Kotlin - No properties to serialize found on class com.google.firebase.firestore.FieldValue$zzb This code bellow show the mapper used to cast Objet to Map class PointToMap : Mapper { override fun map(point: Point): Map { val map = HashMap() map.put(PointsDocument.DATE, FieldValue.serverTimestamp()) map.put(PointsDocument.EMPLOYEE, point.employee) map.put(PointsDocument.LAT_LNG, point.latLng) return map } } And this code bellow represent the method to set map to Firestore override fun add(point: Point) { point.employee =...

What are the best practise to write a GUI application? As I said in the title, what are the best practise? Is good enough pass the GUI between classes? Is good enough pass the view or the controller between classes in the MVC pattern? How can a class update a GUI component without passing GUI component at constructor or declaring static component in GUI or use getters? Thank you!

What's the recommended way to delay Kotlin's buildSequence? I'm trying to poll a paginated API and provide new items to the user as they appear. fun connect(): Sequence = buildSequence { while (true) { // result is a List val result = dataSource.getFirstPage() yieldAll(/* the new data in

result

*/) // Block the thread for a little bit } } Here's the sample usage: for (item in connect()) { // do something as each item is made available } My first thought was to use the delay function, but I get this...

Spring 5 reactive - How to zip two Flux in Kotlin I have this Java code: WebClient webClient = WebClient.create("http://localhost:8080/api/v1"); Flux games = webClient.get().uri("/games").retrieve().bodyToFlux(Game.class); Flux players = webClient.get().uri("/players").retrieve().bodyToFlux(Player.class); Flux.zip(games, players, (g, p) -> new Tournament(new ArrayList(), new ArrayList())); How can I translate it into Kotlin? val webClient = WebClient.create("http://localhost:8080/api/v1") val games =...

Kotlin - List not having the correct size after calling a function that modifies it I've got a MutableList declared like this: private var activeSubs: MutableList = ArrayList() I've got this function to download a json file from Firebase Storage convert it to a MutableList and finally set my activeSubs to it. private fun downloadListFromCloud() { val listRef = mStorageRef?.child("users/" + user?.uid + "/list.json") listRef?.getBytes(ONE_MEGABYTE) ?.addOnSuccessListener { Toast.makeText(this, "FILE DOWNLOADED",...

Spring configuration metadata in multi-module project not picked up by IntelliJ I have the following multi-module layout: rootProject ├── subProject library └── subProject application The library contains @ConfigurationProperties and has dependencies on the required stuff to generate the spring-configuration-metadata.json file. All of this works perfectely. The application has a dependency on the library and it can find the classes in there, autowiring with Spring works, … well, everything works. However, IntelliJ does not pick up the...

How to create an arrow-browsable VBox? I have a VBox composed by buttons. Every button has an action and a :hover pseudoclass. I want to make buttons "browsable" using up and down arrows: pressing UP or DOWN the selected one makes the :hover pseudoclass active for that button. This is what I'm currently trying: open class BrowsableVBox : VBox() { init { scene.setOnKeyReleased { if(it.code == KeyCode.UP || it.code == KeyCode.DOWN) { val selected: Node? = children.filtered...

How to transverse many-to-many relations from both sides of the junction with Objectbox? Given the following model @Entity class Student () { constructor(name: String) : this() { this.name = name } @Id var id: Long = 0; lateinit var name: String; lateinit var courses: ToMany } @Entity class Course () { constructor(subject: String) : this() { this.subject = subject } @Id var id: Long = 0; lateinit var subject: String; } If we have a student instance, we can access the courses collection; simple enough. But what if...

kotlin-js gradle outputfile wrong I'm working on kotlin-js example. I used this sample. When I was build frontend module(as shown in the picture below) I can't see web folder. But the resource files should be in web folder. What's wrong? buildscript { ext.kotlin_version = '1.2.30' repositories { mavenCentral() }...

How to mock the intermediate value which used inside a function? This is the method to test: It gets an URL and return a json after sending a GET request. It is a plain function which sits in a package rather than a method from a class. Same case for the extension method below. fun getJson (url: String): String { val connection = URL(url).openConnection() as HttpURLConnection connection.requestMethod = "GET" return connection.getResult() } This is the extension method: It will start connecting and read from result stream. internal fun...

How define a private property and use it [duplicate] This question already has an answer here: Smart cast to 'Type' is impossible, because 'variable' is a mutable property that could have been changed by this time 2 answers <a...

How to use MutableList remove(position) and remove(object) in kotlin? I have a MutableList with generic with Int, like MutableList. I wonder how to use remove(position) and remove(object) correctly?

When to update your app in play store/app store after publishing? Is there any particular time period for the app in the play store/app store to be updated (considering the fact that the app has no bugs or issues)

how to call mainActivity method in customeAdapter I am using recyclerview in kotlin and I am new to kotlin. I have used button.setonclickListner method inside this i want to call a method which is in my mainActivity how should i do it my custom adapter method holder?.button?.setOnClickListener( View.OnClickListener (){ Log.d("TAG", "job list position : ${jobList[position].id}") var id = jobList[position].id val p = Pattern.compile("-?\\d+") val m = p.matcher(id) while (m.find()) {...

how to add constructor in kotlin using Spring boot? @SpringBootApplication public class InfoServerSpringApplication { //this is my code in java public InfoServerSpringApplication() { System.out.println("Hello world"); } public static void main(String[] args) { SpringApplication.run(InfoServerSpringApplication.class, args); } } so that's how i print hello world in Spring boot java , i use constructor but how about in kotlin ? @SpringBootApplication class Kotlin2Application //constructor code to print hello world in kotlin fun...

Any way to achieve something like overriding an operator in kotlin? Recently I was working with lists in kotlin and had the following snippet: a = listOf(1, 2, 3, 4) println(a[-2]) Of course this causes an IndexOutOfBoundsException so I thought it would be nice to extend this functionality. So I thought one could override the get operator in the List class: operator fun List.get(index: Int): T = // Here this should call the non-overridden version of // get. get(index % size) I understand that extensions are just static methods...

How to pass data from Android native to React Native? I am new to the React Native integration in Android. I am creating a chat application and for that need to pass the UserId and another User information in my React Native component. How can I pass that from Android Native? I searched but I haven't found any successful lead. I tried doing it with SharedPreference, But didn't have any idea how to extract the sharedpreference holder in the React native. Are there any other way that I can extract this information? I have created ReactRootView in...

Error injecting Kotlin using Dagger I am trying to inject the ModelViewFactory object in the ViewModel and I get the following error. Have been working on this for days cant seem to figure it out. public abstract interface MinutemanComponent { ^ com.xyz.minuteman.view.meeting.detail.MeetingItemDetailsViewModel is injected at com.xyz.minuteman.injection.ViewModelModule.bindMeetingItemDetailsViewModel(meetingItemDetailsViewModel) java.util.Map

@DirtiesContext is not working with Spring Boot and Kotlin I'm trying to run some integration tests in Spring Boot. For this I believe we should use @DirtiesContext to clean up the database after each test has run. I have tried several methods right now, but all of them have the same effect. This is my setup: Spring Boot 1.5.10.RELEASE SQL Server 2016 Kotlin 1.2.21 This is the complete POM: 4.0.0 com.brabantia.esb log-db 0.0.1-SNAPSHOT jar log-db Log database application for TIBCO ESB...

Countdown from seekbar to inputs So I have this countdown.. It works perfectly with the seekbar. Minutes and seconds. So, I have been trying to find something for this (for 3 days already) and nothing. Which is to make the use of manual input, to have more accuracy. How can I change my seekbar to input? Say, either create a plaintext or click on top of the txtview for that? I am really stuck, any help would help Thanks :) import android.support.v7.app.AppCompatActivity import android.os.Bundle import...

Child ListView Android Kotlin not correcttt Hi i'm a beginner french developper so sorry for my english. I would like to do a Clickable ListView in Android to choose a Catgory for my restaurant Application, but when i click on a item, the child number is equals to 5 but my list have 11 elements. this is the code : and the Log : Thanks for your help

Why poor casting causes ActivityNotFound Exception in Android using Kotlin? I recently came across an exception while writing a program and it took a lot of time for me to debug simply because I was given a wrong exception by the compiler. Here's my code of my activity private var mCheatMap = HashMap() override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_quiz) mCheatMap = savedInstanceState?.getSerializable(KEY_CHEATER) as HashMap ?: HashMap() .... } But during the runtime,...

Kotlin views with synthetic binding and nullability I've noticed that when using Kotlin's synthetic binding, the view returned is non null (Kotlin will return View!). But this doesn't make much sense to me, since findCachedViewById can actually return null results, meaning that views can actually be null. public View _$_findCachedViewById(int var1) { if(this._$_findViewCache == null) { this._$_findViewCache = new HashMap(); } View var2 = (View)this._$_findViewCache.get(Integer.valueOf(var1)); if(var2 == null) { View...

What is a good approach to implementing a real time raster plot on Android? What is a suggested implementation approach for a real time scrolling raster plot on Android? I'm not looking for a full source code dump or anything, just some implementation guidance or an outline on the "what" and "how". what: Should I use built in Android components for drawing or go straight to OpenGL ES2? Or maybe something else I haven't heard of. This is my first bout with graphics of any sort, but I'm not afraid to get a little dirty with OpenGL. how: Given a certain set of...

RXJava2 merge cached data and subject i've a question about rxJava. I have an disk storage that returns an Object? from disk (Could be already saved or not) and an BehaviourSubject (This data comes from other class call, check code below): Code is: private val subject: Subject = BehaviorSubject.create() fun getElements(): Observable = Observable.concat(Observable.just(storage.getElement()), subject) .filter({ it.isPresent }) .take(1)...

Why generated ViewDataBinding class annotates property for "include" tag as Nullable I'm using Android Data Binding library to bind an xml layout that has an include tag layout.xml ... ... In the generated Databinding class for layout.xml I see this property: @Nullable public final com.example.databinding.SomeOtherLayoutBinding includedLayout; Why is it annotated as @Nullable? The include is in the layout, as I see it, is obviously non-null. What am I missing? It forces me to use non-null assertion operator !! in Kotlin code...

2 dimensional Dynamic array Kotlin. How to declare 2 dimensional Dynamic array in Kotlin? i am trying to do it with arraylist but it fails var dynamicarray =ArrayList(4,{ArrayList(3)}) //error it works fine for array but not for arraylist var staticarray = Array(4,{IntArray(3)}) // no error

How can translate the java code into kotlin? I'm writing the code with Kotlin, the code A can work well, but the Hint of Android Studio 3.0 tell me that getApplicationContext() is not good. How can translate the java code getApplicationContext() into kotlin? Thanks! Code A class UIApp : Application() { companion object { var instance: UIApp by NotNullSingleValueVar() } override fun onCreate() { super.onCreate() instance = this MobileAds.initialize( getApplicationContext(),...

java.lang.RuntimeException: Failed to invoke public android.arch.lifecycle.LiveData() with no args I'm trying to call API using Retrofit and Android architecture components but I'm getting this error java.lang.RuntimeException: Failed to invoke public android.arch.lifecycle.LiveData() with no args this is the data class for the response data class ForecastResult(val city: City, val list: List) appreciate your help!

child.getValue() is returning null while getKey() returns the right key I am trying to fetch data from a particular node in firebase database and store it variable. Following is the code that I have writen for it. bject FacultyCourseDataService { val courses = ArrayList() private const val TAG = "FacultyCourseDataService" private val mDatabaseReference = FirebaseDatabase.getInstance().reference val mAuth = FirebaseAuth.getInstance() val mUserUId = mAuth.currentUser?.uid private lateinit var mValueEventListener : ValueEventListener...