找不到android项目中的本机库（UnsatisfiedLinkError）

Question

I have an android project and I added an external .jar file which contains several .class files and in addition some .so files.

When I try to use some methods which are provided by the .class files I get a UnsatisfiedLinkError-Exception which says that the implementation for those methods couldn't be found.

Obviously the problem is that the .so libraries which contain the implementation were not correctly loaded/cannot be found.

What do I have to do that the native libraries in the external .jar file can be found from the runtime?

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More details:

I'm using AndroidStudio and the app is tested on the emulator with the device "Nexus 5 API 23 x86". The .so files support x86 too.

I copied the .jar file into the /app/libs folder. Then I right-clicked the file in the IDE and selected "Add as library".

Answer 1

As you see that crash is saying that it could not load native library. But why?

First of all I checked my structure, If native library .so files located correctly.

Seems everything was okay except this crazy error.

Then after some research, I find out that some of android devices has 64-bit processors.

This devices generates and check arm64 folder to load native library. That was the problem. Because my project does not have arm64 folder.

Here is the solution;

defaultConfig{
          ndk {
              abiFilters "armeabi-v7a", "x86", "armeabi", "mips"
             }
         }