gistfile1.js

function writePrefs(){
    prefsFile = getPrefsFile();

    if (prefsFile.exists) {
        var cr = air.File.lineEnding;
	prefsXML = "<?xml version='1.0' encoding='utf-8'?>" + cr +
	           "<preferences>" +
		   cr +
		   "<time>" + getTimeSelection() + "</time>" +
		   cr +
		   "<bounce>" + getBounce() + "</bounce>" +
		   cr +
		   "<sound>" + getSound() + "</sound>" +
		   cr +
		   "<saveDate>" +
		   new Date().toString() +
		   "</saveDate>" +
		   cr +
		   "</preferences>";

        stream = new air.FileStream();
	stream.open(prefsFile, air.FileMode.WRITE);
	stream.writeUTFBytes(prefsXML);
	stream.close();
    }
}