I have an Archos Hello 7 tablet running on Android 8.1
When I try to launch the app in debug mode from Android Studio, the app starts but the screen stays black.
Debug mode works fine with other phones or tablet.
Removing all the breakpoints solved the problem, even though I'm sure that execution was not stopped on a breakpoint when I had the back screen.
To remove all the breakpoints in Android Studio, open
Run menu -> View Breakpoints...
then select all your breakpoints and hit the Delete button