我正在像素xl上运行android oreo 8.1。当我去设置和gt;网络＆amp;互联网＆gt;数据使用率＆gt;网络限制，我注意到列出了所有保存的WiFi网络。在每个人下，它说"自动" 。当我在列表中选择其中一个网络时，我看到"自动" ，"metered" 和"未计量" 。 "自动" 在这种情况下是什么意思？
I'm running Android Oreo 8.1 on a Pixel XL. When I go to Settings > Network & Internet > Data usage > Network restrictions, I notice that all of my saved wifi networks are listed. Under each one, it says "Automatic". When I select one of the networks in the list, I see "Automatic", "Metered", and "Not metered". What does "Automatic" mean in this context?
As far as I can tell from looking at the code, "Automatic" means the network is metered if it meets at least one of these heuristics:
ANDROID_METEREDoption (code 1, 2), which the Android hotspot itself sends. Additional commentary.
(I found the code links by searching the LineageOS source code on GitHub and opening the corresponding AOSP files, since the AOSP repository browser doesn't appear to support searching; maybe there's another way.)