"libmain.so" not found when XR interaction toolkit is used (as Android library)

This issue involves AR, Android and Unity as a Library

"libmain.so not found" error is displayed when building a project with Unity as a Library for Android.

How to reproduce:
- Use Unity as a library for Android example:
https://github.com/Unity-Technologies/uaal-example/blob/master/docs/android.md
- Generate an export from scenes/ux/sampleuxscene scene
https://github.com/Unity-Technologies/arfoundation-samples
Using default settings with the project (IL2CPP, v7 ,64)
If to install to the device straight from Unity 2020.2b, it works. If embeded in the example code, it does not. It throws the error if built via Android studio with Android Studio SDK, NDK.

If some other export (unity as library for android) is generated with the same Unity 2020.2b and attached to the sample code as a library, it works.

Unity 2020.2b2 Windows 10
Android Studio Android Studio 4.0.1
Build #AI-193.6911.18.40.6626763, built on June 25, 2020
Runtime version: 1.8.0_242-release-1644-b01 amd64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
Windows 10 10.0
GC: ParNew, ConcurrentMarkSweep
Memory: 1237M
Cores: 12
Registry: ide.new.welcome.screen.force=true
Non-Bundled Plugins: com.google.services.firebase

E/AndroidRuntime: FATAL EXCEPTION: main

    Process: com.unity.mynativeapp:Unity, PID: 7701

    java.lang.UnsatisfiedLinkError: dlopen failed: library "/data/app/com.unity.mynativeapp-dKUmHF3qDo8UGC74BxpWSA==/lib/arm64/libmain.so" not found

        at java.lang.Runtime.load0(Runtime.java:938)

        at java.lang.System.load(System.java:1631)

        at com.unity3d.player.UnityPlayer.loadNative(Unknown Source:18)

        at com.unity3d.player.UnityPlayer.<init>(Unknown Source:164)

        at com.unity3d.player.UnityPlayerActivity.onCreate(UnityPlayerActivity.java:41)

        at com.company.product.OverrideUnityActivity.onCreate(OverrideUnityActivity.java:16)

        at com.unity.mynativeapp.MainUnityActivity.onCreate(MainUnityActivity.java:16)

        at android.app.Activity.performCreate(Activity.java:7955)

        at android.app.Activity.performCreate(Activity.java:7944)

        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1307)

        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3423)

        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3595)

        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)

        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)

        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)

        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2147)

        at android.os.Handler.dispatchMessage(Handler.java:107)

        at android.os.Looper.loop(Looper.java:237)

        at android.app.ActivityThread.main(ActivityThread.java:7814)

        at java.lang.reflect.Method.invoke(Native Method)

        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)

        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1075)

Any help how to make AR examples work "as a library" for Android is greatly needed! Thank you!

 

Any news regarding this issue?

 

Having the same issue, using AR foundation after upgrading to 2020.2 (from 2020.1).

 

Hello @LeonhardP, I've created a self-contained project demonstrating the bug and attached it to my bug report 1321977 on FogBugz. Hope it gets looked at soon since it's a show stopper.

 

I am facing the same issue, I am using Unity 2020.2.7f1. I am attempting to export it as a library to use it in a native android application.

 

I've upgraded the project to 2021.1.1f1 and the bug is still there.

Could someone please check out my minimal Github repo which demonstrates the bug and see if they're getting the same error when running on the device? You can open the

/uaal-bug-native

folder from Android Studio and run it. The project is exported from the Unity project (at

/uaal-bug-unity

) into the

/uaal-bug-native/unityAndroidBuild

folder. The git log shows the sequence of steps I took to get there.

 

@LeonhardP I've updated the repository to Unity 2021.1.3f1 and I'm still seeing the bug. I'm using a Samsung S7 to test. I'd love to help squash this if you can point me in the right direction.