Android Question OpenGl

[GiovanniPolese]

Hi to all
I am thinking to use OpenGl on my Galaxy Tab s10 tablet and Galaxy s50 phone. I have downloaded the samples available here, particularly the NeHe examples, with no change (but the not the last lessons, with Java parts, because I have no skills on this method of working) Just compiled but nothing else than a black screen appears.
Thanks for any hint.

 

[GiovanniPolese]

Found the reason, which is rather unexpected: the apps work in release mode, while in debugger mode, just a black screen appears.