At the same time, the developer options suddenly disappeared on all the android devices that I used to test. I didn't do a reset or anything. Not even turning off all these devices. Why did it happen? am i hacked? maybe there are people who want to prevent me from completing the application that I made by making me confused because suddenly logcat can't connect, ON ALL ANDROID DEVICES I USE..
Go to Settings->~About this device~->(scroll down)Build number.
Click on it.
If it says: nothing,
try clicking on it seven times, to become developer again.
If it says: “you are already developer”,
this means the developer options should be enabled, try to find them via the settings search function.\
I do only know very little about hacking, but it seams very unlikely that someone disables developer options during an attack.
Maybe your app trigger something, or your rom does not allow you to install self build apps.(sometimes devices, which where given to you by schools have such options disabled)