After migrating to AndroidX I found that in some, not all of my classes the kotlinx.android.synthetic fields are now failing to convert to the actual class. Widget has an unresolved type 'androi...

I have this set of data classes, all in the same file: @Parcelize data class Response(val RecordView: RecordView):Parcelable @Parcelize data class RecordView(val Records: List<Records>):Par...

I have this extension: src/main/kotlin/com/myproject/api/extensions.kt fun String.asJson() : JsonObject { return JsonObject.readFrom(this) } When I run my application, it works fine. But, when...

I want to create an extension function of String which takes a String and returns a new String with the characters as the first, but sorted in ascending order. How can I do this? I am new to Kotlin...

How to call extension function of the base class in a derived class using the super keyword? I tried to call using super but it doesn't work. open class abc { open fun aa() { println("functio...

I would like to restrict on which constant value extension function can be called. For example function like: @IdRes fun <T : View> Int.find() = findViewById<T>(this) If this was cal...

The Code for my Parcelable Model class is below, @Parcelize data class Client( @SerializedName("id") var id: Int = 0, @SerializedName("accountNo") var accountNo: String? = null, @Serialize...

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' t...

I have to make a library(aar) in Kotlin and have to use that in Android application made using Java. Kotlin library has a class with companion functions to use statically in Java application. When ...

I've just looked at Kotlin standard library and found some strange extension-functions called componentN where N is index from 1 to 5. There are functions for all types of primitives. For example...

I want to access a TextView which is included inside headerLayout of NavigationView. Is it possible to access the view using Kotlin android extension? I did using this method, but the TextView (her...

I have an object QuickSort that I am attempting to create 2 instances of. When I try to create 2 separate instances I can see that it is only using one instance because I have a count in the QuickS...

I've defined a class like so abstract class MvpViewHolder<P>(itemView: View) : RecyclerView.ViewHolder(itemView) where P : BasePresenter<out Any?, out Any?> { protected var presenter...

I know inline keyword means to avoid the call overhead calling a funtion. But I can't figure out what inline a extension property work for? Let say we have two extension property named foo and ano...

So if extension methods and extension properties are really static methods and properties. And static methods and properties and methods are not thread safe and therefore should be avoided then ext...

As with anko you can write callback functions like this: alert { title = "" message = "" yesButton { toast("Yes") } noButton { toast("No") } } How can I create a nested functions like...

I have an existing Android Project that uses the following libs: AutoValue Dagger2 RxJava Retrolambda I am trying to add Kotlin Support so that I can slowly migrate the project over to Kotlin. ...

Is it possible to create extension of final classes like String? Like in swift it is possible to add additional methods inside a extension of final class. For an example - I would like to create a...

I'm thinking about adding a global extension method to String in just one file,and wherever i use a String i can always use this extension. But i failed to find a way to do so...i just paste the e...

strings.xml <string name="my_string">Showing your number: %1$s</string> ActivityExt.kt fun Activity.showToast(textResId: Int, vararg formatArgs: String) { val text = getString(text...

Is it possible to define a Kotlin extension function on a annotated type like this? @ColorInt fun @ColorInt Int.darken(): Int { return ColorUtils.blendARGB(this, Color.BLACK, 0.2f) } Alternativ...

Let's say I have a few extension methods for "MyClass". My question is, what's the best practice to organize/store these methods? Should they be simply put into a "MyClassExtensions" Kotlin file? ...

I have a layout with some views, one of them has the id title_whalemare import kotlinx.android.synthetic.main.controller_settings.* import kotlinx.android.synthetic.main.view_double_text.* class ...

If I have a jar, on the classpath, where I've created an extension function on say the String class for argument's sake and I have another jar with the same extension function on String, how will K...

Kotlin extension function is great. But how could I perform unit test on them? Especially those that is of Android SDK provided class (e.g. Context, Dialog). I provide two examples below, and if a...