带有 OpenCV3.0.0 Android 的相机闪光灯无法正常工作

Question

我正在使用opencv 视频流编写代码，我想在第一次打开相机时打开相机闪光灯。我已经实现了一个从JavaCameraView 扩展的新类，但是当我调用这一行时应用程序崩溃：

mOpencvCameraView.setEffect(Camera.Parameters.FLASH_MODE_ON);

类如下： 我的代码

public class CameraCustomize extends JavaCameraView  implements Camera.PictureCallback {
private String mPictureFileName;

public CameraCustomize(Context context, AttributeSet attrs) {
    super(context, attrs);
}
public List<String> getEffectList() {
    return mCamera.getParameters().getSupportedFlashModes();
}
public boolean isEffectSupported() {
    return (mCamera.getParameters().getFlashMode() != null);
}
public String getEffect() {
    return mCamera.getParameters().getFlashMode();
}
public void setEffect(String effect) {
    mCamera.getParameters();// here where i get the Error
    Camera.Parameters params = mCamera.getParameters();
    params.setFlashMode(effect);
    mCamera.setParameters(params);

}
public List<Camera.Size> getResolutionList() {
    return mCamera.getParameters().getSupportedPreviewSizes();
}
public void setResolution(int w, int h) {
    disconnectCamera();
    mMaxHeight = h;
    mMaxWidth = w;
    connectCamera(getWidth(), getHeight());
}

public Camera.Size getResolution() {
    return mCamera.getParameters().getPreviewSize();
}

public void takePicture(final String fileName) {
    this.mPictureFileName = fileName;
    // Postview and jpeg are sent in the same buffers if the queue is not empty when performing a capture.
    // Clear up buffers to avoid mCamera.takePicture to be stuck because of a memory issue
    mCamera.setPreviewCallback(null);

    // PictureCallback is implemented by the current class
    mCamera.takePicture(null, null, this);
}

@Override
public void onPictureTaken(byte[] data, Camera camera) {
    // The camera preview was automatically stopped. Start it again.
    mCamera.startPreview();
    mCamera.setPreviewCallback(this);

    // Write the image in a file (in jpeg format)
    try {
        FileOutputStream fos = new FileOutputStream(mPictureFileName);
        fos.write(data);
        fos.close();
    } catch (java.io.IOException e) {
        Log.e("PictureDemo", "Exception in photoCallback", e);
    }

}

public void cameraRelease() {
    if(mCamera != null){
        mCamera.release();
    }
}
}

请任何人都可以帮助我，或建议另一种启动相机闪光灯的方法。 谢谢你的高级。

Answer 1

我通过在这个链接Using Camera LED Flash with OpenCV on Android应用这个类找到了解决方案

效果很好:)

这是我实现的类：

private static final String TAG = "Sample::Tutorial2View";

private Context my reference;

private static boolean isFlashLightON = false;

public Tutorial2View(Context context, AttributeSet attrs) {
super(context, attrs);
this.myreference = context;
}

public List<String> getEffectList() {
return mCamera.getParameters().getSupportedColorEffects();
}

public boolean isEffectSupported() {
return (mCamera.getParameters().getColorEffect() != null);
}

public String getEffect() {
return mCamera.getParameters().getColorEffect();
}

public void setEffect(String effect) {
Camera.Parameters params = mCamera.getParameters();
params.setColorEffect(effect);
mCamera.setParameters(params);
}

public List<Size> getResolutionList() {
return mCamera.getParameters().getSupportedPreviewSizes();
}

public void setResolution(Size resolution) {
disconnectCamera();
mMaxHeight = resolution.height;
mMaxWidth = resolution.width;
connectCamera(getWidth(), getHeight());
}

public Size getResolution() {
return mCamera.getParameters().getPreviewSize();
}

// Setup the camera
public void setupCameraFlashLight() {
Camera  camera = mCamera;
if (camera != null) {
Parameters params = camera.getParameters();

if (params != null) {
    if (isFlashLightON) {
        isFlashLightON = false;
        params.setFlashMode(Parameters.FLASH_MODE_OFF);
        camera.setParameters(params);
        camera.startPreview();
    } else {
        isFlashLightON = true;
        params.setFlashMode(Parameters.FLASH_MODE_TORCH);
        camera.setParameters(params);
        camera.startPreview();

        }
    }
}

}