使用JavaCameraView的自定义类会导致应用崩溃

Question

我正在使用android的OpenCV，我正在尝试设置自定义帧率。现在我正在尝试设置帧率的范围。我也在尝试设置自定义分辨率

我遵循openCV教程3相机控制。当我在我的设备上运行应用程序时，它崩溃了。我用的是Nexus 7 2013平板电脑

下面是我的代码:

public class Tutorial2Activity extends Activity implements 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 CustomizeCameraView   mOpenCvCameraView;
    private List<Size> mResolutionList;
    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("mixed_sample");
                    mOpenCvCameraView.enableView();
                } break;
                default:
                {
                    super.onManagerConnected(status);
                } break;
            }
        }
    };
    public Tutorial2Activity() {
        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 = (CustomizeCameraView) findViewById(R.id.tutorial2_activity_surface_view);
        mOpenCvCameraView.setVisibility(SurfaceView.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();
        OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_3, this, mLoaderCallback);
    }
    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);
        mResolutionList = mOpenCvCameraView.getResolutionList();

        int mFrameWidth = (int) mResolutionList.get(7).width;
        int mFrameHeight = (int) mResolutionList.get(7).height;
        mOpenCvCameraView.setResolution(mFrameHeight,mFrameWidth);
        //mOpenCvCameraView.setPreviewFPS(1000, 31000);

    }
    public void onCameraViewStopped() {
        mRgba.release();
        mGray.release();
        mIntermediateMat.release();
    }
    public Mat onCameraFrame(CvCameraViewFrame inputFrame) {
        return inputFrame.rgba();
    }
    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);
}

和JavaCameraView自定义类

 public class CustomizeCameraView extends JavaCameraView{
    public CustomizeCameraView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
     //@SuppressWarnings("deprecation")
    public void setPreviewFPS(double  min, double max){
            Camera.Parameters params = mCamera.getParameters();
            params.setPreviewFpsRange((int)(min*1000), (int)(max*1000));
            //params.setPreviewFrameRate(min);
            mCamera.setParameters(params);
           // mCamera.getSupportedPreviewFpsRange();
        }
     public List<Size> getResolutionList() {
         return mCamera.getParameters().getSupportedPreviewSizes();
          // return mCamera.getParameters().getPictureSize();
        }
     public void setResolution(int h,int w){
         Camera.Parameters params = mCamera.getParameters();
         params.setPreviewSize(mFrameWidth, mFrameHeight);
            mCamera.setParameters(params); // mCamera is a Camera object
     }
     public Size getResolution() {
            return mCamera.getParameters().getPreviewSize();
        }
}

， logcat输出如下:

05-23 14:27:18.192: E/AndroidRuntime(29339): FATAL EXCEPTION: main
05-23 14:27:18.192: E/AndroidRuntime(29339): Process: org.opencv.samples.tutorial2, PID: 29339
05-23 14:27:18.192: E/AndroidRuntime(29339): java.lang.RuntimeException: Unable to start activity ComponentInfo{org.opencv.samples.tutorial2/org.opencv.samples.tutorial2.Tutorial2Activity}: java.lang.ClassCastException: org.opencv.android.JavaCameraView cannot be cast to org.opencv.samples.tutorial2.CustomizeCameraView

Answer 1

我找到了解决方案

问题是我的布局文件。我插入了视频显示标签，直接使用JavaCameraView，而不是使用从JavaCameraView继承的类

问题:

< org.opencv.JavaCameraView />

纠正:

< "package_name"."Class_name_that_you_inherited_from_JavaCameraView" />

我希望它能帮助别人:)