What do you think regarding the Android sensor implementation? I don't know any reason why the ndk headers haven't been updated, but based on the API version (any minimum defined so far? I'd suggest 9 or 12)
pretty much all sensors should be available, even if they're lacking official enum members. For example, the gravity sensor is missing from the official headers, but it's working without any issues (tested on Android 4.4 though).
Apart from those listed already, I'd consider the following sensors to be quite interesting for some games or possibly utility/entertainment software as well: TYPE_LIGHT, TYPE_PRESSURE, TYPE_PROXIMITY, TYPE_TEMPERATURE.