Add a python native library migration guide,please.

[ghost]

During use, I need some python wrapper for the c language native library.
For example: opencv-contrib-python.
I tried to compile it with NDK, but only generated the java wrapper.
So I want to know how to generate python wrappers

[mhsmith]

Building native packages for Android is a complicated process, so rather than writing a guide, we'd be more likely to open-source our actual build system. We're not ready to do that yet, but I'll update this issue if we do, so please subscribe to it if you're interested.

[mhsmith]

If you want to build Python libraries containing native code, you can use our package build tool, which was used to build everything in the native package repository. It supports many native build tools including Cython, pybind11, Autoconf and CMake, and handles a wide variety of cross-compilation issues.

[EDIT 2022-08] The package build tool is now open-source and is available here.

[mhsmith]

The package build tool is now open-source. See the comment above for details.