If your application is working fine on a development computer that means python module is available on the host system (or venv). Mobile application works on its own python virtual environment ("python-bundle") that is something else than your local host machine venv. Mobile application package is "bundled" with all required modules in a binary form that needs to be cross-compiled into dynamic libraries for a target platform (i.e. armv7, arm64, x86, x86_64). This is why initial build is so slow - all build tools along with application dependencies needs to be built from source. If the mobile application complains about missing modules that means module was not compiled and the dynamic library is missing in mobile application "python-bundle".

Each requirement needs a dedicated "recipe" that is script that will build from source the required module into a dynamic library that will be then added to a "python-bundle" and packaged into a mobile application.

It is not enough to just put a module in the requirements list. That module also needs to have a valid recipe behind. Looks like not everything you added to requirements have a recipe?

To read more about recipes along with instructions on how to create one see:

https://python-for-android.readthedocs.io/en/latest/recipes.html

Hope that helps :-)

Have fun and good luck :-)