怎么SDCard上的获取相册照片

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private String getRealPathFromURI(Uri contentUri) {
        Cursor cursor = null;
        String result = contentUri.toString();
        String[] proj = {MediaStore.Images.Media.DATA};
        cursor = managedQuery(contentUri, proj, null, null, null);
        if(cursor == null) throw new NullPointerException("reader file field");
        if (cursor != null) {
            int column_index = cursor
                    .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            cursor.moveToFirst();
            // 最后根据索引值获取图片路径
            result = cursor.getString(column_index);
             try
                {
                    //4.0以上的版本会自动关闭 (4.0--14;; 4.0.3--15)
                    if(Integer.parseInt(Build.VERSION.SDK) < 14)
                    {
                        cursor.close();
                    }
                }catch(Exception e)
                {
                    Log.e(TAG, "error:" + e);
                }
        }
        return result;
    }

//path = path.substring(path.indexOf("/sdcard"), path.length());  目录不要写死 。