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backup部分注释

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dingxuXie 1 year ago
parent f8767baf3e
commit 87a684cf13
1 changed files with 69 additions and 43 deletions
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112
Notes-master/src/net/micode/notes/tool/BackupUtils.java
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@ -35,10 +35,10 @@ import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;
//笔记备份工具类
public class BackupUtils {
private static final String TAG = "BackupUtils";
// Singleton stuff
// Singleton stuff 单例模式
private static BackupUtils sInstance;
public static synchronized BackupUtils getInstance(Context context) {
@ -47,23 +47,34 @@ public class BackupUtils {
}
return sInstance;
}
/**
* Following states are signs to represents backup or restore
* status
*/
// Currently, the sdcard is not mounted
public static final int STATE_SD_CARD_UNMOUONTED = 0;
// The backup file not exist
// 备份和恢复功能
//定义备份或恢复数据时可能遇到的状态码。
public class BackupState {
//当前SD未挂载
public static final int STATE_SD_CARD_UNMOUNTED = 0;
//备份文件不存在
public static final int STATE_BACKUP_FILE_NOT_EXIST = 1;
// The data is not well formated, may be changed by other programs
public static final int STATE_DATA_DESTROIED = 2;
// Some run-time exception which causes restore or backup fails
// 数据格式不正确，可能被其他程序更改
public static final int STATE_DATA_DESTROYED = 2;
//运行时异常导致恢复或备份失败
public static final int STATE_SYSTEM_ERROR = 3;
// Backup or restore success
// 备份或恢复成功
public static final int STATE_SUCCESS = 4;
// 用于导出文件的目录
private TextExport mTextExport;
}
private BackupUtils(Context context) {
mTextExport = new TextExport(context);
@ -84,7 +95,7 @@ public class BackupUtils {
public String getExportedTextFileDir() {
return mTextExport.mFileDirectory;
}
// 笔记备份类
private static class TextExport {
private static final String[] NOTE_PROJECTION = {
NoteColumns.ID,
@ -92,7 +103,7 @@ public class BackupUtils {
NoteColumns.SNIPPET,
NoteColumns.TYPE
};
//定义Note数据表中各列对应的索引常量。
private static final int NOTE_COLUMN_ID = 0;
private static final int NOTE_COLUMN_MODIFIED_DATE = 1;
@ -124,28 +135,26 @@ public class BackupUtils {
private Context mContext;
private String mFileName;
private String mFileDirectory;
// 备份和恢复功能
public TextExport(Context context) {
TEXT_FORMAT = context.getResources().getStringArray(R.array.format_for_exported_note);
mContext = context;
mFileName = "";
mFileDirectory = "";
}
//同上
private String getFormat(int id) {
return TEXT_FORMAT[id];
}
/**
* Export the folder identified by folder id to text
*/
// 导出笔记到文本
private void exportFolderToText(String folderId, PrintStream ps) {
// Query notes belong to this folder
Cursor notesCursor = mContext.getContentResolver().query(Notes.CONTENT_NOTE_URI,
NOTE_PROJECTION, NoteColumns.PARENT_ID + "=?", new String[] {
folderId
}, null);
// 查询笔记
if (notesCursor != null) {
if (notesCursor.moveToFirst()) {
do {
@ -161,22 +170,21 @@ public class BackupUtils {
notesCursor.close();
}
}
/**
* Export note identified by id to a print stream
*/
// 导出笔记到文本
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);
// 查询笔记数据
if (dataCursor != null) {
if (dataCursor.moveToFirst()) {
do {
do {// 开始遍历笔记数据
// 获取当前行的MIME类型
String mimeType = dataCursor.getString(DATA_COLUMN_MIME_TYPE);
if (DataConstants.CALL_NOTE.equals(mimeType)) {
// Print phone number
// 处理电话笔记：打印电话号码、通话日期和附件位置
// 获取并打印电话号码
String phoneNumber = dataCursor.getString(DATA_COLUMN_PHONE_NUMBER);
long callDate = dataCursor.getLong(DATA_COLUMN_CALL_DATE);
String location = dataCursor.getString(DATA_COLUMN_CONTENT);
@ -185,16 +193,17 @@ public class BackupUtils {
ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT),
phoneNumber));
}
// Print call date
// 获取并打印通话日期
ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT), DateFormat
.format(mContext.getString(R.string.format_datetime_mdhm),
callDate)));
// Print call attachment location
// 获取并打印附件位置（如果存在）
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：打印笔记内容（如果非空）
String content = dataCursor.getString(DATA_COLUMN_CONTENT);
if (!TextUtils.isEmpty(content)) {
ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT),
@ -203,9 +212,11 @@ public class BackupUtils {
}
} while (dataCursor.moveToNext());
}
// 关闭数据游标
dataCursor.close();
}
// print a line separator between note
try {
ps.write(new byte[] {
Character.LINE_SEPARATOR, Character.LETTER_NUMBER
@ -214,48 +225,53 @@ public class BackupUtils {
Log.e(TAG, e.toString());
}
}
/**
* Note will be exported as text which is user readable
*/
// 导出笔记到文本
public int exportToText() {
if (!externalStorageAvailable()) {
Log.d(TAG, "Media was not mounted");
return STATE_SD_CARD_UNMOUONTED;
}
// 错误输出
PrintStream ps = getExportToTextPrintStream();
if (ps == null) {
Log.e(TAG, "get print stream error");
return STATE_SYSTEM_ERROR;
}
// First export folder and its notes
// 查询文件夹
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) {
// 遍历文件夹
if (folderCursor != null) {
if (folderCursor.moveToFirst()) {
do {
// Print folder's name
// 获取并处理当前文件夹的名称
String folderName = "";
// 判断当前文件夹是否为通话记录文件夹，据此设置不同的文件夹名称
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);
}
// 如果文件夹名称不为空，则打印到文本
if (!TextUtils.isEmpty(folderName)) {
ps.println(String.format(getFormat(FORMAT_FOLDER_NAME), folderName));
}
// 获取并导出当前文件夹的详细信息到文本
String folderId = folderCursor.getString(NOTE_COLUMN_ID);
exportFolderToText(folderId, ps);
} while (folderCursor.moveToNext());
}
// 关闭文件夹游标
folderCursor.close();
}
// Export trash folder
// Export notes in root's folder
Cursor noteCursor = mContext.getContentResolver().query(
@ -263,7 +279,7 @@ public class BackupUtils {
NOTE_PROJECTION,
NoteColumns.TYPE + "=" + +Notes.TYPE_NOTE + " AND " + NoteColumns.PARENT_ID
+ "=0", null, null);
// 遍历笔记
if (noteCursor != null) {
if (noteCursor.moveToFirst()) {
do {
@ -285,6 +301,7 @@ public class BackupUtils {
/**
* Get a print stream pointed to the file {@generateExportedTextFile}
*/
// 获取打印流
private PrintStream getExportToTextPrintStream() {
File file = generateFileMountedOnSDcard(mContext, R.string.file_path,
R.string.file_name_txt_format);
@ -294,7 +311,9 @@ public class BackupUtils {
}
mFileName = file.getName();
mFileDirectory = mContext.getString(R.string.file_path);
PrintStream ps = null;
// 创建文件输出流
try {
FileOutputStream fos = new FileOutputStream(file);
ps = new PrintStream(fos);
@ -312,6 +331,8 @@ public class BackupUtils {
/**
* Generate the text file to store imported data
*/
// 生成文件
private static File generateFileMountedOnSDcard(Context context, int filePathResId, int fileNameFormatResId) {
StringBuilder sb = new StringBuilder();
sb.append(Environment.getExternalStorageDirectory());
@ -322,21 +343,26 @@ public class BackupUtils {
DateFormat.format(context.getString(R.string.format_date_ymd),
System.currentTimeMillis())));
File file = new File(sb.toString());
try {
// 创建文件
try {
// 检查目录是否存在，不存在则创建目录
if (!filedir.exists()) {
filedir.mkdir();
}
// 检查文件是否存在，不存在则创建文件
if (!file.exists()) {
file.createNewFile();
}
return file;
} catch (SecurityException e) {
// 处理安全异常
e.printStackTrace();
} catch (IOException e) {
// 处理IO异常
e.printStackTrace();
}
// 遇到异常返回null
return null;
}
}

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