Bitmap annotation not added in PDF.

public void graphicannotation(Bitmap bitmap) { Bitmap bitmap = BitmapFactory.decodeResource(this.getResources(), R.drawable.pdf_icon); m_doc.SetCache(Global.tmp_path + "/temp.dat"); int c_page = Constant.currentpage; pa = m_doc.GetPage(c_page); pa.ObjsStart(); PDFVPage vpage = m_rPDF.m_view.vGetPage(c_page); float[] rect = { 200, 200, (200 + bitmap.getWidth()), (200 + bitmap.getHeight()) }; pa.AddAnnotBitmap(bitmap, true, rect); m_rPDF.m_view.vRenderSync(vpage); bitmap.recycle(); pa.Close(); m_rPDF.PDFSave(); //after save you should reopen the document, reget the page }