// For complete examples and data files, please go to https://github.com/aspose-cells/Aspose.Cells-for-Android
try {
    String root = Environment.getExternalStorageDirectory().toString();
    File myDir = new File(root + File.separator + "Aspose");
    String filePath = myDir.getCanonicalPath();

    Workbook workbook = new Workbook(filePath + File.separator + "Book1.xlsx");

    //Save in default (Excel2003) format
    workbook.save(filePath + File.separator + "book_out.xls");

    //Save in Excel2003 format
    workbook.save(filePath + File.separator + "book_out.xls", FileFormatType.EXCEL_97_TO_2003);

    //Save in Excel2007 xlsx format
    workbook.save(filePath + File.separator + "book_out.xlsx", FileFormatType.XLSX);

    //Save in SpreadsheetML format
    workbook.save(filePath + File.separator + "book_out.xml", FileFormatType.EXCEL_2003_XML);

} catch (Exception e) {
    Log.e(TAG, "Save to a location", e);
}