How to export data from SQLite into excel in android?

I am trying to export data from SqLite DB to excel file. I want to save it to sd card. I am trying the following code and the file is not generating. Although through the file manager I am able to see the file but while connecting it through USB cable I am not find the folder in my PC.

i am using jxl.jar lib

final String fileName = "Userlist.xls";

    //Saving file in external storage
    File sdCard = Environment.getExternalStorageDirectory();

    File directory = new File(sdCard.getAbsolutePath() + "/My sheet");

    //create directory if not exist
    if(!directory.isDirectory()){
        directory.mkdirs(); 
    }

    //file path
    File file = new File(directory, fileName);

    WorkbookSettings wbSettings = new WorkbookSettings();
    wbSettings.setLocale(new Locale("en", "EN"));

    WritableWorkbook workbook;

    try {
        workbook = Workbook.createWorkbook(file, wbSettings);

        //Excel sheet name. 0 represents first sheet
        WritableSheet sheet = workbook.createSheet("MyUserList", 0);

        try {
            sheet.addCell(new Label(0, 0, "Contact")); // column and row
            sheet.addCell(new Label(1, 0, "Name"));
            sheet.addCell(new Label(2, 0, "Age"));

            if (cursor.moveToFirst()) {
                do {
                    String contact = cursor.getString(cursor.getColumnIndex(DatabaseHandler.USERPHONE));
                    String name = cursor.getString(cursor.getColumnIndex(DatabaseHandler.USERNAME));
                    String age = cursor.getString(cursor.getColumnIndex(DatabaseHandler.USERAGE));

                    int i = cursor.getPosition() + 1;

                    sheet.addCell(new Label(0, i, contact));
                    sheet.addCell(new Label(1, i, name));
                    sheet.addCell(new Label(2, i, age));
                } while (cursor.moveToNext());
            }

            //closing cursor
            cursor.close();

        } catch (RowsExceededException e) {
            e.printStackTrace();
        } catch (WriteException e) {
            e.printStackTrace();
        }

        workbook.write();

        try {
            workbook.close();
        } catch (WriteException e) {
            e.printStackTrace();
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
}