OpenCV, PY to APK using Kivy, Buildozer having issues

[Sabari Vishnu Jayanthan Jaikrishnan]

I have a python file which uses Open CV and Aruco markers. The app works perfectly in the computer. However, it is not open on the android mobile.

• In my buildozer requirements, I have the following
  

  # (list) Application requirements
  # comma separated e.g. requirements = sqlite3,kivy
  requirements = python3,kivy,numpy,opencv-python

it gives me the following error

ImportError: OpenCV loader: missing configuration file: ['config.py']. Check OpenCV installation.

• If I use the following as requirements
  

  # (list) Application requirements
  # comma separated e.g. requirements = sqlite3,kivy
  requirements = python3,kivy,numpy,opencv

I am getting the following error:

ModuleNotFoundError: No module named 'cv2'

I am stuck here. Could anyone help me out? Thanks in advance.

[Robert]

The second one looks right.

A sanity check https://github.com/Android-for-Python/Android-for-Python-Users#changing-buildozerspec  ?

[Sabari Vishnu Jayanthan Jaikrishnan]

Thanks Robert, 

I checked and I kept everything to default. Didn't change anything in the bulldozer spec file except the requirements. 

requirements = python3,kivy,numpy,opencv

I am getting the following error in adb logcat:

09-30 14:31:54.198  8460  8534 I python  : Android kivy bootstrap done. __name__ is __main__
09-30 14:31:54.198  8460  8534 I python  : AND: Ran string
09-30 14:31:54.198  8460  8534 I python  : Run user program, change dir and execute entrypoint
09-30 14:31:54.301  8460  8534 I python  : [INFO   ] [Logger      ] Record log in /data/user/0/org.test.myapp/files/app/.kivy/logs/kivy_22-09-30_5.txt
09-30 14:31:54.301  8460  8534 I python  : [INFO   ] [Kivy        ] v2.1.0
09-30 14:31:54.301  8460  8534 I python  : [INFO   ] [Kivy        ] Installed at "/data/user/0/org.test.myapp/files/app/_python_bundle/site-packages/kivy/__init__.pyc"
09-30 14:31:54.301  8460  8534 I python  : [INFO   ] [Python      ] v3.9.9 (main, Sep 30 2022, 06:10:51)
09-30 14:31:54.301  8460  8534 I python  : [Clang 12.0.8 (https://android.googlesource.com/toolchain/llvm-project c935d99d
09-30 14:31:54.301  8460  8534 I python  : [INFO   ] [Python      ] Interpreter at ""
09-30 14:31:54.301  8460  8534 I python  : [INFO   ] [Logger      ] Purge log fired. Processing...
09-30 14:31:54.302  8460  8534 I python  : [INFO   ] [Logger      ] Purge finished!
09-30 14:31:54.817  8460  8534 I python  : [INFO   ] [Factory     ] 189 symbols loaded
09-30 14:31:54.977  8460  8534 I python  : [INFO   ] [Image       ] Providers: img_tex, img_dds, img_sdl2 (img_pil, img_ffpyplayer ignored)
09-30 14:31:55.186  8460  8534 I python  :  Traceback (most recent call last):
09-30 14:31:55.186  8460  8534 I python  :    File "/content/.buildozer/android/app/main.py", line 15, in <module>
09-30 14:31:55.186  8460  8534 I python  :  ImportError: cannot import name 'aruco' from 'cv2' (/data/user/0/org.test.myapp/files/app/_python_bundle/site-packages/cv2.so)
09-30 14:31:55.186  8460  8534 I python  : Python for android ended.

I added "opencv-contrib-python" in the requirements. 

requirements = python3,kivy,numpy,opencv,opencv-contrib-python

it gives me the following error

ImportError: OpenCV loader: missing configuration file: ['config.py']. Check OpenCV installation.

[Robert]

I know nothing about aruco, but perhaps

https://github.com/kivy/python-for-android/blob/develop/pythonforandroid/recipes/opencv_extras/__init__.py

[Bill Marriott]

I am having the same problem - were you able to resolve and if so how?

[Sabari Vishnu Jayanthan Jaikrishnan]

No. I tried a lot of ways I couldn't find a way to include open CV into an android application using Kivy. It always shows the above mentioned error 

[Robert]

https://github.com/kivy/python-for-android/blob/develop/pythonforandroid/recipes/opencv_extras/__init__.py

[Gogi Chip]

Hi guys!! Maybe someone fixed this problem?? I have the same mistake. And I can't decide...

понедельник, 24 октября 2022 г. в 13:23:58 UTC+7, Robert:

[Gogi Chip]

# (str) The directory in which python-for-android should look for your own build recipes (if any)
p4a.local_recipes = p4a-recipes/opencv_extras

I added this recipe to the Bulldozer spec. But unfortunately it didn't help...

пятница, 14 апреля 2023 г. в 15:13:58 UTC+7, Gogi Chip:

[Robert]

Use requirements https://github.com/Android-for-Python/Android-for-Python-Users#requirements-basics

If you change requirements https://github.com/Android-for-Python/Android-for-Python-Users#changing-buildozerspec

If the package is not pure Python search here https://github.com/kivy/python-for-android/tree/develop/pythonforandroid/recipes

An example using opencv https://github.com/Android-for-Python/c4k_opencv_example

[Leis Al Ayoubi]

I got it to work after a looong time tuning my buildozer.spec file.

Figured out since python-for-android repo gets cloned automatically you dont actually need to add local p4a recipes for opencv or opencv-extras.

The official p4a-repo has opencv and opencv_extras (opencv-contrib) recipes included.

Just add to requirements in buildozer.spec:

requirements = opencv, opencv_extras

[Gogi Chip]

from kivy.clock import mainthread
from kivy.graphics import Color, Rectangle
from kivy.graphics.texture import Texture
import numpy as np
import cv2
from camera4kivy import Preview

aruco_dict = cv2.aruco.getPredefinedDictionary(cv2.aruco.DICT_ARUCO_ORIGINAL)
parameters = cv2.aruco.DetectorParameters()

I added opencv_extras to the spec. 

requirements = python3,kivy,camera4kivy,gestures4kivy,opencv,opencv_extras,numpy

Error when trying to debug in Android Studio:

I/python:  Traceback (most recent call last):
I/python:    File "/home/greka/PycharmProjects/C4K_no_sound_MAIN/.buildozer/android/app/main.py", line 6, in <module>
I/python:    File "/home/greka/PycharmProjects/C4K_no_sound_MAIN/.buildozer/android/app/applayout.py", line 7, in <module>
I/python:    File "/home/greka/PycharmProjects/C4K_no_sound_MAIN/.buildozer/android/app/edgedetect.py", line 16, in <module>
I/python:  AttributeError: module 'cv2.aruco' has no attribute 'DetectorParameters'
I/python: Python for android ended.

воскресенье, 23 апреля 2023 г. в 14:45:10 UTC+7, leis...@gmail.com:

[Robert]

> I/python:  AttributeError: module 'cv2.aruco' has no attribute 'DetectorParameters'

I have no specific knowledge.

Assuming this works on the desktop, I'd check the ocv version requirements for DetectorParameters.

[Aakash Aarya]

you have to android studio for building ooencv library 

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[Robert]

This answer is incorrect.