Eraser of PDF Ink

For just in case I want to inform you that I cannot add rect annotation either.
I try to use addAnnotRect but there is no rect showing after I added

Here is my code

Bitmap bmAddnot = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
float[] rect = new float[]{0, 0, bmAddnot.getWidth(), bmAddnot.getHeight()};
PDFView m_view = m_vPDF.PDFgetView();
PDFVPage v_page = m_vPDF.PDFgetView().vGetPage(m_page_no);
Page page = m_doc.GetPage(m_page_no);
page.ObjsStart();
Matrix mat = v_page.CreateInvertMatrix(m_view.vGetX(), m_view.vGetY());
mat.TransformRect(rect);
page.AddAnnotRect(mat, rect, 3, 0x80FF0000, 0x800000FF);
mat.Destroy();
m_vPDF.PDFgetView().vRender(v_page);
m_vPDF.invalidate();

Sorry I just saw the rect it's showing at the bottom left so that's might be something wrong with the float[]rect and matrx ?

please look at the attachment.

I try to print the log with this code

page.AddAnnotBitmap(bmAddnot, false, rect);
page.AddAnnotRect(mat, rect, 3, 0x80FF0000, 0x800000FF);

for (int i = 0; i < m_vPDF.PDFgetView().vGetPage(m_page_no).GetPage().GetAnnotCount(); i++) {
Annotation annot = m_vPDF.PDFgetView().vGetPage(m_page_no).GetPage().GetAnnot(i);
System.out.println(annot);
}

only one annototation show

rect is the only object showing on PDF but not Bitmap

what does this means?

Note: result of AddAnnotBitmap is always true

Any Success ??