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Questions tagged [kotlin-android-extensions]

Questions related to Kotlin Android Extensions

Kotlin Android Extensions

721 questions
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Do Kotlin Android Extensions cache the synthetic properties or each time it calls findViewById()?

If I have a simple custom view: myitem.xml
WindRider
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Kotlin - What is the use of class without body?

In Kotlin both the header and the body are optional; if the class has no body, curly braces can be omitted. So we can define class like, class Empty What is the use of this type of class?
paril
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Varargs Kotlin Java interop not working properly

For the makeSceneTransitionAnimation there are two static functions public static ActivityOptionsCompat makeSceneTransitionAnimation(Activity activity, View sharedElement, String sharedElementName) and public static…
Josh Feinberg
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Kotlin Android extensions and retained fragment

I am using Kotlin Android extensions in my project and I came across some behavior that I am unable to understand. I use this code to retain my fragment in the activity: val fragment = fragmentManager.findFragmentByTag("hello") ?:…
Lamorak
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Switch to Kotlin 1.3.30 breaks hashCode only on Android API 21

I switched over my Android project from 1.3.20 to 1.3.30 and I am suddenly getting following exceptions from some of the classes when they call hashCode() method. Note, I am getting this exception only on Android platform API 21 & 22, beyond Android…
Subodh Nijsure
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Using android-extensions`s Parcelize annotation on objects that extends Parceable sealed classes

I'm using kotlin android extensions to auto generate my Parcelables, but given the following code I'm getting 'Parcelable' should be a class. the code: sealed class Action : Parcelable @Parcelize object Run : Action() @Parcelize data class Ask( …
ademar111190
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Experimental features in Android extension is good for Production release

I'm using the @Parcelize feature in android development using Kotlin language. To use them I have done the below modifications in build.gradle file. apply plugin: 'kotlin-android-extensions' then androidExtensions { experimental = true } I'm…
Swaminathan V
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Adding kapt to use Room causes compile errors

I added apply plugin: 'kotlin-kapt' to be able to use Rooms annotation proccessor: compile "android.arch.persistence.room:runtime:1.0.0" kapt "android.arch.persistence.room:compiler:1.0.0" However when I build my project I get: Folder…
Derek
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Kotlin function required Nothing but defined as a different type

I've defined a class like so abstract class MvpViewHolder

(itemView: View) : RecyclerView.ViewHolder(itemView) where P : BasePresenter { protected var presenter: P? = null fun bindPresenter(presenter: P): Unit { …

Rafa
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ButterKnife @OnClick annotation not working in Kotlin fragment

I like the readability of the @OnClick attribute from ButterKnife: hence, I'm using it even in Kotlin. Unfortunately, the click handler just isn't being fired when I click. Am I missing something? Is there something I have to do to integrate the…
user2836797
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2 answers

Can not inherit from final class

I have just created my first android library. At another application I want to extend a class from the it. But it shows me an error: "Cannot extend from final 'library.com.kukaintro.activities.KukaIntro'". As you can see none of the super classes…
CyberUser
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2 answers

What does the warning «Use properties from the build variant packages» mean?

What does this warning mean? It is appeared in version 1.0.0-beta-3595 for all usages of kotlin android extensions in my code.
Artyom Krivolapov
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Kotlin Gradle issue

I have created a Jar of a project written in Kotlin language. Jar contains following folders : com jet kotlin meta-inf okio org Then I created an android project and added Kotlin and the Jar as dependency. When I try to execute the hello world app…
manish
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Not able to access parent class variable in child class in kotlin

In kotlin I am trying to use parent class variables in child class but I am not able to use them ,as I am new to kotlin I don't understand how to do it simply I am trying to access sharedPerfernces and getting but its giving me null class…
Danial clarc
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Benefits of Databinding in kotlin?

I would like to know the benefits of writing extra code to implement dataBinding in Kotlin when developing Android Apps. Because Kotlin extensions already allows us to access the views directly without the need of findViewById's.
Doilio Matsinhe
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