iText SpongyCastle错误

Question

我已经尝试了各种版本的itext，包括带有试用许可证的itextgoogle，当我尝试运行我的代码时，我一直收到以下错误：

     InputStream object = this.getResources().openRawResource(R.raw.itextkey);
     LicenseKey.loadLicenseFile(object);
     Document document = new Document();
     try {
             PdfWriter.getInstance(document, new FileOutputStream(android.os.Environment.getExternalStorageDirectory() + java.io.File.separator + java.io.File.separator + "testPDF.pdf"));
             document.open();
             document.add(new Paragraph("testing"));
     } catch (DocumentException de) {
             System.err.println(de.getMessage());
     } catch (IOException ioe) {
             System.err.println(ioe.getMessage());
     }
     document.close();

错误是：

04-26 20:18:12.761: E/dalvikvm(1927): Could not find class 'org.spongycastle.cert.X509CertificateHolder', referenced from method com.itextpdf.text.pdf.PdfReader.readDecryptedDocObj
04-26 20:18:12.761: W/dalvikvm(1927): VFY: unable to resolve new-instance 2251 (Lorg/spongycastle/cert/X509CertificateHolder;) in Lcom/itextpdf/text/pdf/PdfReader;

我听说我需要自己构建iText，但我不确定从哪里开始/如何做。我找到的jars在它们的文件名中并不是很有描述性。

Answer 1

SpongyCastle是安卓系统中可用的BouncyCastle加密库的替代方案。看看这个线程How to include the Spongy Castle JAR in Android?，它包含了如何将SpongyCastle库包含到项目中的详细信息。