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1、BackupUtils.java
package net.micode.notes.tool;
public class BackupUtils {
private static final String TAG = "BackupUtils";
// Singleton stuff
private static BackupUtils sInstance; //类里面为什么可以定义自身类的对象？
public static synchronized BackupUtils getInstance(Context context) {
//ynchronized 关键字，代表这个方法加锁,相当于不管哪一个线程（例如线程A）
//运行到这个方法时,都要检查有没有其它线程B（或者C、 D等）正在用这个方法(或者该类的其他同步方法)，有的话要等正在使用synchronized方法的线程B（或者C 、D）运行完这个方法后再运行此线程A,没有的话,锁定调用者,然后直接运行。
//它包括两种用法：synchronized 方法和 synchronized 块。
if (sInstance == null) {
//如果当前备份不存在，则新声明一个
sInstance = new BackupUtils(context);
}
return sInstance;
}
/**
* Following states are signs to represents backup or restore
* status
*/
// Currently, the sdcard is not mounted SD卡没有被装入手机
public static final int STATE_SD_CARD_UNMOUONTED = 0;
// The backup file not exist 备份文件夹不存在
public static final int STATE_BACKUP_FILE_NOT_EXIST = 1;
// The data is not well formated, may be changed by other programs 数据已被破坏，可能被修改
public static final int STATE_DATA_DESTROIED = 2;
// Some run-time exception which causes restore or backup fails 超时异常
public static final int STATE_SYSTEM_ERROR = 3;
// Backup or restore success 成功存储
public static final int STATE_SUCCESS = 4;
private TextExport mTextExport;
private BackupUtils(Context context) { //初始化函数
mTextExport = new TextExport(context);
}
private static boolean externalStorageAvailable() { //外部存储功能是否可用
return Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState());
}
public int exportToText() {
return mTextExport.exportToText();
}
public String getExportedTextFileName() {
return mTextExport.mFileName;
}
public String getExportedTextFileDir() {
return mTextExport.mFileDirectory;
}
private static class TextExport {
private static final String[] NOTE_PROJECTION = {
NoteColumns.ID,
NoteColumns.MODIFIED_DATE,
NoteColumns.SNIPPET,
NoteColumns.TYPE
};
private static final int NOTE_COLUMN_ID = 0;
private static final int NOTE_COLUMN_MODIFIED_DATE = 1;
private static final int NOTE_COLUMN_SNIPPET = 2;
private static final String[] DATA_PROJECTION = {
DataColumns.CONTENT,
DataColumns.MIME_TYPE,
DataColumns.DATA1,
DataColumns.DATA2,
DataColumns.DATA3,
DataColumns.DATA4,
};
private static final int DATA_COLUMN_CONTENT = 0;
private static final int DATA_COLUMN_MIME_TYPE = 1;
private static final int DATA_COLUMN_CALL_DATE = 2;
private static final int DATA_COLUMN_PHONE_NUMBER = 4;
private final String [] TEXT_FORMAT;
private static final int FORMAT_FOLDER_NAME = 0;
private static final int FORMAT_NOTE_DATE = 1;
private static final int FORMAT_NOTE_CONTENT = 2;
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 = ""; //为什么为空?
mFileDirectory = "";
}
private String getFormat(int id) { //获取文本的组成部分
return TEXT_FORMAT[id];
}
/**
* Export the folder identified by folder id to text
*/
private void exportFolderToText(String folderId, PrintStream ps) {
// Query notes belong to this folder 通过查询parent id是文件夹id的note来选出制定ID文件夹下的Note
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 {
// Print note's last modified date ps里面保存有这份note的日期
ps.println(String.format(getFormat(FORMAT_NOTE_DATE), DateFormat.format(
mContext.getString(R.string.format_datetime_mdhm),
notesCursor.getLong(NOTE_COLUMN_MODIFIED_DATE))));
// Query data belong to this note
String noteId = notesCursor.getString(NOTE_COLUMN_ID);
exportNoteToText(noteId, ps); //将文件导出到text
} while (notesCursor.moveToNext());
}
notesCursor.close();
}
}
/**
* Export note identified by id to a print stream
*/
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) { //利用光标来扫描内容，区别为callnote和note两种，靠ps.printline输出
if (dataCursor.moveToFirst()) {
do {
String mimeType = dataCursor.getString(DATA_COLUMN_MIME_TYPE);
if (DataConstants.CALL_NOTE.equals(mimeType)) {
// Print phone number
String phoneNumber = dataCursor.getString(DATA_COLUMN_PHONE_NUMBER);
long callDate = dataCursor.getLong(DATA_COLUMN_CALL_DATE);
String location = dataCursor.getString(DATA_COLUMN_CONTENT);
if (!TextUtils.isEmpty(phoneNumber)) { //判断是否为空字符
ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT),
phoneNumber));
}
// Print call date
ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT), DateFormat
.format(mContext.getString(R.string.format_datetime_mdhm),
callDate)));
// Print call attachment location
if (!TextUtils.isEmpty(location)) {
ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT),
location));
}
} else if (DataConstants.NOTE.equals(mimeType)) {
String content = dataCursor.getString(DATA_COLUMN_CONTENT);
if (!TextUtils.isEmpty(content)) {
ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT),
content));
}
}
} while (dataCursor.moveToNext());
}
dataCursor.close();
}
// print a line separator between note
try {
ps.write(new byte[] {
Character.LINE_SEPARATOR, Character.LETTER_NUMBER
});
} catch (IOException e) {
Log.e(TAG, e.toString());
}
}
/**
* Note will be exported as text which is user readable
*/
public int exportToText() { //总函数，调用上面的exportFolder和exportNote
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;
}
// First export folder and its notes 导出文件夹，就是导出里面包含的便签
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 {
// Print folder's name
String folderName = "";
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);
}
if (!TextUtils.isEmpty(folderName)) {
ps.println(String.format(getFormat(FORMAT_FOLDER_NAME), folderName));
}
String folderId = folderCursor.getString(NOTE_COLUMN_ID);
exportFolderToText(folderId, ps);
} while (folderCursor.moveToNext());
}
folderCursor.close();
}
// Export notes in root's folder 将根目录里的便签导出（由于不属于任何文件夹，因此无法通过文件夹导出来实现这一部分便签的导出）
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(FORMAT_NOTE_DATE), DateFormat.format(
mContext.getString(R.string.format_datetime_mdhm),
noteCursor.getLong(NOTE_COLUMN_MODIFIED_DATE))));
// Query data belong to this note
String noteId = noteCursor.getString(NOTE_COLUMN_ID);
exportNoteToText(noteId, ps);
} while (noteCursor.moveToNext());
}
noteCursor.close();
}
ps.close();
return STATE_SUCCESS;
}
/**
* Get a print stream pointed to the file {@generateExportedTextFile}
*/
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); //将ps输出流输出到特定的文件，目的就是导出到文件，而不是直接输出
} catch (FileNotFoundException e) {
e.printStackTrace();
return null;
} catch (NullPointerException e) {
e.printStackTrace();
return null;
}
return ps;
}
}
/**
* Generate the text file to store imported data
*/
private static File generateFileMountedOnSDcard(Context context, int filePathResId, int fileNameFormatResId) {
StringBuilder sb = new StringBuilder();
sb.append(Environment.getExternalStorageDirectory()); //外部（SD卡）的存储路径
sb.append(context.getString(filePathResId)); //文件的存储路径
File filedir = new File(sb.toString()); //filedir应该就是用来存储路径信息
sb.append(context.getString(
fileNameFormatResId,
DateFormat.format(context.getString(R.string.format_date_ymd),
System.currentTimeMillis())));
File file = new File(sb.toString());
try { //如果这些文件不存在，则新建
if (!filedir.exists()) {
filedir.mkdir();
}
if (!file.exists()) {
file.createNewFile();
}
return file;
} catch (SecurityException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// try catch 异常处理
return null;
}
}
2、DataUtils.java、
package net.micode.notes.tool;
public class DataUtils {
public static final String TAG = "DataUtils";
public static boolean batchDeleteNotes(ContentResolver resolver, HashSet<Long> ids) { //直接删除多个笔记
if (ids == null) {
Log.d(TAG, "the ids is null");
return true;
}
if (ids.size() == 0) {
Log.d(TAG, "no id is in the hashset");
return true;
}
ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>(); //提供一个任务列表
for (long id : ids) {
if(id == Notes.ID_ROOT_FOLDER) {
Log.e(TAG, "Don't delete system folder root");
continue;
} //如果发现是根文件夹，则不删除
ContentProviderOperation.Builder builder = ContentProviderOperation
.newDelete(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id)); //用newDelete实现删除功能
operationList.add(builder.build()); //
}
try {
ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList);//主机名（或叫Authority）用于唯一标识这个ContentProvider，外部调用者可以根据这个标识来找到它。
//数据库事务，数据库事务是由一组数据库操作序列组成，事务作为一个整体被执行
if (results == null || results.length == 0 || results[0] == null) {
Log.d(TAG, "delete notes failed, ids:" + ids.toString());
return false;
}
return true;
} catch (RemoteException e) {
Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
} catch (OperationApplicationException e) {
Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
}
return false;
}
public static void moveNoteToFoler(ContentResolver resolver, long id, long srcFolderId, long desFolderId) {
ContentValues values = new ContentValues();
values.put(NoteColumns.PARENT_ID, desFolderId);
values.put(NoteColumns.ORIGIN_PARENT_ID, srcFolderId);
values.put(NoteColumns.LOCAL_MODIFIED, 1);
resolver.update(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id), values, null, null); //对需要移动的便签进行数据更新，然后用update实现
}
public static boolean batchMoveToFolder(ContentResolver resolver, HashSet<Long> ids,
long folderId) {
if (ids == null) {
Log.d(TAG, "the ids is null");
return true;
}
ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>();
for (long id : ids) {
ContentProviderOperation.Builder builder = ContentProviderOperation
.newUpdate(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, id)); //通过withAppendedId方法，为该Uri加上ID
builder.withValue(NoteColumns.PARENT_ID, folderId);
builder.withValue(NoteColumns.LOCAL_MODIFIED, 1);
operationList.add(builder.build());
}//将ids里包含的每一列的数据逐次加入到operationList中，等待最后的批量处理
try {
ContentProviderResult[] results = resolver.applyBatch(Notes.AUTHORITY, operationList); //applyBatch一次性处理一个操作列表
if (results == null || results.length == 0 || results[0] == null) {
Log.d(TAG, "delete notes failed, ids:" + ids.toString());
return false;
}
return true;
} catch (RemoteException e) {
Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
} catch (OperationApplicationException e) {
Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
}
return false;
}
/**
* Get the all folder count except system folders {@link Notes#TYPE_SYSTEM}}
*/
public static int getUserFolderCount(ContentResolver resolver) {
Cursor cursor =resolver.query(Notes.CONTENT_NOTE_URI,
new String[] { "COUNT(*)" },
NoteColumns.TYPE + "=? AND " + NoteColumns.PARENT_ID + "<>?",
new String[] { String.valueOf(Notes.TYPE_FOLDER), String.valueOf(Notes.ID_TRASH_FOLER)},
null); //筛选条件：源文件不为trash folder
int count = 0;
if(cursor != null) {
if(cursor.moveToFirst()) {
try {
count = cursor.getInt(0);
} catch (IndexOutOfBoundsException e) {
Log.e(TAG, "get folder count failed:" + e.toString());
} finally {
cursor.close();
}
}
}
return count;
}
public static boolean visibleInNoteDatabase(ContentResolver resolver, long noteId, int type) {
Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), //通过withAppendedId方法，为该Uri加上ID
null,
NoteColumns.TYPE + "=? AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER,
new String [] {String.valueOf(type)},
null); //查询条件：type符合，且不属于垃圾文件夹
boolean exist = false;
if (cursor != null) {
if (cursor.getCount() > 0) {//用getcount函数判断cursor是否为空
exist = true;
}
cursor.close();
}
return exist;
}
public static boolean existInNoteDatabase(ContentResolver resolver, long noteId) {
Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId),
null, null, null, null);
boolean exist = false;
if (cursor != null) {
if (cursor.getCount() > 0) {
exist = true;
}
cursor.close();
}
return exist;
}
public static boolean existInDataDatabase(ContentResolver resolver, long dataId) {
Cursor cursor = resolver.query(ContentUris.withAppendedId(Notes.CONTENT_DATA_URI, dataId),
null, null, null, null);
boolean exist = false;
if (cursor != null) {
if (cursor.getCount() > 0) {
exist = true;
}
cursor.close();
}
return exist;
}
public static boolean checkVisibleFolderName(ContentResolver resolver, String name) {
Cursor cursor = resolver.query(Notes.CONTENT_NOTE_URI, null,
NoteColumns.TYPE + "=" + Notes.TYPE_FOLDER +
" AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER +
" AND " + NoteColumns.SNIPPET + "=?",
new String[] { name }, null);
//通过名字查询文件是否存在
boolean exist = false;
if(cursor != null) {
if(cursor.getCount() > 0) {
exist = true;
}
cursor.close();
}
return exist;
}
public static HashSet<AppWidgetAttribute> getFolderNoteWidget(ContentResolver resolver, long folderId) {
Cursor c = resolver.query(Notes.CONTENT_NOTE_URI,
new String[] { NoteColumns.WIDGET_ID, NoteColumns.WIDGET_TYPE },
NoteColumns.PARENT_ID + "=?",
new String[] { String.valueOf(folderId) },
null); //查询条件：父ID是传入的folderId;
HashSet<AppWidgetAttribute> set = null;
if (c != null) {
if (c.moveToFirst()) {
set = new HashSet<AppWidgetAttribute>();
do {
try {
AppWidgetAttribute widget = new AppWidgetAttribute();
widget.widgetId = c.getInt(0); //0对应的NoteColumns.WIDGET_ID
widget.widgetType = c.getInt(1); //1对应的NoteColumns.WIDGET_TYPE
set.add(widget);
} catch (IndexOutOfBoundsException e) {
Log.e(TAG, e.toString());
}
} while (c.moveToNext()); //查询下一条
}
c.close();
}
return set;
}
public static String getCallNumberByNoteId(ContentResolver resolver, long noteId) {
Cursor cursor = resolver.query(Notes.CONTENT_DATA_URI,
new String [] { CallNote.PHONE_NUMBER },
CallNote.NOTE_ID + "=? AND " + CallNote.MIME_TYPE + "=?",
new String [] { String.valueOf(noteId), CallNote.CONTENT_ITEM_TYPE },
null);
if (cursor != null && cursor.moveToFirst()) {
try {
return cursor.getString(0);
} catch (IndexOutOfBoundsException e) {
Log.e(TAG, "Get call number fails " + e.toString());
} finally {
cursor.close();
}
}
return "";
}
public static long getNoteIdByPhoneNumberAndCallDate(ContentResolver resolver, String phoneNumber, long callDate) {
Cursor cursor = resolver.query(Notes.CONTENT_DATA_URI,
new String [] { CallNote.NOTE_ID },
CallNote.CALL_DATE + "=? AND " + CallNote.MIME_TYPE + "=? AND PHONE_NUMBERS_EQUAL("
+ CallNote.PHONE_NUMBER + ",?)",
new String [] { String.valueOf(callDate), CallNote.CONTENT_ITEM_TYPE, phoneNumber },
null);
//通过数据库操作，查询条件是（callDate和phoneNumber匹配传入参数的值）
if (cursor != null) {
if (cursor.moveToFirst()) {
try {
return cursor.getLong(0); //0对应的CallNote.NOTE_ID
} catch (IndexOutOfBoundsException e) {
Log.e(TAG, "Get call note id fails " + e.toString());
}
}
cursor.close();
}
return 0;
}
public static String getSnippetById(ContentResolver resolver, long noteId) {
Cursor cursor = resolver.query(Notes.CONTENT_NOTE_URI,
new String [] { NoteColumns.SNIPPET },
NoteColumns.ID + "=?",
new String [] { String.valueOf(noteId)},
null);//查询条件：noteId
if (cursor != null) {
String snippet = "";
if (cursor.moveToFirst()) {
snippet = cursor.getString(0);
}
cursor.close();
return snippet;
}
throw new IllegalArgumentException("Note is not found with id: " + noteId);
}
public static String getFormattedSnippet(String snippet) { //对字符串进行格式处理，将字符串两头的空格去掉，同时将换行符去掉
if (snippet != null) {
snippet = snippet.trim();
int index = snippet.indexOf('\n');
if (index != -1) {
snippet = snippet.substring(0, index);
}
}
return snippet;
}
}
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