Develop Reference

Kivy App working on pc but not in android

I have made an apk by converting .py kivy with the help of buidozer in google colab. The earlier versions were working but now latest version is not working.
May be there is a problem in my .spec file so I am attaching it ...
At first I think my assest(images) are causing this problem but after removing them too it's not working.
I have done some research and got this buildozer -v android debug deploy run logcat but I don't know how to execute and use this command....
.spec file link : https://github.com/AyushRaj0305/APP/blob/main/.spec
All I want is that my apk should work in android
Thanks for Help

I have same issue in past and I solve by adding requirements in .spec
This requirements work for me:
requirements = hostpython3==3.7.8,python3==3.7.8,kivy==1.11.1, certifi,chardet, lxml, docutils, future, idna, Kivy-Garden, Pygments, requests, six, soupsieve, urllib3, deep-translator, arabic-reshaper, python-bidi, openssl, pyopenssl, numpy, pytz, python-dateutil, pandas, setuptools, zope.interface, datetime
you have to write all modules and parent module in requirements which your app is using.
To know module which you app is using has two method:
run command pip freeze in current app folder in powershell
install all the module as below photo which help to install your application module
I have debugged your code and found missing PIL

How to display python matplotlib graphs (png) with Chaquopy in Android Studio

So I use chaquopy to get simple python programs functioning in an old (jelly bean) tablet (I replace the example console app's main.py in the src directory). Not bad for a beginner's start and I'm very happy.
But now for a test I try to display a matplotlib graph like this:
import matplotlib.pyplot as plt
import matplotlib.image as mpimg
def main():
image = mpimg.imread("/storage/emulated/0/Documents/test.png")
plt.imshow(image)
plt.show()
The matplotlib library was installed from within android studio (albeit with a few missing elements, manual pip3 install and usage of local files). Now the build and program finish without errors, but there is no graph. Installation of pillow and use of other graph types no avail.
Can this be handled in python, or is a dive into android studio / java required?
Thanks for any advice

You'll have to include an ImageView in your app's layout, and then load the image file into it, as in this answer.
For an image which is generated dynamically by matplotlib, either save it to a file and then load from that file, or save it to a bytes object like this:
import io
bio = io.BytesIO()
plt.savefig(bio, format="png")
b = bio.getvalue()
... and then load that bytes object into the ImageView like in this app.

Unity: DllNotFoundException (Unity 2018.2; Android)

I have an Android native library (C++ code base) called:
libserverapp.so
And I cannot get the Android build to find it:
"DllNotFoundException: serverapp"
I am using an internal build system, but when I parse the output of the build process, I can see many calls of the form:
android-ndk/toolchains/arm-linux-androideabi-4.6/prebuilt/windows/bin/arm-linux-androideabi-g++.exe -march=armv7-a
After building my Android app, I inspect the resulting APK (renaming to .zip and extracting), and can see my library file here:
lib/armeabi-v7a/libserverapp.so
I can confirm that "ARMv7" is the target architecture in the Android Player settings, and I access the library, in C#, via:
[DllImport("serverapp", CallingConvention = CallingConvention.Cdecl)]
private static extern void run_sim(StringBuilder matchInput, StringBuilder results, int randomSeed);
I have built a Windows DLL of the C++ code, to use in the Editor, and everything works great. However, when I move to Android, the .so cannot be found. The import settings for libserverapp.so are:
Platform: Android; CPU: ARMv7; Path: Assets/Plugins/Android/libserverapp.so; Type: Native
Given that the final APK includes the .so where I expect it to be (lib/armeabi-v7a/), I assume my Unity settings are correct? Also, I am not using IL2CPP for the Android build.
Finally, when I do an object dump of the library file (using arm-linux-androideabi-objdump.exe), the file format of the library file is "elf32-littlearm".
I feel that the issue here is simply finding the .so, not the functionality within it. Any ideas on what's going on here?
Thanks!

I ended up solving the problem. I mentioned that was using an internal build system. Well, there seems to be a bug in it. I ported things over to official Android NDK makefiles, and then it "just worked". So in this case, the library could be found, but its contents weren't valid.

pyqtdeploy: add external modules

is there someone who has experience with pyqtdeploy and adding external modules? I am currently using pyqtdeploy (version 1.2) together with PyQt 5.5.1 to write an application that can be deployed to an Android device. Without any external modules, the freezing with pyqtdeploy works pretty well. However, I am not really sure how I can add external modules (not pure Python ones) to my application.
In particular, I want to add the external module pycrypto. Therefore, I downloaded the pycrypto sourcecode, compiled it with the Android toolchain (from the Android NDK) and now I have a bunch of *.py and *.so files. How can I add them to my application?
My initial attempt was to add the *.py and the *.so files (so basically the whole pycrypto module) to the "Other Packages" tab in pyqtdeploy.
But now, when I import something pycrypto related in my application (from Crypto.Cipher import AES) i get the following error message:
File: ":/Crypto/Cipher/_AES.py", line 20 in __bootstrap__
TypeError: 'NoneType' object is not callable
The _AES.py file where the error is thrown, looks like this:
def __bootstrap__():
global __bootstrap__, __loader__, __file__
import sys, pkgutil, imp
__file__ = pkgutil.get_data(__name__,'_AES.cpython-34m.so')
__loader__ = None; del __bootstrap__, __loader__
imp.load_dynamic(__name__,__file__)
__bootstrap__()
At first I thought, that the *.so filename was just wrong and therefore, I got the NoneType Error, so I changed the filename in _AES.py to something other like 'test.so'. Surprisingly, now, I get a different error message than before:
File ":/pkgutil.py" line 629, in get_data
ImportError: qrcimporter: error opening file :/Crypto/Cipher/test.so
Ok, so the filename should be fine, right? But why do i get the 'NoneType` error message? What am I doing wrong? Is this the right way to accomplish this?
Any help is highly appreciated. I am pretty sure, that i'm only one small step away from getting this thing to work, but I can't figure out what i'm doing wrong.
Thanks!

Two ane file conflict in one flex mobile application

I have two ane file for video recorder. One is for android and another is for ios device. Both have different package name and methods.
Now, i import both Native Extension in single project. And detect ios and android device following way:
if(Capabilities.version.indexOf('IOS') > -1) //for ios device
And
if(Capabilities.version.indexOf('AND') > -1) //for android device
And create object for each class. Now when i run that it gives error for another ane class not found.
Like Suppose i check in ios then gives error for android ane file class, Event not found. same for android.

If you have an ANE that only supports Android it won't be available at all when run in Ios (same is true for Ios). If it has a default implementation its classes will be available but if it doesn't then its classes will just not exist in that scope and error will be thrown if you try to reference them. When using ANE that only offer one platform implementation those ANE have to be used only when compiling for that platform. The way you can switch between ANEs easily is by using CONFIG constants.
EDIT: Defining constants. Right Click project and choose "properties", in "Actionscript compiler" add as many config lines as you see fit, for example:
-define=CONFIG::ANDROID,false
-define=CONFIG::IOS,false
Now wrap all code (including import statements) referencing the Android ANE and the IOS ANE with:
CONFIG::ANDROID
{
//android code here
}
CONFIG::IOS
{
//ios code here
}
Now your 2 config variables are set to false so no code in between "CONFIG::ANDROID" or "CONFIG::IOS" will be compiled with your app. Now if in "actionscript compiler" you change:
-define=CONFIG::ANDROID,true
All code that is in between "CONFIG::ANDROID" will be compiled (you can use "CONFIG::ANDROID" anywhere in your code as many times as you want).
So before compiling set one config to true and make sure the other is set to false and the right code for the right platform will be compiled.

Capabilities.version will tell you: "Specifies the Flash Player or Adobe® AIR® platform and version information." and not the OS version you are running on.
See here http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/system/Capabilities.html#version
You need to use Capabilities.os instead
http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/system/Capabilities.html#os