I'm in China now and see Android phones on sale. A lot of google services are blocked, youtube, plus, the maps app, and others, but Android is alive and well.
That didn't stop companies making the phones and installing the OS (through a third party or with special permission, or most likely through a proxy). There was some fork in Chinese, which could be accessed.
Also, I think the App store was blocked, and a Chinese App store set up instead.
Also, python.org/downloads was also blocked (but not the rest of python.org). If you go to python.org now, there's a page labeled "Downloads" in Chinese for Chinese downloads which is not blocked. I guess it's easier to create a mirror than lobby to get a page removed from the banned list. It's weird though.
I think there was some Chinese version of android.com, but I don't know how close to the original it was.