Good Lock 2018's Routines app holds the key
Good Lock 2018 comes with various individual apps that let you customize the user interface to your heart's content. One of those apps is Routines. It lets you define custom tasks by combining various functions (those who have used the popular app Tasker will feel instantly at home with Routines). And while Good Lock 2018 leaves it to us to be imaginative, there are a couple of preloaded ‘routines', one of which is called ‘Always On Display while charging'. You just have to enable this particular routine and, voila, you can start taking advantage of Always On Display when you charge your phone and leave it disabled at other times.
Good Lock 2018 doesn't work on all devices, but every Samsung flagship is supported since the Galaxy S7 (and let's face it: flagships are the biggest culprits when it comes to not-so-dependable battery life). So if you want to have AOD enabled only when you are charging your phone, give Good Lock 2018 and its Routines feature a go.
If Good Lock isn't officially available in your country, follow these instructions to sideload it on to your device. Then, open Good Lock 2018, tap Routines, then enable the Always On Display while charging routine in the My Routines menu.
