备份和恢复 SQLite 数据库到 sdcard [英] Backup and restore SQLite database to sdcard

问题描述

如何在我的应用程序中自动将我的数据库备份到 SD 卡?之后，我如何恢复它?

How can I backup my database to the sdcard automatically in my app? And afterward, how do I restore it?

推荐答案

这是我的代码:

    // Local database
    InputStream input = new FileInputStream(from);

    // create directory for backup
    File dir = new File(DB_BACKUP_PATH);
    dir.mkdir();

    // Path to the external backup
    OutputStream output = new FileOutputStream(to);

    // transfer bytes from the Input File to the Output File
    byte[] buffer = new byte[1024];
    int length;
    while ((length = input.read(buffer))>0) {
        output.write(buffer, 0, length);
    }

    output.flush();
    output.close();
    input.close();

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