java - Android 中的 iText 合并 pdf 错误

Question

该代码在 Java 应用程序中运行良好。但是转Android后就无法编译了。错误消息:“无法解析类型 java.awt.geom.AffineTransform。它是从所需的 .class 文件间接引用的”，位于以下行:

cb.addTemplate(page, 0, 0);//compile error at this line

然后我尝试注释掉上面的行...但发生的事情是，这次合并的 pdf 文件是在 Android 中创建的，但里面什么也没有...只有空白页。

这是使用的代码。任何帮助都是值得赞赏的。(也尝试过分别使用 droidText 和普通的 iText jar...仍然没有运气)

public void concatPDFs() {

          Document document = new Document();
            try {
                uploadedFile.setVisibility(View.VISIBLE);
                File sdCard = Environment.getExternalStorageDirectory();
                 uploadedFile.setText(sdCard.getAbsolutePath());
                List<InputStream> pdfs = new ArrayList<InputStream>();
                pdfs.add(new FileInputStream("/storage/extSdCard/1.pdf"));
                pdfs.add(new FileInputStream("/storage/extSdCard/2.pdf"));
                outputStream = new FileOutputStream("/storage/extSdCard/merge.pdf");
                uploadedFile.setText("Added Files");
                List<PdfReader> readers = new ArrayList<PdfReader>();
                int totalPages = 0;
                Iterator<InputStream> iteratorPDFs = pdfs.iterator();

                // Create Readers for the pdfs.
                while (iteratorPDFs.hasNext()) {
                    InputStream pdf = iteratorPDFs.next();
                    PdfReader pdfReader = new PdfReader(pdf);
                    readers.add(pdfReader);
                    totalPages += pdfReader.getNumberOfPages();
                }
                // Create a writer for the outputstream
                PdfWriter writer = PdfWriter.getInstance(document, outputStream);
                uploadedFile.setText("PdfWriter");
                document.open();
                BaseFont bf = BaseFont.createFont(BaseFont.HELVETICA,
                        BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
                PdfContentByte cb = writer.getDirectContent(); // Holds the PDF
                // data

                PdfImportedPage page;
                int currentPageNumber = 0;
                int pageOfCurrentReaderPDF = 0;
                Iterator<PdfReader> iteratorPDFReader = readers.iterator();

                // Loop through the PDF files and add to the output.
                while (iteratorPDFReader.hasNext()) {
                    PdfReader pdfReader = iteratorPDFReader.next();

                    // Create a new page in the target for each source page.
                    while (pageOfCurrentReaderPDF < pdfReader.getNumberOfPages()) {
                        document.newPage();
                        pageOfCurrentReaderPDF++;
                        currentPageNumber++;
                        page = writer.getImportedPage(pdfReader,
                                pageOfCurrentReaderPDF);
                        cb.addTemplate(page, 0, 0);
                        uploadedFile.setText("getImportedPage");
                        // Code for pagination.
                        if (true) {
                            cb.beginText();
                            cb.setFontAndSize(bf, 9);
                            cb.showTextAligned(PdfContentByte.ALIGN_CENTER, ""
                                    + currentPageNumber + " of " + totalPages, 520,
                                    5, 0);
                            cb.endText();
                        }
                    }
                    pageOfCurrentReaderPDF = 0;
                }
                outputStream.flush();
                document.close();
                outputStream.close();
                uploadedFile.setText("Done Pdf");
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                if (document.isOpen())
                    document.close();
                try {
                    if (outputStream != null)
                        outputStream.close();
                } catch (IOException ioe) {
                    ioe.printStackTrace();
                }
            }
    }

Answer 1

基本上，Android 不支持 java.awt.* 软件包，Android 中包含的唯一来自 awt 的软件包是 java.awt.font。

引用: Android packages available