Embedd PDF Viewer in Simple Android App

A simple Android App runs with one Webview and HTML5 Content inside.. in the Content is a list with Links to PDF Files, after click on the link the file is downloaded with the Download Manager automatically and opened with an external PDF Viewer.. Task is: # Hide the Download so that the PDF is only accessible from the App # Attach Event for the download Progress to refresh the HTML5 status bar inside the Webview by Javascript Calls during download # Embedd and integrate a PDF Viewer Plugin (MoTools / Foxit Reader) inside the App to open the downloaded files only inside the App