Android POI：使用 autoSizeColumn() 时崩溃

Question

autoSizeColumn

POI 方法抛出一个异常，我无法解决：

 "java.lang.ClassNotFoundException: Didn't find class "java.awt.font.FontRenderContext" on path:..." 

出现此错误

"java.lang.NoClassDefFoundError: Failed resolution of: Ljava/awt/font/FontRenderContext;"

这是我的代码，将数据放入列后调用该方法：

  private boolean saveExcelFile(Context context, String fileName) {

    if (!isExternalStorageAvailable() || isExternalStorageReadOnly()) {
        Log.e("ExcelLog", "Storage not available or read only");
        return false;
    }

    boolean success = false;

    Cell c;

    Workbook wb = new HSSFWorkbook();

    CellStyle cs = wb.createCellStyle();
    cs.setFillForegroundColor(HSSFColor.LIGHT_ORANGE.index);
    cs.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);

    Sheet sheet1;
    sheet1 = wb.createSheet("Historique du "+date);

    MultiFormatWriter writer = new MultiFormatWriter();
    Bitmap ImageBitmap;

    CreationHelper helper = wb.getCreationHelper();

    Drawing drawing = sheet1.createDrawingPatriarch();

    Row row = sheet1.createRow(0);

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

    c = row.createCell(1);
    c.setCellValue("Code barre");
    c.setCellStyle(cs);

    c = row.createCell(2);
    c.setCellValue("Association");
    c.setCellStyle(cs);

    int m = 0;
    for(int k=0;k<ExpListDistribs.size();++k) {
        int l = 0;
        for (int n = 0; n < ExpListDistribs.get(k).getDistribs().size()*2; n++) {
            while(l<ExpListDistribs.get(k).getDistribs().size()) {
                if (isOdd(m)) {
                    row = sheet1.createRow(m + 1);
                    row.setHeight((short)800);
                    m++;
                    c = row.createCell(0);
                    c.setCellValue("");
                } else {
                    ClientAnchor anchor = helper.createClientAnchor();
                    row = sheet1.createRow(m + 1);
                    row.setHeight((short)1200);
                    c = row.createCell(0);
                    c.setCellStyle(style);
                    c.setCellValue(ExpListDistribs.get(k).getDistribs().get(l).getQuantite()+" kg");
                    c = row.createCell(2);
                    c.setCellStyle(style);
                    c.setCellValue(ExpListDistribs.get(k).getAssociation());

                    l++;
                    int t = wb.addPicture(bytes, Workbook.PICTURE_TYPE_PNG);
                    anchor.setCol1(1);
                    anchor.setCol2(2);
                    anchor.setRow1(m + 1);
                    anchor.setRow2(m + 2);
                    m++;
                    drawing.createPicture(anchor, t);
                }
            }
        }
    }

    sheet1.setColumnWidth(0, (15 * 200));
    sheet1.setColumnWidth(1, (15 * 800));
    sheet1.autoSizeColumn(2);

    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;
    } 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 ignored) {
        }
    }
    Toast.makeText(getApplicationContext(), "Success",
            Toast.LENGTH_LONG).show();
    return success;
}

有人有任何线索可以帮助我吗？
预先感谢。

Answer 1

您已标记此机器人。在 Android 上，大多数（全部？）AWT 类不可用。但 POI 需要

FontRenderContext

来计算列大小。

解决方法是将您对

autoSizeColumn(2)

的呼叫替换为

setColumnWidth(2, width)

。

width

的近似值可以通过计算该列中显示的最大字符数乘以一个因子来计算。首先尝试使用大约

0.55 * fontSizeInPoints

的值来设置比例字体。

PS：下次请提供完整的堆栈跟踪并提及您使用的 JDK 和 POI 版本。

Answer 2

它对我有用

val maxWidth = mutableListOf(0, 0, 0, 0, 0, 0, 0, ..) // size of column 
...
for ((rowIndex, rowData) in data.withIndex()) {
    val row: Row = sheet.createRow(rowIndex)
    for ((columnIndex, cellData) in rowData.withIndex()) {
        val cell = row.createCell(columnIndex)
        ...
        maxWidth[columnIndex] = max(cellData.toString().length, maxWidth[columnIndex])
        sheet.setColumnWidth(columnIndex, 256 * (maxWidth[columnIndex] + 2))
    }
}