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@ -35,12 +35,23 @@ import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.PrintStream;
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/**
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* 备份工具类,提供数据备份相关的功能,如将数据导出为文本文件等
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* 此类主要用于将笔记数据(包括文件夹和笔记内容)导出到外部存储设备上的文本文件中
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*/
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public class BackupUtils {
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// 日志标签,用于在日志中标识此工具类的相关操作
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private static final String TAG = "BackupUtils";
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// Singleton stuff
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// 单例实例,用于确保BackupUtils类只有一个实例存在
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private static BackupUtils sInstance;
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/**
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* 获取BackupUtils的单例实例
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* 如果实例不存在则创建一个新的实例,否则返回已有的实例
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*
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* @param context 上下文对象,用于访问系统资源和内容解析器等
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* @return BackupUtils的单例实例
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*/
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public static synchronized BackupUtils getInstance(Context context) {
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if (sInstance == null) {
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sInstance = new BackupUtils(context);
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@ -49,43 +60,74 @@ public class BackupUtils {
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}
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/**
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* Following states are signs to represents backup or restore
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* status
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* 备份或恢复状态标识
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* 以下状态用于表示备份或恢复操作的不同阶段或结果
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*/
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// Currently, the sdcard is not mounted
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public static final int STATE_SD_CARD_UNMOUONTED = 0;
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// The backup file not exist
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public static final int STATE_BACKUP_FILE_NOT_EXIST = 1;
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// The data is not well formated, may be changed by other programs
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public static final int STATE_DATA_DESTROIED = 2;
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// Some run-time exception which causes restore or backup fails
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public static final int STATE_SYSTEM_ERROR = 3;
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// Backup or restore success
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public static final int STATE_SUCCESS = 4;
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// 外部存储设备(如SD卡)未挂载
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public static final int STATE_SD_CARD_UNMOUONTED = 0;
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// 备份文件不存在
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public static final int STATE_BACKUP_FILE_NOT_EXIST = 1;
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// 数据格式不正确,可能被其他程序修改过
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public static final int STATE_DATA_DESTROIED = 2;
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// 运行时异常导致备份或恢复失败
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public static final int STATE_SYSTEM_ERROR = 3;
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// 备份或恢复成功
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public static final int STATE_SUCCESS = 4;
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// 文本导出工具类实例,用于实际的文本导出操作
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private TextExport mTextExport;
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/**
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* 构造函数,初始化文本导出工具类实例
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*
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* @param context 上下文对象,用于创建TextExport实例
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*/
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private BackupUtils(Context context) {
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mTextExport = new TextExport(context);
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}
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/**
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* 检查外部存储设备是否可用(已挂载)
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*
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* @return 如果外部存储设备已挂载返回true,否则返回false
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*/
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private static boolean externalStorageAvailable() {
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return Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState());
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}
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/**
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* 将数据导出为文本文件
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* 调用TextExport类的exportToText方法进行实际的导出操作
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*
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* @return 导出操作的状态码,如成功则返回STATE_SUCCESS,否则返回其他状态码
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*/
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public int exportToText() {
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return mTextExport.exportToText();
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}
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/**
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* 获取导出的文本文件名
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*
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* @return 导出的文本文件名
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*/
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public String getExportedTextFileName() {
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return mTextExport.mFileName;
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}
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/**
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* 获取导出的文本文件目录
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*
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* @return 导出的文本文件目录
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*/
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public String getExportedTextFileDir() {
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return mTextExport.mFileDirectory;
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}
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/**
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* 文本导出内部类,负责具体的文本导出操作
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*/
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private static class TextExport {
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// 笔记数据投影,指定查询笔记时需要返回的列
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private static final String[] NOTE_PROJECTION = {
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NoteColumns.ID,
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NoteColumns.MODIFIED_DATE,
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@ -93,12 +135,16 @@ public class BackupUtils {
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NoteColumns.TYPE
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};
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// 笔记ID列在NOTE_PROJECTION数组中的索引
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private static final int NOTE_COLUMN_ID = 0;
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// 笔记修改日期列在NOTE_PROJECTION数组中的索引
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private static final int NOTE_COLUMN_MODIFIED_DATE = 1;
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// 笔记摘要列在NOTE_PROJECTION数组中的索引
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private static final int NOTE_COLUMN_SNIPPET = 2;
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// 数据投影,指定查询笔记相关数据时需要返回的列
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private static final String[] DATA_PROJECTION = {
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DataColumns.CONTENT,
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DataColumns.MIME_TYPE,
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@ -108,23 +154,39 @@ public class BackupUtils {
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DataColumns.DATA4,
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};
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// 数据内容列在DATA_PROJECTION数组中的索引
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private static final int DATA_COLUMN_CONTENT = 0;
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// 数据MIME类型列在DATA_PROJECTION数组中的索引
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private static final int DATA_COLUMN_MIME_TYPE = 1;
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// 数据调用日期列在DATA_PROJECTION数组中的索引
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private static final int DATA_COLUMN_CALL_DATE = 2;
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// 数据电话号码列在DATA_PROJECTION数组中的索引
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private static final int DATA_COLUMN_PHONE_NUMBER = 4;
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private final String [] TEXT_FORMAT;
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private static final int FORMAT_FOLDER_NAME = 0;
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private static final int FORMAT_NOTE_DATE = 1;
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private static final int FORMAT_NOTE_CONTENT = 2;
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// 文本格式数组,从资源中获取的文本格式字符串数组
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private final String[] TEXT_FORMAT;
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// 文本格式中文件夹名称的索引
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private static final int FORMAT_FOLDER_NAME = 0;
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// 文本格式中笔记日期的索引
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private static final int FORMAT_NOTE_DATE = 1;
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// 文本格式中笔记内容的索引
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private static final int FORMAT_NOTE_CONTENT = 2;
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// 上下文对象,用于访问资源和内容解析器等
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private Context mContext;
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// 导出的文件名
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private String mFileName;
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// 导出的文件目录
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private String mFileDirectory;
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/**
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* 构造函数,初始化上下文、文本格式数组、文件名和文件目录
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*
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* @param context 上下文对象
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*/
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public TextExport(Context context) {
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TEXT_FORMAT = context.getResources().getStringArray(R.array.format_for_exported_note);
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mContext = context;
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@ -132,28 +194,36 @@ public class BackupUtils {
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mFileDirectory = "";
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}
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/**
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* 根据索引获取文本格式字符串
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*
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* @param id 格式字符串在TEXT_FORMAT数组中的索引
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* @return 对应的文本格式字符串
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*/
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private String getFormat(int id) {
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return TEXT_FORMAT[id];
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}
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/**
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* Export the folder identified by folder id to text
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* 将指定文件夹及其子笔记导出为文本
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* 先查询该文件夹下的所有笔记,然后对每个笔记调用exportNoteToText方法进行导出
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*
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* @param folderId 文件夹ID
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* @param ps 打印流,用于写入导出的文本内容
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*/
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private void exportFolderToText(String folderId, PrintStream ps) {
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// Query notes belong to this folder
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// 查询属于该文件夹的笔记
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Cursor notesCursor = mContext.getContentResolver().query(Notes.CONTENT_NOTE_URI,
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NOTE_PROJECTION, NoteColumns.PARENT_ID + "=?", new String[] {
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folderId
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}, null);
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NOTE_PROJECTION, NoteColumns.PARENT_ID + "=?", new String[]{folderId}, null);
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if (notesCursor != null) {
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if (notesCursor.moveToFirst()) {
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do {
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// Print note's last modified date
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// 打印笔记的最后修改日期
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ps.println(String.format(getFormat(FORMAT_NOTE_DATE), DateFormat.format(
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mContext.getString(R.string.format_datetime_mdhm),
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notesCursor.getLong(NOTE_COLUMN_MODIFIED_DATE))));
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// Query data belong to this note
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// 查询属于该笔记的数据
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String noteId = notesCursor.getString(NOTE_COLUMN_ID);
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exportNoteToText(noteId, ps);
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} while (notesCursor.moveToNext());
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@ -163,20 +233,22 @@ public class BackupUtils {
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}
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/**
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* Export note identified by id to a print stream
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* 将指定ID的笔记导出为文本
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* 根据笔记的MIME类型,处理不同类型的笔记内容并写入打印流
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*
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* @param noteId 笔记ID
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* @param ps 打印流,用于写入导出的文本内容
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*/
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private void exportNoteToText(String noteId, PrintStream ps) {
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Cursor dataCursor = mContext.getContentResolver().query(Notes.CONTENT_DATA_URI,
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DATA_PROJECTION, DataColumns.NOTE_ID + "=?", new String[] {
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noteId
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}, null);
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DATA_PROJECTION, DataColumns.NOTE_ID + "=?", new String[]{noteId}, null);
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if (dataCursor != null) {
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if (dataCursor.moveToFirst()) {
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do {
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String mimeType = dataCursor.getString(DATA_COLUMN_MIME_TYPE);
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if (DataConstants.CALL_NOTE.equals(mimeType)) {
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// Print phone number
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// 打印电话号码
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String phoneNumber = dataCursor.getString(DATA_COLUMN_PHONE_NUMBER);
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long callDate = dataCursor.getLong(DATA_COLUMN_CALL_DATE);
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String location = dataCursor.getString(DATA_COLUMN_CONTENT);
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@ -185,11 +257,11 @@ public class BackupUtils {
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ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT),
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phoneNumber));
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}
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// Print call date
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// 打印通话日期
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ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT), DateFormat
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.format(mContext.getString(R.string.format_datetime_mdhm),
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callDate)));
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// Print call attachment location
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// 打印通话附件位置
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if (!TextUtils.isEmpty(location)) {
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ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT),
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location));
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@ -205,9 +277,9 @@ public class BackupUtils {
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}
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dataCursor.close();
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}
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// print a line separator between note
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// 打印笔记之间的分隔符
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try {
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ps.write(new byte[] {
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ps.write(new byte[]{
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Character.LINE_SEPARATOR, Character.LETTER_NUMBER
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});
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} catch (IOException e) {
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@ -216,7 +288,10 @@ public class BackupUtils {
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}
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/**
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* Note will be exported as text which is user readable
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* 将数据导出为文本文件
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* 检查外部存储设备是否可用,创建打印流,导出文件夹和笔记数据,最后关闭打印流
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*
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* @return 导出操作的状态码,如成功则返回STATE_SUCCESS,否则返回其他状态码
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*/
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public int exportToText() {
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if (!externalStorageAvailable()) {
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@ -229,7 +304,7 @@ public class BackupUtils {
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Log.e(TAG, "get print stream error");
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return STATE_SYSTEM_ERROR;
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}
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// First export folder and its notes
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// 先导出文件夹及其笔记
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Cursor folderCursor = mContext.getContentResolver().query(
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Notes.CONTENT_NOTE_URI,
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NOTE_PROJECTION,
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@ -240,9 +315,9 @@ public class BackupUtils {
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if (folderCursor != null) {
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if (folderCursor.moveToFirst()) {
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do {
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// Print folder's name
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// 打印文件夹名称
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String folderName = "";
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if(folderCursor.getLong(NOTE_COLUMN_ID) == Notes.ID_CALL_RECORD_FOLDER) {
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if (folderCursor.getLong(NOTE_COLUMN_ID) == Notes.ID_CALL_RECORD_FOLDER) {
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folderName = mContext.getString(R.string.call_record_folder_name);
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} else {
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folderName = folderCursor.getString(NOTE_COLUMN_SNIPPET);
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@ -257,11 +332,11 @@ public class BackupUtils {
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folderCursor.close();
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}
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// Export notes in root's folder
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// 导出根文件夹中的笔记
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Cursor noteCursor = mContext.getContentResolver().query(
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Notes.CONTENT_NOTE_URI,
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NOTE_PROJECTION,
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NoteColumns.TYPE + "=" + +Notes.TYPE_NOTE + " AND " + NoteColumns.PARENT_ID
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NoteColumns.TYPE + "=" + Notes.TYPE_NOTE + " AND " + NoteColumns.PARENT_ID
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+ "=0", null, null);
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if (noteCursor != null) {
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@ -270,7 +345,7 @@ public class BackupUtils {
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ps.println(String.format(getFormat(FORMAT_NOTE_DATE), DateFormat.format(
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mContext.getString(R.string.format_datetime_mdhm),
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|
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|
noteCursor.getLong(NOTE_COLUMN_MODIFIED_DATE))));
|
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|
|
|
// Query data belong to this note
|
|
|
|
|
// 查询属于该笔记的数据
|
|
|
|
|
String noteId = noteCursor.getString(NOTE_COLUMN_ID);
|
|
|
|
|
exportNoteToText(noteId, ps);
|
|
|
|
|
} while (noteCursor.moveToNext());
|
|
|
|
@ -283,7 +358,10 @@ public class BackupUtils {
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* Get a print stream pointed to the file {@generateExportedTextFile}
|
|
|
|
|
* 获取用于导出文本的打印流
|
|
|
|
|
* 创建导出文件,获取文件路径和名称,创建打印流
|
|
|
|
|
*
|
|
|
|
|
* @return 用于导出文本的打印流,如果创建失败返回null
|
|
|
|
|
*/
|
|
|
|
|
private PrintStream getExportToTextPrintStream() {
|
|
|
|
|
File file = generateFileMountedOnSDcard(mContext, R.string.file_path,
|
|
|
|
@ -310,7 +388,13 @@ public class BackupUtils {
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* Generate the text file to store imported data
|
|
|
|
|
* 在外部存储设备上生成用于存储导入数据的文件
|
|
|
|
|
* 拼接文件路径和名称,创建文件夹(如果不存在)和文件(如果不存在)
|
|
|
|
|
*
|
|
|
|
|
* @param context 上下文对象
|
|
|
|
|
* @param filePathResId 文件路径资源ID
|
|
|
|
|
* @param fileNameFormatResId 文件名格式资源ID
|
|
|
|
|
* @return 生成的文件对象,如果创建失败返回null
|
|
|
|
|
*/
|
|
|
|
|
private static File generateFileMountedOnSDcard(Context context, int filePathResId, int fileNameFormatResId) {
|
|
|
|
|
StringBuilder sb = new StringBuilder();
|
|
|
|
@ -339,6 +423,4 @@ public class BackupUtils {
|
|
|
|
|
|
|
|
|
|
return null;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
}
|