FIX: copy additional jar files into the correct libs directory

[OptimusGREEN]

This fixes the issue where additional jar files specified in the buildozer spec at android.add_jars aren't copied to the correct build directory resulting in a failed build attempt.

[AndreMiras]

How did you get to test it to make sure it works? I'm getting an error during gradle build: Failed to transform file
Edit: Thanks for the PR by the way 😄

[OptimusGREEN]

I forked master and edited the file. It ran straight through and copied over the jar files to the correct directory and completed successfully. Without this change I get an error saying my jar files can't be found at ...src/main/libs

So yeah works here.

Give me some time and I can share logs with and without if you like?

[AndreMiras]

Oh thanks, well yes that's what I did, but I end up with the error described in #1563 (comment)
The error says:

[DEBUG]:        Could not resolve all files for configuration ':debugCompileClasspath'.
[DEBUG]:        > Failed to transform file 'jartest.jar' to match attributes {artifactType=android-classes} using transform JarTransform
[DEBUG]:           > Transform output file /home/bobf/.local/share/python-for-android/dists/ex/src/main/libs/jartest.jar does not exist.

[OptimusGREEN]

Log with this pr (src/main/libs) - successful
https://paste.city/149

Log without this change (default libs) - error
https://paste.city/150

[AndreMiras]

Thanks @OptimusGREEN very helpful debug session log.
I could eventually have it working in the Docker env after cleaning everything and building again from scratch.
The test command was:

python setup_testapp_python3.py apk --sdk-dir $ANDROID_SDK_HOME --ndk-dir $ANDROID_NDK_HOME --bootstrap sdl2 --requirements python3,kivy --add-jar ~/testapps/commons-compress-1.14.jar

With commons-compress-1.14.jar just being some random jar I first copied over to the ~/testapps/ dir for testing.
To start from clean build I ran the following command to delete everything related to previous builds:

rm -rf ~/.local/ ~/.gradle/ ~/.cache/ ~/.ccache/

Note that I may be deleting too much, but who cares in a Docker env 😄

[RobertFlatt]

Builds, but I get a runtime "Class not found".
I'm using the kivy:master with the commit, also tried OptimusGREEN:master this has the same behavior

the jar:

tst3>jar tf *.jar
META-INF/
META-INF/MANIFEST.MF
com/fishes/Hardware.java

Unzip the apk and I can see the jar contents at the root of the apk :

tst3/uz2>unzip *.apk
Archive:  ex-0.0.0-debug.apk
  inflating: AndroidManifest.xml
  inflating: META-INF/CERT.RSA
  inflating: META-INF/CERT.SF
  inflating: META-INF/MANIFEST.MF
 extracting: assets/private.mp3
  inflating: classes.dex
  inflating: com/fishes/Hardware.java
  ...and more lines...

Test python is:

    from jnius import autoclass
    def on_start(self):
        # This works:
        for m in dir(autoclass('org.jnius.NativeInvocationHandler')):
            print(m)
        # This crashes:
        for m in dir(autoclass('com.fishes.Hardware')):
            print(m)

And logcat says the jar contents is not found (the symbols before "Traceback" are from .NativeInvocationHandler) :

02-09 16:38:43.981 13493 13521 I python  : invoke
02-09 16:38:43.981 13493 13521 I python  : notify
02-09 16:38:43.981 13493 13521 I python  : notifyAll
02-09 16:38:43.981 13493 13521 I python  : pythonObjectPointer
02-09 16:38:43.981 13493 13521 I python  : toString
02-09 16:38:43.981 13493 13521 I python  : wait
02-09 16:38:43.981 13493 13521 I python  :  Traceback (most recent call last):
02-09 16:38:43.982 13493 13521 I python  :    File "/mnt/c/users/bobf/documents/pm/tst3/main.py", line 30, in <module>
02-09 16:38:43.982 13493 13521 I python  :    File "/home/bobf/.local/share/python-for-android/build/python-installs/ex/kivy/app.py", line 854, in run
02-09 16:38:43.982 13493 13521 I python  :    File "kivy/_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
02-09 16:38:43.982 13493 13521 I python  :    File "/mnt/c/users/bobf/documents/pm/tst3/main.py", line 19, in on_start
02-09 16:38:43.982 13493 13521 I python  :    File "/home/bobf/.local/share/python-for-android/build/python-installs/ex/jnius/reflect.py", line 159, in autoclass
02-09 16:38:43.983 13493 13521 I python  :    File "jnius/jnius_export_func.pxi", line 26, in jnius.jnius.find_javaclass
02-09 16:38:43.983 13493 13521 I python  :  jnius.jnius.JavaException: Class not found b'com/fishes/Hardware'

The jnius java file is (of course ) in the apk at :
assets/_python_bundle/site-packages/jnius/src/org/jnius/NativeInvocationHandler.java

Is this pilot error, or something else?