I want to create some mobile apps. Data to come from a host, data to be acquired from the mobile device & (eventually) sent back to the host. Probably going to need local storage for when users don’t have internet access. Want to interact with functions on the mobile device e.g. GPS and handwriting, maybe barcode reading. Initial target is Android, but also interested in iOS.
What are (all) the possible ways of doing this reasonably quickly & cheaply?
What should I be reading up on?
Thanks, in advance.