I'm trying to implement a connection between a BLUNO MEGA and my phone as demonstrated in the tutorial (https://wiki.dfrobot.com/Bluno_SKU_DFR0267).
When I install the app, it work perfectly.
However, when I copy the source code from github (https://github.com/DFRobot/BlunoBasicDemo) into android studio, the app created is not able to find any device in the scan itemList.

Could you help me?

Have you tried getting the source code from github? I think there are some settings that you need to enable to process the files. Anyway, have you tried playing clash royale? This strategy game is amazing because you can build your own empire, you can conquer nearby territories and get their resources that you can use to upgrade your building and warriors. You can also build your dragon city in this fantasy game where you are in control of all the dragons you captured.