Andriod Studio OpenCV 3.2, Cannot open video file or android camera with native OpenCV

Question

I\'m currently working on Android native image processing with camera/video.

I\'m using OpenCV 3.2 to capture and process image.
The problem is that I cannot

Answer 1

I failed to open camera inside Native code, instead I ended up using android OpenCV Camera implementation, opencv.android.CameraBridgeViewBase.

MainActivity.java

public class MainActivity extends AppCompatActivity implements CameraBridgeViewBase.CvCameraViewListener2 {

    private CameraBridgeViewBase mCvCamView;
    Mat matInput, matOutput;

    private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
        @Override
        public void onManagerConnected(int status) {
            switch (status) {
                case LoaderCallbackInterface.SUCCESS:
                    mCvCamView.enableView();
                    break;
                default:
                    super.onManagerConnected(status);
                    break;
            }
        }
    };


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mCvCamView = (CameraBridgeViewBase)findViewById(R.id.cam_view);
        mCvCamView.setVisibility(SurfaceView.VISIBLE);
        mCvCamView.setCvCameraViewListener(this);
        mCvCamView.setCameraIndex(1); // front-camera(1),  back-camera(0)
        mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);
    }

    @Override
    public void onPause()
    {
        super.onPause();
        if (mCvCamView != null)
            mCvCamView.disableView();
    }

    @Override
    public void onResume()
    {
        super.onResume();

        if (!OpenCVLoader.initDebug()) {
            Log.d(TAG, "onResume :: Internal OpenCV library not found.");
            OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_3_2_0, this, mLoaderCallback);
        } else {
            Log.d(TAG, "onResume :: OpenCV library found inside package. Using it!");
            mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);
        }
    }

    public void onDestroy() {
        super.onDestroy();
        if (mCvCamView != null)
            mCvCamView.disableView();
    }

    @Override
    public void onCameraViewStarted(int width, int height) {
        if ( matOutput == null || matOutput.empty() )
            matOutput = new Mat(height, width, CvType.CV_8UC4, new Scalar(255, 0, 0, 255));
    }

    @Override
    public void onCameraViewStopped() {}

    @Override
    public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) {
        matInput = inputFrame.rgba();
        Native.extract(matInput.getNativeObjAddr(), matOutput.getNativeObjAddr());
        return matOutput;
    }

}

activity_main.xml