How to call free function inside use block @harrypotter wrote: I am using use block to cleanup JDBC Statements properly. But inside, I get syntax error trying to call a free function. Is there a syntax to do this? Posts: 1 Participants: 1 Read full topic

Companion Object inheriting Abstract Class? @togrias wrote: Say I have this: class A { companion object: AbstractObject(A) } There’s no error during typechecking but an error during compiling: kotlin java.lang.illegalargumentexception: parameter specified as non-null is null Posts: 1 Participants: 1 Read full topic

Cannot add an element to a collection with += if it's declared as var @reitzig.1 wrote: Consider this completely innocent piece of code: var set = mutableSetOf() set += "abd" I get a compiler error: Error: Kotlin: Assignment operators ambiguity: public operator fun Set.plus(element: String): Set defined in kotlin.collections @InlineOnly public inline operator fun MutableCollection.plusAssign(element: String): Unit defined in kotlin.collections This seems silly; how can +...

Kotlin access protected static nested java class @leokraemer wrote: I come with a question from Stackoverflow, that spiked my interest and I could not answer to my satisfaction. Suppose A.java: public class A { public void overrideMe(B param){ //TODO: override me...

Seems property annotations in data class performs different~ @abelli wrote: I wanna add annotations to some properties (specially on those of Date type) in a data class. But the annotations are ignored after compilation. Here’s some snippets: source of data classes: data class PipeParam( var firmId: String? = null, @JsonSerialize(using = JsonDateSerializer::class) @JsonDeserialize(using = JsonDateDeserializer::class) @JSONField(serializeUsing = DateCodec::class,...

What is your favorite mocking framework for Kotlin? @medium wrote: What is your favorite mocking framework for Kotlin and why? Posts: 1 Participants: 1 Read full topic

Copy File from res @jmg12 wrote: hi, i can now copy files from external storage to external storage, i wonder how to copy one file in the app/main/res folder to external storage … i’ve tried many thing like : var inStream: InputStream? = null var outStream: OutputStream? = null val bfile = File(Environment.getExternalStorageDirectory().toString() + "/Rivescript/Bots/Bfile.txt") val afile =...

Compiling with konan behind proxy @forpdfsending wrote: Hello. How to specify proxy settings for konan? I tried to start it with konanc hello.kt -Dhttp.proxyHost=10.0.0.100 -Dhttp.proxyPort=8800 and also tried to specify system variable at Windows set JAVA_FLAGS=-Dhttp.proxyHost=10.0.0.100 -Dhttp.proxyPort=8800 but it fails on Download native dependencies… Thank you! Posts: 1 Participants: 1...

Two gifs show why should we use Kotlin @ice1000 wrote: Posts: 1 Participants: 1 Read full topic

Allopen IDEA plugin @dazzbourgh wrote: Is there an allopen plugin for IDEA? I’ve found one for maven, but IDEA shows an error on configuration classes not marked as open, so I guess I need another plugin for IDEA itself, but I can’t find it Posts: 1 Participants: 1 Read full topic

Tabbed fragement access data other fragment @pejan wrote: Hello, I am trying to ‘reuse’ a recyclerview. I have a tabbed fragment (contacts) with a list of contact (contactsList). On another tab I have a fragment called group with a FAB that activates a new activity (addGroup). On that addGroup activity I have copied (included) the same Recyclerview as on the contactsfragment. I’d like to multi select a couple of contacts there. I am able to set the...

Expression parsing ambiguity @daemontus wrote: Hi! Recently I ran into a bit of behaviour which I find rather odd, because it feels like it could be a source of very hard to track bugs. However, I’m not sure whether this is intentional, or a bug, hence I want to ask here first, before submitting a bug report. Compare these three assignments: val b = true && false val p = 3 + 4 val t = 3 * 4 The...

Kotlin Plugin 1.2.30 Error @kcappieg wrote: I’m very new to Kotlin, and I’m having a hell of a time getting the latest plugin 1.2.30-release-IJ2017.3-1 to work correctly in IntelliJ Communitiy edition. The plugin immediately throws an error. First few lines of the stack trace in the error details: null java.lang.AbstractMethodError at...

Exceptions auto wrapping @dobriy_eeh wrote: This topic is idea for a new language feature: wrap throwing exceptions automatically. Syntax example: fun ProfileService.renameProfile(profileId: Int, newName: String) throws ProfileException("profileId: $profileId, newName: $newName") { // код реализации } This means: if function code throws some exception, it would be automatically catched and wrapped with...

Kotlin 1.3 @user1 wrote: Is there any public roadmap for Kotlin 1.3? I’m particularly interested in collection literals. Posts: 1 Participants: 1 Read full topic

Master Detail @hanGtz wrote: Hello Friends, I AM a new Kotlin developer, AM discovering this language, everything seems to be fine, but there is a thing a could not find i all the web yet, how to do a Master detail. I mean for example doing an invoice, a classic one, I need to especify date, hour, user, number and so on but in the same Activity save the datails such as product, price, quantity, and so on. That is my question...

Code highlighting: wrong fun arg style @CeH9 wrote: Argument init has keyword-like style. <a class="lightbox" href="https://discourse-cdn-sjc1.com/business/uploads/kotlinlang/original/2X/5/5d2409255e0516624a5c5cb85d79ce24667d983f.PNG" data-download-href="https://discourse-cdn-sjc1.com/business/uploads/kotlinlang/5d2409255e0516624a5c5cb85d79ce24667d983f" title="kotlin_args.PNG" rel="nofollow noopener"> kotlin_args.PNG750x434 14 KB </a> <a...

Ho do you extend java methods with primitive types (as parameter or return type)? @3drmnb wrote: Hello all, my problem is that I am having a lot of java classes (due to swig) which only have the SomeType1 get(int index); long size(); member methods. Lets call this java ArrayClass1 In order to be able to do simple for(item in ) I need to override the iterator() operator. Implementing ArrayClass1Iterator(val array: ArrayClass1, var currentIndex: Int = 0): Iterator { override fun hasNext():...

LinkedList in kotlin-stdlib-common @Andi wrote: There seems to be no LinkedList or Queue collection in the kotlin-stdlib-common, so there is no way to use it in a multiplatform project. Will it be added in the near future? Posts: 1 Participants: 1 Read full topic

When property access @LukeWaggoner wrote: I find myself wishing that when supported the following on a very regular basis: when (myString){ .isNotEmpty() -> { } .length > 30 -> { } } or when (myDoor){ .isOpen -> { } .isClosed -> { } .isWooden -> { } } Have there been any other requests for this kind of syntax? It doesn’t seem messy to me, and seems more concise than an...

Kotlin interop with C++ @agiro wrote: I plan to mess around with a game engine project, for whom I use opengl with C++, as well as Bullet Physics, which is also written in C++. Note I’m not doing any libgdx (because I found its workflow terrible), and the java version of Bullet is pretty much abandoned. However, I’d like to use Kotlin as a scripting API. Can I do that? If so, how? And - given I use opengles - can I compile that to...

Affine matrix transformation @danielmcquillen wrote: Just getting into Kotlin so apologies if I’m missing something elementary. I want to use the javafx.scene.transform.Affine matrix to do some transformations. However, if I create a var matrix = Affine() and append a simple rotation transformation, when I try to transform a com.sun.javafx.geom.Point2D object, like matrix.transform(Point2D(0.0f, 0.0f)), the IntelliJ compiler flags...

Single Instance Enums (Enum Object) @icecubez wrote: It’s mostly a QOL suggestion, but there have been times where I only needed a single instance of a enum class. I propose enum object as a single instanced enum class. Posts: 1 Participants: 1 Read full topic

Default Types for Generics @Fleshgrinder wrote: I could not find an existing topic regarding this issue but maybe my keywords were simply not the right ones to search for. Regardless, here it comes. I would love to see default types for generics in Kotlin like Rust has it: github.com <a...

Kotlin NPE with ArrayList&lt;Byte&gt;.toByteArray() @petersamokhin wrote: Hello. I have got one strange exception: 03-21 123903.308 30540-30654/com.package.android.app E/LoadTask: Unexpected exception loading stream java.lang.NullPointerException: Attempt to invoke virtual method 'byte java.lang.Number.byteValue()' on a null object reference at kotlin.collections.CollectionsKt___CollectionsKt.toByteArray(_Collections.kt:904) at...

Default for throw or null @rjhdby wrote: Just for think about Syntax sugar for constructions like try { someWork() ?: someDefaultWork() } catch (e: Exception) { someDefaultWork() } Maybe someWork(key) ?!: someDefaultWork() Just for think about Posts: 1 Participants: 1 Read full topic

Finding BLE Characteristics After Services are Found Not Working @addzo wrote: I am new to Kotlin and Android. I need to write an app that finds a particular peripheral, connects to it and writes to a characteristic. I can find it, and I am connecting to it and finding services. However, I can not seem to discover an characteristics at all. Code: override fun onServicesDiscovered(gatt: BluetoothGatt, status: Int) { super.onServicesDiscovered(gatt, status)...

Unsolved Reference? @vladtaylor123 wrote: etShowNumbers and isNewOp are unsolved references, although I’ve seen many tutorials and they use it normally, even a fully complied application is working with these codes, and when I type it down in Android Studio, it doesn’t work, any reason why? Posts: 1 Participants: 1 <a...

Pleas help me i have problem in my project @dbfdbhj wrote: <a class="lightbox" href="https://discourse-cdn-sjc1.com/business/uploads/kotlinlang/original/2X/9/9051e389b69f7458e78ae00ab32454f2f797d97b.png" data-download-href="https://discourse-cdn-sjc1.com/business/uploads/kotlinlang/9051e389b69f7458e78ae00ab32454f2f797d97b" title="1254.png" rel="nofollow noopener"> 1254.png1366x768 208 KB </a> hello friends at my project i get this problem what is...

Filter a list by type @jerem44 wrote: Hi, Is it possible in kotlin to filter element of list by these type. My list contain element which are generic IEventSubsriber where IDomainEvent is en interface: This is the model : interface IDomainEvent data class WarriorCreated(val content: String): IDomainEvent data class WarriorDeleted(val content: String = ""): IDomainEvent I thied with the methode of List : filterIsInstance() but with...