[Solved] Use .so (Shared object) file in Android studio

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First, you need absolutly the header (.h) containing the function declaration.

Secondly, you have to create a folder that contains your .so file, you can name it for example jniLibs and put it in src/main/jniLibs, then add the sourceSets to you gradle file, into the android block : 

sourceSets {
        main {
            jniLibs.srcDirs = ['src/main/jniLibs']
        }
    }

NOTE : the jniLibs folder normally contains subfolders depending on the lib’s target ABI (arm64-v8a, armeabi-v7a, x86, x86_64), so you have to know it.

And finally you have to load the native library in the java side by adding : 

   /*  Load jni .so on initialization */
    static {
        System.loadLibrary("my-native-lib-name");
    }

And declare your function to use it like below : 

public static native void myFunction(String arg, int another_arg);

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solved Use .so (Shared object) file in Android studio