Thank you Gergely!
I implemented this and it works, but as soon as I use one of the SDKs methods, my App crashes and I get the following error:
/Volumes/SSD/Android/moe-final/moe/natj/natj/src/main/native/natj/ObjCRuntime.mm:1478 WARNING: Binding class refers to class FBSDKAppEvents, but it can not be found. Fallback to indirect super class.
2017-07-08 15:49:23.251 facebooktest[2924:75436] +[NSObject activateApp]: unrecognized selector sent to class 0x8c66028
org.moe.natj.objc.ObjCException: +[NSObject activateApp]: unrecognized selector sent to class 0x8c66028
I do have all the necessary librarys linked in the build phases tab in xcode.
Since I am pretty much out of ideas by now, I would really appreciate your help!