我将如何编写语音触发器来导航GoogleGlassCards？ThisishowIseeithappening:1)"OkGlass,StartMyProgram"2)Applicationbeginsandshowsthefirstcard3)Usercansay"NextCard"tomovetothenextcard(somewhattheequivalentofswipingforwardwheninthetimeline)4)Usercansay"PreviousCard"togoback我需要显示的卡片是简单的文本和图像，我想知道是否可以设置某种类型的监听器来在显示卡片时收