Need libpython3.7m.so.1.0 in android phone

Hello. I build with this instruction:

https://groups.google.com/forum/#!topic/kivy-users/Lf4zlYmLVPo

Apk compiled and builded. After setup and launch in my Android phone, I have a error:

SDL Error

An error occurred while trying to start the applicaion. Please try again and/or reinstall.
Error: dl open failed: could not load library: "libpython3.7m.so.1.0" needed by "libmain.so"; caused by library "libpython3.7m.so.1.0" not foud

log from logcat:

V/pythonutil(11885): Checking pattern libcrystax\.so against libSDL2_mixer.so
V/pythonutil(11885): Checking pattern libcrystax\.so against libSDL2_ttf.so
V/pythonutil(11885): Checking pattern libcrystax\.so against libmain.so
V/pythonutil(11885): Checking pattern libcrystax\.so against libSDL2.so
V/pythonutil(11885): Checking pattern libcrystax\.so against libSDL2_image.so
V/pythonutil(11885): Checking pattern libcrystax\.so against libpython3.7m.so
V/pythonutil(11885): Checking pattern libsqlite3\.so against libSDL2_mixer.so
V/pythonutil(11885): Checking pattern libsqlite3\.so against libSDL2_ttf.so
V/pythonutil(11885): Checking pattern libsqlite3\.so against libmain.so
V/pythonutil(11885): Checking pattern libsqlite3\.so against libSDL2.so
V/pythonutil(11885): Checking pattern libsqlite3\.so against libSDL2_image.so
V/pythonutil(11885): Checking pattern libsqlite3\.so against libpython3.7m.so
V/pythonutil(11885): Checking pattern libssl.*\.so against libSDL2_mixer.so
V/pythonutil(11885): Checking pattern libssl.*\.so against libSDL2_ttf.so
V/pythonutil(11885): Checking pattern libssl.*\.so against libmain.so
V/pythonutil(11885): Checking pattern libssl.*\.so against libSDL2.so
V/pythonutil(11885): Checking pattern libssl.*\.so against libSDL2_image.so
V/pythonutil(11885): Checking pattern libssl.*\.so against libpython3.7m.so
V/pythonutil(11885): Checking pattern libcrypto.*\.so against libSDL2_mixer.so
V/pythonutil(11885): Checking pattern libcrypto.*\.so against libSDL2_ttf.so
V/pythonutil(11885): Checking pattern libcrypto.*\.so against libmain.so
V/pythonutil(11885): Checking pattern libcrypto.*\.so against libSDL2.so
V/pythonutil(11885): Checking pattern libcrypto.*\.so against libSDL2_image.so
V/pythonutil(11885): Checking pattern libcrypto.*\.so against libpython3.7m.so
V/pythonutil(11885): Loading library: SDL2
V/pythonutil(11885): Loading library: SDL2_image
V/pythonutil(11885): Loading library: SDL2_mixer
V/pythonutil(11885): Loading library: SDL2_ttf
V/pythonutil(11885): Loading library: python2.7
V/pythonutil(11885): Library loading error: dalvik.system.PathClassLoader[DexPathList[[zip file "/data/app/com.kivymd.test-1/base.apk"],nativeLibraryDirectories=[/data/app/com.kivymd.test-1/lib/arm, /vendor/lib, /system/lib]]] couldn't find "libpython2.7.so"
V/pythonutil(11885): Loading library: python3.5m
V/pythonutil(11885): Library loading error: dalvik.system.PathClassLoader[DexPathList[[zip file "/data/app/com.kivymd.test-1/base.apk"],nativeLibraryDirectories=[/data/app/com.kivymd.test-1/lib/arm, /vendor/lib, /system/lib]]] couldn't find "libpython3.5m.so"
V/pythonutil(11885): Loading library: python3.6m
V/pythonutil(11885): Library loading error: dalvik.system.PathClassLoader[DexPathList[[zip file "/data/app/com.kivymd.test-1/base.apk"],nativeLibraryDirectories=[/data/app/com.kivymd.test-1/lib/arm, /vendor/lib, /system/lib]]] couldn't find "libpython3.6m.so"
V/pythonutil(11885): Loading library: python3.7m
V/pythonutil(11885): Loading library: main
E/art     (11885): dlopen("/data/app/com.kivymd.test-1/lib/arm/libmain.so", RTLD_LAZY) failed: dlopen failed: could not load library "libpython3.7m.so.1.0" needed by "libmain.so"; caused by library "libpython3.7m.so.1.0" not found
V/pythonutil(11885): Library loading error: dlopen failed: could not load library "libpython3.7m.so.1.0" needed by "libmain.so"; caused by library "libpython3.7m.so.1.0" not found
V/pythonutil(11885): An UnsatisfiedLinkError occurred loading main
W/System.err(11885): dlopen failed: could not load library "libpython3.7m.so.1.0" needed by "libmain.so"; caused by library "libpython3.7m.so.1.0" not found``` 

[opacam]

Ok, I solved the linkage problem with libpython3.7.so.1.0, and @inclement was in the right direction:

…the Java method called to load the libraries automatically finds them and only supports a .so suffix

So…there is no way that the java loader can load a versioned library…therefore… is no problem with gradle, is our build method what is causing the problems, but this can be easily solved by forcing that the python library gets built without the version, so this way we will have the proper suffix, and we will avoid all this linkage problems.

The fix is already applied in pr #1537, but here I leave a link to a patch that will solve the problem for the current master branch: https://gist.github.com/opacam/10cef1ca8182a39b9e5ebffe0adcdc90#file-fix-python3-linkage-patch

[ghost]

@inclement the exact environment p4a-py3-api28ndk21’s details are specified here:

https://github.com/JonasT/p4a-build-spaces/blob/master/environments/p4a-py3-api28ndk21/Dockerfile

Edit: I don’t know if it’s a generic problem, because I haven’t tried any other environment with the python3 recipe. I use python3crystax with the TLS hack rebuild usually, which has no such issues but I guess that’s also packaged differently

Please also note that sudo p4aspaces shell p4a-py3-api28ndk21 --p4a master gives you, after some build waiting time, a bash with everything isolated & installed in the affected versions in docker (needs docker installed of course). Just in case that would help with debugging. I can also assist with that on discord if that helps, both debugging and launching the environment