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package net.micode.notes.tool;
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// 导入必要的类
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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 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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// 备份工具类
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public class BackupUtils {
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private static final String TAG = "BackupUtils";
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// 单例实例
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private static BackupUtils sInstance;
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// 获取实例的静态方法，确保在整个应用程序中只有一个实例存在
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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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// 数据导出类
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private TextExport mTextExport;
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// 私有构造函数
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private BackupUtils(Context context) {
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mTextExport = new TextExport(context);
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}
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// 检查外部存储是否可用
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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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// 导出数据到文本文件
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public int exportToText() {
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return mTextExport.exportToText();
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}
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// 获取导出的文本文件名
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public String getExportedTextFileName() {
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return mTextExport.mFileName;
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}
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// 获取导出的文本文件目录
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public String getExportedTextFileDir() {
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return mTextExport.mFileDirectory;
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}
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// 内部私有类，负责文本导出功能
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private static class TextExport {
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// 笔记和数据表的投影
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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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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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// 笔记和数据表的列索引
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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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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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// 文本格式数组
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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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// 上下文和文件名变量
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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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// 构造函数
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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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// 获取文本格式字符串
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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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// 导出文件夹到文本
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private void exportFolderToText(String folderId, PrintStream ps) {
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// 查询文件夹下的笔记
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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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// 如果存在笔记，则导出
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if (notesCursor != null) {
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if (notesCursor.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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notesCursor.getLong(NOTE_COLUMN_MODIFIED_DATE))));
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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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// 导出笔记到文本
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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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// 导出笔记内容
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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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// 导出电话笔记内容
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// ...
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} else if (DataConstants.NOTE.equals(mimeType)) {
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// 导出普通笔记内容
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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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}
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// 导出到文本文件的主方法
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public int exportToText() {
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// 检查外部存储是否可用
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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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// 获取文本文件打印流
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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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// 导出文件夹和笔记到文本文件
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// ...
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return STATE_SUCCESS;
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}
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// 获取导出到文本文件的打印流
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private PrintStream getExportToTextPrintStream() {
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// 生成文件
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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, "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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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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// 导出状态常量
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public static final int STATE_SD_CARD_UNMOUONTED = 0;
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public static final int STATE_SUCCESS = 4;
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public static final int STATE_SYSTEM_ERROR = 3;
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// 构造导出工具
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public BackupUtils(Context context) {
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mTextExport = new TextExport(context);
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}
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// 外部存储是否可用
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private static boolean externalStorageAvailable
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// 外部存储是否可用
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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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// 生成文件存储在SD卡上
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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()); // 获取SD卡路径
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sb.append(context.getString(filePathResId)); // 获取文件路径
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File filedir = new File(sb.toString()); // 创建文件路径对象
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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(); // 如果路径不存在，则创建路径
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}
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if (!file.exists()) {
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file.createNewFile(); // 如果文件不存在，则创建文件
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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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