我添加了一个图标作为图像对象到 PDF 基于itext核心的openpdf页面。这是我的密码

// inout stream from file
            InputStream inputStream = new FileInputStream(file);

            // we create a reader for a certain document
            PdfReader reader = new PdfReader(inputStream);

            // we create a stamper that will copy the document to a new file
            PdfStamper stamp = new PdfStamper(reader, new FileOutputStream(file));

            // adding content to each page
            PdfContentByte over;

            // get watermark icon
            Image img = Image.getInstance(PublicFunction.getByteFromDrawable(context, R.drawable.ic_chat_lawone_new));
            img.setAnnotation(new Annotation(0, 0, 0, 0, "https://github.com/LibrePDF/OpenPDF"));
            img.setAbsolutePosition(pointF.x, pointF.y);
            img.scaleAbsolute(50, 50);

            // get page file number count
            int pageNumbers = reader.getNumberOfPages();

            if (pageNumbers < pageIndex) {
                // closing PdfStamper will generate the new PDF file
                stamp.close();
                throw new PDFException("page index is out of pdf file page numbers", new Throwable());
            }

            // annotation added into target page
            over = stamp.getOverContent(pageIndex);
            if (over == null) {
                stamp.close();
                throw new PDFException("getUnderContent is null", new Throwable());
            }

            over.addImage(img);

            // closing PdfStamper will generate the new PDF file
            stamp.close();

            // close reader
            reader.close();

现在我需要删除或更新用户点击添加的图像对象的颜色，我有点击功能返回 MotionEvent ，现在我需要删除或更新或替换添加的图像对象。
知道吗？！