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/*
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* 版权所有 (c) 2010-2011, The MiCode 开源社区 (www.micode.net)
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*
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* 根据 Apache License, Version 2.0(“许可证”)获得许可;
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* 除非遵守许可证,否则不得使用此文件。
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* 您可以在以下网址获得许可证的副本:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* 除非适用法律要求或书面同意,否则根据许可证分发的软件以“原样”分发,
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* 没有任何明示或暗示的保证,包括但不限于适销性、针对特定用途的适用性等任何明示或暗示的保证。
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* 请参阅许可证以获取有关许可下的权利和限制的特定语言。
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*/
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package net.micode.notes.tool; // 定义包名
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import android.content.Context; // Android 上下文类
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import android.database.Cursor; // 数据库游标
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import android.os.Environment; // 外部存储环境类
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import android.text.TextUtils; // 文本工具类
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import android.text.format.DateFormat; // 日期格式化工具类
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import android.util.Log; // 日志工具类
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import net.micode.notes.R; // 资源类
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import net.micode.notes.data.Notes; // 笔记数据类
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import net.micode.notes.data.Notes.DataColumns; // 笔记数据列类
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import net.micode.notes.data.Notes.DataConstants; // 笔记数据常量类
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import net.micode.notes.data.Notes.NoteColumns; // 笔记列类
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import java.io.File; // 文件类
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import java.io.FileNotFoundException; // 文件未找到异常
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import java.io.FileOutputStream; // 文件输出流
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import java.io.IOException; // 输入输出异常
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import java.io.PrintStream; // 打印流
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public class BackupUtils {
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private static final String TAG = "BackupUtils"; // 日志标签
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// 单例模式相关
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private static BackupUtils sInstance; // 单例对象
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// 获取单例对象
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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); // 如果为空则新建一个实例
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}
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return sInstance; // 返回单例对象
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}
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/**
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* 以下状态用于表示备份或恢复的状态
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*/
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// 当前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,可能被其他程序更改
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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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private TextExport mTextExport; // 文本导出器
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// 构造函数
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private BackupUtils(Context context) {
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mTextExport = new TextExport(context); // 初始化文本导出器
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}
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// 检查外部存储是否可用
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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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// 导出到文本
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public int exportToText() {
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return mTextExport.exportToText(); // 调用文本导出器的导出方法
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}
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// 获取导出文本文件名
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public String getExportedTextFileName() {
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return mTextExport.mFileName; // 返回文本导出器的文件名
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}
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// 获取导出文本文件目录
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public String getExportedTextFileDir() {
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return mTextExport.mFileDirectory; // 返回文本导出器的文件目录
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}
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// 内部类:文本导出器
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private static class TextExport {
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// 笔记查询投影数组
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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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NoteColumns.SNIPPET,
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NoteColumns.TYPE
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};
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// 数据列索引
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private static final int NOTE_COLUMN_ID = 0;
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private static final int NOTE_COLUMN_MODIFIED_DATE = 1;
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private static final int NOTE_COLUMN_SNIPPET = 2;
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// 数据查询投影数组
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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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DataColumns.DATA1,
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DataColumns.DATA2,
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DataColumns.DATA3,
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DataColumns.DATA4,
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};
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// 数据列索引
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private static final int DATA_COLUMN_CONTENT = 0;
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private static final int DATA_COLUMN_MIME_TYPE = 1;
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private static final int DATA_COLUMN_CALL_DATE = 2;
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private static final int DATA_COLUMN_PHONE_NUMBER = 4;
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// 文本格式数组
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private final String [] TEXT_FORMAT;
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// 文本格式索引
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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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private Context mContext; // Android 上下文
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private String mFileName; // 文件名
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private String mFileDirectory; // 文件目录
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// 构造函数
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public TextExport(Context context) {
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TEXT_FORMAT = context.getResources().getStringArray(R.array.format_for_exported_note); // 初始化文本格式
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mContext = context; // 初始化上下文
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mFileName = ""; // 初始化文件名
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mFileDirectory = ""; // 初始化文件目录
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}
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// 获取指定格式字符串
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private String getFormat(int id) {
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return TEXT_FORMAT[id]; // 返回文本格式数组中的字符串
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}
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/**
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* 将指定文件夹ID的文件夹导出为文本
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*/
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private void exportFolderToText(String folderId, PrintStream ps) {
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// 查询属于此文件夹的笔记
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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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if (notesCursor != null) {
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if (notesCursor.moveToFirst()) {
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do {
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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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// 查询属于此笔记的数据
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String noteId = notesCursor.getString(NOTE_COLUMN_ID);
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exportNoteToText(noteId, ps); // 导出笔记到文本
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} while (notesCursor.moveToNext());
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}
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notesCursor.close(); // 关闭游标
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}
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}
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/**
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* 将指定ID的笔记导出到打印流
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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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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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// 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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if (!TextUtils.isEmpty(phoneNumber)) {
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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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// 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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// 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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}
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} else if (DataConstants.NOTE.equals(mimeType)) {
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String content = dataCursor.getString(DATA_COLUMN_CONTENT);
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if (!TextUtils.isEmpty(content)) {
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ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT),
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content));
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}
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}
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} while (dataCursor.moveToNext());
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}
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dataCursor.close(); // 关闭游标
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}
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// 打印笔记之间的分隔线
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try {
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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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Log.e(TAG, e.toString()); // 记录错误日志
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}
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}
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/**
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* 将笔记导出为用户可读的文本
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*/
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public int exportToText() {
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if (!externalStorageAvailable()) {
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Log.d(TAG, "Media was not mounted"); // 记录日志:媒体未挂载
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return STATE_SD_CARD_UNMOUONTED; // 返回状态:sd卡未挂载
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}
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PrintStream ps = getExportToTextPrintStream(); // 获取打印流
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if (ps == null) {
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Log.e(TAG, "get print stream error"); // 记录日志:获取打印流错误
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return STATE_SYSTEM_ERROR; // 返回状态:系统错误
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}
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// 首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,"(" + NoteColumns.TYPE + "=" + Notes.TYPE_FOLDER + " AND "
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+ NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER + ") OR "
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+ NoteColumns.ID + "=" + Notes.ID_CALL_RECORD_FOLDER, null, null);
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if (folderCursor != null) {
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if (folderCursor.moveToFirst()) {
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do {
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// 打印文件夹的名称
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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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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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}
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if (!TextUtils.isEmpty(folderName)) {
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ps.println(String.format(getFormat(FORMAT_FOLDER_NAME), folderName));
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}
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String folderId = folderCursor.getString(NOTE_COLUMN_ID);
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exportFolderToText(folderId, ps); // 导出文件夹到文本
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} while (folderCursor.moveToNext());
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}
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folderCursor.close(); // 关闭游标
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}
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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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+ "=0", null, null);
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if (noteCursor != null) {
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if (noteCursor.moveToFirst()) {
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do {
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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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noteCursor.getLong(NOTE_COLUMN_MODIFIED_DATE))));
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// 查询属于此笔记的数据
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String noteId = noteCursor.getString(NOTE_COLUMN_ID);
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exportNoteToText(noteId, ps); // 导出笔记到文本
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} while (noteCursor.moveToNext());
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}
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noteCursor.close(); // 关闭游标
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}
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ps.close(); // 关闭打印流
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return STATE_SUCCESS; // 返回状态:成功
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}
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/**
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* 获取指向导出文本文件的打印流
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*/
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private PrintStream getExportToTextPrintStream() {
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File file = generateFileMountedOnSDcard(mContext, R.string.file_path,
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R.string.file_name_txt_format);
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if (file == null) {
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Log.e(TAG, "create file to exported failed"); // 记录日志:创建导出文件失败
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return null;
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}
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mFileName = file.getName(); // 设置文件名
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mFileDirectory = mContext.getString(R.string.file_path); // 设置文件目录
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PrintStream ps = null;
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try {
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FileOutputStream fos = new FileOutputStream(file); // 创建文件输出流
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ps = new PrintStream(fos); // 创建打印流
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} catch (FileNotFoundException e) {
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e.printStackTrace(); // 打印堆栈跟踪
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return null;
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} catch (NullPointerException e) {
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e.printStackTrace(); // 打印堆栈跟踪
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return null;
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}
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return ps; // 返回打印流
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}
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}
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/**
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* 在挂载的SD卡上生成用于存储导入数据的文本文件
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*/
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private static File generateFileMountedOnSDcard(Context context, int filePathResId, int fileNameFormatResId) {
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StringBuilder sb = new StringBuilder(); // 创建字符串构建器
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sb.append(Environment.getExternalStorageDirectory()); // 追加外部存储目录
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sb.append(context.getString(filePathResId)); // 追加文件路径资源ID
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File filedir = new File(sb.toString()); // 创建文件目录
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sb.append(context.getString( // 追加格式化后的文件名
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fileNameFormatResId,
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DateFormat.format(context.getString(R.string.format_date_ymd),
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System.currentTimeMillis())));
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File file = new File(sb.toString()); // 创建文件
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try {
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if (!filedir.exists()) { // 如果文件目录不存在
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filedir.mkdir(); // 创建目录
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}
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if (!file.exists()) { // 如果文件不存在
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file.createNewFile(); // 创建新文件
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}
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return file; // 返回文件
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} catch (SecurityException e) {
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e.printStackTrace(); // 打印堆栈跟踪
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} catch (IOException e) {
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e.printStackTrace(); // 打印堆栈跟踪
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}
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return null; // 返回null
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}
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}
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