Even though we’re in a lambda expression, we can call the function like from any other place of our code. Instead of implementing the code right there, we call our new handler function instead. The first part of the lambda is the parameter: in our case, we call it partItem, and it’s of type PartData (our custom Kotlin-style data class).Īfter the ->, we add the code part. class ClassWithConstructorProperties constructor (var a: Int, var b: Int) )Īgain, we use a lambda expression. Note that the keyword constructor is optional you can skip it. All parameters are automatically available as properties within that class. In Kotlin, you can write the primary constructor directly into the class definition. Let’s start with a class that defines parameters. I’ll spend a short time explaining this, before applying it to the RecyclerView. To understand the most elegant way of adding click handlers to Android, you need to know about higher-order functions and how Kotlin handles those. I’ve updated the source code examples on GitHub to use AndroidX instead of the Android Support libraries. Nothing changes in terms of behavior with regards to our example. Updated on July 4th, 2019: Google is transitioning the additional libraries to AndroidX. The text in this article is still the original. Most importantly, the new solutions now also use Jetpack View Bindings instead of Kotlin synthetics. Updated on December 15th, 2020: the solution projects on GitHub have been migrated to the latest versions and dependencies. To get started with the RecyclerView, follow the steps in the previous article or check out the finished project on GitHub. However, you need to understand a few core concepts of the Kotlin language. Advanced language features of Kotlin make it far easier than it has been with Java. In this article, we add a click listener to a RecyclerView on Android.
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