Question

我正在尝试在Android中生成PDF / Docx。

我尝试了很多库：apache poi，docx4j和pdf box但是在控制台中总是有这个消息。

有什么想法吗？

例如，对于docx4j的示例代码：

-runproperties: org.osgi.framework.system.packages.extra = com.sun.net.httpserver

日志：

public class ExportNotebookToWordTask extends RoboAsyncTask<Void> {

        private ProgressDialog exportProgress;
        private Activity activity;

        protected ExportNotebookToWordTask (Context context, Activity activity) {
            super(context);
            this.activity = activity;
            exportProgress = new ProgressDialog(activity);
            exportProgress.setIndeterminate(true);
            exportProgress.setCancelable(false);
            exportProgress.setCanceledOnTouchOutside(false);
            exportProgress.setMessage(context.getString(R.string.export_notebook_to_pdf_progress));
        }

        @Override
        protected void onPreExecute() throws Exception {
            super.onPreExecute();
            exportProgress.show();
        }

        @Override
        public Void call() throws Exception {

            WordprocessingMLPackage wordMLPackage = WordprocessingMLPackage.createPackage();
            wordMLPackage.getMainDocumentPart().addParagraphOfText("Hello Word!");

            File notebookDir = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + Constants.NOTEBOOKS_DIR);
            if(!notebookDir.exists()) {
                notebookDir.mkdir();
            }
            wordMLPackage.save(new File(notebookDir, course.getName() + Constants.DOCX_EXTENSION_FILE));

            return null;
        }

        @Override
        protected void onSuccess(Void result) throws Exception {
            super.onSuccess(result);
            DigitalNotebookActivity.this.finish();
        }

        @Override
        protected void onFinally() throws RuntimeException {
            super.onFinally();
            if (exportProgress != null && exportProgress.isShowing()) {
                exportProgress.dismiss();
            }
        }
    }

Answer 1

我遇到了由于未能初始化静态成员变量而导致的类似问题。

private static SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.fff \t"); // fff is a wrong format, it should be SSS.

我猜实例化错误或依赖错误会导致这种异常。

在Android Lollipop上拒绝先前失败的类java.lang.Class <library.package.class>上的重新初始化

1 个答案: