Question

我的问题是我的应用程序中的内置相机正在裁剪自己拍摄的所有照片。为了比较：

（第一张照片是相机预览的截图，第二张是拍摄的照片），

相同的相机预览小于普通相机预览..为什么？

代码：

public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {

        // start preview with new settings
        try {
            Camera.Parameters parameters = mCamera.getParameters();
            parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
            mCamera.setParameters(parameters);
            mCamera.setDisplayOrientation(90);
            mCamera.setPreviewDisplay(mHolder);
            mCamera.startPreview();

        } catch (Exception e){
            Log.d(TAG, "Error starting camera preview: " + e.getMessage());
        }
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        final int width = resolveSize(getSuggestedMinimumWidth(), widthMeasureSpec);
        final int height = resolveSize(getSuggestedMinimumHeight(), heightMeasureSpec);

        if (mSupportedPreviewSizes != null) {
            mPreviewSize = getOptimalPreviewSize(mSupportedPreviewSizes, width, height);
        }

        if (mPreviewSize!=null) {
            float ratio;
            if(mPreviewSize.height >= mPreviewSize.width)
                ratio = (float) mPreviewSize.height / (float) mPreviewSize.width;
            else
                ratio = (float) mPreviewSize.width / (float) mPreviewSize.height;

            // One of these methods should be used, second method squishes preview slightly
            setMeasuredDimension(width, (int) (width * ratio));
            //        setMeasuredDimension((int) (width * ratio), height);
        }
    }

    private Camera.Size getOptimalPreviewSize(List<Camera.Size> sizes, int w, int h) {
        final double ASPECT_TOLERANCE = 0.1;
        double targetRatio = (double) h / w;

        if (sizes == null)
            return null;

        Camera.Size optimalSize = null;
        double minDiff = Double.MAX_VALUE;

        int targetHeight = h;

        for (Camera.Size size : sizes) {
            double ratio = (double) size.height / size.width;
            if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE)
                continue;

            if (Math.abs(size.height - targetHeight) < minDiff) {
                optimalSize = size;
                minDiff = Math.abs(size.height - targetHeight);
            }
        }

        if (optimalSize == null) {
            minDiff = Double.MAX_VALUE;
            for (Camera.Size size : sizes) {
                if (Math.abs(size.height - targetHeight) < minDiff) {
                    optimalSize = size;
                    minDiff = Math.abs(size.height - targetHeight);
                }
            }
        }

        return optimalSize;
    }

如果重要的是GalleryFragment代码：

// To create bitmap squared
    private Bitmap processImage(byte[] data) throws IOException {
        // Determine the width/height of the image
        int width = camera.getParameters().getPictureSize().width;
        int height = camera.getParameters().getPictureSize().height;

        // Load the bitmap from the byte array
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inPreferredConfig = Bitmap.Config.ARGB_8888;
        Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length, options);

        // Rotate and crop the image into a square
        int croppedWidth = (width > height) ? height : width;
        int croppedHeight = (width > height) ? height : width;

        Matrix matrix = new Matrix();
        matrix.postRotate(90);
        Bitmap cropped = Bitmap.createBitmap(bitmap, 0, 0, croppedWidth, croppedHeight, matrix, true);
        bitmap.recycle();

        // Scale down to the output size
        Bitmap scaledBitmap = Bitmap.createScaledBitmap(cropped, 800, 800, true);
        cropped.recycle();


        return scaledBitmap;
    }

private Camera.PictureCallback pictureCallback = new Camera.PictureCallback() {

        @Override
        public void onPictureTaken(byte[] data, Camera camera) {
            Log.i(TAG, "Saving a bitmap to file");

            File pictureFile = cameraPreview.getOutputMediaFile(MEDIA_TYPE_IMAGE);
            if (pictureFile == null){
                Log.d(TAG, "Error creating media file, check storage permissions");
                return;
            }

            try {
                FileOutputStream fos = new FileOutputStream(pictureFile);
                fos.write(data);
                fos.close();
                Log.i(TAG, "Stop saving a bitmap to file");
            } catch (FileNotFoundException e) {
                Log.d(TAG, "File not found: " + e.getMessage());
            } catch (IOException e) {
                Log.d(TAG, "Error accessing file: " + e.getMessage());
            }

            PictureData.notifyMediaScannerService(getContext(), pictureFile.getPath());

            try {
                Uri uri = Converter.getImageUri(getContext(), processImage(data));
                Intent intent = new Intent(getActivity(), PictureViewActivity.class)
                        .putExtra("Uri", uri.toString());
                startActivity(intent);
            } catch (IOException e) {
                e.printStackTrace();
            }

        }
    };

反馈，祝你有个美好的夜晚

相机裁剪照片

0 个答案: