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@ -37,123 +37,190 @@ import java.io.PrintStream;
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public class BackupUtils {
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/**
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* 这是一个工具类,用于备份和恢复数据。
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*/
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private static final String TAG = "BackupUtils";
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// Singleton stuff
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/**
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* 单例模式,用于确保BackupUtils类只有一个实例。
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*/
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private static BackupUtils sInstance;
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/**
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* 获取BackupUtils类的单例对象。
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* @param context 上下文对象,用于访问应用的资源和类。
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* @return BackupUtils类的单例对象。
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*/
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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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sInstance = new BackupUtils(context); // 如果实例不存在,则创建一个新的实例。
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}
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return sInstance;
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return sInstance; // 返回单例对象。
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}
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/**
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* Following states are signs to represents backup or restore
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* status
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* 定义备份或恢复状态的常量。
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*/
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// Currently, the sdcard is not mounted
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public static final int STATE_SD_CARD_UNMOUONTED = 0;
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public static final int STATE_SD_CARD_UNMOUONTED = 0; // SD卡未挂载。
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// The backup file not exist
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public static final int STATE_BACKUP_FILE_NOT_EXIST = 1;
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public static final int STATE_BACKUP_FILE_NOT_EXIST = 1; // 备份文件不存在。
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// The data is not well formated, may be changed by other programs
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public static final int STATE_DATA_DESTROIED = 2;
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public static final int STATE_DATA_DESTROIED = 2; // 数据格式不正确,可能被其他程序修改。
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// Some run-time exception which causes restore or backup fails
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public static final int STATE_SYSTEM_ERROR = 3;
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public static final int STATE_SYSTEM_ERROR = 3; // 运行时异常导致备份或恢复失败。
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// Backup or restore success
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public static final int STATE_SUCCESS = 4;
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public static final int STATE_SUCCESS = 4; // 备份或恢复成功。
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/**
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* TextExport类的实例,用于将数据导出为文本。
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*/
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private TextExport mTextExport;
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/**
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* BackupUtils类的构造函数。
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* @param context 上下文对象,用于访问应用的资源和类。
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*/
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private BackupUtils(Context context) {
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mTextExport = new TextExport(context);
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mTextExport = new TextExport(context); // 初始化TextExport对象。
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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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* @return 如果外部存储可用,返回true;否则返回false。
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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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return Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState()); // 检查外部存储状态是否为已挂载。
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}
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/**
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* 导出数据为文本。
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* @return 返回导出操作的状态码。
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*/
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public int exportToText() {
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return mTextExport.exportToText();
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return mTextExport.exportToText(); // 调用TextExport对象的exportToText方法。
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}
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/**
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* 获取导出文本文件的文件名。
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* @return 返回导出文本文件的文件名。
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*/
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public String getExportedTextFileName() {
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return mTextExport.mFileName;
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return mTextExport.mFileName; // 返回TextExport对象的文件名。
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}
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/**
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* 获取导出文本文件的目录。
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* @return 返回导出文本文件的目录。
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*/
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public String getExportedTextFileDir() {
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return mTextExport.mFileDirectory;
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return mTextExport.mFileDirectory; // 返回TextExport对象的文件目录。
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}
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/**
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* 私有静态内部类,用于将数据导出为文本格式。
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*/
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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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/**
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* 定义查询笔记时需要的列。
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*/
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private static final String[] NOTE_PROJECTION = {
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NoteColumns.ID, // 笔记ID
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NoteColumns.MODIFIED_DATE, // 最后修改日期
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NoteColumns.SNIPPET, // 笔记摘要
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NoteColumns.TYPE // 笔记类型
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};
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private static final int DATA_COLUMN_MIME_TYPE = 1;
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/**
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* 定义NOTE_PROJECTION数组中各列的索引。
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*/
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private static final int NOTE_COLUMN_ID = 0; // 笔记ID列索引
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private static final int NOTE_COLUMN_MODIFIED_DATE = 1; // 最后修改日期列索引
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private static final int NOTE_COLUMN_SNIPPET = 2; // 笔记摘要列索引
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private static final int NOTE_COLUMN_TYPE = 3; // 笔记类型列索引
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private static final int DATA_COLUMN_CALL_DATE = 2;
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/**
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* 定义查询数据时需要的列。
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*/
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private static final String[] DATA_PROJECTION = {
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DataColumns.CONTENT, // 数据内容
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DataColumns.MIME_TYPE, // 数据MIME类型
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DataColumns.DATA1, // 数据字段1
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DataColumns.DATA2, // 数据字段2
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DataColumns.DATA3, // 数据字段3
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DataColumns.DATA4 // 数据字段4
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};
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private static final int DATA_COLUMN_PHONE_NUMBER = 4;
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/**
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* 定义DATA_PROJECTION数组中各列的索引。
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*/
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private static final int DATA_COLUMN_CONTENT = 0; // 数据内容列索引
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private static final int DATA_COLUMN_MIME_TYPE = 1; // 数据MIME类型列索引
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private static final int DATA_COLUMN_CALL_DATE = 2; // 通话日期列索引(注意:这里应该是DATA3,因为DATA2和DATA3的索引被占用了)
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private static final int DATA_COLUMN_PHONE_NUMBER = 4; // 电话号码列索引(注意:这里应该是DATA4,因为DATA4的索引被占用了)
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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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/**
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* 定义导出文本的格式。
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*/
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private final String[] TEXT_FORMAT; // 导出文本的格式数组
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private static final int FORMAT_FOLDER_NAME = 0; // 文件夹名称格式索引
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private static final int FORMAT_NOTE_DATE = 1; // 笔记日期格式索引
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private static final int FORMAT_NOTE_CONTENT = 2; // 笔记内容格式索引
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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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/**
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* 上下文对象,用于访问应用的资源和类。
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*/
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private Context mContext;
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/**
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* 导出文本文件的文件名。
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*/
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private String mFileName;
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/**
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* 导出文本文件的目录。
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*/
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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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/**
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* TextExport类的构造函数。
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* @param context 上下文对象,用于访问应用的资源和类。
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*/
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public TextExport(Context context) {
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TEXT_FORMAT = context.getResources().getStringArray(R.array.format_for_exported_note); // 从资源文件中获取导出文本的格式
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mContext = context; // 初始化上下文对象
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mFileName = ""; // 初始化文件名为空
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mFileDirectory = ""; // 初始化文件目录为空
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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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* 根据ID获取对应的格式字符串。
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* @param id 格式ID。
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* @return 返回对应的格式字符串。
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*/
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private String getFormat(int id) {
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return TEXT_FORMAT[id]; // 返回TEXT_FORMAT数组中对应ID的格式字符串
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}
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}
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/**
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* Export the folder identified by folder id to text
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*/
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private void exportFolderToText(String folderId, PrintStream ps) {
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// Query notes belong to this folder
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// 查询属于该文件夹的笔记
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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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// Print note's last modified date
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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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// Query data belong to this note
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// 查询属于该笔记的数据
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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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@ -161,35 +228,37 @@ public class BackupUtils {
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notesCursor.close();
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}
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}
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/**
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* Export note identified by id to a print stream
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* 将指定ID的笔记导出到PrintStream。
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* @param noteId 笔记ID。
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* @param ps PrintStream对象,用于输出文本数据。
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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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// Print phone number
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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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// Print call date
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// 打印通话日期
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ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT), DateFormat
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.format(mContext.getString(R.string.format_datetime_mdhm),
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callDate)));
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// Print call attachment location
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// 打印通话附件位置
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if (!TextUtils.isEmpty(location)) {
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ps.println(String.format(getFormat(FORMAT_NOTE_CONTENT),
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location));
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@ -205,7 +274,7 @@ public class BackupUtils {
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}
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dataCursor.close();
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}
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// print a line separator between note
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// 在笔记之间打印一个分隔符
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try {
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ps.write(new byte[] {
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Character.LINE_SEPARATOR, Character.LETTER_NUMBER
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@ -219,126 +288,129 @@ public class BackupUtils {
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* Note will be exported as text which is user readable
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*/
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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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|
Log.d(TAG, "Media was not mounted"); // 如果外部存储不可用,则记录日志
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return STATE_SD_CARD_UNMOUONTED; // 返回SD卡未挂载的状态码
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}
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// 获取用于导出文本的PrintStream对象
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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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Log.e(TAG, "get print stream error"); // 如果获取PrintStream失败,则记录错误日志
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return STATE_SYSTEM_ERROR; // 返回系统错误的状态码
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}
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// First export folder and its notes
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// 首先导出文件夹及其笔记
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Cursor folderCursor = 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_FOLDER + " AND "
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+ NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER + ") OR "
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+ NoteColumns.ID + "=" + Notes.ID_CALL_RECORD_FOLDER, null, null);
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Notes.CONTENT_NOTE_URI, // 笔记内容URI
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NOTE_PROJECTION, // 查询需要的列
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"(" + NoteColumns.TYPE + "=" + Notes.TYPE_FOLDER + " AND " + NoteColumns.PARENT_ID + "<>" + Notes.ID_TRASH_FOLER + ") OR "
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+ NoteColumns.ID + "=" + Notes.ID_CALL_RECORD_FOLDER, // 查询条件
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null, // 查询参数
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|
null); // 排序参数
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|
|
if (folderCursor != null) {
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|
if (folderCursor.moveToFirst()) {
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do {
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// Print folder's name
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|
// 打印文件夹名称
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|
String folderName = "";
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|
if(folderCursor.getLong(NOTE_COLUMN_ID) == Notes.ID_CALL_RECORD_FOLDER) {
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|
folderName = mContext.getString(R.string.call_record_folder_name);
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folderName = mContext.getString(R.string.call_record_folder_name); // 获取通话记录文件夹名称
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|
} else {
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|
|
folderName = folderCursor.getString(NOTE_COLUMN_SNIPPET);
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|
folderName = folderCursor.getString(NOTE_COLUMN_SNIPPET); // 获取普通文件夹名称
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|
|
}
|
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|
|
if (!TextUtils.isEmpty(folderName)) {
|
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|
ps.println(String.format(getFormat(FORMAT_FOLDER_NAME), folderName));
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|
|
ps.println(String.format(getFormat(FORMAT_FOLDER_NAME), folderName)); // 按照格式打印文件夹名称
|
|
|
|
|
}
|
|
|
|
|
String folderId = folderCursor.getString(NOTE_COLUMN_ID);
|
|
|
|
|
exportFolderToText(folderId, ps);
|
|
|
|
|
exportFolderToText(folderId, ps); // 导出文件夹内容
|
|
|
|
|
} while (folderCursor.moveToNext());
|
|
|
|
|
}
|
|
|
|
|
folderCursor.close();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// Export notes in root's folder
|
|
|
|
|
|
|
|
|
|
// 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);
|
|
|
|
|
|
|
|
|
|
Notes.CONTENT_NOTE_URI, // 笔记内容URI
|
|
|
|
|
NOTE_PROJECTION, // 查询需要的列
|
|
|
|
|
NoteColumns.TYPE + "=" + Notes.TYPE_NOTE + " AND " + NoteColumns.PARENT_ID + "=0", // 查询条件,选择根文件夹中的笔记
|
|
|
|
|
null, // 查询参数
|
|
|
|
|
null); // 排序参数
|
|
|
|
|
|
|
|
|
|
if (noteCursor != null) {
|
|
|
|
|
if (noteCursor.moveToFirst()) {
|
|
|
|
|
do {
|
|
|
|
|
ps.println(String.format(getFormat(FORMAT_NOTE_DATE), DateFormat.format(
|
|
|
|
|
mContext.getString(R.string.format_datetime_mdhm),
|
|
|
|
|
mContext.getString(R.string.format_datetime_mdhm), // 格式化笔记最后修改日期
|
|
|
|
|
noteCursor.getLong(NOTE_COLUMN_MODIFIED_DATE))));
|
|
|
|
|
// Query data belong to this note
|
|
|
|
|
// 查询属于该笔记的数据
|
|
|
|
|
String noteId = noteCursor.getString(NOTE_COLUMN_ID);
|
|
|
|
|
exportNoteToText(noteId, ps);
|
|
|
|
|
exportNoteToText(noteId, ps); // 导出笔记内容
|
|
|
|
|
} while (noteCursor.moveToNext());
|
|
|
|
|
}
|
|
|
|
|
noteCursor.close();
|
|
|
|
|
}
|
|
|
|
|
ps.close();
|
|
|
|
|
|
|
|
|
|
return STATE_SUCCESS;
|
|
|
|
|
ps.close(); // 关闭PrintStream对象
|
|
|
|
|
|
|
|
|
|
return STATE_SUCCESS; // 返回成功的状态码
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* Get a print stream pointed to the file {@generateExportedTextFile}
|
|
|
|
|
*/
|
|
|
|
|
private PrintStream getExportToTextPrintStream() {
|
|
|
|
|
// 在SD卡上生成用于导出的文件
|
|
|
|
|
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;
|
|
|
|
|
Log.e(TAG, "create file to exported failed"); // 如果文件创建失败,则记录错误日志
|
|
|
|
|
return null; // 返回null
|
|
|
|
|
}
|
|
|
|
|
mFileName = file.getName();
|
|
|
|
|
mFileDirectory = mContext.getString(R.string.file_path);
|
|
|
|
|
PrintStream ps = null;
|
|
|
|
|
mFileName = file.getName(); // 设置导出文件的文件名
|
|
|
|
|
mFileDirectory = mContext.getString(R.string.file_path); // 设置导出文件的目录
|
|
|
|
|
PrintStream ps = null; // 初始化PrintStream对象
|
|
|
|
|
try {
|
|
|
|
|
FileOutputStream fos = new FileOutputStream(file);
|
|
|
|
|
ps = new PrintStream(fos);
|
|
|
|
|
FileOutputStream fos = new FileOutputStream(file); // 创建文件输出流
|
|
|
|
|
ps = new PrintStream(fos); // 创建PrintStream对象
|
|
|
|
|
} catch (FileNotFoundException e) {
|
|
|
|
|
e.printStackTrace();
|
|
|
|
|
return null;
|
|
|
|
|
e.printStackTrace(); // 如果发生文件未找到异常,则打印堆栈跟踪
|
|
|
|
|
return null; // 返回null
|
|
|
|
|
} catch (NullPointerException e) {
|
|
|
|
|
e.printStackTrace();
|
|
|
|
|
return null;
|
|
|
|
|
e.printStackTrace(); // 如果发生空指针异常,则打印堆栈跟踪
|
|
|
|
|
return null; // 返回null
|
|
|
|
|
}
|
|
|
|
|
return ps;
|
|
|
|
|
return ps; // 返回PrintStream对象
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 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());
|
|
|
|
|
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();
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 在SD卡上生成用于存储导入数据的文本文件。
|
|
|
|
|
*/
|
|
|
|
|
private static File generateFileMountedOnSDcard(Context context, int filePathResId, int fileNameFormatResId) {
|
|
|
|
|
StringBuilder sb = new StringBuilder(); // 初始化StringBuilder对象
|
|
|
|
|
sb.append(Environment.getExternalStorageDirectory()); // 追加外部存储目录
|
|
|
|
|
sb.append(context.getString(filePathResId)); // 追加文件路径
|
|
|
|
|
File filedir = new File(sb.toString()); // 创建文件目录对象
|
|
|
|
|
sb.append(context.getString( // 追加文件名
|
|
|
|
|
fileNameFormatResId,
|
|
|
|
|
DateFormat.format(context.getString(R.string.format_date_ymd), // 使用日期格式化文件名
|
|
|
|
|
System.currentTimeMillis()))); // 使用当前时间戳
|
|
|
|
|
File file = new File(sb.toString()); // 创建文件对象
|
|
|
|
|
|
|
|
|
|
try {
|
|
|
|
|
if (!filedir.exists()) { // 如果文件目录不存在,则创建目录
|
|
|
|
|
filedir.mkdir();
|
|
|
|
|
}
|
|
|
|
|
if (!file.exists()) { // 如果文件不存在,则创建文件
|
|
|
|
|
file.createNewFile();
|
|
|
|
|
}
|
|
|
|
|
return file; // 返回文件对象
|
|
|
|
|
} catch (SecurityException e) {
|
|
|
|
|
e.printStackTrace(); // 如果发生安全异常,则打印堆栈跟踪
|
|
|
|
|
} catch (IOException e) {
|
|
|
|
|
e.printStackTrace(); // 如果发生IO异常,则打印堆栈跟踪
|
|
|
|
|
}
|
|
|
|
|
return file;
|
|
|
|
|
} catch (SecurityException e) {
|
|
|
|
|
e.printStackTrace();
|
|
|
|
|
} catch (IOException e) {
|
|
|
|
|
e.printStackTrace();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return null;
|
|
|
|
|
|
|
|
|
|
return null; // 如果发生异常,则返回null
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|