Build me a Apk of Mapping Farm Areas, where the users can mark points, polygons, and can share that by e-mail and another ways. is need to have the function of build a grade of points based in the area of the polygon (It only Math). that are similar apk's in play store, but i need a exclusive of my company (could be used to be based on).
Work with QR code could be a differential
PS: Apk Screenshot in attachments