Load HTML page in background with javascript injection

view story

http://stackoverflow.com – I create widget to display text from html-page. I need way to load first html-page in memory (without WebView). Then I need send JavaScript injection to this page (complete form). Then I must receive second page and parse it to find necessary div. And put value of this div to widget. I want it to be in background because I have only Widget and Service. It is possible without WebView.loadUrl( myJavaScriptText); after create WebView in Activity? Any ideas please! (HowTos)