I have a lot of questions about Mobile Network feature from Android 5 (Lollipop) user. I want to explain this situation for public.
The Mobile Network control API is deprecated for external app developers for years ago. But community found work around via system exploit. And it works for all versions starting from 2.2 and till 4.4. But in Lollipop Google fixed this system exploit. So, all apps that use this way to switch Mobile Network were broken.
Currently there is only one way to disable/enable Mobile Network. It’s APN modification. But it’s not acceptable for me, because it’s not safe (user can have problems with restoring Mobile Network after app uninstall) and it’s absolutely useless in terms of power save (your device trying to connect to not existing network and drilling the battery).
I’m apologise for this situation. I’m looking for solution. Before I’ll find it this feature will be hidden on all Android 5 devices.
P.S. Google had a lot of bugs in Lollipop. I’m continue to work on Nights Keeper compatibility. Look forward for updates.