saving async task

gistfile1.java

/**
     * Async class for communication with I/O for saving taken  photo
     * @param jpeg byte representation of given photo for saving to filesystem
     */
    class SavePhotoTask extends AsyncTask<byte[], String, String> {

        @Override
        protected String doInBackground(byte[]... jpeg) {

            UUID image_name = UUID.randomUUID();
            File photo = new File(Environment.getExternalStorageDirectory(),
                                    PICTURES_DIR + image_name.toString());

            if (photo.exists()) {
                photo.delete();
            }

            try {
                FileOutputStream fos = new FileOutputStream(photo.getPath());

                fos.write(jpeg[0]);
                fos.close();
            }
            catch (java.io.IOException e) {
                Log.e("PictureDemo", "Exception in photoCallback", e);
            }

            return(null);
        }
    }






if (imageBytes != null) {
                    new SavePhotoTask().execute(imageBytes);
                    Toast.makeText(getApplicationContext(),
                                    "Saving photo to Images folder.",
                                    Toast.LENGTH_LONG);
                }
                else {
                    Toast.makeText(getApplicationContext(),
                                    "There's nothing to save",
                                    Toast.LENGTH_LONG);
                }