UIAutomation, delay until network activity indicator is missing

gistfile1.js

/** Delay execution until status bar Network Activity is completed

    {}
*/
automation.afterNetworkActivityEnds = function(args, cbk) {
    var statusBar = target.frontMostApp().statusBar();
    var predicate = "name beginswith 'Network'";

    while (statusBar.elements().firstWithPredicate(predicate).isValid()) {
        UIALogger.logMessage("Waiting for network");
        target.delay(0.2);
    }

    cbk();
};