java.lang.UnsatisfiedLinkError: No implementation found for long org.opencv.core.Mat.n_Mat()

Android调试openCV4Android的时候出现以下错误

java.lang.UnsatisfiedLinkError: No implementation found for long org.opencv.core.Mat.n_Mat() (tried Java_org_opencv_core_Mat_n_1Mat and Java_org_opencv_core_Mat_n_1Mat__)

原因是因为没有加载openCV4Android的库，需要动态加载，在需要用到的activity中添加如下代码：

@Override
    protected 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);
        }
    }

//openCV4Android 需要加载用到
    private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
        @Override
        public void onManagerConnected(int status) {
            switch (status) {
                case LoaderCallbackInterface.SUCCESS: {
                    Log.i(TAG, "OpenCV loaded successfully");
//                    mOpenCvCameraView.enableView();
//                    mOpenCvCameraView.setOnTouchListener(ColorBlobDetectionActivity.this);
                }
                break;
                default: {
                    super.onManagerConnected(status);
                }
                break;
            }
        }
    };