This article shows you how to open a pdf from a specific url.

With that call you assign the RadaeePDFManager to open and show the pdf from the link :

String http_link = "YOUR_HTTP_LINK";
String pdf_pswd = "YOUR_PDF_PASSWORD";
RadaeePDFManager mPDFManager = new RadaeePDFManager();
mPDFManager.show(this, http_link, pdf_pswd);

With that code you open the pdf stream :

PDFHttpStream m_http_stream = new PDFHttpStream();
m_http_stream.open(http_link);
Document m_doc = new Document();
int ret = m_doc.OpenStream(m_http_stream, pdf_pswd);

ProcessOpenResult(ret);