How to write an android application offline directory?

Question

Android

Good afternoon!
How to write an application for android offline catalog, which will be able to publish products, and baskets, payment in the application is not needed. The application must be completely offline. I suppose there must be some kind of database with saving to the device?
Maybe there are some video tutorials or materials?
Thanks in advance!

Answer 1

If the directory is small, you can cram all the information into some variable (for example, in JSON format). If the amount of data is larger, but the directory structure is simple, save the database on your computer, for example, in a CSV file and upload it to your project. Next, work with this file.
Another option is to store everything in the database on the phone, but here it is more difficult to fill it.