OpenCV4Android 3 with extra modules for 32 and 64 bit

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Hey there, I´m trying to compile an application with OpenCV 3 on various Android devices. I wanna use Nexus 5, 7 -> 32 bit and also Pixel C and Nexus 6p -> 64 bit.

There are two problems: 1. BRIEF descriptor is not in the official OpenCV lib and needs to be compiled with the nativly ( https://hugofs.com/blog/2015/setting-...) -> I failed with this 2. what has to be done with the libsJNI?

I´m using android studio 2.1

And one last question: Do I need the opencv manager on every device or is it possible inlcude these "classes" to the application itself?

Hope anyone had the same problems and maybe a solution or a compiled opencv 3 + extra modules version