我有第一代（2012）Nexus 7运行Android 5.0。弹出设置中有一个屏幕扩展功能，但是当我尝试设置我的Chromecast时，它无法工作，无法检测到它。该设备是否支持屏幕铸造？
I have a first generation (2012) Nexus 7 running Android 5.0. There is a screen cast feature in the popup settings, but when I try to setup my Chromecast it is not working and cannot detect it. Does this device support screen casting?
According to an article from July, the first gen Nexus 7 does not support screen casting to the Chromecast.
That information MIGHT be out of date but as of four months ago, the 2nd gen (2013) was the only Nexus 7 that was supported for screen casting