相机预览被拉伸和倾斜 [英] Camera Preview is stretched and skewed

问题描述

如何解决相机预览中的图像拉伸问题?

How to solve the streching of image in my camera preview?

相机预览类

public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback { 
private SurfaceHolder mHolder; 
private Camera mCamera;

public class CameraPreview extends SurfaceView implements
        SurfaceHolder.Callback {
    private SurfaceHolder mHolder;
    private Camera mCamera;

    public CameraPreview(Context context, Camera camera) {
        super(context);
        mCamera = camera;
        mHolder = getHolder();
        mHolder.addCallback(this);
        // deprecated setting, but required on Android versions prior to 3.0
        mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }

    public void surfaceCreated(SurfaceHolder holder) {
        try {
            // create the surface and start camera preview
            if (mCamera == null) {
                mCamera.setPreviewDisplay(holder);
                mCamera.startPreview();
            }
        } catch (IOException e) {
            Log.d(VIEW_LOG_TAG,
                    "Error setting camera preview: " + e.getMessage());
        }
    }

    public void refreshCamera(Camera camera) {
        if (mHolder.getSurface() == null) {
            // preview surface does not exist
            return;
        }
        // stop preview before making changes
        try {
            mCamera.stopPreview();
        } catch (Exception e) {
            // ignore: tried to stop a non-existent preview
        }
        // set preview size and make any resize, rotate or
        // reformatting changes here
        // start preview with new settings
        setCamera(camera);
        try {
            mCamera.setPreviewDisplay(mHolder);
            mCamera.startPreview();
        } catch (Exception e) {
            Log.d(VIEW_LOG_TAG,
                    "Error starting camera preview: " + e.getMessage());
        }
    }

    public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
        // If your preview can change or rotate, take care of those events here.
        // Make sure to stop the preview before resizing or reformatting it.
        refreshCamera(mCamera);
    }

    public void setCamera(Camera camera) {
        // method to set a camera instance
        mCamera = camera;
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        // TODO Auto-generated method stub
        // mCamera.release();

    }
}

推荐答案

也许您的CameraView的纵横比与相机预览尺寸的纵横比不匹配.
您应该计算CameraView的长宽比，并使用此长宽比找到Camera.Parameters.setPreviewSize()方法的最佳尺寸. 试试这个

Maybe your CameraView's aspect ratio is not match with the aspect ratio of camera preview size.
You should caculate your CameraView's aspect ratio and use this aspect ratio to find best size for Camera.Parameters.setPreviewSize() method. Try this

private Camera.Size getBestPreviewSize(Camera.Parameters parameters, int width, int height) {
    Camera.Size result = null;
    double ratio = width / height;
    double w = 0, h = 0;
    for (Camera.Size size : parameters.getSupportedPreviewSizes()) {
        w = size.width;
        h = size.height;
        if (w / h == ratio) {
            if (result != null) {
                if (w > result.width) {
                    result = size;
                }
            } else {
                result = size;
            }
        }

    }
    return (result);
}

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