Android NDK OpenCV - 找不到本机的实现

Question

你能帮我处理我的错误吗？我已经阅读了很多如何修复它们的提示，但没有任何帮助。我也知道已经问过类似的问题，但他们没有帮助我。所以我给一个机会问你：

我正在尝试使Android应用程序从库中获取图像并调用用c ++编写的本机函数以使其灰色。

我的主要活动是：

static {
        if(!OpenCVLoader.initDebug())
        {
            Log.e("tom", "Tomasku opencv problem static");
        }
        else
        {
            Log.e("tom", "OPENCV NACITANE");
            System.loadLibrary("halgorithm");
        }
    }

在同一个活动中，我调用另一个活动（EditorActivity）：

Intent i = new Intent(this, EditorActivity.class);
                ...
                i.putExtra("path", selectedImagePath); //path to image from gallery
                startActivity(i);

在我的编辑器活动中：

...
public native int fce(long matAddrRgba, long matAddrGray);
...
fce(image.getNativeObjAddr(), image_gray.getNativeObjAddr());
// and here it crashes

**在我的算法中.cpp

#include <jni.h>
#include <string.h>
#include <stdio.h>
#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/features2d/features2d.hpp>
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc_c.h"
//using namespace std;
using namespace cv;
extern "C"
{
JNIEXPORT jint JNICALL Java_com_example_hematoma_MainActivity_fce(JNIEnv*, jobject, jlong addrRgba, jlong addrGray) {
    Mat& mRgb = *(Mat*)addrRgba;
    Mat& mGray = *(Mat*)addrGray;
    int conv;
    jint retVal;
    conv = toGray(mRgb, mGray);
    retVal = (jint)conv;
    return retVal;
}
}
int toGray(Mat img, Mat& gray)
{
    cvtColor(img, gray, CV_RGBA2GRAY); // Assuming RGBA input
    if (gray.rows == img.rows && gray.cols == img.cols)
    {
        return 1;
    }
    return 0;
}

**在我的 Android.mk

include $(CLEAR_VARS)
OPENCV_INSTALL_MODULES:=on
OPENCV_CAMERA_MODULES:=on
include /home/nemesis/adt-bundle-linux-x86_64-20140702/OpenCV-2.4.10-android-sdk/sdk/native/jni/OpenCV.mk
LOCAL_MODULE := halgorithm
LOCAL_SRC_FILE := halgorithm.cpp
LOCAL_C_INCLUDES := /home/nemesis/adt-bundle-linux-x86_64-20140702/OpenCV-2.4.10-android-sdk/sdk/native/jni/include
include $(BUILD_SHARED_LIBRARY)

日志猫

04-30 13:16:28.320: W/dalvikvm(3863): No implementation found for native Lcom/example/hematoma/EditorActivity;.fce (JJ)I
04-30 13:16:28.320: D/AndroidRuntime(3863): Shutting down VM
04-30 13:16:28.320: W/dalvikvm(3863): threadid=1: thread exiting with uncaught exception (group=0x40185760)
04-30 13:16:28.320: E/AndroidRuntime(3863): FATAL EXCEPTION: main
04-30 13:16:28.320: E/AndroidRuntime(3863): java.lang.UnsatisfiedLinkError: fce
04-30 13:16:28.320: E/AndroidRuntime(3863):     at com.example.hematoma.EditorActivity.fce(Native Method)
04-30 13:16:28.320: E/AndroidRuntime(3863):     at com.example.hematoma.EditorActivity$3.onClick(EditorActivity.java:166)
04-30 13:16:28.320: E/AndroidRuntime(3863):     at android.view.View.performClick(View.java:3110)
04-30 13:16:28.320: E/AndroidRuntime(3863):     at android.view.View$PerformClick.run(View.java:11934)
04-30 13:16:28.320: E/AndroidRuntime(3863):     at android.os.Handler.handleCallback(Handler.java:587)
04-30 13:16:28.320: E/AndroidRuntime(3863):     at android.os.Handler.dispatchMessage(Handler.java:92)
04-30 13:16:28.320: E/AndroidRuntime(3863):     at android.os.Looper.loop(Looper.java:132)
04-30 13:16:28.320: E/AndroidRuntime(3863):     at android.app.ActivityThread.main(ActivityThread.java:4123)
04-30 13:16:28.320: E/AndroidRuntime(3863):     at java.lang.reflect.Method.invokeNative(Native Method)
04-30 13:16:28.320: E/AndroidRuntime(3863):     at java.lang.reflect.Method.invoke(Method.java:491)
04-30 13:16:28.320: E/AndroidRuntime(3863):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:864)
04-30 13:16:28.320: E/AndroidRuntime(3863):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:622)
04-30 13:16:28.320: E/AndroidRuntime(3863):     at dalvik.system.NativeStart.main(Native Method)

提前感谢！

****************************编辑***********************

在您的建议之后，我更改了：

在 Android.mk：

JNIEXPORT jint JNICALL 
Java_com_example_hematoma_**EditorActivity**_fce(JNIEnv*, jobject, jlong addrRgba, jlong addrGray) {...}

在编辑器活动中：我在本机方法之前调用System.loadLibrary（"halgorithm"）。

static {
        if(!OpenCVLoader.initDebug())
        {
            Log.e("tom", "Tomasku opencv problem static");
        }
        else
        {
            Log.e("tom", "OPENCV NACITANE");
            System.loadLibrary("halgorithm");
        }
    }

但它并没有修复我的错误。有同样的错误：/

日志猫

04-30 13:36:21.760: W/dalvikvm(4255): No implementation found for native Lcom/example/hematoma/EditorActivity;.fce (JJ)I
04-30 13:36:21.760: D/AndroidRuntime(4255): Shutting down VM
04-30 13:36:21.760: W/dalvikvm(4255): threadid=1: thread exiting with uncaught exception (group=0x40185760)
04-30 13:36:21.760: E/AndroidRuntime(4255): FATAL EXCEPTION: main
04-30 13:36:21.760: E/AndroidRuntime(4255): java.lang.UnsatisfiedLinkError: fce
04-30 13:36:21.760: E/AndroidRuntime(4255):     at com.example.hematoma.EditorActivity.fce(Native Method)
04-30 13:36:21.760: E/AndroidRuntime(4255):     at com.example.hematoma.EditorActivity$3.onClick(EditorActivity.java:166)
04-30 13:36:21.760: E/AndroidRuntime(4255):     at android.view.View.performClick(View.java:3110)
04-30 13:36:21.760: E/AndroidRuntime(4255):     at android.view.View$PerformClick.run(View.java:11934)
04-30 13:36:21.760: E/AndroidRuntime(4255):     at android.os.Handler.handleCallback(Handler.java:587)
04-30 13:36:21.760: E/AndroidRuntime(4255):     at android.os.Handler.dispatchMessage(Handler.java:92)
04-30 13:36:21.760: E/AndroidRuntime(4255):     at android.os.Looper.loop(Looper.java:132)
04-30 13:36:21.760: E/AndroidRuntime(4255):     at android.app.ActivityThread.main(ActivityThread.java:4123)
04-30 13:36:21.760: E/AndroidRuntime(4255):     at java.lang.reflect.Method.invokeNative(Native Method)
04-30 13:36:21.760: E/AndroidRuntime(4255):     at java.lang.reflect.Method.invoke(Method.java:491)
04-30 13:36:21.760: E/AndroidRuntime(4255):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:864)
04-30 13:36:21.760: E/AndroidRuntime(4255):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:622)
04-30 13:36:21.760: E/AndroidRuntime(4255):     at dalvik.system.NativeStart.main(Native Method)

Answer 1

public native int fce(...)是

EditorActivity的成员，但在C++代码中，您将函数称为Java_com_example_hematoma_MainActivity_fce。

将其重命名为 Java_com_example_hematoma_EditorActivity_fce 。

不要忘记

在调用本机函数之前调用System.loadLibrary()，例如添加您的活动：

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

Answer 2

经过几天的绝望:D我解决了我的问题。问题是$（OPENCV_INSTALL_MODULES）应该是相等的。在我的 Android.mk 文件中的行OPENCV_INSTALL_MODULES：=on。

我覆盖了OPENCV_INSTALL_MODULES：=on

自

OPENCV_INSTALL_MODULES=开启

现在它工作了....也许它也可能对其他人有所帮助:)

Answer 3

如果您仍然有

unsatisfied link

Android studio over opencv4 中的错误

几次重命名将解决此问题。