android 照片旋轉並保存

    /**
     * 讀取圖片屬性：旋轉的角度
     * @param path 圖片絕對路徑
     * @return degree旋轉的角度
     */
    public 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;
    }


 /*
    * 旋轉圖片 
    * @param angle 
    * @param bitmap 
    * @return Bitmap 
    */ 
   public Bitmap rotaingImageView(int angle , Bitmap bitmap) {  
       //旋轉圖片 動作   
       Matrix matrix = new Matrix();
       matrix.postRotate(angle);
       // 創建新的圖片   
       return Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);  
   }


/***
     * 將bitmap保存在SD jpeg格式
     * 
     * @param bitmap
     *            圖片bitmap
     * @param filePath
     *            要保存圖片路徑
     * @param quality
     *            壓縮質量值
     */
    public void saveImage(Bitmap bitmap, String filePath, int quality) {
        FileOutputStream fileOutputStream = null;
        try {
            fileOutputStream = new FileOutputStream(filePath);
            bitmap.compress(CompressFormat.JPEG, quality, fileOutputStream);
            fileOutputStream.flush();
            fileOutputStream.close();
            // 如果圖片還沒有回收，強制回收
            if (!bitmap.isRecycled()) {
                bitmap.recycle();
                System.gc();
            }
        } catch (Exception e) {
        }
    }


bitmap=ImageCompress.decodeSampledBitmapFromResource(filename, 480, 800);
                    
                    //圖片旋轉
                    int Degree = imageUtils.readPictureDegree(filename);
                    bitmap = imageUtils.rotaingImageView(Degree, bitmap);
                    //保存圖片到SD卡
                    //imageCompress.saveImage(bitmap, filename);
                    imageCompress.saveImage(bitmap, filename,90);

 

/***
     * 動態設置inSampleSize 倍數
     * 
     * @param pathName
     *            圖片路徑
     * @param reqWidth
     *            要壓縮的寬度
     * @param reqHeight
     *            要壓縮的高度
     * @return
     */
    public static Bitmap decodeSampledBitmapFromResource(String pathName,
            int reqWidth, int reqHeight) {
        // 首先設置 inJustDecodeBounds=true 來獲取圖片尺寸
        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(pathName, options);
        // 計算 inSampleSize 的值
        options.inSampleSize = calculateInSampleSize(options, reqWidth,
                reqHeight);

        // 根據計算出的 inSampleSize 來解碼圖片生成Bitmap
        options.inJustDecodeBounds = false;
        return BitmapFactory.decodeFile(pathName, options);
    }