I have not worked much on the customization of Android platform. I have sure I have worked with certain AOSP APIs like ConnectivityManager.networkCallback to handle the Wi-Fi, Ethernet and the cellular connections at my application end. Since it is firmware over the air, we need to check this and handle this at our end. So other than that, I have not used AAOS particularly. And yes, majorly I have worked with AOSP APIs that the Android provides and not on the customization of the Android platform. Sure that is included, but for that a separate team is there which works full time on those things along with the help of Google.
