How to check method in when in kotlin I wrote the code below. fun check(list){ list.forEach{ when(it){ is Int -> something() is String -> something() //is method -> ??? else -> consume{it} }}} inline fun consume(f: () -> Unit){ f() } But I don't want to check the method in else. Is there any way to check the method in when?

Import dependency libraries in kotlinc terminal I am playing with kotlinc in mac terminal, however I would like to use libraries like rest client inside kotlinc. Is there a way to include? Like import in python

Which method is used in Kotlin's Double.toInt(), rounding or truncation? On the official API doc, it says: Returns the value of this number as an Int, which may involve rounding or truncation. I want truncation, but not sure. Can anyone explain the exact meaning of may involve rounding or truncation? p.s.: In my unit test, (1.7).toInt() was 1, which might involve truncation.

Could not get unknown property 'anko_version' for object of type...? I am trying to use Anko with my Android Kotlin Project. I have added the line to my dependencies / gradle module file as follows: dependencies { compile fileTree(include: ['*.jar'], dir: 'libs') androidTestCompile('com.android.support.test.espressoespresso core2.2.2', { exclude group: 'com.android.support', module: 'support-annotations' }) compile "org.jetbrains.kotlinkotlin stdlib jre7$kotlin_version" compile "org.jetbrains.ankoanko$anko_version"...

What feautures, libraries, etc. would you recommend to any Kotlin Android Devoloper [on hold] I recently started working with Android and decided to go with Kotlin as my language of preference. I know about Anko, MaterialDrawerKt and features such as Sythetics, Getters, Setters. What other libraries and features would you recommend to me and any fellow kotlin Android devolopers.

Kotlin coroutine doesn't wait to be done I have a legacy project where I want to use coroutines when contacting the backend. The backend have been handle by a sdk delivered by Hybris. It use volley for instance, and with some callbacks. What I want is to wrap those callbacks with a coroutine. But the problem I have is that the coroutine doesn't wait to be done, it start the coroutine, and keep going to next lines, and method returns a value, and long after that the coroutine finish. My code: suspend fun ServiceHelper.getList():...

generics compilation error in kotlin There is a function. It is shown below. fun constructCollectionType(collectionClass: Class, elementClass: Class): JavaType { return mapper.typeFactory.constructCollectionType(collectionClass, elementClass) } I call the function above in other function. The code is shown below. val type = constructCollectionType(MutableList::class, Sku::class.java) Then, kotlin compile give me an error. Only classes are allowed on the left hand side of a class literal. How can I fix the error ?

Parsing json into Java Pojos with Gson from Kotlin is missing generic information I'm having an issue with Java types and Gson, when being called from Kotlin The Java POJO's representing an API response and it's errors public class ApiResponse { @SerializedName("errors") public List errors; } public class ApiResponseError { @SerializedName("code") public Integer code; @SerializedName("message") public String message; } The http response body on the wire { "errors": [ { "code": 10002, "message": "Not found", } ] } The kotlin...

Cannot pass Context when building a GridView in Kotlin I'm looking for some help creating a GridView in Kotlin. Please do not show me JAVA code as I have tried adapting various JAVA examples already. So, I created the extension to BaseAdapter, but I cannot get to pass the context. The Android documentation shows how it accesses by calling gridview.setAdapter(new ImageAdapter(this));. Assigning the BaseAdapter to a GridView element...

Smart cast to 'Boolean' is impossible after value affectation Error on the second println : Smart cast to 'Boolean' is impossible, because 'r.isSquare' is a mutable property that could have been changed by this time fun main(args: Array) { val r: Rectangle = Rectangle(5,5) println(r.isSquare) r.isSquare = true println(r.isSquare) // error but works with println(r.isSquare?:false) } data class Rectangle(var height: Int, var width: Int){ var isSquare: Boolean? = null } If it was null, it would print null like the first...

I want to show DialogFragment in Kotlin I want to show DialogFragment when button is clicked but I have error in my code the error is in fun " show " this my code " button on click " DialogFragment val pop = alarm_first() val fm = FragmentManager pop.show( fm , "name") and this my fragment class for "alarm_first" : class alarm_first : DialogFragment() { override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?, savedInstanceState: Bundle?): View { var myView =...

IntelliJ IDEA using JavaScript "version" of dependency specified in Gradle build file? This issue just recently (past couple days) started occurring on one of my development machines. I'm using Eclipse's Vert.x dependency for a web project: build.gradle dependencies { ... // Kotlin compile "org.jetbrains.kotlinkotlin stdlib jre8$kotlin_version" // Vert.x for web framework compile group: 'io.vertx', name: 'vertx-core', version: '3.4.2' compile group: 'io.vertx', name: 'vertx-web', version: '3.4.2' ... } This has worked fine in the past - I...

Keep BaseActivity in Java compatible with Kotlin Activity I would like to know if there is a way to maintain a BaseActivity (Java) that has, for example, functional BottomNavigationView for Java and Kotlin Activities. In the future I intend to turn the (several) Java Activities into Kotlin, since the new Activities are developed in Kotlin. The problem is that Java is able to keep BottomNavigationView created correctly since Kotlin plays as null and BottomNavigationView loading comes after the loop maintained as in Java. Another attempt was to try to...

How to create a new list from anther in kotlin? In java we can create a new list from another like this: List list1 = new ArrayList(); list1.add(1) list1.add(-10) list1.add(12) list1.add(37) List list2 = new ArrayList(list1); how can we achieve the same result as above in kotlin using listOf() or mutableListOf()? Thanks

How to initialise view in fragment class in kotlin? i want equivalent code in kotlin for TextView tv = view.findViewbyId(R.id.textView); how to do this kotlin

Jackson ready only collections I have Spring Boot project with a post endpoint for a entity like this: class Task{ @JoinTable(name = "task_user", joinColumns = arrayOf(JoinColumn(name = "task_id")), inverseJoinColumns = arrayOf(JoinColumn(name = "user_id"))) @ManyToMany var users: MutableSet = HashSet() } I don't want people to be able to post users with the task, but @JsonProperty(access = READ_ONLY) doesn't seem to work on collections, so if I supply id's which exist, they are attached to the task...

How do I declare a function parameter to accept functions that throw? I have defined a function in Kotlin: fun convertExceptionToEmpty(requestFunc: () -> List): Stream { try { return requestFunc().stream() } catch (th: Throwable) { // Log the exception... return Stream.empty() } } I have defined a Java method with this signature: List getStaticWidgets() throws IOException; I attempt to compose them like so: Stream widgets = convertExceptionToEmpty(() -> getStaticWidgets()) When I compile I get this error:...

Android WebView jumps to the top on each page update(?) I am implementing standard Web View activity with javascript enabled and I came across unwanted behaviour that makes it impossible to interact with (one, for now) webpage. class WebViewActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_fullscreen) supportActionBar?.setDisplayHomeAsUpEnabled(true) web_view.webChromeClient = WebChromeClient() web_view.webViewClient =...

access to the android.os.storage.StorageVolume Can't get an access to the android.os.storage.StorageVolume in a Kotlin project. I've already checked sdk folder - the file is there and I can access it in other projects. What can be the reason? I can import only StorageManager and OnObbStateChangeListener from that package. Maybe because of Kotlin? Any idea? P.S. I've tried to restart/rechached, rebuild, and clean the project up, of course

Change clans fab menu orientation programmatically I am using clans fab library to create a menu with a set of buttons. My menu fab as an open direction set to "up", and this works pretty fine if the phone is in portait mode. However if I turn it to landscape mode, half the buttons get cropped. I was wondering if I could change the fab menu open orientation programmatically on my onConfigurationChanged method. Something like this: override fun...

Pass array of non-nullable strings as array of nullable strings I have a function that takes in an Array: fun doStuff(words: Array) { // ... } Is there a way I can pass in a Array to this function? As-is the compiler is giving me a "type mismatch" error. private val SOME_WORDS = arrayOf("I", "want", "to", "use", "these") doStuff(SOME_WORDS) // throws a type-mismatch error Preferably I'd like to avoid making SOME_WORDS an arrayOf(...) if possible.

How to implement Memento Pattern in Kotlin I am currently trying to implement some design patterns in Kotlin as an exercise and I'm a bit stuck with the 'Memento' pattern. My reference resource is SourceMaking: Memento. I want to implement this structure: While following their "Checklist" Identify the roles of “caretaker” and “originator”. Create a Memento...

AWS S3 unresolved supertype: TransferListener in top level class Kotlin I just updated Android Studio to 3.0-beta2 and all the build tools along with it. I'm running into an odd compilation error, I have a MediaUploader class which implements the TransferListener interface (this use to compile). When I use: class MediaUploader: TransferListener { ... } I get this error: e: Supertypes of the following classes cannot be resolved. Please make sure you have the required dependencies in the classpath: class com.example.sdk.utils.MediaUploader, unresolved...

Anonymous extension function literals in Kotlin Following this blog post from some years ago, I couldn't quite get the anonymous extension function literals to work and wonder whether they were deprecated from the language. It appears I can have either anonymity or extension but not both. Here are the things I tried: Without extension functions, I can write an anonymous function literal and call it in the same line: {...

anko doAsync onComplete I know there are two methods available to do AsyncTask in Anko library. doAsync() doAsyncResult() My question is both the above methods have onComplete() method. In both method's onComplete() there is no trace of result like AsyncTask.onPostExecute(). Example: doAsync { sdkServiceFactory.initSDKService() onComplete { Log.d("Controller", "Sdk Connected") } } val result = doAsyncResult { onComplete { Log.d("Controller", "Sdk...

Data classes in interface In Kotlin I can write like this: interface KeyMapperService { interface Add { data class Success(val key: String, val link: String): Add data class AlreadyExist(val key: String): Add } interface Get { data class Link(val link: String): Get data class NotFound(val key: String): Get } fun add(key: String, link: String): Add fun getLink(key: String): Get } How will this code look like in Java? I can not understand.

TornadoFX: Allow copying an item from a listview to clipboard When an item in a listview is selected, I would like the user to be able to copy the content to the clipboard. How can I achieve that?

Play Sounds From Raw File in Kotlin I create Application Sounds Of Animals But I have a Problem The Sounds are not playing The Code of list of Animals with Name , Image and Sound listanimales.add(animals("Cat",R.drawable.a1,R.raw.a1)) listanimales.add(animals("Dog",R.drawable.a2,R.raw.a2)) listanimales.add(animals("Fox",R.drawable.a3,R.raw.a3)) override fun getView(postion: Int, p1: View?, p2: ViewGroup?): View? { var anum = mylistofAnimals[postion] var myView = layoutInflater.inflate(R.layout.design,null)...

"Property type is not a subtype of overridden abstract val" on multiple-inherited field Sometimes, a type is declared to implement 2 interfaces which both have an abstract property the same name, but when I moved the bounded type argument to a top-level abstract superclass and subclass it in different objects, the class overriding the the abstract property on both superinterfaces fails to compile when using type arguments for a subclass. The generated interfaces and abstract class: interface Actor : Type { val login: Stub val posts: Config } interface SomeConflict : Type...

Kotlin reflect proguard SmallSortedMap Warning: kotlin.reflect.jvm.internal.KClassImpl: can't find referenced class kotlin.reflect.jvm.internal.KClassImpl$kotlin.reflect.jvm.internal.KClassImpl$Data Warning: kotlin.reflect.jvm.internal.KClassImpl: can't find referenced class kotlin.reflect.jvm.internal.KClassImpl$kotlin.reflect.jvm.internal.KClassImpl$Data Warning: kotlin.reflect.jvm.internal.KClassImpl$data$1: can't find referenced class kotlin.reflect.jvm.internal.KClassImpl$kotlin.reflect.jvm.internal.KClassImpl$Data Warning:...