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How to bundle openCV *.so files into libopencv_java3.so (or single *.so file) ?

asked 2019-11-06 09:19:00 -0500

updated 2019-11-06 10:54:00 -0500

berak gravatar image

Hi

I am trying to build opencv4.1.1+opencv_contrib modules 4.1.1 with android NDK r20. Think I am almost there: went through Cmake configure/generate, compilation of shared libs 100% OK for arm64-v8a. Even install step seems to generate required resources but I am not sure of one thing:

I was used to include prebuilt libopencv_java3.so, so I expected that my build would end up with that lib, but I have 46 *.so files in build output folder ? I am probably missing an option in Cmake configuration or there is something I missed completely (new to openCV build so entirely possible) ?

Thanks for your help!

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answered 2019-11-12 03:26:39 -0500

Always awkward to answer your own question but still found the info I was missing, maybe of use, on following page: Building Java Wrapper For OpenCV

If I have managed to build my libopencv_java4.so file, it seems it doesn't link properly at runtime with message like:

java.lang.UnsatisfiedLinkError: dlopen failed: cannot locate symbol "fread_unlocked" referenced by ... /lib/arm64/libopencv_java4.so

Which I have no real clue how to debug, if anyone has, would be great!

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Asked: 2019-11-06 09:19:00 -0500

Seen: 40 times

Last updated: Nov 06