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zhangyongpeng 2 months ago
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BackupUtils.java
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/*
* 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;
/**
* 备份工具类，用于将笔记导出为文本文件。
*/
public class BackupUtils {
private static final String TAG = "BackupUtils";
// 单例模式相关
private static BackupUtils sInstance;
/**
* 获取 BackupUtils 的单例实例。
*
* @param context 上下文
* @return BackupUtils 实例
*/
public static synchronized BackupUtils getInstance(Context context) {
if (sInstance == null) {
sInstance = new BackupUtils(context);
}
return sInstance;
}
/**
* 定义备份和恢复状态的常量。
*/
public static final int STATE_SD_CARD_UNMOUONTED = 0; // SD 卡未挂载
public static final int STATE_BACKUP_FILE_NOT_EXIST = 1; // 备份文件不存在
public static final int STATE_DATA_DESTROIED = 2; // 数据格式不正确
public static final int STATE_SYSTEM_ERROR = 3; // 系统错误
public static final int STATE_SUCCESS = 4; // 成功
private TextExport mTextExport;
private BackupUtils(Context context) {
mTextExport = new TextExport(context);
}
/**
* 检查外部存储是否可用。
*
* @return 如果外部存储可用则返回 true，否则返回 false
*/
private static boolean externalStorageAvailable() {
return Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState());
}
/**
* 将笔记导出为文本文件。
*
* @return 导出结果的状态码
*/
public int exportToText() {
return mTextExport.exportToText();
}
/**
* 获取导出的文本文件名。
*
* @return 文件名
*/
public String getExportedTextFileName() {
return mTextExport.mFileName;
}
/**
* 获取导出的文本文件目录。
*
* @return 文件目录
*/
public String getExportedTextFileDir() {
return mTextExport.mFileDirectory;
}
/**
* 内部类，用于处理笔记导出到文本文件的具体逻辑。
*/
private static class TextExport {
// 查询笔记时使用的列
private static final String[] NOTE_PROJECTION = {
NoteColumns.ID,
NoteColumns.MODIFIED_DATE,
NoteColumns.SNIPPET,
NoteColumns.TYPE
};
// 查询数据时使用的列
private static final String[] DATA_PROJECTION = {
DataColumns.CONTENT,
DataColumns.MIME_TYPE,
DataColumns.DATA1,
DataColumns.DATA2,
DataColumns.DATA3,
DataColumns.DATA4,
};
private final String[] TEXT_FORMAT;
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 = "";
}
/**
* 根据 ID 获取格式化字符串。
*
* @param id 格式 ID
* @return 格式化字符串
*/
private String getFormat(int id) {
return TEXT_FORMAT[id];
}
/**
* 将指定文件夹中的笔记导出为文本。
*
* @param folderId 文件夹 ID
* @param ps PrintStream 对象
*/
private void exportFolderToText(String folderId, PrintStream ps) {
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 {
ps.println(String.format(getFormat(1), DateFormat.format(
mContext.getString(R.string.format_datetime_mdhm),
notesCursor.getLong(1))));
String noteId = notesCursor.getString(0);
exportNoteToText(noteId, ps);
} while (notesCursor.moveToNext());
}
notesCursor.close();
}
}
/**
* 将指定笔记导出为文本。
*
* @param noteId 笔记 ID
* @param ps PrintStream 对象
*/
private void exportNoteToText(String noteId, PrintStream ps) {
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(1);
if (DataConstants.CALL_NOTE.equals(mimeType)) {
String phoneNumber = dataCursor.getString(4);
long callDate = dataCursor.getLong(2);
String location = dataCursor.getString(0);
if (!TextUtils.isEmpty(phoneNumber)) {
ps.println(String.format(getFormat(2), phoneNumber));
}
ps.println(String.format(getFormat(2), DateFormat.format(
mContext.getString(R.string.format_datetime_mdhm),
callDate)));
if (!TextUtils.isEmpty(location)) {
ps.println(String.format(getFormat(2), location));
}
} else if (DataConstants.NOTE.equals(mimeType)) {
String content = dataCursor.getString(0);
if (!TextUtils.isEmpty(content)) {
ps.println(String.format(getFormat(2), content));
}
}
} while (dataCursor.moveToNext());
}
dataCursor.close();
}
try {
ps.write(new byte[]{Character.LINE_SEPARATOR, Character.LETTER_NUMBER});
} catch (IOException e) {
Log.e(TAG, e.toString());
}
}
/**
* 将笔记导出为用户可读的文本文件。
*
* @return 导出结果的状态码
*/
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;
}
// 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 {
String folderName = "";
if (folderCursor.getLong(0) == Notes.ID_CALL_RECORD_FOLDER) {
folderName = mContext.getString(R.string.call_record_folder_name);
} else {
folderName = folderCursor.getString(2);
}
if (!TextUtils.isEmpty(folderName)) {
ps.println(String.format(getFormat(0), folderName));
}
String folderId = folderCursor.getString(0);
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(1), DateFormat.format(
mContext.getString(R.string.format_datetime_mdhm),
noteCursor.getLong(1))));
String noteId = noteCursor.getString(0);
exportNoteToText(noteId, ps);
} while (noteCursor.moveToNext());
}
noteCursor.close();
}
ps.close();
return STATE_SUCCESS;
}
/**
* 获取指向导出文件的 PrintStream 对象。
*
* @return PrintStream 对象
*/
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 | NullPointerException e) {
e.printStackTrace();
return null;
}
return ps;
}
}
/**
* 在 SD 卡上生成用于存储导出数据的文件。
*
* @param context 上下文
* @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
*/
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 | IOException e) {
e.printStackTrace();
}
return null;
}
}
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