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王希宁 2023317170
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public class BackupUtils {
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private static final String TAG = "BackupUtils";
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// 单例模式相关
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private static BackupUtils sInstance;
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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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* 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_UNMOUNTED = 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_DESTROYED = 2;
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// 由于运行时异常导致恢复或备份失败
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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;
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private BackupUtils(Context context) {
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mTextExport = new TextExport(context);
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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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public int exportToText() {
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return mTextExport.exportToText();
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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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public String getExportedTextFileDir() {
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return mTextExport.mFileDirectory;
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}
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}
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``````java
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private static class TextExport {
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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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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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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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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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private final String[] TEXT_FORMAT;
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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;
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private String mFileName;
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private String mFileDirectory;
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public TextExport(Context context) {
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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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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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* 将由文件夹ID标识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);
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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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``````java
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}
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folderCursor.close();
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}
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// 关闭游标
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folderCursor.close();
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}
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return STATE_SUCCESS;
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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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*/
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private boolean externalStorageAvailable() {
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String state = Environment.getExternalStorageState();
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return Environment.MEDIA_MOUNTED.equals(state);
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}
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/**
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* 获取导出到文本的打印流
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*/
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private PrintStream getExportToTextPrintStream() {
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try {
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File exportFile = new File(mFileDirectory, mFileName);
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FileOutputStream fileOutputStream = new FileOutputStream(exportFile);
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return new PrintStream(fileOutputStream);
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} catch (FileNotFoundException e) {
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Log.e(TAG, e.toString());
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return null;
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}
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}
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/**
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* 导出文件夹和其笔记到文本
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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);
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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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* 导出由id标识的笔记到打印流
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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
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```java
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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);
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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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* 获取指向文件{@generateExportedTextFile}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, "创建要导出的文件失败");
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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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PrintStream ps = null;
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try {
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FileOutputStream fos = new FileOutputStream(file);
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ps = 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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return ps;
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}
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}
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/**
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* 生成文本文件以存储导入的数据
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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();
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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(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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if (!filedir.exists()) {
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filedir.mkdir();
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}
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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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}
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``` |
