Android Programming with Kotlin for Beginners

More advanced persistence

Let's think about what we need to do. We want to save a bunch of notes to the internal storage. Being more specific, we want to store a selection of Strings and related Boolean values. These Strings and Boolean values represent the user's note title, the text, and whether it is a to-do, important, or an idea.

Given what we already know about the SharedPreferences class, at first glance, this might not seem especially challenging – until we dig a little deeper into our requirements. What if the user loves our app and ends up with 100 notes? We would need 100 identifiers for key-value pairs. Not impossible, but starting to get awkward.

Now, imagine that we wanted to enhance the app and give the user the ability to add dates ...