Android WebView and Window

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http://stackoverflow.com – I use WebView with JS in my Android app. And in js functions sometimes Window class (or what is it?) is used. For example, for calling Java methods from JS: window.JavascriptInterfaceName.javaFunctionName(); And I'm curious, is there documentation about this Window class? Can't find it at android doc site... Is it different from the usual JS Window? (HowTos)