无法在SD卡上看到sqlite文件

Question

我的问题如下： 我已经在本地SD上正确移动了SQlite数据库，但是通过USB连接从设备和PC都看不到该文件。 该应用程序不会引发任何错误。 以下是执行复制的方法： private void exportDB（）{

    DBHelper db = DBHelper.getInstance(this);
    String DBName = db.getDBName();
    File dbPath = this.getDatabasePath(DBName);
    String DBPath = dbPath.getAbsolutePath();
    //Toast.makeText(this, "DB Path : " + DBPath , Toast.LENGTH_LONG).show();


    File sd = Environment.getExternalStorageDirectory();
    File data = Environment.getDataDirectory();
    FileChannel source=null;
    FileChannel destination=null;
    String currentDBPath = DBPath;
    String backupDBPath = "Download/"+DBName;
    File currentDB = new File(currentDBPath);
    File backupDB = new File(sd, backupDBPath);
    try {
        source = new FileInputStream(currentDB).getChannel();
        destination = new FileOutputStream(backupDB).getChannel();
        destination.transferFrom(source, 0, source.size());
        source.close();

        destination.close();
        Toast.makeText(this, "DB Exported!", Toast.LENGTH_LONG).show();
    } catch(FileNotFoundException e) {
        e.printStackTrace();
    }catch(IOException e) {
        e.printStackTrace();
    }


}

Answer 1

对于转移DB，我认为它可以在root设备中实现。