I decompiled dex and when browsing one of the classes I noticed that it contains imports from custom namespace like 'ua.blah.blah.ClassName'. When I started searching for it - seems like it is not in the dex file. I tried several tools for dex dumping and none of them helped.
So I'm wondering how is it possible for this apk\dex to work? Where this missing piece can be? It is cleanly not a standard class (like java.blah.blah).
Also I tried to search for DexClassLoader, so that may be it downloads this part from somewhere - no entries found..
The package name can be either to one of your ofuscated classes or a library class already ofuscated.
If its not on your source structure then its a jar/aar/gradle dependency.
Check into the build.gradle the packages. Also, I don't know if it was a jar where it will be after compiled+descompiled.