Clean Strings Handling in Android
In this article, you’ll learn how to use string resources inside ViewModel or any place you want, no matter what the source of the string is!
Why passing strings is problematic?
We want to treat all strings in Android as equals, whether they’re from strings.xml , backend or user-created content. You’ll need an abstraction representing all of these values to do so. We’ll call it StringHolder .
The StringHolder interface
Luckily, in Kotlin, we can leverage sealed interface for that:
In code, it’ll look like this:
This can be a domain layer model if it has some dependencies on Android already. If you’re doing it the proper and fully clean way, then you can use it without the @StringRes annotation.
Get the value
Now, we can pass these strings around as if they were equals, but we also need a way to get values through a single function. Here are 3 most common methods for that:
Example usage
Now that we have our extension functions in place, it’s very easy to use the class in our UI:
If you need it in data layer classes or Framgents you can access it through Resources or Context :
