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diff --git a/cjwshiyan/src/data/Contact.java b/cjwshiyan/src/data/Contact.java
new file mode 100644
index 0000000..bd81554
--- /dev/null
+++ b/cjwshiyan/src/data/Contact.java
@@ -0,0 +1,65 @@
+package net.micode.notes.data; // 定义包名
+
+import android.content.Context; // 导入Context类，用于获取应用环境和资源
+import android.database.Cursor; // 导入Cursor类，用于数据库查询结果集的迭代
+import android.provider.ContactsContract.CommonDataKinds.Phone; // 导入Phone类，用于访问联系人电话数据
+import android.provider.ContactsContract.Data; // 导入Data类，用于访问联系人数据
+import android.telephony.PhoneNumberUtils; // 导入PhoneNumberUtils类，用于电话号码操作
+import android.util.Log; // 导入Log类，用于日志输出
+
+import java.util.HashMap; // 导入HashMap类，用于缓存联系人数据
+
+public class Contact { // 定义Contact类，用于处理联系人相关信息
+    private static HashMap<String, String> sContactCache; // 用于缓存联系人姓名的HashMap
+    private static final String TAG = "Contact"; // 日志标签
+
+    // 定义查询联系人的SQL选择语句
+    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 = '+')";
+
+    // 获取联系人姓名的方法
+    public static String getContact(Context context, String phoneNumber) {
+        // 如果缓存为空，则初始化缓存
+        if (sContactCache == null) {
+            sContactCache = new HashMap<String, String>();
+        }
+
+        // 检查缓存中是否已有该电话号码对应的联系人姓名
+        if (sContactCache.containsKey(phoneNumber)) {
+            return sContactCache.get(phoneNumber); // 返回缓存中的联系人姓名
+        }
+
+        // 替换SQL选择语句中的"+"符号为电话号码的最小匹配字符串
+        String selection = CALLER_ID_SELECTION.replace("+",
+                PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));
+
+        // 执行查询，获取联系人姓名
+        Cursor cursor = context.getContentResolver().query(
+                Data.CONTENT_URI, // 联系人数据URI
+                new String[]{Phone.DISPLAY_NAME}, // 查询显示名称列
+                selection, // 查询条件
+                new String[]{phoneNumber}, // 查询参数
+                null // 排序参数
+        );
+
+        // 检查查询结果
+        if (cursor != null && cursor.moveToFirst()) {
+            try {
+                // 从结果集中获取联系人姓名
+                String name = cursor.getString(0);
+                sContactCache.put(phoneNumber, name); // 将姓名存入缓存
+                return name; // 返回联系人姓名
+            } catch (IndexOutOfBoundsException e) {
+                Log.e(TAG, " Cursor get string error " + e.toString()); // 输出错误日志
+                return null; // 返回null表示未找到联系人
+            } finally {
+                cursor.close(); // 关闭游标
+            }
+        } else {
+            Log.d(TAG, "No contact matched with number:" + phoneNumber); // 输出调试日志
+            return null; // 返回null表示未找到联系人
+        }
+    }
+}
diff --git a/cjwshiyan/src/data/Notes.java b/cjwshiyan/src/data/Notes.java
new file mode 100644
index 0000000..820295d
--- /dev/null
+++ b/cjwshiyan/src/data/Notes.java
@@ -0,0 +1,100 @@
+package net.micode.notes.data; // 定义包名
+
+import android.content.ContentUris; // 用于操作URI，如添加ID到URI中
+import android.net.Uri; // 用于表示URI的类
+
+// Notes 类定义了与便签应用相关的常量，包括URI、类型、ID等
+public class Notes {
+    public static final String AUTHORITY = "micode_notes"; // 内容提供者的权限标识
+    public static final String TAG = "Notes"; // 日志标签
+
+    // 定义笔记、文件夹和系统类型的常量
+    public static final int TYPE_NOTE = 0; // 笔记类型
+    public static final int TYPE_FOLDER = 1; // 文件夹类型
+    public static final int TYPE_SYSTEM = 2; // 系统类型
+
+    // 系统文件夹的ID常量
+    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
+    public static final int ID_CALL_RECORD_FOLDER = -2; // 电话记录文件夹ID
+    public static final int ID_TRASH_FOLER = -3; // 垃圾桶文件夹ID
+
+    // 意图（Intent）中使用的额外数据键
+    public static final String INTENT_EXTRA_ALERT_DATE = "net.micode.notes.alert_date"; // 警告日期
+    public static final String INTENT_EXTRA_BACKGROUND_ID = "net.micode.notes.background_color_id"; // 背景颜色ID
+    public static final String INTENT_EXTRA_WIDGET_ID = "net.micode.notes.widget_id"; // 小部件ID
+    public static final String INTENT_EXTRA_WIDGET_TYPE = "net.micode.notes.widget_type"; // 小部件类型
+    public static final String INTENT_EXTRA_FOLDER_ID = "net.micode.notes.folder_id"; // 文件夹ID
+    public static final String INTENT_EXTRA_CALL_DATE = "net.micode.notes.call_date"; // 电话日期
+
+    // 小部件类型的常量
+    public static final int TYPE_WIDGET_INVALIDE = -1; // 无效的小部件类型
+    public static final int TYPE_WIDGET_2X = 0; // 2x2小部件
+    public static final int TYPE_WIDGET_4X = 1; // 4x4小部件
+
+    // 数据常量类，包含笔记和电话记录的MIME类型
+    public static class DataConstants {
+        public static final String NOTE = TextNote.CONTENT_ITEM_TYPE; // 文本笔记MIME类型
+        public static final String CALL_NOTE = CallNote.CONTENT_ITEM_TYPE; // 电话记录MIME类型
+    }
+
+    // 查询所有笔记和文件夹的URI
+    public static final Uri CONTENT_NOTE_URI = Uri.parse("content://" + AUTHORITY + "/note");
+
+    // 查询数据的URI
+    public static final Uri CONTENT_DATA_URI = Uri.parse("content://" + AUTHORITY + "/data");
+
+    // NoteColumns接口定义了笔记相关字段
+    public interface NoteColumns {
+        public static final String ID = "_id"; // 唯一ID
+        public static final String PARENT_ID = "parent_id"; // 父ID，用于文件夹结构
+        public static final String CREATED_DATE = "created_date"; // 创建日期
+        public static final String MODIFIED_DATE = "modified_date"; // 修改日期
+        public static final String ALERTED_DATE = "alert_date"; // 警告日期
+        public static final String SNIPPET = "snippet"; // 文件夹名或笔记内容摘要
+        public static final String WIDGET_ID = "widget_id"; // 小部件ID
+        public static final String WIDGET_TYPE = "widget_type"; // 小部件类型
+        public static final String BG_COLOR_ID = "bg_color_id"; // 背景颜色ID
+        public static final String HAS_ATTACHMENT = "has_attachment"; // 是否有附件
+        public static final String NOTES_COUNT = "notes_count"; // 文件夹中的笔记数量
+        public static final String TYPE = "type"; // 类型（笔记或文件夹）
+        public static final String SYNC_ID = "sync_id"; // 同步ID
+        public static final String LOCAL_MODIFIED = "local_modified"; // 本地修改标志
+        public static final String ORIGIN_PARENT_ID = "origin_parent_id"; // 原始父ID
+        public static final String GTASK_ID = "gtask_id"; // Google任务ID
+        public static final String VERSION = "version"; // 版本号
+    }
+
+    // DataColumns接口定义了数据表相关字段
+    public interface DataColumns {
+        public static final String ID = "_id"; // 唯一ID
+        public static final String MIME_TYPE = "mime_type"; // MIME类型
+        public static final String NOTE_ID = "note_id"; // 对应的笔记ID
+        public static final String CREATED_DATE = "created_date"; // 创建日期
+        public static final String MODIFIED_DATE = "modified_date"; // 修改日期
+        public static final String CONTENT = "content"; // 数据内容
+        public static final String DATA1 = "data1"; // 通用数据列1
+        public static final String DATA2 = "data2"; // 通用数据列2
+        public static final String DATA3 = "data3"; // 通用数据列3
+        public static final String DATA4 = "data4"; // 通用数据列4
+        public static final String DATA5 = "data5"; // 通用数据列5
+    }
+
+    // TextNote类定义了文本笔记相关的常量
+    public static final class TextNote implements DataColumns {
+        public static final String MODE = DATA1; // 模式，检查列表模式或普通模式
+        public static final int MODE_CHECK_LIST = 1; // 检查列表模式值
+        public static final String CONTENT_TYPE = "vnd.android.cursor.dir/text_note"; // 目录MIME类型
+        public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/text_note"; // 项目MIME类型
+        public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/text_note"); // 文本笔记URI
+    }
+
+    // CallNote类定义了电话记录相关的常量
+    public static final class CallNote implements DataColumns {
+        public static final String CALL_DATE = DATA1; // 电话日期
+        public static final String PHONE_NUMBER = DATA3; // 电话号码
+        public static final String CONTENT_TYPE = "vnd.android.cursor.dir/call_note"; // 目录MIME类型
+        public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/call_note"; // 项目MIME类型
+        public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/call_note"); // 电话记录URI
+    }
+}
diff --git a/cjwshiyan/src/data/NotesDatabaseHelper.java b/cjwshiyan/src/data/NotesDatabaseHelper.java
new file mode 100644
index 0000000..5f0c535
--- /dev/null
+++ b/cjwshiyan/src/data/NotesDatabaseHelper.java
@@ -0,0 +1,180 @@
+package net.micode.notes.data; // 定义包名
+
+import android.content.ContentValues; // 用于存储数据的键值对，便于数据库操作
+import android.content.Context; // 用于访问应用环境和资源
+import android.database.sqlite.SQLiteDatabase; // 用于执行SQL语句和进行数据库操作
+import android.database.sqlite.SQLiteOpenHelper; // 管理数据库创建和版本控制的帮助类
+import android.util.Log; // 用于日志输出
+
+import net.micode.notes.data.Notes.DataColumns;
+import net.micode.notes.data.Notes.DataConstants;
+import net.micode.notes.data.Notes.NoteColumns;
+// 导入相关类，用于定义数据库表格的列名和常量
+
+public class NotesDatabaseHelper extends SQLiteOpenHelper {
+    private static final String DB_NAME = "note.db"; // 数据库名称
+    private static final int DB_VERSION = 4; // 数据库版本号
+
+    public interface TABLE {
+        public static final String NOTE = "note"; // 笔记表名称
+        public static final String DATA = "data"; // 数据表名称
+    }
+
+    private static final String TAG = "NotesDatabaseHelper"; // 日志标签
+    private static NotesDatabaseHelper mInstance; // 单例模式中的实例
+
+    // 创建笔记表的SQL语句
+    private static final String CREATE_NOTE_TABLE_SQL = "CREATE TABLE " + TABLE.NOTE + "(" +
+        // 定义各列及其数据类型和约束条件
+    ")";
+
+    // 创建数据表的SQL语句
+    private static final String CREATE_DATA_TABLE_SQL = "CREATE TABLE " + TABLE.DATA + "(" +
+        // 定义各列及其数据类型和约束条件
+    ")";
+
+    // 创建索引以加快根据NOTE_ID查询的速度
+    private static final String CREATE_DATA_NOTE_ID_INDEX_SQL = "CREATE INDEX IF NOT EXISTS note_id_index ON " +
+        TABLE.DATA + "(" + DataColumns.NOTE_ID + ");";
+
+    // 定义触发器，当笔记移动到文件夹时增加文件夹中的笔记计数
+    private static final String NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER = "CREATE TRIGGER increase_folder_count_on_update " +
+        // 触发器定义及逻辑
+    " END";
+
+    // 定义触发器，当笔记从文件夹中移出时减少文件夹中的笔记计数
+    private static final String NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER = "CREATE TRIGGER decrease_folder_count_on_update " +
+        // 触发器定义及逻辑
+    " END";
+
+    // 定义触发器，当向文件夹中插入新笔记时增加文件夹中的笔记计数
+    private static final String NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER = "CREATE TRIGGER increase_folder_count_on_insert " +
+        // 触发器定义及逻辑
+    " END";
+
+    // 定义触发器，当从文件夹中删除笔记时减少文件夹中的笔记计数
+    private static final String NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER = "CREATE TRIGGER decrease_folder_count_on_delete " +
+        // 触发器定义及逻辑
+    " END";
+
+    // 定义触发器，当插入新数据时更新笔记的内容摘要
+    private static final String DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER = "CREATE TRIGGER update_note_content_on_insert " +
+        // 触发器定义及逻辑
+    " END";
+
+    // 定义触发器，当数据更新时更新笔记的内容摘要
+    private static final String DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER = "CREATE TRIGGER update_note_content_on_update " +
+        // 触发器定义及逻辑
+    " END";
+
+    // 定义触发器，当数据删除时清除笔记的内容摘要
+    private static final String DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER = "CREATE TRIGGER update_note_content_on_delete " +
+        // 触发器定义及逻辑
+    " END";
+
+    // 定义触发器，当删除笔记时同时删除相关的数据
+    private static final String NOTE_DELETE_DATA_ON_DELETE_TRIGGER = "CREATE TRIGGER delete_data_on_delete " +
+        // 触发器定义及逻辑
+    " END";
+
+    // 定义触发器，当删除文件夹时同时删除文件夹中的所有笔记
+    private static final String FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER = "CREATE TRIGGER folder_delete_notes_on_delete " +
+        // 触发器定义及逻辑
+    " END";
+
+    // 定义触发器，当文件夹移动到垃圾桶时将文件夹中的所有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 " +
+        // 触发器定义及逻辑
+    " END";
+
+    public NotesDatabaseHelper(Context context) {
+        super(context, DB_NAME, null, DB_VERSION); // 调用父类构造函数
+    }
+
+    public void createNoteTable(SQLiteDatabase db) {
+        db.execSQL(CREATE_NOTE_TABLE_SQL); // 执行创建笔记表的SQL语句
+        reCreateNoteTableTriggers(db); // 重新创建笔记表的触发器
+        createSystemFolder(db); // 创建系统文件夹
+        Log.d(TAG, "note table has been created"); // 输出日志
+    }
+
+    private void reCreateNoteTableTriggers(SQLiteDatabase db) {
+        // 删除旧的触发器
+        db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_update");
+        db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_update");
+        db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_delete");
+        db.execSQL("DROP TRIGGER IF EXISTS delete_data_on_delete");
+        db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_insert");
+        db.execSQL("DROP TRIGGER IF EXISTS folder_delete_notes_on_delete");
+        db.execSQL("DROP TRIGGER IF EXISTS folder_move_notes_on_trash");
+
+        // 创建新的触发器
+        db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
+        db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
+        db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER);
+        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);
+    }
+
+    private void createSystemFolder(SQLiteDatabase db) {
+        ContentValues values = new ContentValues();
+        // 创建系统文件夹
+        values.put(NoteColumns.ID, Notes.ID_CALL_RECORD_FOLDER);
+        values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
+        db.insert(TABLE.NOTE, null, values);
+
+        // 创建其他系统文件夹
+        // ...
+    }
+
+    public void createDataTable(SQLiteDatabase db) {
+        db.execSQL(CREATE_DATA_TABLE_SQL); // 执行创建数据表的SQL语句
+        reCreateDataTableTriggers(db); // 重新创建数据表的触发器
+        db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL); // 创建索引
+        Log.d(TAG, "data table has been created"); // 输出日志
+    }
+
+    private void reCreateDataTableTriggers(SQLiteDatabase db) {
+        // 删除旧的数据表触发器
+        db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_insert");
+        db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_update");
+        db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_delete");
+
+        // 创建新的数据表触发器
+        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);
+    }
+
+    static synchronized NotesDatabaseHelper getInstance(Context context) {
+        if (mInstance == null) {
+            mInstance = new NotesDatabaseHelper(context);
+        }
+        return mInstance;
+    }
+
+    @Override
+    public void onCreate(SQLiteDatabase db) {
+        createNoteTable(db); // 创建笔记表
+        createDataTable(db); // 创建数据表
+    }
+
+    @Override
+    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
+        // 数据库版本升级逻辑
+    }
+
+    private void upgradeToV2(SQLiteDatabase db) {
+        // 升级到版本2的逻辑
+    }
+
+    private void upgradeToV3(SQLiteDatabase db) {
+        // 升级到版本3的逻辑
+    }
+
+    private void upgradeToV4(SQLiteDatabase db) {
+        // 升级到版本4的逻辑
+    }
+}
diff --git a/cjwshiyan/src/data/NotesProvider.java b/cjwshiyan/src/data/NotesProvider.java
new file mode 100644
index 0000000..cf445c0
--- /dev/null
+++ b/cjwshiyan/src/data/NotesProvider.java
@@ -0,0 +1,323 @@
+package net.micode.notes.data; // 定义包名
+import android.app.SearchManager; // 搜索管理器，用于处理搜索建议等
+import android.content.ContentProvider; // Android内容提供者基类
+import android.content.ContentUris; // 用于操作URI，如添加ID到URI中
+import android.content.ContentValues; // 用于存储数据的键值对，便于数据库操作
+import android.content.Intent; // 用于应用程序之间传递数据的意图
+import android.content.UriMatcher; // 用于匹配URI
+import android.database.Cursor; // 用于数据库查询结果集的迭代
+import android.database.sqlite.SQLiteDatabase; // 用于执行SQL语句和进行数据库操作
+import android.net.Uri; // 用于表示URI的类
+import android.text.TextUtils; // 文本操作工具类
+import android.util.Log; // 用于日志输出
+import net.micode.notes.R; // 资源类
+import net.micode.notes.data.Notes.DataColumns; // 数据表列常量
+import net.micode.notes.data.Notes.NoteColumns; // 笔记表列常量
+import net.micode.notes.data.NotesDatabaseHelper.TABLE; // 数据表名称常量
+
+// NotesProvider类继承自ContentProvider，用于提供数据共享接口
+public class NotesProvider extends ContentProvider {
+    // UriMatcher用于匹配URI
+    private static final UriMatcher mMatcher;
+
+    private NotesDatabaseHelper mHelper; // 数据库帮助类实例
+
+    private static final String TAG = "NotesProvider"; // 日志标签
+
+    // 定义匹配URI的常量
+    private static final int URI_NOTE = 1;//用于标识笔记资源
+    private static final int URI_NOTE_ITEM = 2;//用于标识单个笔记资源
+    private static final int URI_DATA = 3;//用于标识数据资源
+    private static final int URI_DATA_ITEM = 4;//用于标识单个数据资源
+    private static final int URI_SEARCH = 5;//搜索功能
+    private static final int URI_SEARCH_SUGGEST = 6;//用于标识搜索功能
+
+    static {
+        // 创建UriMatcher时，调用UriMatcher(UriMatcher.NO_MATCH)表示不匹配任何路径的返回码
+        mMatcher = new UriMatcher(UriMatcher.NO_MATCH);
+        // 把需要匹配URI路径全部给注册上
+        mMatcher.addURI(Notes.AUTHORITY, "note", URI_NOTE);//笔记表
+        mMatcher.addURI(Notes.AUTHORITY, "note/#", URI_NOTE_ITEM);//笔记表中的某条记录
+        mMatcher.addURI(Notes.AUTHORITY, "data", URI_DATA);//数据表
+        mMatcher.addURI(Notes.AUTHORITY, "data/#", URI_DATA_ITEM);//数据表中的某条数据
+        mMatcher.addURI(Notes.AUTHORITY, "search", URI_SEARCH);//搜索
+        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
+    }
+
+    // 声明搜索结果的投影
+    private static final String NOTES_SEARCH_PROJECTION = NoteColumns.ID + ","//笔记ID
+        + NoteColumns.ID + " AS " + SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA + ","//意图数据
+        + "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_1 + ","//笔记摘要
+        + "TRIM(REPLACE(" + NoteColumns.SNIPPET + ", x'0A','')) AS " + SearchManager.SUGGEST_COLUMN_TEXT_2 + ","//
+        + R.drawable.search_result + " AS " + SearchManager.SUGGEST_COLUMN_ICON_1 + ","//搜索结构图标
+        + "'" + Intent.ACTION_VIEW + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_ACTION + ","//意图动作
+        + "'" + Notes.TextNote.CONTENT_TYPE + "' AS " + SearchManager.SUGGEST_COLUMN_INTENT_DATA;//意图数据类型
+
+    // 声明搜索查询
+    private static String NOTES_SNIPPET_SEARCH_QUERY = "SELECT " + NOTES_SEARCH_PROJECTION//查询语句
+        + " FROM " + TABLE.NOTE//表名
+        + " WHERE " + NoteColumns.SNIPPET + " LIKE ?"//查询条件
+        + " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER//排除回收站
+        + " AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE;//笔记类型
+
+    @Override
+    // Context只有在onCreate()中才被初始化，对mHelper进行实例化
+    public boolean onCreate() {
+        mHelper = NotesDatabaseHelper.getInstance(getContext());
+        return true;
+    }
+
+    @Override
+    // 查询uri在数据库中对应的位置
+    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
+            String sortOrder) {
+        Cursor c = null;
+        // 获取可读数据库
+        SQLiteDatabase db = mHelper.getReadableDatabase();
+        String id = null;
+        // 匹配查找uri
+        switch (mMatcher.match(uri)) {
+            // 对于不同的匹配值，在数据库中查找相应的条目
+            case URI_NOTE:
+                c = db.query(TABLE.NOTE, projection, selection, selectionArgs, null, null,
+                        sortOrder);
+                break;
+            case URI_NOTE_ITEM:
+                id = uri.getPathSegments().get(1);
+                c = db.query(TABLE.NOTE, projection, NoteColumns.ID + "=" + id
+                        + parseSelection(selection), selectionArgs, null, null, sortOrder);
+                break;
+            case URI_DATA:
+                c = db.query(TABLE.DATA, projection, selection, selectionArgs, null, null,
+                        sortOrder);
+                break;
+            case URI_DATA_ITEM:
+                id = uri.getPathSegments().get(1);
+                c = db.query(TABLE.DATA, projection, DataColumns.ID + "=" + id
+                        + parseSelection(selection), selectionArgs, null, null, sortOrder);
+                break;
+            case URI_SEARCH:
+            case URI_SEARCH_SUGGEST:
+                if (sortOrder != null || projection != null) {
+                    // 不合法的参数异常
+                    throw new IllegalArgumentException(
+                            "do not specify sortOrder, selection, selectionArgs, or projection" + "with this query");
+                }
+
+                String searchString = null;
+                if (mMatcher.match(uri) == URI_SEARCH_SUGGEST) {
+                    if (uri.getPathSegments().size() > 1) {
+                        // getPathSegments()方法得到一个String的List，
+                        // 在uri.getPathSegments().get(1)为第2个元素
+                        searchString = uri.getPathSegments().get(1);
+                    }
+                } else {
+                    searchString = uri.getQueryParameter("pattern");
+                }
+
+                if (TextUtils.isEmpty(searchString)) {
+                    return null;
+                }
+
+                try {
+                    searchString = String.format("%%%s%%", searchString);
+                    c = db.rawQuery(NOTES_SNIPPET_SEARCH_QUERY,
+                            new String[] { searchString });
+                } catch (IllegalStateException ex) {
+                    Log.e(TAG, "got exception: " + ex.toString());
+                }
+                break;
+            default:
+                // 抛出异常
+                throw new IllegalArgumentException("Unknown URI " + uri);
+        }
+        if (c != null) {
+            c.setNotificationUri(getContext().getContentResolver(), uri);
+        }
+        return c;
+    }
+
+    @Override
+    // 插入一个uri
+    public Uri insert(Uri uri, ContentValues values) {
+        // 获得可写的数据库
+        SQLiteDatabase db = mHelper.getWritableDatabase();
+        long dataId = 0, noteId = 0, insertedId = 0;
+        switch (mMatcher.match(uri)) {
+            // 新增一个条目
+            case URI_NOTE:
+                insertedId = noteId = db.insert(TABLE.NOTE, null, values);
+                break;
+            // 如果存在，查找NOTE_ID
+            case URI_DATA:
+                if (values.containsKey(DataColumns.NOTE_ID)) {
+                    noteId = values.getAsLong(DataColumns.NOTE_ID);
+                } else {
+                    Log.d(TAG, "Wrong data format without note id:" + values.toString());
+                }
+                insertedId = dataId = db.insert(TABLE.DATA, null, values);
+                break;
+           default:
+                throw new IllegalArgumentException("Unknown URI " + uri);
+        }
+        // Notify the note uri
+        // notifyChange获得一个ContextResolver对象并且更新里面的内容
+        if (noteId > 0) {
+            getContext().getContentResolver().notifyChange(
+                    ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), null);
+        }
+
+        // Notify the data uri
+        if (dataId > 0) {
+            getContext().getContentResolver().notifyChange(
+                    ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId), null);
+        }
+
+        // 返回插入的uri的路径
+        return ContentUris.withAppendedId(uri, insertedId);
+    }
+
+    @Override
+    // 删除一个uri
+    public int delete(Uri uri, String selection, String[] selectionArgs) {
+        // Uri代表要操作的数据，Android上可用的每种资源 -包括 图像、视频片段、音频资源等都可以用Uri来表示。
+        int count = 0;
+        String id = null;
+        // 获得可写的数据库
+        SQLiteDatabase db = mHelper.getWritableDatabase();
+        boolean deleteData = false;
+        switch (mMatcher.match(uri)) {
+            case URI_NOTE:
+                selection = "(" + selection + ") AND " + NoteColumns.ID + ">0 ";
+                count = db.delete(TABLE.NOTE, selection, selectionArgs);
+                break;
+            case URI_NOTE_ITEM:
+                id = uri.getPathSegments().get(1);
+                /**
+                 * ID that smaller than 0 is system folder which is not allowed to
+                 * trash
+                 */
+                long noteId = Long.valueOf(id);
+                if (noteId <= 0) {
+                    break;
+                }
+                count = db.delete(TABLE.NOTE,
+                        NoteColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
+                break;
+            case URI_DATA:
+                count = db.delete(TABLE.DATA, selection, selectionArgs);
+                deleteData = true;
+                break;
+            case URI_DATA_ITEM:
+                id = uri.getPathSegments().get(1);
+                count = db.delete(TABLE.DATA,
+                        DataColumns.ID + "=" + id + parseSelection(selection), selectionArgs);
+                deleteData = true;
+                break;
+            default:
+                throw new IllegalArgumentException("Unknown URI " + uri);
+        }
+        if (count > 0) {
+            if (deleteData) {
+                getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
+            }
+            getContext().getContentResolver().notifyChange(uri, null);
+        }
+        return count;
+    }
+
+    @Override
+// 更新一个uri
+public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
+    int count = 0; // 记录更新的行数
+    String id = null; // 用于存储URI中的ID部分
+    SQLiteDatabase db = mHelper.getWritableDatabase(); // 获取可写的数据库实例
+    boolean updateData = false; // 标记是否需要更新数据表
+
+    // 根据URI匹配不同的操作
+    switch (mMatcher.match(uri)) {
+        case URI_NOTE:
+            // 更新笔记表中的多条记录
+            increaseNoteVersion(-1, selection, selectionArgs); // 增加笔记版本号
+            count = db.update(TABLE.NOTE, values, selection, selectionArgs); // 执行更新操作
+            break;
+        case URI_NOTE_ITEM:
+            // 更新笔记表中的单条记录
+            id = uri.getPathSegments().get(1); // 从URI中获取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); // 执行更新操作
+            break;
+        case URI_DATA:
+            // 更新数据表中的多条记录
+            count = db.update(TABLE.DATA, values, selection, selectionArgs); // 执行更新操作
+            updateData = true; // 设置更新数据表的标记为true
+            break;
+        case URI_DATA_ITEM:
+            // 更新数据表中的单条记录
+            id = uri.getPathSegments().get(1); // 从URI中获取ID
+            count = db.update(TABLE.DATA, values, DataColumns.ID + "=" + id
+                    + parseSelection(selection), selectionArgs); // 执行更新操作
+            updateData = true; // 设置更新数据表的标记为true
+            break;
+        default:
+            // 如果URI不匹配任何已知类型，则抛出异常
+            throw new IllegalArgumentException("Unknown URI " + uri);
+    }
+
+    // 如果有行被更新，则通知相关URI的监听器
+    if (count > 0) {
+        if (updateData) {
+            // 如果更新了数据表，则通知笔记表的URI
+            getContext().getContentResolver().notifyChange(Notes.CONTENT_NOTE_URI, null);
+        }
+        // 通知当前URI的监听器
+        getContext().getContentResolver().notifyChange(uri, null);
+    }
+    return count; // 返回更新的行数
+}
+
+/// 将字符串解析成规定格式
+private String parseSelection(String selection) {
+    // 如果传入的选择字符串不为空，则在 selection 前后添加 " AND (" 和 ")"，否则返回空字符串
+    return (!TextUtils.isEmpty(selection) ? " AND (" + selection + ')' : "");
+}
+
+// 增加一个noteVersion
+private void increaseNoteVersion(long id, String selection, String[] selectionArgs) {
+    // 创建StringBuilder对象，用于构建SQL语句
+    StringBuilder sql = new StringBuilder(120);
+    sql.append("UPDATE "); // 添加UPDATE关键字
+    sql.append(TABLE.NOTE); // 添加表名NOTE
+    sql.append(" SET "); // 添加SET关键字
+    sql.append(NoteColumns.VERSION); // 添加版本号列名
+    sql.append("=" + NoteColumns.VERSION + "+1 "); // 版本号列值加1
+
+    // 如果ID大于0或者选择字符串不为空，则添加WHERE关键字
+    if (id > 0 || !TextUtils.isEmpty(selection)) {
+        sql.append(" WHERE ");
+    }
+    // 如果ID大于0，则添加ID等于指定值的条件
+    if (id > 0) {
+        sql.append(NoteColumns.ID + "=" + String.valueOf(id));
+    }
+    // 如果选择字符串不为空，则添加解析后的选择字符串作为条件
+    if (!TextUtils.isEmpty(selection)) {
+        String selectString = id > 0 ? parseSelection(selection) : selection;
+        // 将选择字符串中的占位符替换为实际的参数值
+        for (String args : selectionArgs) {
+            selectString = selectString.replaceFirst("\\?", args);
+        }
+        sql.append(selectString);
+    }
+
+    // 使用execSQL方法执行构建的SQL语句
+    mHelper.getWritableDatabase().execSQL(sql.toString());
+}
+
+@Override
+public String getType(Uri uri) {
+    // TODO: 需要实现该方法来返回给定URI的MIME类型，暂时返回null
+    return null;
+}
diff --git a/cjwshiyan/src/widget/NoteWidgetProvider.java b/cjwshiyan/src/widget/NoteWidgetProvider.java
new file mode 100644
index 0000000..f21ab85
--- /dev/null
+++ b/cjwshiyan/src/widget/NoteWidgetProvider.java
@@ -0,0 +1,151 @@
+package net.micode.notes.widget;
+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;
+
+public abstract class NoteWidgetProvider extends AppWidgetProvider {
+    // 定义查询投影，包括ID、背景颜色ID和片段
+    public static final String [] PROJECTION = new String [] {
+            NoteColumns.ID,
+            NoteColumns.BG_COLOR_ID,
+            NoteColumns.SNIPPET
+    };
+
+    // 定义投影中各列的索引
+    public static final int COLUMN_ID           = 0;
+    public static final int COLUMN_BG_COLOR_ID  = 1;
+    public static final int COLUMN_SNIPPET      = 2;
+
+    // 定义日志标签
+    private static final String TAG = "NoteWidgetProvider";
+
+    // 当小部件被删除时调用
+    @Override
+    public void onDeleted(Context context, int[] appWidgetIds) {
+        // 创建ContentValues对象，用于更新小部件ID
+        ContentValues values = new ContentValues();
+        values.put(NoteColumns.WIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID);
+        // 遍历所有被删除的小部件ID
+        for (int i = 0; i < appWidgetIds.length; i++) {
+            // 更新数据库中对应的小部件ID为无效ID
+            context.getContentResolver().update(Notes.CONTENT_NOTE_URI,
+                    values,
+                    NoteColumns.WIDGET_ID + "=?",
+                    new String[] { String.valueOf(appWidgetIds[i])});
+        }
+    }
+
+    // 获取小部件信息
+    private Cursor getNoteWidgetInfo(Context context, int widgetId) {
+        // 查询数据库，获取指定小部件ID的信息
+        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
+    protected void update(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
+        // 调用重载方法，默认不处于隐私模式
+        update(context, appWidgetManager, appWidgetIds, false);
+    }
+
+    // 更新小部件，可以指定是否处于隐私模式
+    private void update(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds,
+                        boolean privacyMode) {
+        // 遍历所有小部件ID
+        for (int i = 0; i < appWidgetIds.length; i++) {
+            // 如果小部件ID有效
+            if (appWidgetIds[i] != AppWidgetManager.INVALID_APPWIDGET_ID) {
+                // 获取默认背景ID
+                int bgId = ResourceParser.getDefaultBgId(context);
+                // 初始化片段为空字符串
+                String snippet = "";
+                // 创建启动NoteEditActivity的Intent
+                Intent intent = new Intent(context, NoteEditActivity.class);
+                intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
+                intent.putExtra(Notes.INTENT_EXTRA_WIDGET_ID, appWidgetIds[i]);
+                intent.putExtra(Notes.INTENT_EXTRA_WIDGET_TYPE, getWidgetType());
+
+                // 查询小部件信息
+                Cursor c = getNoteWidgetInfo(context, appWidgetIds[i]);
+                if (c != null && c.moveToFirst()) {
+                    // 如果查询结果有多个记录，记录错误日志
+                    if (c.getCount() > 1) {
+                        Log.e(TAG, "Multiple message with same widget id:" + appWidgetIds[i]);
+                        c.close();
+                        return;
+                    }
+                    // 获取片段和背景ID
+                    snippet = c.getString(COLUMN_SNIPPET);
+                    bgId = c.getInt(COLUMN_BG_COLOR_ID);
+                    // 设置Intent的UID
+                    intent.putExtra(Intent.EXTRA_UID, c.getLong(COLUMN_ID));
+                    intent.setAction(Intent.ACTION_VIEW);
+                } else {
+                    // 如果没有查询到记录，设置默认片段
+                    snippet = context.getResources().getString(R.string.widget_havenot_content);
+                    intent.setAction(Intent.ACTION_INSERT_OR_EDIT);
+                }
+
+                // 关闭Cursor
+                if (c != null) {
+                    c.close();
+                }
+
+                // 创建RemoteViews对象，用于更新小部件UI
+                RemoteViews rv = new RemoteViews(context.getPackageName(), getLayoutId());
+                // 设置背景图片
+                rv.setImageViewResource(R.id.widget_bg_image, getBgResourceId(bgId));
+                intent.putExtra(Notes.INTENT_EXTRA_BACKGROUND_ID, bgId);
+                /**
+                 * 生成启动小部件的PendingIntent
+                 */
+                PendingIntent pendingIntent = null;
+                // 如果处于隐私模式
+                if (privacyMode) {
+                    // 设置文本为隐私模式提示
+                    rv.setTextViewText(R.id.widget_text,
+                            context.getString(R.string.widget_under_visit_mode));
+                    // 创建启动NotesListActivity的PendingIntent
+                    pendingIntent = PendingIntent.getActivity(context, appWidgetIds[i], new Intent(
+                            context, NotesListActivity.class), PendingIntent.FLAG_UPDATE_CURRENT);
+                } else {
+                    // 设置文本为片段内容
+                    rv.setTextViewText(R.id.widget_text, snippet);
+                    // 创建启动NoteEditActivity的PendingIntent
+                    pendingIntent = PendingIntent.getActivity(context, appWidgetIds[i], intent,
+                            PendingIntent.FLAG_UPDATE_CURRENT);
+                }
+
+                // 设置点击事件
+                rv.setOnClickPendingIntent(R.id.widget_text, pendingIntent);
+                // 更新小部件
+                appWidgetManager.updateAppWidget(appWidgetIds[i], rv);
+            }
+        }
+    }
+
+    // 获取背景资源ID
+    protected abstract int getBgResourceId(int bgId);
+
+    // 获取布局ID
+    protected abstract int getLayoutId();
+
+    // 获取小部件类型
+    protected abstract int getWidgetType();
+}
\ No newline at end of file
diff --git a/cjwshiyan/src/widget/NoteWidgetProvider_2x.java b/cjwshiyan/src/widget/NoteWidgetProvider_2x.java
new file mode 100644
index 0000000..17c7ceb
--- /dev/null
+++ b/cjwshiyan/src/widget/NoteWidgetProvider_2x.java
@@ -0,0 +1,46 @@
+/*
+ * 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;
+public class NoteWidgetProvider_2x extends NoteWidgetProvider {
+    // 当小部件更新时调用
+    @Override
+    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
+        // 调用父类的update方法
+        super.update(context, appWidgetManager, appWidgetIds);
+    }
+    // 获取小部件布局ID
+    @Override
+    protected int getLayoutId() {
+        return R.layout.widget_2x;
+    }
+    // 获取小部件背景资源ID
+    @Override
+    protected int getBgResourceId(int bgId) {
+        // 调用ResourceParser获取2x小部件的背景资源ID
+        return ResourceParser.WidgetBgResources.getWidget2xBgResource(bgId);
+    }
+    // 获取小部件类型
+    @Override
+    protected int getWidgetType() {
+        // 返回2x小部件的类型
+        return Notes.TYPE_WIDGET_2X;
+    }
+}
\ No newline at end of file
diff --git a/cjwshiyan/src/widget/NoteWidgetProvider_4x.java b/cjwshiyan/src/widget/NoteWidgetProvider_4x.java
new file mode 100644
index 0000000..7bd10a0
--- /dev/null
+++ b/cjwshiyan/src/widget/NoteWidgetProvider_4x.java
@@ -0,0 +1,57 @@
+/*
+ * 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.
+ */
+Java
+
+
+
+
+        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;
+
+
+public class NoteWidgetProvider_4x extends NoteWidgetProvider {
+    // 当小部件更新时调用
+    @Override
+    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
+        // 调用父类的update方法
+        super.update(context, appWidgetManager, appWidgetIds);
+    }
+
+    // 获取小部件布局ID
+    protected int getLayoutId() {
+        return R.layout.widget_4x;
+    }
+
+    // 获取小部件背景资源ID
+    @Override
+    protected int getBgResourceId(int bgId) {
+        // 调用ResourceParser获取4x小部件的背景资源ID
+        return ResourceParser.WidgetBgResources.getWidget4xBgResource(bgId);
+    }
+
+    // 获取小部件类型
+    @Override
+    protected int getWidgetType() {
+        // 返回4x小部件的类型
+        return Notes.TYPE_WIDGET_4X;
+    }
+}