小编use*_*551的帖子

我已尝试使用各种版本的itext,包括带有试用许可证的itextgoogle,当我尝试运行我的代码时,我不断收到以下错误:

     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,但我不知道从哪里开始/如何做到这一点.我发现的罐子的文件名不是很具描述性.

我正在尝试生成一个简单的PDF并将其传递给Google Cloud Print,但是当我尝试将PDF打印到我的Google驱动器时没有任何反应.(登录工作)对于初学者,我如何验证我的PDF是完整有效的？我觉得我正在接受iText的话.

另外,我收到一些错误告诉我

public class PDFViewer extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
    this.getWindow().setSoftInputMode
                  (WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
    super.onCreate(savedInstanceState);

    InputStream object = this.getResources().openRawResource(R.raw.itextkey);
    LicenseKey.loadLicenseFile(object);

    File root = Environment.getExternalStorageDirectory();

    File f = new File(android.os.Environment.getExternalStorageDirectory()
               .getAbsolutePath() + java.io.File.separator + "HelloWorld.pdf");
    boolean externalStorageAvailable = false;
    boolean externalStorageWriteable = false;
    String state = Environment.getExternalStorageState();
    // if we can read and write to storage
    if (Environment.MEDIA_MOUNTED.equals(state)) {
        externalStorageAvailable = true;
        externalStorageWriteable = true;
    }
    // else if we can read but cannot write
    else if …