Earlier quoted context omitted.
From the inside it wasn't that apparent, hence why the first Linux based prototypes did not had any radio support. And as cumbersome as Symbian C++ might have been, Android Studio + NDK + JNI wrappers still make me wish for Carbide + Symbian C++ + PIPS.
Android studio and jni dev is pretty trivial TBH. It even builds the boilerplate for you
NDK is designed for Java => NDK libraries only.