Android 三星手机拍照图片旋转处理

     三星拍照后，图片竟然是旋转的，众多手机唯有三星拍照是旋转的，但是你又不能不处理。

   首先你要先判断这张图片有木有旋转，图片都是自带这些信息的，方法如下：

 /**     * 读取图片属性：旋转的角度     *     * @param path 图片绝对路径     * @return degree旋转的角度     */    public static int readPictureDegree(String path) {        int degree = 0;        try {            ExifInterface exifInterface = new ExifInterface(path);            int orientation = exifInterface.getAttributeInt(                    ExifInterface.TAG_ORIENTATION,                    ExifInterface.ORIENTATION_NORMAL);            switch (orientation) {                case ExifInterface.ORIENTATION_ROTATE_90:                    degree = 90;                    break;                case ExifInterface.ORIENTATION_ROTATE_180:                    degree = 180;                    break;                case ExifInterface.ORIENTATION_ROTATE_270:                    degree = 270;                    break;            }        } catch (IOException e) {            e.printStackTrace();        }        return degree;    }

当然三星手机拍照一般都是：

degree = 90;

如果degree != 0 ，就说明图片是旋转的。假设我们需要发送一张图片，不可能对原来路径下的图片进行修改，所以需要把要处理的图片在复制一份再进行处理；方法如下：

/**     * 复制文件     *     * @param oldPath     * @param newPath     */    public static void copyFile(String oldPath, String newPath) {        try {            int bytesum = 0;            int byteread = 0;            File oldfile = new File(oldPath);            if (oldfile.exists()) { //文件存在时                InputStream inStream = new FileInputStream(oldPath); //读入原文件                FileOutputStream fs = new FileOutputStream(newPath);                byte[] buffer = new byte[1444];                int length;                while ((byteread = inStream.read(buffer)) != -1) {                    bytesum += byteread; //字节数 文件大小                    System.out.println(bytesum);                    fs.write(buffer, 0, byteread);                }                inStream.close();            }        } catch (Exception e) {            System.out.println("复制单个文件操作出错");            e.printStackTrace();        }    }

最后再对相应的图片做旋转处理，先贴上图片旋转的处理方法：

 /**     * 旋转图片     *     * @param angle     * @param bitmap     * @return Bitmap     */    public static Bitmap rotaingImageView(int angle, Bitmap bitmap) {        // 旋转图片 动作        Matrix matrix = new Matrix();        matrix.postRotate(angle);        // 创建新的图片        Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0,                bitmap.getWidth(), bitmap.getHeight(), matrix, true);        return resizedBitmap;    }

这里传入相应的角度和bitmap就行，最后贴上图片旋转处理的全部代码：

/**     * 旋转的图片生成正的     *     * @param path     */    public static void rotaingDegreeImage(String path) {        BitmapFactory.Options bitmapOptions = new BitmapFactory.Options();        //获取宽高度        bitmapOptions.inJustDecodeBounds = true;        BitmapFactory.decodeFile(path, bitmapOptions);        /**         * 计算sampleSize最优值         */        bitmapOptions.inSampleSize = computeSampleSize(bitmapOptions, -1, 2048 * 1536);        bitmapOptions.inJustDecodeBounds = false;        int degree = readPictureDegree(path);        Bitmap cameraBitmap = BitmapFactory.decodeFile(path, bitmapOptions);        /**         * 把图片旋转为正的方向         */        cameraBitmap = rotaingImageView(degree, cameraBitmap);        FileOutputStream out;        try {            out = new FileOutputStream(path);            cameraBitmap.compress(Bitmap.CompressFormat.JPEG, 100, out);        } catch (FileNotFoundException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }

这里还用到：

computeSampleSize（）

 /**     * 计算sampleSize最优值     *     * @param options     * @param minSideLength     * @param maxNumOfPixels     * @return     */    public static int computeSampleSize(BitmapFactory.Options options, int minSideLength, int maxNumOfPixels) {        int initialSize = computeInitialSampleSize(options, minSideLength, maxNumOfPixels);        int roundedSize;        if (initialSize <= 8) {            roundedSize = 1;            while (roundedSize < initialSize) {                roundedSize <<= 1;            }        } else {            roundedSize = (initialSize + 7) / 8 * 8;        }        return roundedSize;    }

中间调用：

 private static int computeInitialSampleSize(BitmapFactory.Options options, int minSideLength, int maxNumOfPixels) {        double w = options.outWidth;        double h = options.outHeight;        int lowerBound = (maxNumOfPixels == -1) ? 1 : (int) Math.ceil(Math.sqrt(w * h / maxNumOfPixels));        int upperBound = (minSideLength == -1) ? 128 : (int) Math.min(Math.floor(w / minSideLength), Math.floor(h / minSideLength));        if (upperBound < lowerBound) {            // return the larger one when there is no overlapping zone.            return lowerBound;        }        if ((maxNumOfPixels == -1) && (minSideLength == -1)) {            return 1;        } else if (minSideLength == -1) {            return lowerBound;        } else {            return upperBound;        }    }

有了这几个方法。一切OK。