Develop Reference

running python in android app with chaquopy yields fatal error

I'm try to run python code in my android app using Chaquopy, I'm also using the moviepy library (I'm converting a mp4 file to a gif file). When I try to do the conversion I get the following error message:
2019-02-06 15:46:47.586 3924-3924/com.udacity.gradle.builditbigger E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.udacity.gradle.builditbigger, PID: 3924
com.chaquo.python.PyException: AttributeError: module 'moviepy.audio.fx.all' has no attribute 'audio_fadein'
at <python>.moviepy.editor.<module>(<string>:1)
at <python>.moviepy.editor.<module>(editor.py:80)
at <python>.java.android.importer.load_module_impl(importer.py:435)
at <python>.java.android.importer.load_module(importer.py:353)
at <python>.importlib._bootstrap._load_backward_compatible(<frozen importlib._bootstrap>:626)
at <python>.importlib._bootstrap._load_unlocked(<frozen importlib._bootstrap>:656)
at <python>.importlib._bootstrap._find_and_load_unlocked(<frozen importlib._bootstrap>:955)
at <python>.importlib._bootstrap._find_and_load(<frozen importlib._bootstrap>:971)
at <python>.java.chaquopy.import_override(import.pxi:18)
at <python>.gif_convert.<module>(gif_convert.py:1)
at <python>.java.android.importer.load_module_impl(importer.py:435)
at <python>.java.android.importer.load_module(importer.py:353)
at <python>.importlib._bootstrap._load_backward_compatible(<frozen importlib._bootstrap>:626)
at <python>.importlib._bootstrap._load_unlocked(<frozen importlib._bootstrap>:656)
at <python>.importlib._bootstrap._find_and_load_unlocked(<frozen importlib._bootstrap>:955)
at <python>.importlib._bootstrap._find_and_load(<frozen importlib._bootstrap>:971)
at <python>.importlib._bootstrap._gcd_import(<frozen importlib._bootstrap>:994)
at <python>.importlib.import_module(__init__.py:126)
at <python>.chaquopy_java.Java_com_chaquo_python_Python_getModule(chaquopy_java.pyx:154)
at com.chaquo.python.Python.getModule(Native Method)
at com.udacity.gradle.builditbigger.newPost.visualMediaPost.VisualMediaPostFragment.moveFile(VisualMediaPostFragment.java:247)
at com.udacity.gradle.builditbigger.camera.LifeCycleCamera.getFilePath(LifeCycleCamera.java:1161)
at com.udacity.gradle.builditbigger.camera.LifeCycleCamera.stopRecordingVideo(LifeCycleCamera.java:1078)
at com.udacity.gradle.builditbigger.newPost.visualMediaPost.VisualMediaPostFragment.lambda$onCreateView$5(VisualMediaPostFragment.java:162)
at com.udacity.gradle.builditbigger.newPost.visualMediaPost.-$$Lambda$VisualMediaPostFragment$WS1G2y9p8sE-re_eOWFa7Rr0OCU.onClick(Unknown Source:4)
at android.view.View.performClick(View.java:6897)
at android.view.View$PerformClick.run(View.java:26089)
at android.os.Handler.handleCallback(Handler.java:789)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6940)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
I've found a fix for this problem (it involves changing the python code that would normally be generated by android studio, so any changes made to the python files will be overwritten during build time.
The python code is shown below
from moviepy.editor import VideoFileClip
def convert(path):
clip = VideoFileClip(path)
return clip.write_gif("output.gif", fps=24)
The java code used to start the pyhton code:
Python.start(new AndroidPlatform(getActivity()));
Python py = Python.getInstance();
PyObject gifConvert = py.getModule("gif_convert");
PyObject gif = gifConvert.callAttr("convert", file.getAbsolutePath());
Log.i("gif type", gif.toString());
Any help would be greatly appreciated.

Older versions of Chaquopy had a problem with pkgutil.iter_modules. This has been fixed in Chaquopy 6.2.1.

Failed to load .so in android studio

I wanted to load a .so file: System.loadLibrary("example");
but i faced with this error!!
this is the error:
FATAL EXCEPTION: main
Process: com.name.ex, PID: 30737
java.lang.UnsatisfiedLinkError: dlopen failed: file offset for the library "/data/app/com.name.ex-1/lib/arm/example.so" >= file size: 0 >= 0
at java.lang.Runtime.loadLibrary(Runtime.java:372)
at java.lang.System.loadLibrary(System.java:1076)
at com.name.ex.example<clinit>(example.java:582)
at java.lang.Class.newInstance(Native Method)
at android.app.Instrumentation.newApplication(Instrumentation.java:1020)
at android.app.Instrumentation.newApplication(Instrumentation.java:1005)
at android.app.LoadedApk.makeApplication(LoadedApk.java:670)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:6395)
at android.app.ActivityThread.access$1800(ActivityThread.java:229)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1887)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:7325)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

you might have placed the native assembly for ARM into the wrong directory ...or the file-size is indeed 0. it's ordinary called armeabi-v7a instead of arm, for example (the jniLibs path might need to be adjusted, depending how your project looks alike):
app/src/main/jniLibs/armeabi-v7a
in the module-level build.gradle one can define the location:
android {
...
sourceSets {
main {
jniLibs.srcDir "src/main/jniLibs"
}
}
}

UnsatisfiedLinkError - com.datumdroid.android.ocr.simple couldn't find "libjpgt.so"

I'm new to Android Studios and I am doing this OCR http://swlock.blogspot.com/2016/07/ocr-tesseract-2.html where the image convert to text but everytime I take an image app the will close and got this error. Anyone can guide me to fix this error? Thanks
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.datumdroid.android.ocr.simple, PID: 2425
java.lang.UnsatisfiedLinkError: com.android.tools.fd.runtime.IncrementalClassLoader$DelegateClassLoader[DexPathList[[dex file "/data/data/com.datumdroid.android.ocr.simple/files/instant-run/dex/slice-slice_9-classes.dex", dex file "/data/data/com.datumdroid.android.ocr.simple/files/instant-run/dex/slice-slice_8-classes.dex", dex file "/data/data/com.datumdroid.android.ocr.simple/files/instant-run/dex/slice-slice_7-classes.dex", dex file "/data/data/com.datumdroid.android.ocr.simple/files/instant-run/dex/slice-slice_6-classes.dex", dex file "/data/data/com.datumdroid.android.ocr.simple/files/instant-run/dex/slice-slice_5-classes.dex", dex file "/data/data/com.datumdroid.android.ocr.simple/files/instant-run/dex/slice-slice_4-classes.dex", dex file "/data/data/com.datumdroid.android.ocr.simple/files/instant-run/dex/slice-slice_3-classes.dex", dex file "/data/data/com.datumdroid.android.ocr.simple/files/instant-run/dex/slice-slice_2-classes.dex", dex file "/data/data/com.datumdroid.android.ocr.simple/files/instant-run/dex/slice-slice_1-classes.dex", dex file "/data/data/com.datumdroid.android.ocr.simple/files/instant-run/dex/slice-slice_0-classes.dex"],nativeLibraryDirectories=[/data/app/com.datumdroid.android.ocr.simple-2/lib/x86, /system/lib, /vendor/lib]]] couldn't find "libjpgt.so"
at java.lang.Runtime.loadLibrary0(Runtime.java:972)
at java.lang.System.loadLibrary(System.java:1530)
at com.googlecode.tesseract.android.TessBaseAPI.<clinit>(TessBaseAPI.java:44)
at com.datumdroid.android.ocr.simple.SimpleAndroidOCRActivity.onPhotoTaken(SimpleAndroidOCRActivity.java:214)
at com.datumdroid.android.ocr.simple.SimpleAndroidOCRActivity.onActivityResult(SimpleAndroidOCRActivity.java:138)
at android.app.Activity.dispatchActivityResult(Activity.java:6915)
at android.app.ActivityThread.deliverResults(ActivityThread.java:4049)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:4096)
at android.app.ActivityThread.-wrap20(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1516)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
Application terminated.

That means that the *.so files are not in your *.apk file. Follow the steps in this stackoverflow question/answer.
You can always go to Build > Analyze APK... to see if the *.so files are getting added. Obviously, if they are not in the APK, then there is no reason to attempt to run the app that needs the *.so files.

cocos2dx Android Studio crash in System.loadLibrary(libName)

I want to use cocos2dx Android Studio in mac.
I downloaded:
android-ndk-r9d, android studio 2.1.1 and apache-ant-1.9.7. cocos2dx 3.11.1
Now I am successfully creating a project by using command:
cocos new TEST -p com.your_company.test -l cpp -d /Users/mac-corei5-1/Desktop/Sayem/cocos2dx/Project
Now when I am trying to run project in Android Studio in emulator or android device it is crashing in System.loadLibrary(libName); where libName=MyGame
I got this crash log in logcat
06-30 04:46:15.291 4866-4866/com.your_company.test E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.your_company.test, PID: 4866
java.lang.UnsatisfiedLinkError: Couldn't load MyGame from loader dalvik.system.PathClassLoader[DexPathList[[zip file "/data/app/com.your_company.test-2.apk"],nativeLibraryDirectories=[/data/app-lib/com.your_company.test-2, /vendor/lib, /system/lib]]]: findLibrary returned null
at java.lang.Runtime.loadLibrary(Runtime.java:358)
at java.lang.System.loadLibrary(System.java:526)
at org.cocos2dx.lib.Cocos2dxActivity.onLoadNativeLibraries(Cocos2dxActivity.java:246)
at org.cocos2dx.lib.Cocos2dxActivity.onCreate(Cocos2dxActivity.java:260)
at android.app.Activity.performCreate(Activity.java:5231)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
at android.app.ActivityThread.access$800(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)

Even thought Cocos2d-x 3.10+ has bought in android studio support and gradle build support it still very much buggy. The reasom your build crashes is because you haven't actually created the .so file by using the Android-Studio build option. Try running
cocos compile -p android --android-studio
Via a CLI so that it correctly generates the files.
Then you can run the project via Android-studio, but remember any time you change the source of your game you have to run the CLI command. Proper workaround yet to be found.

Make ZBAR scanner compatible with Android 6.0 (API 23)

I am self-taught in Android, using Studio 2.1 and trying to get the app working on API version 23.
I am using ZBAR barcode scanner, to scan the barcodes of books and then do a lookup of the ISBN code.
This all works nicely in lower API versions. When I get to 23 there is a documented change to how Android works with a particular component.
And here is the rub - I don't understand what I need to do to fix it.
FATAL EXCEPTION: main
Process: arw.apps.barcode, PID: 24533
java.lang.UnsatisfiedLinkError: dlopen failed: /data/app/arw.apps.barcode-1/lib/arm/libiconv.so: has text relocations
at java.lang.Runtime.loadLibrary(Runtime.java:372)
at java.lang.System.loadLibrary(System.java:1076)
at arw.apps.barcode.ZBarScannerActivity.<clinit>(ZBarScannerActivity.java:29)
at java.lang.Class.newInstance(Native Method)
at android.app.Instrumentation.newActivity(Instrumentation.java:1068)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2351)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2520)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1363)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5466)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
The app compiles right, and this happens when I try to activate the camera to perform the barcode scan.
I see the DLOpen Fail error, referring to text relocations. I have read up that Android has been warning about this for a while, and in 6.0 its has not stopped working.
For good measure, I can confirm this code is present:
static {
System.loadLibrary("iconv");
}
And this is in my .build file
dependencies {
compile 'com.android.support:appcompat-v7:23.1.1'
compile 'com.android.support:design:23.1.1'
compile 'com.android.support:recyclerview-v7:23.2.1'
compile files ('libs/zbar.jar')
compile files('libs/org.apache.http.legacy.jar')
What other artifacts can I post here to help you help me :-)
Grateful in advance for asistance
Alex