How to remove an app with active device admin enabled on Android?

Question

I wrote an app with device admin enabled (DevicePolicyManager) and installed. But when I want to uninstall it, it returns failed with this message

WAR

Answer 1

On Samsung go to "Settings" -> "Lock screen and security" -> "Other security settings" -> "Phone administrators" and deselect the admin which you want to uninstall.

The "security" word was hidden on my display, so it was not obvious that I should click on "Lock screen".