onCameraViewStarted and onCameraFrame never called - black view

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Hi,

I am trying to set up OpenCV with Android and just get a black screen whatever I do. OpenCV loads successfully, and enableView is called, yet onCameraViewStarted and onCameraFrame are never called. Some help would be greatly appreciated. Here is the MainActivity.java code:

public class MainActivity extends Activity implements CameraBridgeViewBase.CvCameraViewListener2 {
private static final String TAG = "MainActivity";
private CameraBridgeViewBase mOpenCvCameraView;

private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
    @Override
    public void onManagerConnected(int status) {
        switch (status) {
            case LoaderCallbackInterface.SUCCESS:
            {
                Log.i(TAG, "Manager connected");
                mOpenCvCameraView.enableView();
            } break;
            default:
            {
                super.onManagerConnected(status);
            } break;
        }
    }
};

@Override
protected void onCreate(Bundle savedInstanceState) {
    Log.i(TAG, "called onCreate");
    super.onCreate(savedInstanceState);
    getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

    setContentView(R.layout.activity_main);

    if(permission()){
        mOpenCvCameraView = (CameraBridgeViewBase) findViewById(R.id.camera_view);
        mOpenCvCameraView.setVisibility(SurfaceView.VISIBLE);
        mOpenCvCameraView.setCvCameraViewListener(this);
    }
}

@Override
public void onCameraViewStarted(int width, int height) {
    Log.i(TAG, "called onCameraViewStarted");
}

@Override
public void onCameraViewStopped() {
}

@Override
public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) {
    Log.i(TAG, "called onCameraFrame");
    return inputFrame.rgba();
}

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

@Override
public void onResume()
{
    Log.i(TAG, "called resume");
    super.onResume();

    if (!OpenCVLoader.initDebug()) {
        Toast.makeText(this, "There are problems with OpenCV",
                Toast.LENGTH_SHORT).show();
    } else {
        mLoaderCallback.onManagerConnected(BaseLoaderCallback.SUCCESS);
    }
}

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

private boolean permission(){
    if (ContextCompat.checkSelfPermission(MainActivity.this,
            Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(this, new String[]
                        {Manifest.permission.CAMERA},
                50);
    } else {
        return true;
    }
    return false;
}

}