Load data to WebView in background without open Activity

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http://stackoverflow.com – I need load in background html-page in WebView in Activity. Only real background without open Activity. I try use moveTaskToBack( true); in onCreate. But this is does not always correct, Activity sometimes opens. What is best way load data to WebView in background? p.s. my real task: load data from URL in background with javascript-injections (in my Widget). (HowTos)