Cannot load library "opencv_java4" in android

Question

Trying to get android to work with opencv but getting this error. attaching the error log and relevant codes.

I have followed the opencv android tutorial for this to setup the project.

Error (Console) This shows when called the function

E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.logicaldp.fingerprintrecog, PID: 13300
java.lang.NullPointerException: Attempt to invoke virtual method &#39;int org.opencv.core.Mat.rows()&#39;
on a null object reference
at com.logicaldp.fingerprintrecog.ProcessActivity.showImage(ProcessActivity.java:283)
at
com.logicaldp.fingerprintrecog.ProcessActivity.buttonFilter_OnClick(ProcessActivity.java:184)
at com.logicaldp.fingerprintrecog.ProcessActivity.access$600(ProcessActivity.java:36)
at com.logicaldp.fingerprintrecog.ProcessActivity$7.onClick(ProcessActivity.java:262)
at android.view.View.performClick(View.java:7125)
at android.view.View.performClickInternal(View.java:7102)
at android.view.View.access$3500(View.java:801)
at android.view.View$PerformClick.run(View.java:27336)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)

Logcat The actual error is a little hidden so I have printed it manually. Please take note.

2020-04-02 20:26:01.660 14935-14935/? I/ingerprintreco: Not late-enabling -Xcheck:jni (already on)
2020-04-02 20:26:01.686 14935-14935/? E/ingerprintreco: Unknown bits set in runtime_flags: 0x8000
2020-04-02 20:26:01.693 14935-14935/? W/ingerprintreco: Unexpected CPU variant for X86 using defaults: x86
2020-04-02 20:26:01.856 14935-14935/com.logicaldp.fingerprintrecog W/RenderThread: type=1400 audit(0.0:96): avc: denied { write } for name="property_service" dev="tmpfs" ino=9472 scontext=u:r:untrusted_app:s0:c152,c256,c512,c768 tcontext=u:object_r:property_socket:s0 tclass=sock_file permissive=0
2020-04-02 20:26:01.859 14935-14973/com.logicaldp.fingerprintrecog D/libEGL: Emulator has host GPU support, qemu.gles is set to 1.
2020-04-02 20:26:01.862 14935-14973/com.logicaldp.fingerprintrecog W/libc: Unable to set property "qemu.gles" to "1": connection failed; errno=13 (Permission denied)
2020-04-02 20:26:01.884 14935-14973/com.logicaldp.fingerprintrecog D/libEGL: loaded /vendor/lib/egl/libEGL_emulation.so
2020-04-02 20:26:01.885 14935-14973/com.logicaldp.fingerprintrecog D/libEGL: loaded /vendor/lib/egl/libGLESv1_CM_emulation.so
2020-04-02 20:26:01.887 14935-14973/com.logicaldp.fingerprintrecog D/libEGL: loaded /vendor/lib/egl/libGLESv2_emulation.so
2020-04-02 20:26:01.933 14935-14970/com.logicaldp.fingerprintrecog D/HostConnection: HostConnection::get() New Host Connection established 0xe1b662d0, tid 14970
2020-04-02 20:26:01.934 14935-14970/com.logicaldp.fingerprintrecog D/HostConnection: HostComposition ext ANDROID_EMU_CHECKSUM_HELPER_v1 ANDROID_EMU_native_sync_v2 ANDROID_EMU_native_sync_v3 ANDROID_EMU_dma_v1 ANDROID_EMU_direct_mem ANDROID_EMU_host_composition_v1 ANDROID_EMU_host_composition_v2 ANDROID_EMU_YUV420_888_to_NV21 ANDROID_EMU_YUV_Cache GL_OES_EGL_image_external_essl3 GL_OES_vertex_array_object GL_KHR_texture_compression_astc_ldr ANDROID_EMU_gles_max_version_3_0 
2020-04-02 20:26:01.945 14935-14970/com.logicaldp.fingerprintrecog W/OpenGLRenderer: Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...
2020-04-02 20:26:01.946 14935-14970/com.logicaldp.fingerprintrecog D/eglCodecCommon: setVertexArrayObject: set vao to 0 (0) 0 0
2020-04-02 20:26:01.946 14935-14970/com.logicaldp.fingerprintrecog D/EGL_emulation: eglCreateContext: 0xe1b1a1e0: maj 3 min 0 rcv 3
2020-04-02 20:26:01.947 14935-14970/com.logicaldp.fingerprintrecog D/EGL_emulation: eglMakeCurrent: 0xe1b1a1e0: ver 3 0 (tinfo 0xe1b0f260)
2020-04-02 20:26:01.960 14935-14970/com.logicaldp.fingerprintrecog W/Gralloc3: mapper 3.x is not supported
2020-04-02 20:26:01.962 14935-14970/com.logicaldp.fingerprintrecog D/HostConnection: createUnique: call
2020-04-02 20:26:01.962 14935-14970/com.logicaldp.fingerprintrecog D/HostConnection: HostConnection::get() New Host Connection established 0xe1b66460, tid 14970
2020-04-02 20:26:01.962 14935-14970/com.logicaldp.fingerprintrecog D/HostConnection: HostComposition ext ANDROID_EMU_CHECKSUM_HELPER_v1 ANDROID_EMU_native_sync_v2 ANDROID_EMU_native_sync_v3 ANDROID_EMU_dma_v1 ANDROID_EMU_direct_mem ANDROID_EMU_host_composition_v1 ANDROID_EMU_host_composition_v2 ANDROID_EMU_YUV420_888_to_NV21 ANDROID_EMU_YUV_Cache GL_OES_EGL_image_external_essl3 GL_OES_vertex_array_object GL_KHR_texture_compression_astc_ldr ANDROID_EMU_gles_max_version_3_0 
2020-04-02 20:26:01.963 14935-14970/com.logicaldp.fingerprintrecog D/eglCodecCommon: allocate: Ask for block of size 0x1000
2020-04-02 20:26:01.963 14935-14970/com.logicaldp.fingerprintrecog D/eglCodecCommon: allocate: ioctl allocate returned offset 0x3ffff2000 size 0x2000
2020-04-02 20:26:01.968 14935-14970/com.logicaldp.fingerprintrecog D/EGL_emulation: eglMakeCurrent: 0xe1b1a1e0: ver 3 0 (tinfo 0xe1b0f260)
2020-04-02 20:26:01.988 14935-14970/com.logicaldp.fingerprintrecog D/eglCodecCommon: setVertexArrayObject: set vao to 0 (0) 1 0
2020-04-02 20:26:02.995 14935-14935/com.logicaldp.fingerprintrecog W/ActivityThread: handleWindowVisibility: no activity for token android.os.BinderProxy@a23770e
2020-04-02 20:26:03.011 14935-14935/com.logicaldp.fingerprintrecog D/OpenCV/StaticHelper: Trying to get library list
2020-04-02 20:26:03.011 14935-14935/com.logicaldp.fingerprintrecog E/OpenCV/StaticHelper: OpenCV error: Cannot load info library for OpenCV
2020-04-02 20:26:03.012 14935-14935/com.logicaldp.fingerprintrecog D/OpenCV/StaticHelper: Library list: ""
2020-04-02 20:26:03.012 14935-14935/com.logicaldp.fingerprintrecog D/OpenCV/StaticHelper: First attempt to load libs
2020-04-02 20:26:03.012 14935-14935/com.logicaldp.fingerprintrecog D/OpenCV/StaticHelper: Trying to init OpenCV libs
2020-04-02 20:26:03.012 14935-14935/com.logicaldp.fingerprintrecog D/OpenCV/StaticHelper: Trying to load library opencv_java4
2020-04-02 20:26:03.012 14935-14935/com.logicaldp.fingerprintrecog D/OpenCV/StaticHelper: Cannot load library "opencv_java4"
2020-04-02 20:26:03.012 14935-14935/com.logicaldp.fingerprintrecog W/System.err: java.lang.UnsatisfiedLinkError: dalvik.system.PathClassLoader[DexPathList[[zip file "/data/app/com.logicaldp.fingerprintrecog-C0x7aZ1B4lxWlz9OZO3RRA==/base.apk"],nativeLibraryDirectories=[/data/app/com.logicaldp.fingerprintrecog-C0x7aZ1B4lxWlz9OZO3RRA==/lib/x86, /system/lib, /system/product/lib]]] couldn't find "libopencv_java4.so"
2020-04-02 20:26:03.013 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at java.lang.Runtime.loadLibrary0(Runtime.java:1067)
2020-04-02 20:26:03.013 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at java.lang.Runtime.loadLibrary0(Runtime.java:1007)
2020-04-02 20:26:03.013 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at java.lang.System.loadLibrary(System.java:1667)
2020-04-02 20:26:03.013 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at org.opencv.android.StaticHelper.loadLibrary(StaticHelper.java:64)
2020-04-02 20:26:03.013 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at org.opencv.android.StaticHelper.initOpenCVLibs(StaticHelper.java:95)
2020-04-02 20:26:03.013 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at org.opencv.android.StaticHelper.initOpenCV(StaticHelper.java:39)
2020-04-02 20:26:03.014 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at org.opencv.android.OpenCVLoader.initDebug(OpenCVLoader.java:107)
2020-04-02 20:26:03.014 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at com.logicaldp.fingerprintrecog.ProcessActivity.<clinit>(ProcessActivity.java:41)
2020-04-02 20:26:03.014 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at java.lang.Class.newInstance(Native Method)
2020-04-02 20:26:03.014 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at android.app.AppComponentFactory.instantiateActivity(AppComponentFactory.java:95)
2020-04-02 20:26:03.014 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at androidx.core.app.CoreComponentFactory.instantiateActivity(CoreComponentFactory.java:45)
2020-04-02 20:26:03.014 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at android.app.Instrumentation.newActivity(Instrumentation.java:1243)
2020-04-02 20:26:03.014 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3182)
2020-04-02 20:26:03.014 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
2020-04-02 20:26:03.014 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
2020-04-02 20:26:03.015 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
2020-04-02 20:26:03.015 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
2020-04-02 20:26:03.015 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
2020-04-02 20:26:03.015 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:107)
2020-04-02 20:26:03.015 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at android.os.Looper.loop(Looper.java:214)
2020-04-02 20:26:03.015 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:7356)
2020-04-02 20:26:03.015 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
2020-04-02 20:26:03.015 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
2020-04-02 20:26:03.015 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
2020-04-02 20:26:03.016 14935-14935/com.logicaldp.fingerprintrecog D/OpenCV/StaticHelper: First attempt to load libs fails
2020-04-02 20:26:03.168 14935-14935/com.logicaldp.fingerprintrecog D/OpenCV/StaticHelper: Trying to get library list
2020-04-02 20:26:03.168 14935-14935/com.logicaldp.fingerprintrecog E/OpenCV/StaticHelper: OpenCV error: Cannot load info library for OpenCV
2020-04-02 20:26:03.168 14935-14935/com.logicaldp.fingerprintrecog D/OpenCV/StaticHelper: Library list: ""
2020-04-02 20:26:03.168 14935-14935/com.logicaldp.fingerprintrecog D/OpenCV/StaticHelper: First attempt to load libs
2020-04-02 20:26:03.168 14935-14935/com.logicaldp.fingerprintrecog D/OpenCV/StaticHelper: Trying to init OpenCV libs
2020-04-02 20:26:03.168 14935-14935/com.logicaldp.fingerprintrecog D/OpenCV/StaticHelper: Trying to load library opencv_java4
2020-04-02 20:26:03.169 14935-14935/com.logicaldp.fingerprintrecog D/OpenCV/StaticHelper: Cannot load library "opencv_java4"
2020-04-02 20:26:03.169 14935-14935/com.logicaldp.fingerprintrecog W/System.err: java.lang.UnsatisfiedLinkError: dalvik.system.PathClassLoader[DexPathList[[zip file "/data/app/com.logicaldp.fingerprintrecog-C0x7aZ1B4lxWlz9OZO3RRA==/base.apk"],nativeLibraryDirectories=[/data/app/com.logicaldp.fingerprintrecog-C0x7aZ1B4lxWlz9OZO3RRA==/lib/x86, /system/lib, /system/product/lib]]] couldn't find "libopencv_java4.so"
2020-04-02 20:26:03.169 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at java.lang.Runtime.loadLibrary0(Runtime.java:1067)
2020-04-02 20:26:03.169 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at java.lang.Runtime.loadLibrary0(Runtime.java:1007)
2020-04-02 20:26:03.169 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at java.lang.System.loadLibrary(System.java:1667)
2020-04-02 20:26:03.169 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at org.opencv.android.StaticHelper.loadLibrary(StaticHelper.java:64)
2020-04-02 20:26:03.169 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at org.opencv.android.StaticHelper.initOpenCVLibs(StaticHelper.java:95)
2020-04-02 20:26:03.169 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at org.opencv.android.StaticHelper.initOpenCV(StaticHelper.java:39)
2020-04-02 20:26:03.169 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at org.opencv.android.OpenCVLoader.initDebug(OpenCVLoader.java:107)
2020-04-02 20:26:03.169 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at com.logicaldp.fingerprintrecog.ProcessActivity.onResume(ProcessActivity.java:1172)
2020-04-02 20:26:03.169 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1446)
2020-04-02 20:26:03.169 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at android.app.Activity.performResume(Activity.java:7939)
2020-04-02 20:26:03.169 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at android.app.ActivityThread.performResumeActivity(ActivityThread.java:4195)
2020-04-02 20:26:03.169 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:4237)
2020-04-02 20:26:03.169 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at android.app.servertransaction.ResumeActivityItem.execute(ResumeActivityItem.java:52)
2020-04-02 20:26:03.170 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:176)
2020-04-02 20:26:03.170 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97)
2020-04-02 20:26:03.170 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
2020-04-02 20:26:03.170 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:107)
2020-04-02 20:26:03.170 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at android.os.Looper.loop(Looper.java:214)
2020-04-02 20:26:03.170 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:7356)
2020-04-02 20:26:03.170 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
2020-04-02 20:26:03.170 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
2020-04-02 20:26:03.170 14935-14935/com.logicaldp.fingerprintrecog W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
2020-04-02 20:26:03.170 14935-14935/com.logicaldp.fingerprintrecog D/OpenCV/StaticHelper: First attempt to load libs fails
2020-04-02 20:26:03.170 14935-14935/com.logicaldp.fingerprintrecog D/ERROR: Unable to load OpenCV

ProcessActivity.java This is the main thing, I was using initAsync but I read that it doesn't work anymore so switched to initDebug but still getting the same error.

 @Override
    public void onResume()
    {
        super.onResume();
//        if (!OpenCVLoader.initDebug()) {
//            Log.d("OpenCV", "Internal OpenCV library not found. Using OpenCV Manager for initialization");
//            OpenCVLoader.initAsync(OPENCV_VERSION_3_0_0, this, mLoaderCallback);
//        } else {
//            Log.d("OpenCV", "OpenCV library found inside package. Using it!");
//            mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);
//        }
        if (!OpenCVLoader.initDebug()) {
            Log.d("ERROR", "Unable to load OpenCV");
        } else {
            mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);
        }
    }

Build.gradle

apply plugin: 'kotlin-android-extensions'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.2"
    defaultConfig {
        applicationId "com.logicaldp.fingerprintrecog"
        minSdkVersion 23
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    sourceSets { main { jni.srcDirs = ['src/main/jni', 'src/main/jniLibs'] } }
    externalNativeBuild {
        ndkBuild {
            path file('../../../Downloads/OpenCV-android-sdk-2/sdk/native/jni/OpenCV.mk')
        }
    }
    sourceSets.main {
        jniLibs.srcDirs = ['libs']
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.core:core-ktx:1.2.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
    implementation project(path: ':OpenCV')
}

I'm also stucked here, Any Success?

Haneet singh Chhabra
– Haneet singh Chhabra

2020-06-27 21:44:51 +00:00
Commented Jun 27, 2020 at 21:44 — Haneet singh Chhabra
– Haneet singh Chhabra, Commented Jun 27, 2020 at 21:44

groenhen · Accepted Answer · 2020-07-20 05:44:29Z

3

Try this, I reimported the opencv as module and it works for me:

File > New > Import Module (path where the opencv is located) e.g., Downloads\OpenCV-android-sdk\sdk
File > Project Structure > Dependencies > Click app module > click "+" icon > choose Module Dependency > click the newly imported module (opencv-sdk)
In Opencv sdk, copy the libs folder located where the opencv folder (e.g. Downloads\OpenCV-android-sdk\sdk\native)
paste the copied libs folder in the project folder app\src\main and rename it jnilibs
Add this code for loading the opencv library and checking if opencv is successfully loaded (add this in oncreate)

val ocvLoaded = OpenCVLoader.initDebug();
if (ocvLoaded) 
{ 
    Toast.makeText( this@MainActivity, "OpenCV loaded", Toast.LENGTH_SHORT ).show();
}
else 
{ 
    Toast.makeText( this@MainActivity, "Unable to load OpenCV", Toast.LENGTH_SHORT ).show();
}

edited Jul 20, 2020 at 5:44

groenhen

3,02725 gold badges51 silver badges69 bronze badges

answered Jul 20, 2020 at 5:24

Bonins

312 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Asad · Accepted Answer · 2020-12-29 09:45:49Z

1

I faced same issue but after trying different solutions, none of them worked than I fixed the issue by:

while importing openCV module in your project do not import path/to/openCV/sdk/java but import path/to/openCV/sdk/

answered Dec 29, 2020 at 9:45

Asad

1,4414 gold badges21 silver badges34 bronze badges

Collectives™ on Stack Overflow

Cannot load library "opencv_java4" in android

2 Answers 2

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related