What is the size of the Android System app? On my phone the Android System app is zero in size.
Is this normal or have I been hacked?

Thanks, J
Android System App is only there to represent the Android Framework. If your device is working, you don't have a reason to worry about that.

If that "App" was really of zero size your phone would not even work up until the point that you could actually see its size (= Android would not boot)

Whether you have been hacked is quite a different story, we can't determine that just out of knowing that it shows zero size for you on Android System.