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我刚刚在android studio中使用了Android NDK和openCV。android studio中的openCV和NDK集成2.1.2
我按照所有的步骤（包括进口的OpenCV-SDK）这里https://www.learn2crack.com/2016/03/setup-opencv-sdk-android-studio.html提到的，随后从GitHub样品基本教程OpenCV的 https://github.com/opencv/opencv/tree/master/samples/android。凡在Tutorial2它使用JNI文件夹C/C++代码时，我编译和运行我正在遵循以下错误
07-27 17:55:43.407 13197-13197/com.sample.opencvtest E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.sample.opencvtest, PID: 13197
java.lang.UnsatisfiedLinkError: dalvik.system.PathClassLoader[DexPathList[[zip file "/data/app/com.sample.opencvtest-1/base.apk"],nativeLibraryDirectories=[/data/app/com.sample.opencvtest-1/lib/arm, /data/app/com.sample.opencvtest-1/base.apk!/lib/armeabi-v7a, /vendor/lib, /system/lib]]] couldn't find "libopenCVLibrary310.so"
at java.lang.Runtime.loadLibrary(Runtime.java:367)
at java.lang.System.loadLibrary(System.java:1076)
at com.sample.opencvtest.Tutorial2$1.onManagerConnected(Tutorial2.java:54)
at com.sample.opencvtest.Tutorial2.onResume(Tutorial2.java:121)
at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1258)
at android.app.Activity.performResume(Activity.java:6327)
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3092)
at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3134)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2481)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
错误发生在语句中的应用
// Load native library after(!) OpenCV initialization
System.loadLibrary("openCVLibrary310"); // Confusing part here what should be pointed here in place of "openCVLibrary"
下面是MainActivity代码
public class Tutorial2 extends Activity implements CameraBridgeViewBase.CvCameraViewListener2
{
private static final String TAG = "OCVSample::Activity";
private static final int VIEW_MODE_RGBA = 0;
private static final int VIEW_MODE_GRAY = 1;
private static final int VIEW_MODE_CANNY = 2;
private static final int VIEW_MODE_FEATURES = 5;
private int mViewMode;
private Mat mRgba;
private Mat mIntermediateMat;
private Mat mGray;
private MenuItem mItemPreviewRGBA;
private MenuItem mItemPreviewGray;
private MenuItem mItemPreviewCanny;
private MenuItem mItemPreviewFeatures;
private CameraBridgeViewBase mOpenCvCameraView;
private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this)
{
@Override
public void onManagerConnected(int status)
{
switch (status)
{
case LoaderCallbackInterface.SUCCESS:
{
Log.i(TAG, "OpenCV loaded successfully");
// Load native library after(!) OpenCV initialization
System.loadLibrary("openCVLibrary310");
mOpenCvCameraView.enableView();
}
break;
default:
{
super.onManagerConnected(status);
}
break;
}
}
};
public Tutorial2()
{
Log.i(TAG, "Instantiated new " + this.getClass());
}
/**
* Called when the activity is first created.
*/
@Override
public void onCreate(Bundle savedInstanceState)
{
Log.i(TAG, "called onCreate");
super.onCreate(savedInstanceState);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
setContentView(R.layout.tutorial2_surface_view);
mOpenCvCameraView = (CameraBridgeViewBase) findViewById(R.id.tutorial2_activity_surface_view);
mOpenCvCameraView.setVisibility(CameraBridgeViewBase.VISIBLE);
mOpenCvCameraView.setCvCameraViewListener(this);
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
Log.i(TAG, "called onCreateOptionsMenu");
mItemPreviewRGBA = menu.add("Preview RGBA");
mItemPreviewGray = menu.add("Preview GRAY");
mItemPreviewCanny = menu.add("Canny");
mItemPreviewFeatures = menu.add("Find features");
return true;
}
@Override
public void onPause()
{
super.onPause();
if (mOpenCvCameraView != null)
mOpenCvCameraView.disableView();
}
@Override
public void onResume()
{
super.onResume();
if (!OpenCVLoader.initDebug())
{
Log.d(TAG, "Internal OpenCV library not found. Using OpenCV Manager for initialization");
OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_3_0_0, this, mLoaderCallback);
}
else
{
Log.d(TAG, "OpenCV library found inside package. Using it!");
mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);
}
}
public void onDestroy()
{
super.onDestroy();
if (mOpenCvCameraView != null)
mOpenCvCameraView.disableView();
}
public void onCameraViewStarted(int width, int height)
{
mRgba = new Mat(height, width, CvType.CV_8UC4);
mIntermediateMat = new Mat(height, width, CvType.CV_8UC4);
mGray = new Mat(height, width, CvType.CV_8UC1);
}
public void onCameraViewStopped()
{
mRgba.release();
mGray.release();
mIntermediateMat.release();
}
public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame)
{
final int viewMode = mViewMode;
switch (viewMode)
{
case VIEW_MODE_GRAY:
// input frame has gray scale format
Imgproc.cvtColor(inputFrame.gray(), mRgba, Imgproc.COLOR_GRAY2RGBA, 4);
break;
case VIEW_MODE_RGBA:
// input frame has RBGA format
mRgba = inputFrame.rgba();
break;
case VIEW_MODE_CANNY:
// input frame has gray scale format
mRgba = inputFrame.rgba();
Imgproc.Canny(inputFrame.gray(), mIntermediateMat, 80, 100);
Imgproc.cvtColor(mIntermediateMat, mRgba, Imgproc.COLOR_GRAY2RGBA, 4);
break;
case VIEW_MODE_FEATURES:
// input frame has RGBA format
mRgba = inputFrame.rgba();
mGray = inputFrame.gray();
FindFeatures(mGray.getNativeObjAddr(), mRgba.getNativeObjAddr());
break;
}
return mRgba;
}
public boolean onOptionsItemSelected(MenuItem item)
{
Log.i(TAG, "called onOptionsItemSelected; selected item: " + item);
if (item == mItemPreviewRGBA)
{
mViewMode = VIEW_MODE_RGBA;
}
else if (item == mItemPreviewGray)
{
mViewMode = VIEW_MODE_GRAY;
}
else if (item == mItemPreviewCanny)
{
mViewMode = VIEW_MODE_CANNY;
}
else if (item == mItemPreviewFeatures)
{
mViewMode = VIEW_MODE_FEATURES;
}
return true;
}
public native void FindFeatures(long matAddrGr, long matAddrRgba);
}
我已经app--> src--> main下添加jniLibs文件夹，复制armeabi-v7a和x86_64 folde来自openCV-SDK-->native-->libs的rs。还增加了jni文件夹app--> src--> main之下，有三个文件Android.mk, Application.mk and jni_part.cpp
jni_part.cpp代码
#include <jni.h>
#include <opencv2/core.hpp>
#include <opencv2/imgproc.hpp>
#include <opencv2/features2d.hpp>
#include <vector>
using namespace std;
using namespace cv;
extern "C" {
JNIEXPORT void JNICALL Java_org_opencv_samples_tutorial2_Tutorial2Activity_FindFeatures(JNIEnv*, jobject, jlong addrGray, jlong addrRgba);
JNIEXPORT void JNICALL Java_org_opencv_samples_tutorial2_Tutorial2Activity_FindFeatures(JNIEnv*, jobject, jlong addrGray, jlong addrRgba)
{
Mat& mGr = *(Mat*)addrGray;
Mat& mRgb = *(Mat*)addrRgba;
vector<KeyPoint> v;
Ptr<FeatureDetector> detector = FastFeatureDetector::create(50);
detector->detect(mGr, v);
for(unsigned int i = 0; i < v.size(); i++)
{
const KeyPoint& kp = v[i];
circle(mRgb, Point(kp.pt.x, kp.pt.y), 10, Scalar(255,0,0,255));
}
}
}
我在这里停留。任何类型的帮助，将不胜感激