Apply @JvmStatic and @JvmField automatically to all files in Kotlin I was wondering if this could be somehow done using compiler parameters or a plugin. I have existing java module that I converted to kotlin, but it has a bunch of static methods/fields. At some point I wanna refactor that, but now my (java) consumer of this library doesn't work unless I manually add missing @JvmStatic/@JvmField annotations to companion object fields and methods. Is there any way to do this automatically? Thanks

variable value gets null in retrofit I have a fragment which has an adapter. I am using retrofit to fetch data from web my frangment class MyTransactionFragment : Fragment() { val disposable = CompositeDisposable() var transactionDetailList:ArrayList? = null private var mApiSocket: ApiSocket? = null private var mRecyclerView:RecyclerView? = null var adapter:TransactionAdapter? = null companion object { val TAG = ItemFragment::class.java.simpleName!! fun newInstance(transactionPojo:...

GSON throwing Expected BEGIN_OBJECT but was BEGIN_ARRAY Facing this problem past few days.Does any guys check this issue? Any help would be greatly appreciated.How can I solved this problem? GSON throwing Expected BEGIN_OBJECT but was BEGIN_ARRAY Problem coming from override fun onSuccess(str_SUCCESS: String) { System.out.println("JSON_IS"+str_SUCCESS) val paymentScheduleModel = Gson().fromJson(str_SUCCESS, PaymentScheduleModel::class.java) // Problem here } Json Response is { "status": { "statusCode":...

Declaring same property in Child class as in Parent I have stared Kotlin recently and have experience in Java. In Java, we can declare the field with same name as it is in parent. When I do same in Kotlin it gives error name hides member of Super type User. What am I missing here? Kotlin open class User(protected var name: String) class TwitterUser(var name: String) : User(name) Same concept for Java public class A { protected String name; } public class B extends A { String name; }

Various questions @NonNull, @NotNull and @ParametersAreNonnullByDefault I'm an Android dev who is using AndroidStudio or IntelliJ IDEA. I tend to trust my IDE and I'm annoyed with next facts: In android project when I implement a method in java that extends Kotlin class then both IDE uses @NotNull instead of @NonNull, is there setting for this? We have @ParametersAreNonnullByDefault but when I override the method from the point 1 and I don't put any annotation IDE warns me, but why? Am I wrong in my assumptions? Are there solutions?

Kotlin cast exception for visitor pattern with generic return type I'm trying to use something like the visitor pattern, but with return values. However, although there are no explicit casts, I'm getting a ClassCastException: Exception in thread "main" java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to [Ljava.lang.CharSequence; at Printer.combine(...) at Split.accept(...) at MWEKt.main(...) Code: interface TreeElem { fun accept(visitor: TreeVisitor): T } class...

How coroutines implemented in JVM langs without JVM support? This question came up after reading Loom proposal, which describes approach of implementing coroutines in Java programming language. Particularly this proposal says that to implement this feature in the language the additional JVM support will be required. As I understand there are already several languages in JVM that have coroutines as part of their feature set such as Kotlin and Scala....

Why doesn't Kotlin use `List(...)` as a factory for lists and a similar convention for all abstract collections? In Scala, there is a convenient convention of providing collection factory methods through companion objects, using the companion object's apply method. So, if I want to create a list with the elements 1, 2, and 3, I just use List(1, 2, 3). The pattern is consistent across all collection types. In Kotlin, if I write List(1, 2, 3) I get a compilation error. To create a list with 1, 2, and 3, one has to use listOf(1, 2, 3). List is an interface, so it has no constructor, obviously. There...

How to log in presenter classes in Kotlin? I enabled logging with Anko in activities by implementing AnkoLogger interface. Now I want to enable logging in presenter classes. What should I do?

Kotlin superClass Kclass I have definiction of the function abstract class AbstractDao(private val dataStore: KotlinEntityDataStore): Dao where T: Persistable and I need to get Kclass from type T. It is possible in Kotlin ?

Use Active Android in Kotlin Project I try to use Active Android (ORM DataBase) in My Kotlin Project But when I save the EditText input , my program always crashes! All program codes are available in Gitlab.com and are open source , I also ask people who have the ability to modify my project to apply it to the git , I love you very much :-* My Kotlin Class : MainActivity.kt AppController.kt ModelRequest.kt MainActivity.kt...

MyObjectBox is not generated in kotlin (objectbox library) I am trying to use Object Library. I read the official documentation and follow the instructions. But still, it not working. The problem is when I try to initialize boxStore object I don't find MyObjectBox class. val boxStore = MyObjectBox.builder().androidContext(this).build() Here is my app module. build.gradle (app module) apply plugin: 'com.android.application' apply plugin: 'kotlin-android' apply plugin: 'kotlin-android-extensions' apply plugin: 'kotlin-kapt' apply plugin:...

JDK is required for Kotlin? I have not used Android for a long time but now I find a new term, Kotlin, so my doubt is, jdk is required for kotlin? If kotlin will replace to java, so the jdk it is not necessary because according to me jdk is for develop on java, is correct? If it is correct then I have other doubt (this already it's old) why jdk is used for android if this already include an android sdk? P. D. i am going crazy, I need a single explication. I am new at this, I am sorry my bad english I have use google...

Failing to run Instrumented tests on a new Android Kotlin project I just created a new android application with Kotlin Support when i've tried to run the default instrumented tests it does not run and shows me this message: Class not found: "oussaki.com.pos.ExampleInstrumentedTest"Empty test suite. this the class i'm trying to run : @RunWith(AndroidJUnit4::class) class ExampleInstrumentedTest { @Test fun useAppContext() { // Context of the app under test. val appContext = InstrumentationRegistry.getTargetContext()...

Kotlin invariants Kotlin Code class Inva{ fun x(y:T) {} } fun main(args: Array) { var inva = Inva() inva.x(“123”) } Java Equivalent public class Vab { void x(T y) {} public static void main(String[] args) { Vab vab = new Vab(); vab.x("123"); } } Why does the Kotlin code allow the invariant, whereas the Java code is flagged correctly as invalid?

Integrate Interstitial in kotlin I want to show interstitial when button clicked and move to second activity using kotlin I found a code in the internet but the app keep crashing

How can I delegate an implementation to a mutable property in Kotlin? As to my understanding, the idea of delegating an implementation in Kotlin is to avoid code that looks like this: class MyClass(val delegate : MyInterface) : MyInterface { override fun myAbstractFun1() = delegate.myAbstractFun1() override fun myAbstractFun2() = delegate.myAbstractFun2() // ... } Instead, we can write the following code which should do the same: class MyClass(val delegate : MyInterface) : MyInterface by delegate Now, I'd like delegate to be a mutable...

What is a typealias in Kotlin and how is it being used in this implementation? I see there is a typealias keyword being used and then the invoke method is being called on that "type" Can someone please provide insight into what this is and how it is being used? typealias NewKittiesReceived = (Kitty) -> Unit class KittyRepository { private val timer = Timer() private val random = Random() private val period = TimeUnit.SECONDS.toMillis(1) internal fun receiveNewKitties(newKittiesReceived: NewKittiesReceived) { timer.schedule(object : TimerTask() { override...

How to reconnect a HazelcastClient to HazelcastServer after server restart I'm having a problem using the hazelcast in an architecture based on microservice and springboot. I keep one of the applications with being the application that will be the server of hazelcast and the others are clients of this. However if I have to update the application that is the hazelcast server, the clients applications of the cache overturn the connection to the server and when I up the new version of the server these client applications do not reconnect. Is there any off setting the...

Kotlin DateTimeformat returning wrong month Simple code, but something is wrong! I'm new to Kotlin, trying to take a date string and convert it into Date() format. When I convert back it gives wrong month. Example: var cal = Calendar.getInstance() cal.timeZone = TimeZone.getTimeZone("America/New_York") cal.set(2018, 1, 20) val date: Date = cal.time println(date) //This prints: Tue Feb 20 232559 EST 2018 Why am I getting Feb when month is set to 1 (January)? Ultimately, I want to take a string in the format of "MM/dd/yyyy" and...

How to show Progress dialog and dismiss on Item click override fun itemclick(position: Int) { binding.progressbar.visibility=View.VISIBLE binding?.barcode?.setImageBitmap(exchngeViewModel.getQrImageBitmap(qrCodeData[position], this!!.activity!!)) showDetail(position) binding.progressbar.visibility=View.GONE } fun getQrImageBitmap(data: String, context: Context): Bitmap? { bitMap = AppUtils.TextToImageEncode(data, context, bus) return this!!.bitMap } this is my code i want to display...

Type inference failed. Firebase JobDispatcher I'm facing the following error on this line: .setService(LocationFirebaseJobService::class.java): Type inference failed. Expected type mismatch: inferred type is Class but Class was expected Here is my code: val dispatcher = FirebaseJobDispatcher(GooglePlayDriver(context)) val myJob = dispatcher.newJobBuilder() .setService(LocationFirebaseJobService::class.java) .setTag("my-unique-tag")...

Using "m" prefix for variables in Kotlin Well, using "m" prefix for variables names became usual in programming, mainly in Android, but since Kotlin arrived, this minor thing bothers me a bit. Inside the parent class there's nothing new, but setting and getting variables from another class doesn't seems really comfortable, because in Java we create (and name) our setters and getters, so we can omit the "m", what doesn't happen in Kotlin, unless we walk in the opposite of conventions and repeat Java's technique. Java: public class...

'return' doesn't jump out of forEach in Kotlin I have this Kotlin code, why return@forEach doesn't jump out of forEach? It continues the loop until it finishes, is it a problem with reversed()?: rendered_words.reversed().forEach { rw -> if (rw.y - the_top > 0 && rw.y - the_top < height) { new_top = rw.y return@forEach } } smoothScrollTo(Math.min(text_y - height, new_top)) I tried replacing return@forEach with...

Inconsistency getting data from Firebase Database with the same data class On my Firebase DB I have two main branches for debug and release builds. The debug branch works fine but when the release branch is fetched, the price field always has a zero as value. Please note that having the field as integer or with a decimal on the DB makes no difference. This is how my data looks like: This is my data class with the issue data class JsonProducto(var id: String, var name:...

How to develop an android app from inside another android app [on hold] Deveolpment tools on android platform not windows or linux. Sample App

How to use ByteArray.getOrElse I don't undertand how to specify the default value for `ByteArray.getOrElse() function. I tried: myInt = dat.getOrElse(0, 0).toInt() but compiler complains with the following error: The integer literal does not conform to the expected type (Int) -> Byte How to specify the default value?

OkHttp MockWebServer fails to accept connections on new instance I'm using OkHttp MockWebServer to mock the server responses. I have implemented two tests classes, the first one contains two tests and the second one, one test. The first class works fine, but for the second class, there is an error because the socket server is closed. The first test class @RunWith(AndroidJUnit4::class) class LoginActivityTest : TestCase() { private lateinit var...

Kotlin LoggerFactory simplification anybody that uses SLF4J or similar logging approaches is busy with defining private val logger: Logger = LoggerFactory.getLogger(this::class.java) in each and every class to get a proper logger. Is there a better way to unify/simplify this for kotlin?

Local Broadcast not updating UI i have this code in my register user activity: val userDataChange = Intent(BROADCAST_USER_DATA_CHANGE) userDataChange.putExtra("aaa", "aaaaaaaa") userDataChange.putExtra("bbb", 123) LocalBroadcastManager.getInstance(this).sendBroadcast(userDataChange) and in the main activity the reciever: LocalBroadcastManager.getInstance(this) .registerReceiver(userDataChangeReceiver, IntentFilter(BROADCAST_USER_DATA_CHANGE)) and the userDatachangeReceiver function: private val...