Is it possible to package native libraries so lib in a share

Question

Is it possible to package native libraries so lib in a shared module Where would be the jnilib folder in Android And what about iOS

saket · Answer

Kotlin native lets you interop with C <https kotlinlang org docs reference native c interop html>

saket · Answer

They have a sample too <https github com JetBrains kotlin native tree master samples gitchurn>

msink · Answer

Native libraries can be packaged as static a files Why do you need it as dynamic so

magnumrocha · Answer

you will have to setup this lib separately for Android and iOS for Android you have to setup the lib with NDK use jni and etc for iOS you will have the setup a the native lib using the c interop approach link above

Friedger · Answer

< msink> My understanding is that in Android I can t use static packaged libraries

magnumrocha · Answer

In Android you can load via NDK <https developer android com ndk guides prebuilts>

Friedger · Answer

< magnumrocha> I manage to use and call the library in an Android app However I don t find the right place where to put my library in androidMain or what to specify in the build file

magnumrocha · Answer

the default source folder for android gradle plugin is ` lt module gt src main` to load a lib in side `androidMain` you will have to map the source folder to find `androidMain lib `

Friedger · Answer

< magnumrocha> How do I do that

Friedger · Answer

Something like ```sourceSets androidMain dependencies implementation fileTree jnilibs ``` and then put the files with arch folders in `androidMain jnilibs`

Friedger · Answer

I tried various places without success Could not load zenroom native library no zenroom in java library path

magnumrocha · Answer

magnumrocha · Answer

as an alternative you can create the path for the default source folder in your kmp module `src main jni`

Friedger · Answer

When I try to put the srcDir in the kotlin android configuration like this ```sourceSets main jniLibs srcDir = androidMain jniLibs ``` it complains about unresolved reference jniLibs

Friedger · Answer

I tried all these at the same time

Friedger · Answer

In `androidTest` I have a unit test that calls a method in androidMain that loads the library ```System loadLibrary zenroom ```

Friedger · Answer

As I don t know how to do the mapping of jniLibs for the androidMain source set I try to find the default location Without success so far

magnumrocha · Answer

try ```sourceSets androidMain jniLibs srcDir = src androidMain jniLibs ```

Friedger · Answer

< magnumrocha> I meant the reference after sourceSets androidMain

magnumrocha · Answer

this is the wrong place to do that

magnumrocha · Answer

you have to make it inside the android gradle plugin configs

magnumrocha · Answer

this is the kmp android target config

magnumrocha · Answer

```android gt android gradle plugin compileSdkVersion 29 buildToolsVersion 29 0 3 kotlin gt kmp plugin config android ```

Friedger · Answer

Thank you for the clarification the difference was not clear

Friedger · Answer

It makes much more sense like that but the library is still not found I have created a branch of kampkit The test still fails <https github com friedger KaMPKit commit 19cd9f47e00c40cb38ea533fde124c04277b85cb>

magnumrocha · Answer

not proper a solution but I would not put that inside the `androidMain kotlin` folder but aside it `androidMain jniLibs`

Friedger · Answer

< magnumrocha> ok I have moved the lib Interestingly loading the library in an app from androidMain works So there is an issue with finding it in a unit test I have updated the app with a call to an expected `loadLibrary` method and the library is loaded