Couldn't load shared library 'gdx' for target

Question

I'm having the same issue as in this question, but the answers there doesn't solve my problem.

I didn't create project by gdxsetup.jar, I just included gdx.jar and gdx-backend-android.jar. I added the libgdx.so to libs/x86, but it stills throws an exception. How should I solve this?

Logcat:

02-16 11:59:45.604: E/AndroidRuntime(14788): FATAL EXCEPTION: main
02-16 11:59:45.604: E/AndroidRuntime(14788): java.lang.ExceptionInInitializerError
02-16 11:59:45.604: E/AndroidRuntime(14788):    at java.lang.Class.newInstanceImpl(Native Method)
02-16 11:59:45.604: E/AndroidRuntime(14788):    at java.lang.Class.newInstance(Class.java:1130)
02-16 11:59:45.604: E/AndroidRuntime(14788):    at android.app.Instrumentation.newActivity(Instrumentation.java:1078)
02-16 11:59:45.604: E/AndroidRuntime(14788):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2210)
02-16 11:59:45.604: E/AndroidRuntime(14788):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2349)
02-16 11:59:45.604: E/AndroidRuntime(14788):    at android.app.ActivityThread.access$700(ActivityThread.java:159)
02-16 11:59:45.604: E/AndroidRuntime(14788):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1316)
02-16 11:59:45.604: E/AndroidRuntime(14788):    at android.os.Handler.dispatchMessage(Handler.java:99)
02-16 11:59:45.604: E/AndroidRuntime(14788):    at android.os.Looper.loop(Looper.java:176)
02-16 11:59:45.604: E/AndroidRuntime(14788):    at android.app.ActivityThread.main(ActivityThread.java:5419)
02-16 11:59:45.604: E/AndroidRuntime(14788):    at java.lang.reflect.Method.invokeNative(Native Method)
02-16 11:59:45.604: E/AndroidRuntime(14788):    at java.lang.reflect.Method.invoke(Method.java:525)
02-16 11:59:45.604: E/AndroidRuntime(14788):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
02-16 11:59:45.604: E/AndroidRuntime(14788):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
02-16 11:59:45.604: E/AndroidRuntime(14788):    at dalvik.system.NativeStart.main(Native Method)
02-16 11:59:45.604: E/AndroidRuntime(14788): Caused by: com.badlogic.gdx.utils.GdxRuntimeException: Couldn't load shared library 'gdx' for target: Linux, 32-bit
02-16 11:59:45.604: E/AndroidRuntime(14788):    at com.badlogic.gdx.utils.SharedLibraryLoader.load(SharedLibraryLoader.java:114)
02-16 11:59:45.604: E/AndroidRuntime(14788):    at com.badlogic.gdx.utils.GdxNativesLoader.load(GdxNativesLoader.java:34)
02-16 11:59:45.604: E/AndroidRuntime(14788):    at com.badlogic.gdx.backends.android.AndroidApplication.<clinit>(AndroidApplication.java:62)
02-16 11:59:45.604: E/AndroidRuntime(14788):    ... 15 more
02-16 11:59:45.604: E/AndroidRuntime(14788): Caused by: java.lang.UnsatisfiedLinkError: Couldn't load gdx from loader dalvik.system.PathClassLoader[dexPath=/data/app/com.example.gamr-1.apk,libraryPath=/data/app-lib/com.example.gamr-1]: findLibrary returned null
02-16 11:59:45.604: E/AndroidRuntime(14788):    at java.lang.Runtime.loadLibrary(Runtime.java:355)
02-16 11:59:45.604: E/AndroidRuntime(14788):    at java.lang.System.loadLibrary(System.java:525)
02-16 11:59:45.604: E/AndroidRuntime(14788):    at com.badlogic.gdx.utils.SharedLibraryLoader.load(SharedLibraryLoader.java:110)
02-16 11:59:45.604: E/AndroidRuntime(14788):    ... 17 more

If it helps, I'm running 32-bit Linux.

Answer 1

I was able to fix the problem by removing armeabi natives from the copyAndroidNatives task

// called every time gradle gets executed, takes the native dependencies of
// the natives configuration, and extracts them to the proper libs/ folders
// so they get packed with the APK.
task copyAndroidNatives {
    doFirst {
        // file("libs/armeabi/").mkdirs()
        file("libs/armeabi-v7a/").mkdirs()
        file("libs/arm64-v8a/").mkdirs()
        file("libs/x86_64/").mkdirs()
        file("libs/x86/").mkdirs()

        configurations.natives.copy().files.each { jar ->
            def outputDir = null
            if (jar.name.endsWith("natives-arm64-v8a.jar")) outputDir = file("libs/arm64-v8a")
            if (jar.name.endsWith("natives-armeabi-v7a.jar")) outputDir = file("libs/armeabi-v7a")
            // if(jar.name.endsWith("natives-armeabi.jar")) outputDir = file("libs/armeabi")
            if(jar.name.endsWith("natives-x86_64.jar")) outputDir = file("libs/x86_64")
            if(jar.name.endsWith("natives-x86.jar")) outputDir = file("libs/x86")
            if(outputDir != null) {
                copy {
                    from zipTree(jar)
                    into outputDir
                    include "*.so"
                }
            }
        }
    }
}

Answer 2

I actually just faced the same problem after I uploaded by first update to my app ("October Bro"). While the first release has been run perfectly when installed from the Play Store, the update crashed right after launching. Checking Logcat, I exactly have been facing this issue.

The reason why my first release worked without a problem, but not the update was simple: because I only wanted to fix a minor bug, I checked out the project from GitHub, only ran the Desktop app once to verify the fix, and then created the signed AppBundle right away. It looks like I simply had to run the "android" run configuration at least once, before creating the AppBundle. Or to be more precise, the build.grade of the android module, which performs these tasks:

// android/build.gradle

...

// called every time gradle gets executed, takes the native dependencies of
// the natives configuration, and extracts them to the proper libs/ folders
// so they get packed with the APK.
task copyAndroidNatives {
    doFirst {
        file("libs/armeabi/").mkdirs()
        file("libs/armeabi-v7a/").mkdirs()
        file("libs/arm64-v8a/").mkdirs()
        file("libs/x86_64/").mkdirs()
        file("libs/x86/").mkdirs()

        configurations.natives.files.each { jar ->
            def outputDir = null
            if (jar.name.endsWith("natives-arm64-v8a.jar")) outputDir = file("libs/arm64-v8a")
            if (jar.name.endsWith("natives-armeabi-v7a.jar")) outputDir = file("libs/armeabi-v7a")
            if(jar.name.endsWith("natives-armeabi.jar")) outputDir = file("libs/armeabi")
            if(jar.name.endsWith("natives-x86_64.jar")) outputDir = file("libs/x86_64")
            if(jar.name.endsWith("natives-x86.jar")) outputDir = file("libs/x86")
            if(outputDir != null) {
                copy {
                    from zipTree(jar)
                    into outputDir
                    include "*.so"
                }
            }
        }
    }
}

I thought that this android/build.gradle is executed anyways once I hit Build > Build Bundle(s) / APK(s). But that does not seem to be the case.

Answer 3

My problem was that I was trying to make my GDX app within a shared library (aka, not the thing that gets compiled into an APK), but hadn't finished setting up all the GDX-including stuff in my lib.

So I had:

MyProject
-->MyMainApp
-->-->build.gradle <-- no updates required, doesn't do anything with GDX
-->MySharedLibraryWhereMyGameEngineIs
-->-->build.gradle <-- this is where the problem was

In the shared lib's build.gradle, I hadn't included the sourceSets parameter.

Adding it fixed my problem. GDX now starts up successfully.

apply plugin: 'com.android.library'
android {
    ... config stuff ...

    sourceSets {                       // this wasn't here before
        main {                         // this wasn't here before
            jniLibs.srcDirs = ['libs'] // this wasn't here before
        }                              // this wasn't here before
        instrumentTest.setRoot('tests')// this wasn't here before
    }     

    ... a bunch of other config stuff ...
}

Answer 4

The problem I had was that for some reason libgdx.so was not copied to any of the armeabi, armeabi-v7a or x86 folders in the android project's lib folder.

Copying these over from the libgdx distribution worked for me.

Answer 5

I found out this is pretty simple : add

static { System.loadLibrary("gdx");}