How can I get the Token from the server Working with Postman, using the configeration as shown at the screen shoot, I’m able to get the token from the server. How can I do this using Kotlin code, planning to use it from a mobile app. 1 post - 1...

How can I get a string of mono Hello, my problem is, that I only get “MonoSubscribeOnCallable” as answer, if I am calling my api. I have tried mono.block() and mono.subscribe{} but I always get the same answer. Api: fun getPlayer(id: Number): Mono { return Mono.fromCallable { Thread.sleep(1000) "Player" + id }.subscribeOn(Schedulers.parallel()) } main: val api = Api() val mono = Mono.fromCallable { api.getPlayer(id) } mono.subscribe { println(it) } Maybe someone can...

How can I use ktor at MutiplePlatform At my project, at shared -> gradle.properties I defined Ktor version as: #ktor ktorVersion=2.0.3 And at shared -> build.gradle.kts I’m calling it as: val ktorVersion: String by project plugins { kotlin("multiplatform") id("com.android.library") } val commonMain by getting { dependencies { implementation("io.ktorktor client core$ktorVersion")...

Chain validation failed I’m having the below Okhttp code: val client = OkHttpClient() val mediaType = MediaType.parse("application/x-www-form-urlencoded") val body = RequestBody.create(mediaType, "tenant_id=xxxx&client_id=xxxx&client_secret=xxxx&resource=xxxx&grant_type=client_credentials") val request = Request.Builder() .url("https://sxxx.com/axxx/oauth2/token") .post(body) .addHeader("Content-Type", "application/x-www-form-urlencoded") .build() val response = client.newCall(request).execute() And want...

Override init in a parent class Was surprised that both parent and a child initialize overridden params, but actually got this case trying to override unused params in multiple delegate inheritance with throw. Currentl question is: how to override init block in a parent class? Currently I use a hack with is: open class A { init { if (this !is B) meth() } open fun...

recyclerView val data = ArrayList() data.add("strign") val adapter = EmployeAdapter(a) recyclerview.adapter = adapter in "a " i am getting error how to fix that error 1 post - 1 participant Read full topic

Codegen Convert Strict Native Kotlin Equivalent of JVM Kotlin I’m wondering about converting JVM Kotlin to Native Compatible Kotlin, in particular generating the equivalent code from static analysis. Are there any such tools finished/not, or what might be the complexities of such a thing? 1 post - 1 participant Read full topic

Is it possible to return a value from a canceled coroutine? I’d like to be able to define functions which perform some asynchronous actions and return some MyResult. I’d like to be able to cancel the coroutines for these functions while still having them return MyResult. Inside the functions, I can have try {...} catch(CancellationException) return MyResult(..), but how could I actually get that result returned from the catch block? Even though the CancellationException is caught and not rethrown, any variation of awaiting on the job for the...

Some kotlin.test feature requests (DisplayName, Nested, and others) Here are some features/functionality I would like to see in kotlin.test based on my experience writing Kotlin tests in JUnit 5 and starting on a Kotlin multiplatform project where only the kotlin.test subset is available. https://discuss.kotlinlang.org/#h-1-display-names-required-11. Display Names (Required) I find the @DisplayName annotation useful for classes in Java/JVM to describe what the class is testing. In Kotlin...

Best way to add kotlin-stdlib-jdk7 to a main-kts script with correct version I have a .main.kts script, and I want to use classes like kotlin.io.path.Path from the library kotlin-stdlib-jdk7. I can use this annotation: @file:DependsOn("org.jetbrains.kotlinkotlin stdlib jdk81.7.20") to bring in the dependency, but then I have to hard-code the version of Kotlin in my script. I really want to use the version of Kotlin which matches the runtime, whatever that might be. Is there some way of doing that? 1 post - 1 participant <a...

How to easily create test objects / fixtures from data classes? Hi everyone, Sometimes while writing unit tests, I need to set up a lot of test data. Typically these are going to be for Kotlin data classes (or POJOs since there are still a lot of Java dependencies). It can be tedious sometimes to set up all the test data, particularly when I’m trying to create an object that has many levels to it. Does anybody know of a good library to simplify the process of setting up test data? I’m looking for something along the lines of factory_girl or factory_bot in...

Kotlin app crashes when switching activity Hello, i have a problem with switching activitys in my app. I made a button that switches the activitys but everytime i press the button my app crashes. Android studio also gave me a few error codes. I have these in a screenshot and also the code for the activity switch. Would be great if someone could help. override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val MainActivity2 =...

Kotlin app crashes when switching activity Hello, i have a problem with switching activitys in my app. I made a button that switches the activitys but everytime i press the button my app crashes. Android studio also gave me a few error codes. I have these in a screenshot and also the code for the activity switch. Would be great if someone could help. override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val MainActivity2 =...

What do i have to put in my Manifest? Hello, i made a button that switches the activity. But everytime i press this button the app crashes. Android studio sys its because i didn’t declared smth in my manifest but idk what. Here is the error and the manifest. Would be great if someone could help me there. ![Screenshot 2022-10-22 175216|690x229]() 1 post - 1 participant...

Variable is never used I am new to learning Kotlin while reading the docs I was learning variables and I went to test it in the Kotlin playground while testing I came across this error I have searched everywhere and have not found a way to fix it the error is. Variable (BLANK) is never used. my code is fun main() { val ACTION_MOVE: Int } 1 post - 1 participant Read full topic

Higher Kinded Types A: * -&gt; * Hello It would be very useful to have higher kinded Types in Kotlin. For I have the following interfaces: interface A {} interface B : A {} In this example A, and B are first order types (*). But A and B are “higher” types (* → *) in that they need a parameter T to make a “normal” fist order type. Support for higher order types would be useful in the Following situation. I want to have a function, that maps an A to A and B to B: fun f(x: X): X This is currently not possible within the...

How to fix Unresolved reference So after using the code examples from the Android development website when i tried running it in my Code i got an error or warning saying Unresolved reference can this be ignored or is there a way to fix it My Code is fun main() { private val vc: ViewConfiguration = ViewConfiguration.get(context) private val mSlop: Int = vc.scaledTouchSlop private val mMinFlingVelocity: Int = vc.scaledMinimumFlingVelocity private val mMaxFlingVelocity: Int = vc.scaledMaximumFlingVelocity }...

How can I create my own compiler backend? Hey there! I’ve only used Kotlin for 2 weeks and I have no former experience with Java/JVM, when I’m trying to do research on this topic on my own, I stumble upon many keywords I’m not familiar with. I hope you’ll be able to help :). So I would like to create my own Kotlin backend, which would output a new, not supported by default language - my choice is Lua. While I know something about compiler design, I completely don’t know where to start in Kotlin. From what I understand, the best way...

Feature proposal: lambda flattening syntax to enable RAII and more elegant code https://discuss.kotlinlang.org/#the-problem-1The Problem In the context of multi-threaded programming, or dealing with a lot of objects with a “lifetime,” we often are forced to write code like this: lockA.read { lockB.write { ... } } use(ResourceA()) { resourceA -> use(ResourceB()) { resourceB -> use(ResourceC()) { resourceC -> ... } } } Meanwhile in C++, programmers often simplify such...

How to fix Unresolved reference So after using the code examples from the Android development website when i tried running it in my Code i got an error or warning saying Unresolved reference can this be ignored or is there a way to fix it My Code is Sorry if this is reposted i am moving this to support rather then android as it would be more appropriate. fun main() { private val vc: ViewConfiguration = ViewConfiguration.get(context) private val mSlop: Int = vc.scaledTouchSlop private val mMinFlingVelocity: Int =...

Non-gracefully cancel a heavy coroutine job in Kotlin? Hi here is a Kotlin example of my problem. I pull a value from a computationally heavy generator, it takes too long, I decide to cancel this job, but this heavy stubborn job continues to load CPU and won’t die. It would be most nicely to have a solution based on coroutines, e.g. using withTimeout or withTimeoutOrNull. If not possible then based on (multi-)threading. If above not possible then using multiprocessing...

New feature Enum valueOfOrNull It would be convenient to have a safe conversion for enumerations: inline fun valueOfOrNull(type: String): T? { return try { java.lang.Enum.valueOf(T::class.java, type) } catch (e: IllegalArgumentException) { null } } 1 post - 1 participant Read full topic

Cocoapods cinterop &amp; platform.CoreGraphics package Hello everyone, I have a problem when importing cocoapods libraries on the latest Kotlin release 1.7.20. I have a project integrating KMM for mobile platforms. Until recently integrating cocoapods via native.cocoapods plugin used to link platform.CoreGraphics lib to the generated .knm file. Thus making functions like CGSize automatically linked to the platform lib instead of building its own classes. But lately I have upgraded to the latest Kotlin features and this behaviour seems to have...

Multiple type class Trying to pass a class as 2 different types merged in a top-level parent. How to specify types correctly (not like a as B)? class Foo(foo: T) : Foo.Buz(foo = foo) { fun bar(kyle: Kyle) where T : Chad, T : Bar { kyle.foo = foo } } class Buz(val foo: Chad) class Kyle(var foo: Bar) 1 post - 1 participant Read full topic

Best way to find generic type of implemented interface? I have the following situation: interface MyInterface class MyClass : MyInterface In this simple constellation I can find out the generic type String like this: val para = myClass.javaClass.genericInterfaces[0] as ParametrizedType val genericClass = para.actualTypeArguments[0] as Class However, the solution is quite brittle, e.g. when multiple interfaces are implemented, or if MyInterface is only an indirect superinterface. Is there a better way to write this, e.g. by specifying the...

Link together multiple variables It’s more an architectural question and currently it solves by observables or setters or something else. But what is the current best way to provide consistency of 2 (or more) variables: if one changes value, the second should be changed too? E.g. how to make it more optimized or simple? class Human { var house: House? = null } class city { val humans = listOf() val houses = listOf() fun demolish(house: House) { humans.forEach { human -> if (human.house...

ScriptEngine#get doesn't work like other script engines I’m trying to add support for Kotlin to the Apache NiFi scripting bundle and ran into some weird behavior in Kotlin’s JSR223 engine. A lot of our scriptable processors and services assume that you can fetch objects from the processed script and invoke them using the java scripting components as shown in the screenshot below. <a class="lightbox" href=""...

Need Assistance in find Min And Max from user input Array in Kotlin On the Android Studio emulator The user is required to enter a maximum of 10 numbers. When I put in the number 1 the output shows 0 instead of 1 (this is for the min number; the max works perfectly fine). Below is a snippet of my source code val arrX = Array(10) { 0 } . . . . findMinAndMaxButton.setOnClickListener { fun getMin(arrX: Array): Int { var min = Int.MAX_VALUE for (i in arrX) { min = min.coerceAtMost(i) }...

Is there any chance that Gradle will get replaced by something in the future? My least favorite feature about Kotlin is the fact that its tied so much with Gradle. I hate Gradle with passion. Just seeing Gradle files in my project makes me sick to my stomach. I think about switching to other language just for that reason. Why Intellij does not allow me to make Kotlin project with its build system ( like it does for Java )? Is there at least 1% of chance that Kotlin will get its own built-in build/package system? 1 post - 1 participant <a...

Is there a way to get from KProperty0 to KProperty1? I cannot find a way to get from an instance-bound property to the respective class property, e.g. from ::myVal to MyClass::myVal. I feel, that this should be possible since ::myVal is just a specialized case of MyClass::myVal. Do I miss something? 1 post - 1 participant Read full topic