabaseHelper(context);
+        }
+        return mInstance;
+    }
+
+    /******************** 数据库生命周期方法 ********************/
+    
+    @Override
+    public void onCreate(SQLiteDatabase db) {
+        // 创建笔记表及相关触发器
+        createNoteTable(db);
+        // 创建数据表及相关触发器
+        createDataTable(db);
+    }
+
+    @Override
+    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
+        boolean reCreateTriggers = false; // 是否重建触发器标记
+        boolean skipV2 = false;          // 是否跳过V2升级标记
+
+        // 版本1升级到V2（完全重建表）
+        if (oldVersion == 1) {
+            upgradeToV2(db);
+            skipV2 = true; // 包含V2到V3的升级
+            oldVersion++;
+        }
+
+        // 版本2升级到V3（添加GTASK_ID和回收站）
+        if (oldVersion == 2 && !skipV2) {
+            upgradeToV3(db);
+            reCreateTriggers = true; // 需要重建触发器
+            oldVersion++;
+        }
+
+        // 版本3升级到V4（添加版本字段）
+        if (oldVersion == 3) {
+            upgradeToV4(db);
+            oldVersion++;
+        }
+
+        // 需要时重建触发器
+        if (reCreateTriggers) {
+            reCreateNoteTableTriggers(db);
+            reCreateDataTableTriggers(db);
+        }
+
+        // 版本检查异常处理
+        if (oldVersion != newVersion) {
+            throw new IllegalStateException("数据库升级失败，当前版本：" + oldVersion + "，目标版本：" + newVersion);
+        }
+    }
+
+    /******************** 表创建方法 ********************/
+    
+    // 创建笔记表（含系统文件夹初始化）
+    public void createNoteTable(SQLiteDatabase db) {
+        db.execSQL(CREATE_NOTE_TABLE_SQL);       // 执行建表SQL
+        reCreateNoteTableTriggers(db);           // 重建触发器
+        createSystemFolder(db);                  // 初始化系统文件夹
+        Log.d(TAG, "笔记表已创建");
+    }
+
+    // 重建笔记表触发器（升级时使用）
+    private void reCreateNoteTableTriggers(SQLiteDatabase db) {
+        // 删除旧触发器
+        String[] triggers = {
+            "increase_folder_count_on_update",
+            "decrease_folder_count_on_update",
+            "decrease_folder_count_on_delete",
+            "delete_data_on_delete",
+            "increase_folder_count_on_insert",
+            "folder_delete_notes_on_delete",
+            "folder_move_notes_on_trash"
+        };
+        for (String trigger : triggers) {
+            db.execSQL("DROP TRIGGER IF EXISTS " + trigger);
+        }
+
+        // 重新创建核心触发器
+        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);
+        db.execSQL(NOTE_DELETE_DATA_ON_DELETE_TRIGGER);
+        db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER);
+        db.execSQL(FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER);
+        db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER);
+    }
+
+    // 初始化系统文件夹（根目录/通话记录/临时/回收站）
+    private void createSystemFolder(SQLiteDatabase db) {
+        ContentValues values = new ContentValues();
+
+        // 创建通话记录文件夹
+        values.put(NoteColumns.ID, Notes.ID_CALL_RECORD_FOLDER);
+        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
+        db.insert(TABLE.NOTE, null, values);
+
+        // 创建根文件夹
+        values.clear();
+        values.put(NoteColumns.ID, Notes.ID_ROOT_FOLDER);
+        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
+        db.insert(TABLE.NOTE, null, values);
+
+        // 创建临时文件夹（注意拼写错误TEMPARAY）
+        values.clear();
+        values.put(NoteColumns.ID, Notes.ID_TEMPARAY_FOLDER);
+        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
+        db.insert(TABLE.NOTE, null, values);
+
+        // 创建回收站文件夹（注意拼写错误FOLER）
+        values.clear();
+        values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
+        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
+        db.insert(TABLE.NOTE, null, values);
+    }
+
+    // 创建数据表（含内容更新触发器）
+    public void createDataTable(SQLiteDatabase db) {
+        db.execSQL(CREATE_DATA_TABLE_SQL);      // 执行建表SQL
+        reCreateDataTableTriggers(db);          // 重建触发器
+        db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL); // 创建索引
+        Log.d(TAG, "数据表已创建");
+    }
+
+    // 重建数据表触发器
+    private void reCreateDataTableTriggers(SQLiteDatabase db) {
+        // 删除旧触发器
+        String[] triggers = {
+            "update_note_content_on_insert",
+            "update_note_content_on_update",
+            "update_note_content_on_delete"
+        };
+        for (String trigger : triggers) {
+            db.execSQL("DROP TRIGGER IF EXISTS " + trigger);
+        }
+
+        // 重新创建内容更新触发器
+        db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER);
+        db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER);
+        db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER);
+    }
+
+    /******************** 数据库升级方法 ********************/
+    
+    // 升级到V2版本（完全重建表结构）
+    private void upgradeToV2(SQLiteDatabase db) {
+        db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE);  // 删除旧笔记表
+        db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA);  // 删除旧数据表
+        createNoteTable(db);                              // 重建笔记表
+        createDataTable(db);                               // 重建数据表
+    }
+
+    // 升级到V3版本（添加GTASK_ID和回收站）
+    private void upgradeToV3(SQLiteDatabase db) {
+        // 删除废弃的修改时间触发器
+        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");
+
+        // 添加Google任务ID字段
+        db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID

src/NotesProvider.java

@@ -0,0 +1,281 @@
+/*
+ * 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
+ *
+ *        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;
+
+ // 导入必要的Android类和自定义类
+ import android.app.SearchManager;
+ import android.content.ContentProvider;
+ import android.content.ContentUris;
+ import android.content.ContentValues;
+ import android.content.Intent;
+ import android.content.UriMatcher;
+ import android.database.Cursor;
+ import android.database.sqlite.SQLiteDatabase;
+ import android.net.Uri;
+ import android.text.TextUtils;
+ import android.util.Log;
+ import net.micode.notes.R;
+ import net.micode.notes.data.Notes.DataColumns;
+ import net.micode.notes.data.Notes.NoteColumns;
+ import net.micode.notes.data.NotesDatabaseHelper.TABLE;
+ 
+ // 自定义ContentProvider，用于管理笔记数据的访问
+ public class NotesProvider extends ContentProvider {
+     // URI匹配器，用于解析不同的URI请求
+     private static final UriMatcher mMatcher;
+     // 数据库帮助类实例
+     private NotesDatabaseHelper mHelper;
+     // 日志标签
+     private static final String TAG = "NotesProvider";
+ 
+     // 定义URI匹配的常量
+     private static final int URI_NOTE            = 1; // 整个笔记表
+     private static final int URI_NOTE_ITEM       = 2; // 单个笔记项
+     private static final int URI_DATA            = 3; // 整个数据表
+     private static final int URI_DATA_ITEM       = 4; // 单个数据项
+     private static final int URI_SEARCH          = 5; // 搜索请求
+     private static final int URI_SEARCH_SUGGEST  = 6; // 搜索建议请求
+ 
+     // 静态代码块初始化URI匹配器
+     static {
+         mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
+         mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE); // 匹配"content://authority/note"
+         mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM); // 匹配"content://authority/note/[id]"
+         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);
+     }
+ 
+     // 搜索结果的列投影，用于搜索建议
+     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;
+ 
+     // 搜索查询的SQL语句，过滤回收站和只查普通笔记
+     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;
+ 
+     // ContentProvider创建时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
+     @Override
+     public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
+             String sortOrder) {
+         Cursor c = null;
+         SQLiteDatabase db = mHelper.getReadableDatabase();
+         String id = null;
+         // 根据URI类型执行不同查询
+         switch (mMatcher.match(uri)) {
+             case URI_NOTE: // 查询整个笔记表
+                 c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null, sortOrder);
+                 break;
+             case URI_NOTE_ITEM: // 查询特定ID的笔记
+                 id = uri.getPathSegments().get(1);
+                 c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs, null, null, sortOrder);
+                 break;
+             case URI_DATA: // 查询整个数据表
+                 c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null, sortOrder);
+                 break;
+             case URI_DATA_ITEM: // 查询特定ID的数据
+                 id = uri.getPathSegments().get(1);
+                 c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs, null, null, sortOrder);
+                 break;
+             case URI_SEARCH: // 处理搜索请求
+             case URI_SEARCH_SUGGEST:
+                 if (sortOrder != null || projection != null) {
+                     throw new IllegalArgumentException("参数错误");
+                 }
+                 String searchString = null;
+                 // 获取搜索关键字
+                 if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
+                     if (uri.getPathSegments().size() > 1) {
+                         searchString = uri.getPathSegments().get(1);
+                     }
+                 } else {
+                     searchString = uri.getQueryParameter("pattern");
+                 }
+                 if (TextUtils.isEmpty(searchString)) return null;
+                 try {
+                     searchString = String.format("%%%s%%", searchString); // 构造LIKE参数
+                     c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY, new String[] { searchString });
+                 } catch (IllegalStateException ex) {
+                     Log.e(TAG, "异常: " + ex.toString());
+                 }
+                 break;
+             default:
+                 throw new IllegalArgumentException("未知URI " + uri);
+         }
+         if (c != null) {
+             c.setNotificationUri(getContext().getContentResolver(), uri); // 设置数据变化监听
+         }
+         return c;
+     }
+ 
+     // 处理插入操作
+     @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 {
+                     Log.d(TAG, "数据格式错误: " + values.toString());
+                 }
+                 insertedId = dataId = db.insert(TABLE.DATA, null, values);
+                 break;
+             default:
+                 throw new IllegalArgumentException("未知URI " + uri);
+         }
+         // 通知数据变化
+         if (noteId > 0) {
+             getContext().getContentResolver().notifyChange(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null);
+         }
+         if (dataId > 0) {
+             getContext().getContentResolver().notifyChange(ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null);
+         }
+         return ContentUris.withAppendedId(uri, insertedId); // 返回新插入项的URI
+     }
+ 
+     // 处理删除操作
+     @Override
+     public int delete(Uri uri, String selection, String[] selectionArgs) {
+         int count = 0;
+         String id = null;
+         SQLiteDatabase db = mHelper.getWritableDatabase();
+         boolean deleteData = false;
+         switch (mMatcher.match(uri)) {
+             case URI_NOTE: // 删除笔记（过滤系统文件夹）
+                 selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
+                 count = db.delete(TABLE.NOTE, selection, selectionArgs);
+                 break;
+             case URI_NOTE_ITEM: // 删除特定笔记
+                 id = uri.getPathSegments().get(1);
+                 long noteId = Long.valueOf(id);
+                 if (noteId <= 0) break; // 系统文件夹不删除
+                 count = db.delete(TABLE.NOTE, 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: // 删除特定数据
+                 id = uri.getPathSegments().get(1);
+                 count = db.delete(TABLE.DATA, DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
+                 deleteData = true;
+                 break;
+             default:
+                 throw new IllegalArgumentException("未知URI " + uri);
+         }
+         if (count > 0) {
+             if (deleteData) { // 数据删除需要通知笔记URI更新
+                 getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
+             }
+             getContext().getContentResolver().notifyChange(uri, null); // 通知当前URI变化
+         }
+         return count;
+     }
+ 
+     // 处理更新操作
+     @Override
+     public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
+         int count = 0;
+         String id = null;
+         SQLiteDatabase db = mHelper.getWritableDatabase();
+         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: // 更新特定笔记
+                 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;
+             case URI_DATA_ITEM: // 更新特定数据
+                 id = uri.getPathSegments().get(1);
+                 count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
+                 updateData = true;
+                 break;
+             default:
+                 throw new IllegalArgumentException("未知URI " + uri);
+         }
+         if (count > 0) {
+             if (updateData) { // 数据更新需要通知笔记URI
+                 getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
+             }
+             getContext().getContentResolver().notifyChange(uri, null);
+         }
+         return count;
+     }
+ 
+     // 辅助方法：拼接查询条件
+     private String parseSelection(String selection) {
+         return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
+     }
+ 
+     // 增加笔记版本号（用于同步/冲突检测）
+     private void increaseNoteVersion(long id, String selection, String[] selectionArgs) {
+         StringBuilder sql = new StringBuilder(120);
+         sql.append("UPDATE ").append(TABLE.NOTE)
+            .append(" SET ").append(NoteColumns.VERSION).append("=").append(NoteColumns.VERSION).append("+1 ");
+         if (id > 0 || !TextUtils.isEmpty(selection)) {
+             sql.append(" WHERE ");
+             if (id > 0) {
+                 sql.append(NoteColumns.ID).append("=").append(id);
+             }
+             // 注意：这里直接拼接selection参数可能存在SQL注入风险
+             String selectString = id > 0 ? parseSelection(selection) : selection;
+             if (!TextUtils.isEmpty(selectString)) {
+                 for (String arg : selectionArgs) {
+                     selectString = selectString.replaceFirst("\\?", arg); // 替换占位符
+                 }
+                 sql.append(selectString);
+             }
+         }
+         mHelper.getWritableDatabase().execSQL(sql.toString()); // 执行SQL
+     }
+ 
+     // 未实现的方法（需返回MIME类型）
+     @Override
+     public String getType(Uri uri) {
+         return null;
+     }
+ }