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/*
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* Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package net.micode.notes.tool;
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import android.content.Context;
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import android.database.Cursor;
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import android.os.Environment;
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import android.text.TextUtils;
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import android.text.format.DateFormat;
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import android.util.Log;
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import net.micode.notes.R;
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import net.micode.notes.data.Notes;
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import net.micode.notes.data.Notes.DataColumns;
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import net.micode.notes.data.Notes.DataConstants;
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import net.micode.notes.data.Notes.NoteColumns;
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import java.io.File;
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import java.io.FileNotFoundException;
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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，提供将笔记数据导出为文本文件的功能
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*/
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public class BackupUtils {
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private static final String TAG = "BackupUtils";
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// 单例模式实现
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private static BackupUtils sInstance;
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/**
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* 获取BackupUtils实例（单例模式）
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* @param context 上下文对象
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* @return BackupUtils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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}
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return sInstance;
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}
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/**
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* 备份/恢复状态码定义
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*/
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public static final int STATE_SD_CARD_UNMOUONTED = 0; // SD卡未挂载
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public static final int STATE_BACKUP_FILE_NOT_EXIST = 1; // 备份文件不存在
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public static final int STATE_DATA_DESTROIED = 2; // 数据被破坏
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public static final int STATE_SYSTEM_ERROR = 3; // 系统错误
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public static final int STATE_SUCCESS = 4; // 操作成功
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private TextExport mTextExport; // 文本导出处理器
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/**
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* 私有构造函数
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* @param context 上下文对象
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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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* 检查外部存储是否可用
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* @return true如果外部存储已挂载且可写
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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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* 执行导出到文本文件操作
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* @return 操作状态码
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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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* @return 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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* @return 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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* 内部类：处理文本导出逻辑
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*/
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private static class TextExport {
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// 笔记查询的列名投影
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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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// 笔记列索引
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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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// 数据查询的列名投影
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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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// 文本格式定义（从资源文件中加载）
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private final String[] TEXT_FORMAT;
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private static final int FORMAT_FOLDER_NAME = 0; // 文件夹名称格式
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private static final int FORMAT_NOTE_DATE = 1; // 笔记日期格式
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private static final int FORMAT_NOTE_CONTENT = 2; // 笔记内容格式
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private Context mContext; // 上下文对象
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private String mFileName; // 导出文件名
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private String mFileDirectory; // 导出文件目录
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/**
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* 构造函数
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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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// 从资源文件中加载文本格式
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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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mFileName = "";
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mFileDirectory = "";
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}
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/**
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* 获取指定格式的字符串
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* @param id 格式ID
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* @return 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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* 将指定文件夹下的笔记导出到文本
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* @param folderId 文件夹ID
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* @param ps 打印流
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*/
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private void exportFolderToText(String folderId, PrintStream ps) {
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// 查询属于该文件夹的所有笔记
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Cursor notesCursor = mContext.getContentResolver().query(
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Notes.CONTENT_NOTE_URI,
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NOTE_PROJECTION,
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NoteColumns.PARENT_ID + "=?",
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new String[]{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(
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getFormat(FORMAT_NOTE_DATE),
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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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// 导出该笔记的内容
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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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}
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notesCursor.close();
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}
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}
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/**
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* 将指定笔记导出到文本
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* @param noteId 笔记ID
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* @param ps 打印流
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*/
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private void exportNoteToText(String noteId, PrintStream ps) {
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// 查询该笔记的所有数据项
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Cursor dataCursor = mContext.getContentResolver().query(
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Notes.CONTENT_DATA_URI,
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DATA_PROJECTION,
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DataColumns.NOTE_ID + "=?",
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new String[]{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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// 处理通话记录类型的笔记
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if (DataConstants.CALL_NOTE.equals(mimeType)) {
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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(
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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(
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getFormat(FORMAT_NOTE_CONTENT),
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DateFormat.format(
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mContext.getString(R.string.format_datetime_mdhm),
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callDate)));
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// 打印通话位置信息
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if (!TextUtils.isEmpty(location)) {
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ps.println(String.format(
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getFormat(FORMAT_NOTE_CONTENT),
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location));
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}
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}
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// 处理普通笔记类型
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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(
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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();
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}
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// 在笔记之间打印分隔线
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try {
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ps.write(new byte[]{Character.LINE_SEPARATOR, Character.LETTER_NUMBER});
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} catch (IOException e) {
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Log.e(TAG, e.toString());
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}
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}
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/**
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* 执行导出到文本文件操作
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* @return 操作状态码
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*/
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public int exportToText() {
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// 检查SD卡是否可用
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if (!externalStorageAvailable()) {
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Log.d(TAG, "Media was not mounted");
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return STATE_SD_CARD_UNMOUONTED;
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}
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// 获取打印流
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PrintStream ps = getExportToTextPrintStream();
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if (ps == null) {
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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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// 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,
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"(" + 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,
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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(
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getFormat(FORMAT_FOLDER_NAME),
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folderName));
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}
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// 导出该文件夹下的笔记
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String folderId = folderCursor.getString(NOTE_COLUMN_ID);
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exportFolderToText(folderId, ps);
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} while (folderCursor.moveToNext());
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}
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folderCursor.close();
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}
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// 导出根目录下的笔记
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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 + "=0",
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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(
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getFormat(FORMAT_NOTE_DATE),
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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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// 导出该笔记的内容
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String noteId = noteCursor.getString(NOTE_COLUMN_ID);
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exportNoteToText(noteId, ps);
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} while (noteCursor.moveToNext());
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}
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noteCursor.close();
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}
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ps.close();
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return STATE_SUCCESS;
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}
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/**
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* 获取指向导出文件的打印流
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* @return PrintStream对象，失败返回null
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*/
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private PrintStream getExportToTextPrintStream() {
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// 在SD卡上创建导出文件
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File file = generateFileMountedOnSDcard(
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mContext,
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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");
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return null;
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}
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mFileName = file.getName();
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mFileDirectory = mContext.getString(R.string.file_path);
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try {
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FileOutputStream fos = new FileOutputStream(file);
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return new PrintStream(fos);
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} catch (FileNotFoundException e) {
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e.printStackTrace();
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return null;
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} catch (NullPointerException e) {
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e.printStackTrace();
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return null;
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}
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}
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}
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/**
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* 在SD卡上生成导出文件
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* @param context 上下文对象
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* @param filePathResId 文件路径资源ID
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* @param fileNameFormatResId 文件名格式资源ID
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* @return 生成的File对象，失败返回null
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*/
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private static File generateFileMountedOnSDcard(
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Context context,
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int filePathResId,
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int fileNameFormatResId) {
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StringBuilder sb = new StringBuilder();
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sb.append(Environment.getExternalStorageDirectory());
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sb.append(context.getString(filePathResId));
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File filedir = new File(sb.toString());
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sb.append(context.getString(
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fileNameFormatResId,
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DateFormat.format(
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context.getString(R.string.format_date_ymd),
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System.currentTimeMillis())));
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File file = new File(sb.toString());
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try {
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// 创建目录（如果不存在）
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if (!filedir.exists()) {
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filedir.mkdir();
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}
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// 创建文件（如果不存在）
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if (!file.exists()) {
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file.createNewFile();
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}
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return file;
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} catch (SecurityException e) {
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e.printStackTrace();
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} catch (IOException e) {
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e.printStackTrace();
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}
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return null;
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}
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} |
