android - 在 OpenCV Camera Android Fragment 中未调用 onCameraFrame 函数

Question

我在 Android 中有一个应用程序，它使用 OpenCV CvCameraViewListener2 来访问 Android 相机。当我从 MainActivity 实现 CvCameraViewListener2 时，此应用程序运行良好，并且我能够看到我的相机的输出。但是，当我从片段实现 CvCameraViewListener2 时，即使没有错误消息并且正在找到 OpenCV 库，也不会调用 onCameraFrame。

片段代码：

public class FdActivity extends Fragment implements CvCameraViewListener2
{
    private static final String TAG = "CameraViewFragment";
    private CameraBridgeViewBase mOpenCvCameraView;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState)
    {
        View rootView = inflater.inflate(R.layout.fragment_fd_activity,
                container, false);

        Log.i(TAG, "called onCreate");
        super.onCreate(savedInstanceState);
        getActivity().getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON | WindowManager.LayoutParams.FLAG_FULLSCREEN);

        getActivity().setContentView(R.layout.fragment_fd_activity);

        mOpenCvCameraView = (CameraBridgeViewBase) getActivity().findViewById(R.id.fd_activity_surface_view);
        mOpenCvCameraView.setVisibility(SurfaceView.VISIBLE);
        mOpenCvCameraView.setCvCameraViewListener(this);

        if (!OpenCVLoader.initDebug()) {
            Log.d(TAG, "Internal OpenCV library not found. Using OpenCV Manager for initialization");
            OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION, getActivity(), mLoaderCallback);
        } else {
            Log.d(TAG, "OpenCV library found inside package. Using it!");
            mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);
        }
        return rootView;
    }

    public FdActivity()
    {
        // TODO Auto-generated constructor stub
    }

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

    @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, getActivity(), mLoaderCallback);
        } else {
            Log.d(TAG, "OpenCV library found inside package. Using it!");
            mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);
        }

    }

    @Override
    public void onCameraViewStarted(int width, int height)
    {
        // TODO Auto-generated method stub

    }

    @Override
    public void onCameraViewStopped()
    {
        // TODO Auto-generated method stub

    }

    @Override
    public Mat onCameraFrame(CvCameraViewFrame inputFrame)
    {
        // TODO Auto-generated method stub
        Log.d(TAG, "got here");
        Log.d(TAG, Integer.toString(inputFrame.rgba().channels()));
        return inputFrame.rgba();
    }

    private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(getActivity())
    {
        @Override
        public void onManagerConnected(int status)
        {
            switch (status)
            {
                case LoaderCallbackInterface.SUCCESS:
                {
                    Log.i(TAG, "OpenCV loaded Successfully");
                    //System.loadLibrary("native-lib");
                    mOpenCvCameraView.enableView();
                }
                break;
                default:
                {
                    super.onManagerConnected(status);
                }
                break;
            }
        }
    };

}

对应的XML代码：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <org.opencv.android.JavaCameraView
        android:id="@+id/fd_activity_surface_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:visibility="gone" />


</LinearLayout>

我不确定为什么片段代码不起作用，即使在 Activity 中完成完全相同的事情也是如此。

标签： androidopencvandroid-fragmentsopencv4android