Announcing requireKTX

2021.06.17. 18h • Márton Braun

So, I got tired of writing code like this.


And seeing others have to write code like this:

val channelType: String = inputData.getString(DATA_CHANNEL_TYPE)!!
val channelId: String = inputData.getString(DATA_CHANNEL_ID)!!
val messageId: String = inputData.getString(DATA_MESSAGE_ID)!!

So I created requireKTX.

What does it do?

It adds extensions so that the code above becomes this:


And this:

val channelType: String = inputData.requireString(DATA_CHANNEL_TYPE)
val channelId: String = inputData.requireString(DATA_CHANNEL_ID)
val messageId: String = inputData.requireString(DATA_MESSAGE_ID)

These extensions exist on various types (Bundle, Intent, WorkManager Data), and for various types of data you’d want to fetch (String, Int, and dozens more).

Instead of giving you nullable types or default values, they’ll throw meaningful exceptions (IllegalStateException or IllegalArgumentException) with nicely worded error messages describing why the value couldn’t be fetched.


You also get nicer getOrNull style methods for all these base types and all types you’d want to fetch, so that the possible nullability is explicit:

val userId: String? = requireArguments().getStringOrNull("user_id")

That’s all!

Check out the library on GitHub, give it a star ⭐, add it to your project, send feedback my way!

You might also like...

A Bit of Gradle Housekeeping

While cleaning is traditionally a spring activity, let me invite you to do it at the end of summer this time around. In this article, we'll take a look at some Gradle configuration that you can probably clean up in your Android project.

Pi Practice App in Compose

In another detailed Jetpack Compose walkthrough, we'll look at implementing a simple app for practicing the digits of pi!

All About Opt-In Annotations

Have you ever encountered APIs that show warnings or errors when you use them, saying that they're internal or experimental? In this guide, you'll learn everything you need to know about opt-in APIs in Kotlin: how to create and use them, and all their nuances.

Wrap-up 2021

Another year over, a new one's almost begun. Here's a brief summary of what I've done in this one.