1

src/tools/BackupUtils.java

@@ -0,0 +1,388 @@
+/*
+ * 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.tool;
+
+import android.content.Context;
+import android.database.Cursor;
+import android.os.Environment;
+import android.text.TextUtils;
+import android.text.format.DateFormat;
+import android.util.Log;
+
+import net.micode.notes.R;
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.DataColumns;
+import net.micode.notes.data.Notes.DataConstants;
+import net.micode.notes.data.Notes.NoteColumns;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.PrintStream;
+
+
+/**
+ * BackupUtils类用于将笔记数据备份到外部存储的文本文件中。
+ * 它支持导出普通笔记和通话记录笔记，并按照文件夹结构组织备份内容。
+ * 该类使用单例模式确保全局只有一个实例。
+ */
+public class BackupUtils {
+    private static final String TAG = "BackupUtils";
+    // 单例模式实现
+    private static BackupUtils sInstance;
+
+    /**
+     * 获取BackupUtils的单例实例
+     * @param context 应用上下文
+     * @return BackupUtils的单例实例
+     */
+    public static synchronized BackupUtils getInstance(Context context) {
+        if (sInstance == null) {
+            sInstance = new BackupUtils(context);
+        }
+        return sInstance;
+    }
+
+    /**
+     * 备份或恢复操作的状态码
+     */
+    // 当前SD卡未挂载
+    public static final int STATE_SD_CARD_UNMOUONTED           = 0;
+    // 备份文件不存在
+    public static final int STATE_BACKUP_FILE_NOT_EXIST        = 1;
+    // 数据格式损坏，可能被其他程序修改
+    public static final int STATE_DATA_DESTROIED               = 2;
+    // 运行时异常导致备份或恢复失败
+    public static final int STATE_SYSTEM_ERROR                 = 3;
+    // 备份或恢复成功
+    public static final int STATE_SUCCESS                      = 4;
+
+    private TextExport mTextExport;
+
+    private BackupUtils(Context context) {
+        mTextExport = new TextExport(context);
+    }
+
+    /**
+     * 检查外部存储是否可用
+     * @return 如果外部存储已挂载则返回true，否则返回false
+     */
+    private static boolean externalStorageAvailable() {
+        return Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState());
+    }
+
+    /**
+     * 执行笔记导出为文本文件的操作
+     * @return 导出操作的状态码
+     */
+    public int exportToText() {
+        return mTextExport.exportToText();
+    }
+
+    /**
+     * 获取导出的文本文件的文件名
+     * @return 导出文件的名称
+     */
+    public String getExportedTextFileName() {
+        return mTextExport.mFileName;
+    }
+
+    /**
+     * 获取导出的文本文件的目录路径
+     * @return 导出文件所在的目录路径
+     */
+    public String getExportedTextFileDir() {
+        return mTextExport.mFileDirectory;
+    }
+
+    /**
+     * 内部类，负责将笔记导出为文本格式
+     */
+    private static class TextExport {
+        // 查询笔记时使用的投影，指定要查询的列
+        private static final String[] NOTE_PROJECTION = {
+                NoteColumns.ID,
+                NoteColumns.MODIFIED_DATE,
+                NoteColumns.SNIPPET,
+                NoteColumns.TYPE
+        };
+
+        // 笔记查询结果中各列的索引
+        private static final int NOTE_COLUMN_ID = 0;
+        private static final int NOTE_COLUMN_MODIFIED_DATE = 1;
+        private static final int NOTE_COLUMN_SNIPPET = 2;
+
+        // 查询笔记数据时使用的投影
+        private static final String[] DATA_PROJECTION = {
+                DataColumns.CONTENT,
+                DataColumns.MIME_TYPE,
+                DataColumns.DATA1,
+                DataColumns.DATA2,
+                DataColumns.DATA3,
+                DataColumns.DATA4,
+        };
+
+        // 数据查询结果中各列的索引
+        private static final int DATA_COLUMN_CONTENT = 0;
+        private static final int DATA_COLUMN_MIME_TYPE = 1;
+        private static final int DATA_COLUMN_CALL_DATE = 2;
+        private static final int DATA_COLUMN_PHONE_NUMBER = 4;
+
+        // 导出文本的格式数组，从资源文件中获取
+        private final String [] TEXT_FORMAT;
+        private static final int FORMAT_FOLDER_NAME          = 0;
+        private static final int FORMAT_NOTE_DATE            = 1;
+        private static final int FORMAT_NOTE_CONTENT         = 2;
+
+        private Context mContext;
+        private String mFileName;
+        private String mFileDirectory;
+
+        public TextExport(Context context) {
+            TEXT_FORMAT = context.getResources().getStringArray(R.array.format_for_exported_note);
+            mContext = context;
+            mFileName = "";
+            mFileDirectory = "";
+        }
+
+        /**
+         * 获取指定索引的文本格式字符串
+         * @param id 格式字符串的索引
+         * @return 对应的格式字符串
+         */
+        private String getFormat(int id) {
+            return TEXT_FORMAT[id];
+        }
+
+        /**
+         * 将指定文件夹中的所有笔记导出为文本
+         * @param folderId 文件夹ID
+         * @param ps 输出流
+         */
+        private void exportFolderToText(String folderId, PrintStream ps) {
+            // 查询属于该文件夹的所有笔记
+            Cursor notesCursor = mContext.getContentResolver().query(Notes.CONTENT_NOTE_URI,
+                    NOTE_PROJECTION, NoteColumns.PARENT_ID + "=?", new String[] {
+                        folderId
+                    }, null);
+
+            if (notesCursor != null) {
+                if (notesCursor.moveToFirst()) {
+                    do {
+                        // 打印笔记的最后修改日期
+                        ps.println(String.format(getFormat(FORMAT_NOTE_DATE), DateFormat.format(
+                                mContext.getString(R.string.format_datetime_mdhm),
+                                notesCursor.getLong(NOTE_COLUMN_MODIFIED_DATE))));
+                        // 查询属于该笔记的数据并导出
+                        String noteId = notesCursor.getString(NOTE_COLUMN_ID);
+                        exportNoteToText(noteId, ps);
+                    } while (notesCursor.moveToNext());
+                }
+                notesCursor.close();
+            }
+        }
+
+        /**
+         * 将指定ID的笔记导出到输出流
+         * @param noteId 笔记ID
+         * @param ps 输出流
+         */
+        private void exportNoteToText(String noteId, PrintStream ps) {
+            // 查询属于该笔记的所有数据项
+            Cursor dataCursor = mContext.getContentResolver().query(Notes.CONTENT_DATA_URI,
+                    DATA_PROJECTION, DataColumns.NOTE_ID + "=?", new String[] {
+                        noteId
+                    }, null);
+
+            if (dataCursor != null) {
+                if (dataCursor.moveToFirst()) {
+                    do {
+                        String mimeType = dataCursor.getString(DATA_COLUMN_MIME_TYPE);
+                        if (DataConstants.CALL_NOTE.equals(mimeType)) {
+                            // 处理通话记录笔记
+                            String phoneNumber = dataCursor.getString(DATA_COLUMN_PHONE_NUMBER);
+                            long callDate = dataCursor.getLong(DATA_COLUMN_CALL_DATE);
+                            String location = dataCursor.getString(DATA_COLUMN_CONTENT);
+
+                            if (!TextUtils.isEmpty(phoneNumber)) {
+                                ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT),
+                                        phoneNumber));
+                            }
+                            // 打印通话日期
+                            ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT), DateFormat
+                                    .format(mContext.getString(R.string.format_datetime_mdhm),
+                                            callDate)));
+                            // 打印通话附件位置
+                            if (!TextUtils.isEmpty(location)) {
+                                ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT),
+                                        location));
+                            }
+                        } else if (DataConstants.NOTE.equals(mimeType)) {
+                            // 处理普通笔记
+                            String content = dataCursor.getString(DATA_COLUMN_CONTENT);
+                            if (!TextUtils.isEmpty(content)) {
+                                ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT),
+                                        content));
+                            }
+                        }
+                    } while (dataCursor.moveToNext());
+                }
+                dataCursor.close();
+            }
+            // 在笔记之间打印分隔符
+            try {
+                ps.write(new byte[] {
+                        Character.LINE_SEPARATOR, Character.LETTER_NUMBER
+                });
+            } catch (IOException e) {
+                Log.e(TAG, e.toString());
+            }
+        }
+
+        /**
+         * 将所有笔记导出为用户可读的文本格式
+         * @return 导出操作的状态码
+         */
+        public int exportToText() {
+            if (!externalStorageAvailable()) {
+                Log.d(TAG, "Media was not mounted");
+                return STATE_SD_CARD_UNMOUONTED;
+            }
+
+            PrintStream ps = getExportToTextPrintStream();
+            if (ps == null) {
+                Log.e(TAG, "get print stream error");
+                return STATE_SYSTEM_ERROR;
+            }
+            
+            // 首先导出文件夹及其包含的笔记
+            Cursor folderCursor = mContext.getContentResolver().query(
+                    Notes.CONTENT_NOTE_URI,
+                    NOTE_PROJECTION,
+                    "(" + NoteColumns.TYPE + "=" + Notes.TYPE_FOLDER + " AND "
+                            + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER + ") OR "
+                            + NoteColumns.ID + "=" + Notes.ID_CALL_RECORD_FOLDER, null, null);
+
+            if (folderCursor != null) {
+                if (folderCursor.moveToFirst()) {
+                    do {
+                        // 打印文件夹名称
+                        String folderName = "";
+                        if(folderCursor.getLong(NOTE_COLUMN_ID) == Notes.ID_CALL_RECORD_FOLDER) {
+                            folderName = mContext.getString(R.string.call_record_folder_name);
+                        } else {
+                            folderName = folderCursor.getString(NOTE_COLUMN_SNIPPET);
+                        }
+                        if (!TextUtils.isEmpty(folderName)) {
+                            ps.println(String.format(getFormat(FORMAT_FOLDER_NAME), folderName));
+                        }
+                        String folderId = folderCursor.getString(NOTE_COLUMN_ID);
+                        exportFolderToText(folderId, ps);
+                    } while (folderCursor.moveToNext());
+                }
+                folderCursor.close();
+            }
+
+            // 导出根文件夹中的笔记
+            Cursor noteCursor = mContext.getContentResolver().query(
+                    Notes.CONTENT_NOTE_URI,
+                    NOTE_PROJECTION,
+                    NoteColumns.TYPE + "=" + +Notes.TYPE_NOTE + " AND " + NoteColumns.PARENT_ID
+                            + "=0", null, null);
+
+            if (noteCursor != null) {
+                if (noteCursor.moveToFirst()) {
+                    do {
+                        ps.println(String.format(getFormat(FORMAT_NOTE_DATE), DateFormat.format(
+                                mContext.getString(R.string.format_datetime_mdhm),
+                                noteCursor.getLong(NOTE_COLUMN_MODIFIED_DATE))));
+                        // 查询属于该笔记的数据并导出
+                        String noteId = noteCursor.getString(NOTE_COLUMN_ID);
+                        exportNoteToText(noteId, ps);
+                    } while (noteCursor.moveToNext());
+                }
+                noteCursor.close();
+            }
+            ps.close();
+
+            return STATE_SUCCESS;
+        }
+
+        /**
+         * 获取指向导出文本文件的打印流
+         * @return 打印流对象，如果出错则返回null
+         */
+        private PrintStream getExportToTextPrintStream() {
+            File file = generateFileMountedOnSDcard(mContext, R.string.file_path,
+                    R.string.file_name_txt_format);
+            if (file == null) {
+                Log.e(TAG, "create file to exported failed");
+                return null;
+            }
+            mFileName = file.getName();
+            mFileDirectory = mContext.getString(R.string.file_path);
+            PrintStream ps = null;
+            try {
+                FileOutputStream fos = new FileOutputStream(file);
+                ps = new PrintStream(fos);
+            } catch (FileNotFoundException e) {
+                e.printStackTrace();
+                return null;
+            } catch (NullPointerException e) {
+                e.printStackTrace();
+                return null;
+            }
+            return ps;
+        }
+    }
+
+    /**
+     * 在外部存储上生成用于存储备份数据的文件
+     * @param context 应用上下文
+     * @param filePathResId 文件路径的资源ID
+     * @param fileNameFormatResId 文件名格式的资源ID
+     * @return 生成的文件对象，如果出错则返回null
+     */
+    private static File generateFileMountedOnSDcard(Context context, int filePathResId, int fileNameFormatResId) {
+        StringBuilder sb = new StringBuilder();
+        sb.append(Environment.getExternalStorageDirectory());
+        sb.append(context.getString(filePathResId));
+        File filedir = new File(sb.toString());
+        sb.append(context.getString(
+                fileNameFormatResId,
+                DateFormat.format(context.getString(R.string.format_date_ymd),
+                        System.currentTimeMillis())));
+        File file = new File(sb.toString());
+
+        try {
+            if (!filedir.exists()) {
+                filedir.mkdir();
+            }
+            if (!file.exists()) {
+                file.createNewFile();
+            }
+            return file;
+        } catch (SecurityException e) {
+            e.printStackTrace();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+        return null;
+    }
+}

src/tools/DataUtils.java

@@ -0,0 +1,378 @@
+/*
+ * 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.tool;
+
+import android.content.ContentProviderOperation;
+import android.content.ContentProviderResult;
+import android.content.ContentResolver;
+import android.content.ContentUris;
+import android.content.ContentValues;
+import android.content.OperationApplicationException;
+import android.database.Cursor;
+import android.os.RemoteException;
+import android.util.Log;
+
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.CallNote;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.ui.NotesListAdapter.AppWidgetAttribute;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+
+
+/**
+ * DataUtils类提供了一系列用于操作笔记数据的工具方法。
+ * 这些方法主要通过ContentResolver与内容提供者交互，实现对笔记的增删改查等操作。
+ */
+public class DataUtils {
+    public static final String TAG = "DataUtils";
+    
+    /**
+     * 批量删除笔记
+     * @param resolver ContentResolver对象，用于与内容提供者通信
+     * @param ids 要删除的笔记ID集合
+     * @return 删除成功返回true，失败返回false
+     */
+    public static boolean batchDeleteNotes(ContentResolver resolver, HashSet<Long> ids) {
+        if (ids == null) {
+            Log.d(TAG, "the ids is null");
+            return true;
+        }
+        if (ids.size() == 0) {
+            Log.d(TAG, "no id is in the hashset");
+            return true;
+        }
+
+        ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>();
+        for (long id : ids) {
+            if(id == Notes.ID_ROOT_FOLDER) {
+                Log.e(TAG, "Don't delete system folder root");
+                continue;
+            }
+            ContentProviderOperation.Builder builder = ContentProviderOperation
+                    .newDelete(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id));
+            operationList.add(builder.build());
+        }
+        try {
+            ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList);
+            if (results == null || results.length == 0 || results[0] == null) {
+                Log.d(TAG, "delete notes failed, ids:" + ids.toString());
+                return false;
+            }
+            return true;
+        } catch (RemoteException e) {
+            Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+        } catch (OperationApplicationException e) {
+            Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+        }
+        return false;
+    }
+
+    /**
+     * 将笔记从一个文件夹移动到另一个文件夹
+     * @param resolver ContentResolver对象
+     * @param id 要移动的笔记ID
+     * @param srcFolderId 源文件夹ID
+     * @param desFolderId 目标文件夹ID
+     */
+    public static void moveNoteToFoler(ContentResolver resolver, long id, long srcFolderId, long desFolderId) {
+        ContentValues values = new ContentValues();
+        values.put(NoteColumns.PARENT_ID, desFolderId);
+        values.put(NoteColumns.ORIGIN_PARENT_ID, srcFolderId);
+        values.put(NoteColumns.LOCAL_MODIFIED, 1);
+        resolver.update(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id), values, null, null);
+    }
+
+    /**
+     * 批量将笔记移动到指定文件夹
+     * @param resolver ContentResolver对象
+     * @param ids 要移动的笔记ID集合
+     * @param folderId 目标文件夹ID
+     * @return 移动成功返回true，失败返回false
+     */
+    public static boolean batchMoveToFolder(ContentResolver resolver, HashSet<Long> ids,
+            long folderId) {
+        if (ids == null) {
+            Log.d(TAG, "the ids is null");
+            return true;
+        }
+
+        ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>();
+        for (long id : ids) {
+            ContentProviderOperation.Builder builder = ContentProviderOperation
+                    .newUpdate(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id));
+            builder.withValue(NoteColumns.PARENT_ID, folderId);
+            builder.withValue(NoteColumns.LOCAL_MODIFIED, 1);
+            operationList.add(builder.build());
+        }
+
+        try {
+            ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList);
+            if (results == null || results.length == 0 || results[0] == null) {
+                Log.d(TAG, "delete notes failed, ids:" + ids.toString());
+                return false;
+            }
+            return true;
+        } catch (RemoteException e) {
+            Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+        } catch (OperationApplicationException e) {
+            Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
+        }
+        return false;
+    }
+
+    /**
+     * 获取用户创建的文件夹数量（不包括系统文件夹）
+     * @param resolver ContentResolver对象
+     * @return 用户文件夹的数量
+     */
+    public static int getUserFolderCount(ContentResolver resolver) {
+        Cursor cursor =resolver.query(Notes.CONTENT_NOTE_URI,
+                new String[] { "COUNT(*)" },
+                NoteColumns.TYPE + "=? AND " + NoteColumns.PARENT_ID + "<>?",
+                new String[] { String.valueOf(Notes.TYPE_FOLDER), String.valueOf(Notes.ID_TRASH_FOLER)},
+                null);
+
+        int count = 0;
+        if(cursor != null) {
+            if(cursor.moveToFirst()) {
+                try {
+                    count = cursor.getInt(0);
+                } catch (IndexOutOfBoundsException e) {
+                    Log.e(TAG, "get folder count failed:" + e.toString());
+                } finally {
+                    cursor.close();
+                }
+            }
+        }
+        return count;
+    }
+
+    /**
+     * 检查笔记是否在数据库中可见（存在且不在回收站）
+     * @param resolver ContentResolver对象
+     * @param noteId 笔记ID
+     * @param type 笔记类型
+     * @return 如果笔记存在且可见返回true，否则返回false
+     */
+    public static boolean visibleInNoteDatabase(ContentResolver resolver, long noteId, int type) {
+        Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId),
+                null,
+                NoteColumns.TYPE + "=? AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER,
+                new String [] {String.valueOf(type)},
+                null);
+
+        boolean exist = false;
+        if (cursor != null) {
+            if (cursor.getCount() > 0) {
+                exist = true;
+            }
+            cursor.close();
+        }
+        return exist;
+    }
+
+    /**
+     * 检查笔记是否存在于数据库中
+     * @param resolver ContentResolver对象
+     * @param noteId 笔记ID
+     * @return 如果笔记存在返回true，否则返回false
+     */
+    public static boolean existInNoteDatabase(ContentResolver resolver, long noteId) {
+        Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId),
+                null, null, null, null);
+
+        boolean exist = false;
+        if (cursor != null) {
+            if (cursor.getCount() > 0) {
+                exist = true;
+            }
+            cursor.close();
+        }
+        return exist;
+    }
+
+    /**
+     * 检查数据项是否存在于数据库中
+     * @param resolver ContentResolver对象
+     * @param dataId 数据项ID
+     * @return 如果数据项存在返回true，否则返回false
+     */
+    public static boolean existInDataDatabase(ContentResolver resolver, long dataId) {
+        Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId),
+                null, null, null, null);
+
+        boolean exist = false;
+        if (cursor != null) {
+            if (cursor.getCount() > 0) {
+                exist = true;
+            }
+            cursor.close();
+        }
+        return exist;
+    }
+
+    /**
+     * 检查可见文件夹中是否存在指定名称的文件夹
+     * @param resolver ContentResolver对象
+     * @param name 文件夹名称
+     * @return 如果存在返回true，否则返回false
+     */
+    public static boolean checkVisibleFolderName(ContentResolver resolver, String name) {
+        Cursor cursor = resolver.query(Notes.CONTENT_NOTE_URI, null,
+                NoteColumns.TYPE + "=" + Notes.TYPE_FOLDER +
+                " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER +
+                " AND " + NoteColumns.SNIPPET + "=?",
+                new String[] { name }, null);
+        boolean exist = false;
+        if(cursor != null) {
+            if(cursor.getCount() > 0) {
+                exist = true;
+            }
+            cursor.close();
+        }
+        return exist;
+    }
+
+    /**
+     * 获取指定文件夹下的所有便签小部件属性
+     * @param resolver ContentResolver对象
+     * @param folderId 文件夹ID
+     * @return 包含AppWidgetAttribute的HashSet，如果没有则返回null
+     */
+    public static HashSet<AppWidgetAttribute> getFolderNoteWidget(ContentResolver resolver, long folderId) {
+        Cursor c = resolver.query(Notes.CONTENT_NOTE_URI,
+                new String[] { NoteColumns.WIDGET_ID, NoteColumns.WIDGET_TYPE },
+                NoteColumns.PARENT_ID + "=?",
+                new String[] { String.valueOf(folderId) },
+                null);
+
+        HashSet<AppWidgetAttribute> set = null;
+        if (c != null) {
+            if (c.moveToFirst()) {
+                set = new HashSet<AppWidgetAttribute>();
+                do {
+                    try {
+                        AppWidgetAttribute widget = new AppWidgetAttribute();
+                        widget.widgetId = c.getInt(0);
+                        widget.widgetType = c.getInt(1);
+                        set.add(widget);
+                    } catch (IndexOutOfBoundsException e) {
+                        Log.e(TAG, e.toString());
+                    }
+                } while (c.moveToNext());
+            }
+            c.close();
+        }
+        return set;
+    }
+
+    /**
+     * 根据笔记ID获取通话记录的电话号码
+     * @param resolver ContentResolver对象
+     * @param noteId 笔记ID
+     * @return 电话号码，如果没有则返回空字符串
+     */
+    public static String getCallNumberByNoteId(ContentResolver resolver, long noteId) {
+        Cursor cursor = resolver.query(Notes.CONTENT_DATA_URI,
+                new String [] { CallNote.PHONE_NUMBER },
+                CallNote.NOTE_ID + "=? AND " + CallNote.MIME_TYPE + "=?",
+                new String [] { String.valueOf(noteId), CallNote.CONTENT_ITEM_TYPE },
+                null);
+
+        if (cursor != null && cursor.moveToFirst()) {
+            try {
+                return cursor.getString(0);
+            } catch (IndexOutOfBoundsException e) {
+                Log.e(TAG, "Get call number fails " + e.toString());
+            } finally {
+                cursor.close();
+            }
+        }
+        return "";
+    }
+
+    /**
+     * 根据电话号码和通话日期获取笔记ID
+     * @param resolver ContentResolver对象
+     * @param phoneNumber 电话号码
+     * @param callDate 通话日期
+     * @return 笔记ID，如果没有找到则返回0
+     */
+    public static long getNoteIdByPhoneNumberAndCallDate(ContentResolver resolver, String phoneNumber, long callDate) {
+        Cursor cursor = resolver.query(Notes.CONTENT_DATA_URI,
+                new String [] { CallNote.NOTE_ID },
+                CallNote.CALL_DATE + "=? AND " + CallNote.MIME_TYPE + "=? AND PHONE_NUMBERS_EQUAL("
+                + CallNote.PHONE_NUMBER + ",?)",
+                new String [] { String.valueOf(callDate), CallNote.CONTENT_ITEM_TYPE, phoneNumber },
+                null);
+
+        if (cursor != null) {
+            if (cursor.moveToFirst()) {
+                try {
+                    return cursor.getLong(0);
+                } catch (IndexOutOfBoundsException e) {
+                    Log.e(TAG, "Get call note id fails " + e.toString());
+                }
+            }
+            cursor.close();
+        }
+        return 0;
+    }
+
+    /**
+     * 根据笔记ID获取笔记摘要
+     * @param resolver ContentResolver对象
+     * @param noteId 笔记ID
+     * @return 笔记摘要
+     * @throws IllegalArgumentException 如果找不到对应的笔记
+     */
+    public static String getSnippetById(ContentResolver resolver, long noteId) {
+        Cursor cursor = resolver.query(Notes.CONTENT_NOTE_URI,
+                new String [] { NoteColumns.SNIPPET },
+                NoteColumns.ID + "=?",
+                new String [] { String.valueOf(noteId)},
+                null);
+
+        if (cursor != null) {
+            String snippet = "";
+            if (cursor.moveToFirst()) {
+                snippet = cursor.getString(0);
+            }
+            cursor.close();
+            return snippet;
+        }
+        throw new IllegalArgumentException("Note is not found with id: " + noteId);
+    }
+
+    /**
+     * 格式化笔记摘要，截取第一行内容
+     * @param snippet 原始摘要
+     * @return 格式化后的摘要
+     */
+    public static String getFormattedSnippet(String snippet) {
+        if (snippet != null) {
+            snippet = snippet.trim();
+            int index = snippet.indexOf('\n');
+            if (index != -1) {
+                snippet = snippet.substring(0, index);
+            }
+        }
+        return snippet;
+    }
+}

src/tools/GTaskStringUtils.java

@@ -0,0 +1,162 @@
+/*
+ * 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.tool;
+
+/**
+ * GTaskStringUtils类定义了与Google Tasks同步相关的字符串常量。
+ * 这些常量用于JSON数据格式中的键名、特殊文件夹名称和元数据标识等。
+ */
+public class GTaskStringUtils {
+
+    // 用于标识JSON数据中的操作ID字段
+    public final static String GTASK_JSON_ACTION_ID = "action_id";
+    
+    // 用于标识JSON数据中的操作列表字段
+    public final static String GTASK_JSON_ACTION_LIST = "action_list";
+    
+    // 用于标识JSON数据中的操作类型字段
+    public final static String GTASK_JSON_ACTION_TYPE = "action_type";
+    
+    // 用于标识创建操作的操作类型值
+    public final static String GTASK_JSON_ACTION_TYPE_CREATE = "create";
+    
+    // 用于标识获取所有数据操作的操作类型值
+    public final static String GTASK_JSON_ACTION_TYPE_GETALL = "get_all";
+    
+    // 用于标识移动操作的操作类型值
+    public final static String GTASK_JSON_ACTION_TYPE_MOVE = "move";
+    
+    // 用于标识更新操作的操作类型值
+    public final static String GTASK_JSON_ACTION_TYPE_UPDATE = "update";
+    
+    // 用于标识JSON数据中的创建者ID字段
+    public final static String GTASK_JSON_CREATOR_ID = "creator_id";
+    
+    // 用于标识JSON数据中的子实体字段
+    public final static String GTASK_JSON_CHILD_ENTITY = "child_entity";
+    
+    // 用于标识JSON数据中的客户端版本字段
+    public final static String GTASK_JSON_CLIENT_VERSION = "client_version";
+    
+    // 用于标识JSON数据中的完成状态字段
+    public final static String GTASK_JSON_COMPLETED = "completed";
+    
+    // 用于标识JSON数据中的当前列表ID字段
+    public final static String GTASK_JSON_CURRENT_LIST_ID = "current_list_id";
+    
+    // 用于标识JSON数据中的默认列表ID字段
+    public final static String GTASK_JSON_DEFAULT_LIST_ID = "default_list_id";
+    
+    // 用于标识JSON数据中的删除状态字段
+    public final static String GTASK_JSON_DELETED = "deleted";
+    
+    // 用于标识JSON数据中的目标列表字段
+    public final static String GTASK_JSON_DEST_LIST = "dest_list";
+    
+    // 用于标识JSON数据中的目标父级字段
+    public final static String GTASK_JSON_DEST_PARENT = "dest_parent";
+    
+    // 用于标识JSON数据中的目标父级类型字段
+    public final static String GTASK_JSON_DEST_PARENT_TYPE = "dest_parent_type";
+    
+    // 用于标识JSON数据中的实体差异字段
+    public final static String GTASK_JSON_ENTITY_DELTA = "entity_delta";
+    
+    // 用于标识JSON数据中的实体类型字段
+    public final static String GTASK_JSON_ENTITY_TYPE = "entity_type";
+    
+    // 用于标识JSON数据中的获取已删除项字段
+    public final static String GTASK_JSON_GET_DELETED = "get_deleted";
+    
+    // 用于标识JSON数据中的ID字段
+    public final static String GTASK_JSON_ID = "id";
+    
+    // 用于标识JSON数据中的索引字段
+    public final static String GTASK_JSON_INDEX = "index";
+    
+    // 用于标识JSON数据中的最后修改时间字段
+    public final static String GTASK_JSON_LAST_MODIFIED = "last_modified";
+    
+    // 用于标识JSON数据中的最新同步点字段
+    public final static String GTASK_JSON_LATEST_SYNC_POINT = "latest_sync_point";
+    
+    // 用于标识JSON数据中的列表ID字段
+    public final static String GTASK_JSON_LIST_ID = "list_id";
+    
+    // 用于标识JSON数据中的列表集合字段
+    public final static String GTASK_JSON_LISTS = "lists";
+    
+    // 用于标识JSON数据中的名称字段
+    public final static String GTASK_JSON_NAME = "name";
+    
+    // 用于标识JSON数据中的新ID字段
+    public final static String GTASK_JSON_NEW_ID = "new_id";
+    
+    // 用于标识JSON数据中的备注字段
+    public final static String GTASK_JSON_NOTES = "notes";
+    
+    // 用于标识JSON数据中的父级ID字段
+    public final static String GTASK_JSON_PARENT_ID = "parent_id";
+    
+    // 用于标识JSON数据中的前一个兄弟节点ID字段
+    public final static String GTASK_JSON_PRIOR_SIBLING_ID = "prior_sibling_id";
+    
+    // 用于标识JSON数据中的结果字段
+    public final static String GTASK_JSON_RESULTS = "results";
+    
+    // 用于标识JSON数据中的源列表字段
+    public final static String GTASK_JSON_SOURCE_LIST = "source_list";
+    
+    // 用于标识JSON数据中的任务集合字段
+    public final static String GTASK_JSON_TASKS = "tasks";
+    
+    // 用于标识JSON数据中的类型字段
+    public final static String GTASK_JSON_TYPE = "type";
+    
+    // 用于标识组类型的值
+    public final static String GTASK_JSON_TYPE_GROUP = "GROUP";
+    
+    // 用于标识任务类型的值
+    public final static String GTASK_JSON_TYPE_TASK = "TASK";
+    
+    // 用于标识JSON数据中的用户字段
+    public final static String GTASK_JSON_USER = "user";
+    
+    // MIUI便签在Google Tasks中的文件夹前缀
+    public final static String MIUI_FOLDER_PREFFIX = "[MIUI_Notes]";
+    
+    // 默认文件夹名称
+    public final static String FOLDER_DEFAULT = "Default";
+    
+    // 通话记录文件夹名称
+    public final static String FOLDER_CALL_NOTE = "Call_Note";
+    
+    // 元数据文件夹名称
+    public final static String FOLDER_META = "METADATA";
+    
+    // 元数据头部的Google Tasks ID标识
+    public final static String META_HEAD_GTASK_ID = "meta_gid";
+    
+    // 元数据头部的便签标识
+    public final static String META_HEAD_NOTE = "meta_note";
+    
+    // 元数据头部的数据标识
+    public final static String META_HEAD_DATA = "meta_data";
+    
+    // 元数据便签的名称，提示不要更新和删除
+    public final static String META_NOTE_NAME = "[META INFO] DON'T UPDATE AND DELETE";
+}

src/tools/ResourceParser.java

@@ -0,0 +1,269 @@
+/*
+ * 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.tool;
+
+import android.content.Context;
+import android.preference.PreferenceManager;
+
+import net.micode.notes.R;
+import net.micode.notes.ui.NotesPreferenceActivity;
+
+/**
+ * ResourceParser类用于解析和管理应用中的各种界面资源，包括背景颜色、文本大小等。
+ * 它提供了统一的接口来获取这些资源，确保应用界面风格的一致性。
+ */
+public class ResourceParser {
+
+    // 定义笔记支持的颜色常量
+    public static final int YELLOW           = 0;
+    public static final int BLUE             = 1;
+    public static final int WHITE            = 2;
+    public static final int GREEN            = 3;
+    public static final int RED              = 4;
+
+    // 默认背景颜色为黄色
+    public static final int BG_DEFAULT_COLOR = YELLOW;
+
+    // 定义文本大小常量
+    public static final int TEXT_SMALL       = 0;
+    public static final int TEXT_MEDIUM      = 1;
+    public static final int TEXT_LARGE       = 2;
+    public static final int TEXT_SUPER       = 3;
+
+    // 默认字体大小为中等
+    public static final int BG_DEFAULT_FONT_SIZE = TEXT_MEDIUM;
+
+    /**
+     * 笔记编辑界面的背景资源管理类
+     */
+    public static class NoteBgResources {
+        // 笔记编辑界面的背景资源数组
+        private final static int [] BG_EDIT_RESOURCES = new int [] {
+            R.drawable.edit_yellow,
+            R.drawable.edit_blue,
+            R.drawable.edit_white,
+            R.drawable.edit_green,
+            R.drawable.edit_red
+        };
+
+        // 笔记编辑界面标题栏的背景资源数组
+        private final static int [] BG_EDIT_TITLE_RESOURCES = new int [] {
+            R.drawable.edit_title_yellow,
+            R.drawable.edit_title_blue,
+            R.drawable.edit_title_white,
+            R.drawable.edit_title_green,
+            R.drawable.edit_title_red
+        };
+
+        /**
+         * 根据颜色ID获取笔记编辑界面的背景资源ID
+         * @param id 颜色ID
+         * @return 对应的背景资源ID
+         */
+        public static int getNoteBgResource(int id) {
+            return BG_EDIT_RESOURCES[id];
+        }
+
+        /**
+         * 根据颜色ID获取笔记编辑界面标题栏的背景资源ID
+         * @param id 颜色ID
+         * @return 对应的标题栏背景资源ID
+         */
+        public static int getNoteTitleBgResource(int id) {
+            return BG_EDIT_TITLE_RESOURCES[id];
+        }
+    }
+
+    /**
+     * 获取默认的笔记背景颜色ID
+     * 如果用户在设置中启用了随机背景颜色，则返回随机颜色ID
+     * 否则返回默认的黄色背景ID
+     * @param context 应用上下文
+     * @return 默认背景颜色ID
+     */
+    public static int getDefaultBgId(Context context) {
+        if (PreferenceManager.getDefaultSharedPreferences(context).getBoolean(
+                NotesPreferenceActivity.PREFERENCE_SET_BG_COLOR_KEY, false)) {
+            return (int) (Math.random() * NoteBgResources.BG_EDIT_RESOURCES.length);
+        } else {
+            return BG_DEFAULT_COLOR;
+        }
+    }
+
+    /**
+     * 笔记列表项的背景资源管理类
+     */
+    public static class NoteItemBgResources {
+        // 列表中第一个笔记项的背景资源数组
+        private final static int [] BG_FIRST_RESOURCES = new int [] {
+            R.drawable.list_yellow_up,
+            R.drawable.list_blue_up,
+            R.drawable.list_white_up,
+            R.drawable.list_green_up,
+            R.drawable.list_red_up
+        };
+
+        // 列表中中间笔记项的背景资源数组
+        private final static int [] BG_NORMAL_RESOURCES = new int [] {
+            R.drawable.list_yellow_middle,
+            R.drawable.list_blue_middle,
+            R.drawable.list_white_middle,
+            R.drawable.list_green_middle,
+            R.drawable.list_red_middle
+        };
+
+        // 列表中最后一个笔记项的背景资源数组
+        private final static int [] BG_LAST_RESOURCES = new int [] {
+            R.drawable.list_yellow_down,
+            R.drawable.list_blue_down,
+            R.drawable.list_white_down,
+            R.drawable.list_green_down,
+            R.drawable.list_red_down,
+        };
+
+        // 列表中单独一个笔记项的背景资源数组
+        private final static int [] BG_SINGLE_RESOURCES = new int [] {
+            R.drawable.list_yellow_single,
+            R.drawable.list_blue_single,
+            R.drawable.list_white_single,
+            R.drawable.list_green_single,
+            R.drawable.list_red_single
+        };
+
+        /**
+         * 获取列表中第一个笔记项的背景资源ID
+         * @param id 颜色ID
+         * @return 对应的背景资源ID
+         */
+        public static int getNoteBgFirstRes(int id) {
+            return BG_FIRST_RESOURCES[id];
+        }
+
+        /**
+         * 获取列表中最后一个笔记项的背景资源ID
+         * @param id 颜色ID
+         * @return 对应的背景资源ID
+         */
+        public static int getNoteBgLastRes(int id) {
+            return BG_LAST_RESOURCES[id];
+        }
+
+        /**
+         * 获取列表中单独一个笔记项的背景资源ID
+         * @param id 颜色ID
+         * @return 对应的背景资源ID
+         */
+        public static int getNoteBgSingleRes(int id) {
+            return BG_SINGLE_RESOURCES[id];
+        }
+
+        /**
+         * 获取列表中中间笔记项的背景资源ID
+         * @param id 颜色ID
+         * @return 对应的背景资源ID
+         */
+        public static int getNoteBgNormalRes(int id) {
+            return BG_NORMAL_RESOURCES[id];
+        }
+
+        /**
+         * 获取文件夹项的背景资源ID
+         * @return 文件夹背景资源ID
+         */
+        public static int getFolderBgRes() {
+            return R.drawable.list_folder;
+        }
+    }
+
+    /**
+     * 桌面小部件的背景资源管理类
+     */
+    public static class WidgetBgResources {
+        // 2x大小小部件的背景资源数组
+        private final static int [] BG_2X_RESOURCES = new int [] {
+            R.drawable.widget_2x_yellow,
+            R.drawable.widget_2x_blue,
+            R.drawable.widget_2x_white,
+            R.drawable.widget_2x_green,
+            R.drawable.widget_2x_red,
+        };
+
+        /**
+         * 获取2x大小小部件的背景资源ID
+         * @param id 颜色ID
+         * @return 对应的背景资源ID
+         */
+        public static int getWidget2xBgResource(int id) {
+            return BG_2X_RESOURCES[id];
+        }
+
+        // 4x大小小部件的背景资源数组
+        private final static int [] BG_4X_RESOURCES = new int [] {
+            R.drawable.widget_4x_yellow,
+            R.drawable.widget_4x_blue,
+            R.drawable.widget_4x_white,
+            R.drawable.widget_4x_green,
+            R.drawable.widget_4x_red
+        };
+
+        /**
+         * 获取4x大小小部件的背景资源ID
+         * @param id 颜色ID
+         * @return 对应的背景资源ID
+         */
+        public static int getWidget4xBgResource(int id) {
+            return BG_4X_RESOURCES[id];
+        }
+    }
+
+    /**
+     * 文本样式资源管理类
+     */
+    public static class TextAppearanceResources {
+        // 文本样式资源数组
+        private final static int [] TEXTAPPEARANCE_RESOURCES = new int [] {
+            R.style.TextAppearanceNormal,
+            R.style.TextAppearanceMedium,
+            R.style.TextAppearanceLarge,
+            R.style.TextAppearanceSuper
+        };
+
+        /**
+         * 根据字体大小ID获取对应的文本样式资源ID
+         * @param id 字体大小ID
+         * @return 对应的文本样式资源ID
+         */
+        public static int getTexAppearanceResource(int id) {
+            /**
+             * HACKME: 修复将资源ID存储在共享偏好中的问题。
+             * 如果ID大于资源数组的长度，返回默认的字体大小资源ID
+             */
+            if (id >= TEXTAPPEARANCE_RESOURCES.length) {
+                return BG_DEFAULT_FONT_SIZE;
+            }
+            return TEXTAPPEARANCE_RESOURCES[id];
+        }
+
+        /**
+         * 获取文本样式资源数组的大小
+         * @return 资源数组的长度
+         */
+        public static int getResourcesSize() {
+            return TEXTAPPEARANCE_RESOURCES.length;
+        }
+    }
+}