java - 手机sd卡连接电脑看不到文件

Question

我从 android 创建了一个 excel 文件，当我将手机连接到计算机时，然后在计算机中我无法看到该文件。这是为什么？

    Workbook wb = new HSSFWorkbook();
    Cell c = null;

    //Cell style for header row
    CellStyle cs = wb.createCellStyle();

    //New Sheet
    Sheet sheet1 = null;
    sheet1 = wb.createSheet("Meter Readings");

    // Generate column headings
    Row row = sheet1.createRow(1);

    c = row.createCell(0);
    c.setCellValue("Flat Number");
    c.setCellStyle(cs);

    sheet1.setColumnWidth(0, (15 * 200));

    // Create a path where we will place our List of objects on external storage
    File file = new File(context.getExternalFilesDir(null),fileName);
    FileOutputStream os = null;

    try {
        os = new FileOutputStream(file);
        wb.write(os);
        Log.w("FileUtils", "Writing file" + file);
        success = true;
        //os.close();
    } catch (IOException e) {
        Log.w("FileUtils", "Error writing " + file, e);
    } catch (Exception e) {
        Log.w("FileUtils", "Failed to save file", e);
    } finally {
        try {
            if (null != os) {
                os.close();
            }
        } catch (Exception ex) {
        }
    }

Answer 1

您需要重新启动手机或重新连接到您的电脑。