java.lang.UnsatisfiedLinkError: Couldn't load native_sample from loader

Question

错误：

Process: com.example.syafiq.opencvoi, PID: 7760
java.lang.UnsatisfiedLinkError: Couldn't load native_sample from loader dalvik.system.PathClassLoader[dexPath=/data/app/com.example.syafiq.opencvoi-13.apk,libraryPath=/data/app-lib/com.example.syafiq.opencvoi-13]: findLibrary returned null
at java.lang.Runtime.loadLibrary(Runtime.java:358)
at java.lang.System.loadLibrary(System.java:526)
at com.example.syafiq.opencvoi.Sample3Native.onManagerConnected(Sample3Native.java:79)
at org.opencv.android.AsyncServiceHelper.onServiceConnected(AsyncServiceHelper.java:319)
at android.app.LoadedApk$ServiceDispatcher.doConnected(LoadedApk.java:1114)
at android.app.LoadedApk$ServiceDispatcher$RunConnection.run(LoadedApk.java:1131)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5602)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)

sample3Native.java 第 79 行是：

 public void onManagerConnected(int status) {
        switch (status) {
            case LoaderCallbackInterface.SUCCESS:
            {
                Log.i(TAG, "OpenCV loaded successfully");

                // Load native library after(!) OpenCV initialization
                System.loadLibrary("native_sample");

并且 AsyncServiceHelper.Java 第 319 行是

mUserAppCallback.onManagerConnected(status);

Android.mk

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
include ../../sdk/native/jni/OpenCV.mk
LOCAL_MODULE    := native_sample
LOCAL_SRC_FILES := jni_part.cpp
LOCAL_LDLIBS +=  -llog -ldl
include $(BUILD_SHARED_LIBRARY)

和application.mk

APP_STL := gnustl_static
APP_CPPFLAGS := -frtti -fexceptions
APP_ABI := armeabi armeabi-v7a
LOCAL_ARM_NEON := true

代码没有错误。我已经尝试了几种解决方案，但结果仍然相同，代码是从开源网站获得的。我对 android studio 还不够好，我还在学习中。我希望你们能帮助我解决这个错误。非常感谢您的帮助和考虑，帮助我解决我的错误。感谢您的宝贵时间:)

Answer 1

在我看来，您的 "native_sample" 库版本有问题。正如它写在 documentation

Thrown if the Java Virtual Machine cannot find an appropriate native-language definition of a method declared native.

您的 class 路径中可能同时存在这两个版本，而 jvm 加载了错误的版本。所以它找到库但是在 class-loading 过程中发现不一致，可能需要的方法是在以后的 lib 版本中添加的。

我建议试试这个：

System.load(String path) //with an absolute path to needed lib

另见：Difference between System.load() and System.loadLibrary in Java

Answer 2

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.2"

    defaultConfig {
        applicationId "com.example.syafiq.opencvoi"
        minSdkVersion 19
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    sourceSets {

           // jniLibs.srcDirs = ['libs']
       main{
         jniLibs{
           srcDir 'libs'
         }
       }

    }


}

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.1.1'
    compile project(':libraries:opencv')
}

java.lang.UnsatisfiedLinkError: Couldn't load native_sample from loader

java.lang.UnsatisfiedLinkError: Couldn't load native_sample from loader

java

android

classloader