// save to db
private void saveItem() {
	ContentValues values = new ContentValues();
		values.put(InventoryEntry.COLUMN_IMAGE, BitmapUtility.bitmapToBlob(mBitmap));
}

// retrieve from db (via CursorLoader)
public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) {
	int imageIndex = cursor.getColumnIndex(InventoryEntry.COLUMN_IMAGE);
	byte[] imageBlob = cursor.getBlob(imageIndex);

	if (imageBlob != null && imageBlob.length > 0 && !flagBitmapSet) {
		mBitmap = BitmapUtility.blobToBitmap(imageBlob);
		//TODO: display image
	}
}

// convert from bitmap to byte array
private byte[] bitmapToBlob(Bitmap bitmap) {
	byte[] byteStream = new byte[0];
	try {
		ByteArrayOutputStream stream = new ByteArrayOutputStream();
		bitmap.compress(Bitmap.CompressFormat.JPEG, 80, stream);
		byteStream = stream.toByteArray();
		stream.close();
	} catch (NullPointerException e) {
		e.printStackTrace();
	} catch (IOException e) {
		e.printStackTrace();
	} finally {
		return byteStream;
	}
}

// convert from byte array to bitmap
private Bitmap blobToBitmap(byte[] bytes) {
	return BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
}