Python algorithm library for Android & iOS

[Kevin Koch]

Hi there,

we developed several algorithms in Python that were ideated as prototypes for a mobile app. We explore now further steps how these algorithms can be brought into our mobile app: either we code these algorithms for each platform native, translate them into c/c++ or use some external library that maybe translates the Python code in some way.

My question is: can we create a library app for iOS and Android with Kivy which we can embed into our main app?
If yes, how can this be done?

I searched already in the documentation, however complete apps (including GUI) are discussed...

Thanks in advance!

[Andreas Ecker]

The big advantage of the kivy framework is actually that you can use your python algorithm library unchanged in both iOS and Android - if your libraries are pure Python code.

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[Kevin Koch]

Thank you Andreas for your reply. Yes, my code is purely Python (with the use of some libraries as Numpy or Pandas).

So, I can embed my written Python code as a library in another app?

Is there any example where this is done? Would appreciate a push in the right direction.

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[Andreas Ecker]

Pure Python code can be put and distributed to iOS/Android directly with your kivy app (in the same folder where your main.py is stored or within a sub-folder of it).

Numpy is not pure Python (afaik). For these sub-libraries you need a p4a (python-for-android) recipe to cross-compile the C/C++ parts of this library to your target OS (e.g. Android) - see http://python-for-android.readthedocs.io/en/latest/recipes/

Buildozer is a great tool for to make the cross-compiling and the inclusion of external C/C++ libraries much easier, see here: http://buildozer.readthedocs.io/en/latest/

see also:https://groups.google.com/forum/#!topic/kivy-users/GmlBVnVN4is

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[Kevin Koch]

Thanks! I will check it out.

[qua non]

kivy apps are nothing but integration of native apps loading python libraries  and a open gl interface on top

You have 2 options: 

1. Include the python interpreter compiled for the relative mobile platform in your app like kivy apps do.

2. Create a `library app` as you call it that runs this python interpreter as a service that other apps can interact with

for 1 you have existing codebase of kivy-ios and python-for-android that shows you how to do this.

for 2 you would again have to is kivy's codebase as a example to get your library app up.

Relevant code at 

http://github.com/kivy/kivy-ios

http://github.com/kivy/python-for-android

Regards

Akkshay

[Kevin Koch]

After exploring a bit, I see that Kivy as a whole framework is probably not the right thing for me. I do not need a full app, I just need a way to use a python interpreter within my possible library.

qua-non/Akkshay describes probably the way to go for me - using the python interpreter in a self created library.

I moved this question to Stackoverflow (with including a broader picture) https://stackoverflow.com/questions/51290516/can-i-create-based-on-python-code-executable-code-for-android-and-or-ios, maybe someone here has a good answer. Thanks for all your help!