在 OpenCV android 应用程序中启用“libc++_shared.so”

Question

I wand to implement a project with OpenCV . I have imported the the OpenCV SDK in the project and i am getting the error in as follows:-

java.lang.UnsatisfiedLinkError: dlopen failed: library "libc++_shared.so" not found

i have read your solution in stackoverflow. The link is as below:-

Android Studio CMake - shared library missing libc++_shared.so? Can CMake bundle this?

and i have tried to implement a solution from github:-

https://github.com/jomof/ndk-stl/blob/master/ndk-stl-config.cmake

I could not find any solution.

I just want "libc++_shared.so" packaged into the apk and the SDK runs properly in my project. i have no knowledge about the build tool cmake or ndk-build.

Please give a simple solution so that i can enable "libc++_shared.so" in the application so that the OpenCV project run properly.

My Error Log looks as below.

My Project structure looks as:-

Earlier i have added CMakeLists.txt as mentioned in the OpenCV SDK as

cmake_minimum_required(VERSION 3.6)

 # dummy target to bring libc++_shared.so into packages
 add_library(opencv_jni_shared STATIC dummy.cpp)

and a dummmy.cpp file that may include "libc++_shared.so" in the apk. Yet No results.

Please help with a solution.

Answer 1

Try to add the following line into your build.gradle file from the app section.

arguments "-DANDROID_STL=c++_shared"

It must be added to the externalNativeBuild sub-section.

android {
    .
    .
    defaultConfig {
        .
        externalNativeBuild {
            cmake {
                .
                arguments "-DANDROID_STL=c++_shared"
            }
        }
    }
}

btw: Ranjit Vamadevan , I don't see your solution here but you mentioned you found one in your comments directly. I can not answer there. Could you please share it with us too?

Answer 2

This solved it for me: Put the content of the C:\\Users%username%\\AppData\\Local\\Android\\sdk\\ndk-bundle\\sources\\cxx-stl\\llvm-libc++\\libs%platform%\\libc++_shared.so file in your jniLibs folder(s).

Found here: https://github.com/bkaradzic/bgfx/issues/1122#issuecomment-296356682