[chrisism]

If Kodi has filesystem permission in Android in theory should be able to read your storage partition, right?

Yes, in theory. But this is a limitation of the android itself, which does not allow access to a certain part of the file system. And as Retroarch is installed just in this blind area, only if the device had root so I could access that area.

if someone who already uses the Advanced Emulator Launcher in android with retroarch could send me the xml of some launcher I could already solve this situation. Cheers  

 Here we go. So since we were busy building in Retroarch support directly I encountered some of these issues too with Android. I myself run it on a NVidia Shield and I noticed that there are some differences between Android boxes/versions, so it might be different for your case.
First you can check the AEL assets library on Github, https://github.com/Wintermute0110/AEL-as...%20Android. You can find some launcher configurations for Android there.
I have the following paths for you to try out:

• /storage/emulated/0/Android/data/com.retroarch/
  
• /data/data/com.retroarch/
  
• /storage/sdcard0/Android/data/com.retroarch/
  
• /data/user/0/com.retroarch/