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hello lovely people:) I would like to extend static method of Java (Android) Color class, something like:

fun Color.parseNullableColor(colorString: String?): Int? {
    val colorString = colorString ?: return null
    try {
        return Color.parseColor(colorString)
    } catch (e: IllegalArgumentException) {
        return null
    }
}

Seems it’s not possible? https://stackoverflow.com/questions/28210188/static-extension-methods-in-kotlin Thanks!

I think I found a bug in kotlin 1.5.20, but I can't get a simple repro case. I have a

if

that's being skipped, even though it evluates to

true

in the debugger. I think it has to do w/ nullable types. There is a if statement above the one being skipped that under certin conditions will assign a instance to a nullable type. Then the second if statement checks some other conditions on that nullable type... but it looks like the compiler is just skipping the entire evluation of the second

if

In addition to

mutableList.add(0,element),

are there any other APIs to insert an element to the head of a

mutablelist

?

mutableList.add(0,element)

is ok, but not as expressive. 🤔

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Hi everyone. How can we access the fileName of our main function in Kotlin? for example, suppose we have a file Example.kt that has a main function in it declared outside any class. I want to access the fileName and the package that Example.kt is in. Thanks for your help.

Is Swing the only remaining way to build truly cross-platform Desktop UIs (without building OS-specific distributables)?

I have a dependency which has no nullable annotation. Can I add these annotations externally in my project? I expect something similar to

.d.ts

.

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hi everyone, thanks for the invitation! I was wondering what is the best place to find jobs here?

Any pointers on how to bulk fix

Suspend function '..' should be called only from a coroutine or another suspend function

using IntellIJ? I can’t find any corresponding inspection in Code Cleanup, though I swear I automated this before…

HI Everyone...Can I ask Questions here??

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Can anyone suggest the best way to get the current data class’ package name in the constructor as a default value?

Hey guys! Are there any Mapper Frameworks (like MapStruct) that works very well with Kotlin? Any suggestions?

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can anyone advise if something fundamental changed with how

equals()

works or how

kotlin.test.Assertions

might handle

RuntimeExceptions

between Kotlin v1.3.62 and v1.5.20? I have a unit test that is more than a year old which started failing when I updated the version of Kotlin. details: I have a custom exception class, MyException:

internal class MyException(cause: Throwable) : RuntimeException(cause)

I then have some code which simply catches any errors and logs:

} catch (e: Exception) {
        myLogger.logException(MyException(e))
    }

Now inside the unit test, we want to confirm that we’re catching exceptions, transforming them to our type, and logging. So the exception is thrown and then log is checked as such:

val exception = RuntimeException("some failure!")
...
...
loggedExceptions.latest() shouldBeInstanceOf MyException::class
(loggedExceptions.latest() as MyException).cause shouldBeEqualTo exception

that final line now fails with the following:

java.lang.AssertionError: Expected <java.lang.RuntimeException: some failure!>, actual <java.lang.RuntimeException: some failure!>.

to reiterate, nothing about this unit test (or the class which it is testing) has changed in over a year. I can’t explain what could be happening here? would greatly appreciate it if someone could shine any light on this. see attached the version diff:

where am I supposed to pass specific kotlin compiler arguments, such as

-Xadd-modules=

, if running via Idea?

Adding Volume to the Kotlin Identity Kotlin isn’t just a programming language, and it’s not just a language for Android development. It’s a whole ecosystem for creating various projects, from mobile apps and websites to data science. It’s an active, friendly community, with hundreds of online and offline events happening all around the world. Despite its fairly long history, Kotlin has […]

Maybe it is time to update the logo of this Slack workspace :kotlin: (+ the emoji) to the new one :kotlinnew:?

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Hello All, I'm having trouble converting the following java code into kotlin. Can I get your input? The Java code:

if (hiddenView.getVisibility() == View.VISIBLE) {
     TransitionManager.beginDelayedTransition(cardView, new AutoTransition());
     hiddenView.setVisibility(View.GONE);
                   
}

My code:

if (hiddenView.isVisible) {
     TransitionManager.beginDelayedTransition(cardView, AutoTransition())
     hiddenView.visibility = it.GONE
}

Is it possible to get and set audio volume controls with kotlin for mac, windows and/or linux. I've seen a couple of open source project but don't really understand how they work. The goal is to make an application to remotely fine control my pc(windows) en laptop(mac book) volume, this will be linked to my phone(android) and Ipad(ios). The lateral isn't the big issue but the volume control on the os is. Let me know some suggestions or projects to check out, any help would be welcome. Preferably in Kotlin 😉:kotlin-intensifies:

A quick questions on generics. Is it possible to enforce non-nullable type from a nullable type? Something like this:

class Foo<T: Any?> {
  
    abstract fun returnValue(): T
    abstract fun returnValueAsNonNullable(): T!! // this doesn't work 

}

The problem is I need to define the T type as either nullable or non-nullable, but I'm trying to bridge semantics of reactive streams, which are always non-nullable and represent

null

by empty stream state, and futures which are possibly nullable. However I need to differentiate between a nullable and non-nullable future, therefore decide whether to allow the reactive stream to return empty value (as null) or fail.

Hey, I’m trying to call https://github.com/jesperfj/force-rest-api/blob/b1f6330d49211f639b903225926d081fcece487e/src/main/java/com/force/api/ResourceRepresentation.java#L36-L38 from kotlin but I get the error

expecting an element
val res = api.getSObject("Account", "0015000000VALDtAAP").as(Account::class)
                                                          ^

It seems there is an internal kotlin function/keyword 

as

 that prevents me from calling that function on my class. For instance the class String  can get the same error

>>> val x = "10"
>>> x.f1("ola")
error: unresolved reference: f1
x.f1("ola")
  ^
>>> x.as("ola")
error: expecting an element
x.as("ola")
  ^

I should get the same error but nope, any idea what’s going on ?

Hello, I am trying to migrate to kotlin 1.5 and use the new value class but I cant find the

@JvmInline

annotation. Do i need to add a certain dependency?

is there anyway to annotate a method such that there is a warning if it is called from kotlin code, but nothing happens if it is called from java? There are several edge cases where I want to expose a different API to java consumers for the legacy portion of my code base, but I don’t want to encourage the usage of it from the newer kotlin code

Hi, Have question related to Generics.

interface DataProvider<T> {
    fun provideData(t:T): Data
}

class TaxDataProvider: DataProvider<Tax> {
    override fun provideData(t: Tax): Data {
        return Data()
    }
}

class Provider {
    fun register(dataProvider: DataProvider<*>) {
        dataProvider.provideData(Tax())  //Not able to call this. Getting error: Type mismatch Required Nothing. Found Tax
    }
}

Is there any way to achieve this? I wanted to keep register method to accept type of DataProvider not specific type (TaxDataProvider).

Hi, are there any existing solutions to auto-generate a Kotlin data class from Java class parameter (like

Pojo.class

) or any other way?