Expand array elements How to expand an array of objects containing an array of strings into an array of strings? I have: data class MyClass ( @JsonProperty("applicant") val applicant: String, val products: List ) { fun getCiss(): List = products........ companion object { data class Product( val cises: List) } } I have this JSON as request: {"applicant": "11111111", "products": [ { "cises":["111"] }, { "cises":["222", "333"] } ] } How can I convert List of Product to List of...

How to run main function Kotlin file on command-line with string array arguments i'm trying to run one of .kt files that i have for my side project and I suddenly wanted run my *.kt file that has fun main(args: Array) { ... } on command-line tool. I did install kotlin compiler, set up the path. All I have to do is to figure out how to pass args parameter through command line and cannot find a way to do that. I've looked through kotlin compiler options and <a...

KOTLIN MVVM architecture android I have developed an MVVM sample architecture code for Kotlin, but it have some issues. Can u please go through the code give me an proper solution github link: https://github.com/shamjins/MVVM. Current Issue noted. The issue is where the view model object created in main activity. i don't know how to create an reference of class having generic parameter in Kotlin, like "::class.java"

Android/Kotlin - Accessing assets folder from a top-level function In my app, I put helper methods in the top level, not contained in any class, so I can call any of them from anywhere. And I have an assets folder (app/src/main/assets) with text files in it. I get access to this folder inside Main Activity using this code val file: String = applicationContext.assets.open("folderInAssets/filename.txt").bufferedReader().use { it.readText() } However, it seems that I cannot access the assets folder from outside activities or classes. applicationContext...

Kotlin Generics - Call companion object method I've two implementation of RecyclerView.ViewAdapter, which are very identical and I want to unify them as a single class with a type parameter T. The only difference is one class uses ImageViewHolder and the other one VideoViewHolder. class ImageGridAdapter : RecyclerView.Adapter() { private val asyncListDiffer = AsyncListDiffer(this, diffCallback) init { setHasStableIds(true) } override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ImageViewHolder { // How...

Kotlin prints non-English characters as question marks I am trying to print Hebrew characters from a Kotlin program (running on the console). All the Hebrew characters are being output as question marks. I created the following simple test.kts script file for testing: println("שלום מקוטלין") // Try to print a simple non-Hebrew character too println("\u0394") // Greek Delta The file is properly saved in UTF-8 format. It prints: ???? ??????? ? I tried running it in Command Prompt, PowerShell (both in its native window and in Windows Terminal),...

Android: not being able to generate APK with third party library because of R8 I'm using a Kotlin library (https://github.com/skrapeit/skrape.it) in Gradle. The problem when using it is that I get the following error: ../../.gradle/caches/transforms-2/files-2.1/1b509451f305ac42006a30326c65c1f5/jetified-jetty-util-9.4.30.v20200611.jar com.android.tools.r8.a: MethodHandle.invoke and MethodHandle.invokeExact are only supported starting with Android O (--min-api 26) Execution failed for task...

How to securely communicate to a server via Android App I am setting up an app which will communicate to a server. I need to check if a user performed a certain action in app and then pass it to server. But how to pass it securely? It's easy to check the network log and see the details of the endpoint and parameters. How to pass the constant value only from the app across to the server without someone making it hit the end point via other than the android app?

RecyclerView leaves residue on scroll I have a big activity (let's call it BigActivity) where I have a lot fragments inside. From BigActivity I start another one (let's call it PainfulActivity) with an Intent the usual way. I have a fragment living inside PainfulActivity and a RecyclerView in the fragment (let's call the fragment PainfulFragment). In my PainfulFragment I make a network call and fetch my data. I have an adapter (let's call that PainfulAdapter) that I subclassed from RecyclerView.Adapter. <a...

How to access object in viewModel from outside activity or fragment class in Kotlin? I have a app in which I'm trying go implement the MVVM pattern for the first time. I have a simple fragment with the corresponding viewModel and a seperate class that deals with the swipeToDelete from the recyclerView which is in the fragment. The viewModel looks like this: package xxxxxx.example.org.keed import androidx.lifecycle.ViewModel class ListViewModel : ViewModel() { var keedList: ArrayList = ArrayList() } And the SwipeToDelete class like this: package xxxxxx.example.org.keed...

Proguard break class variable in Retrofit response I have WhoIAmResponse with ProfileResponse but if i try to get any value from ProfileResponse i get kotlin NPE. My attemp to debug in Logcat shows that profile response is obfuscated by r8 (but rules for it in proguard-rules) Timber.i(whoIAmResponseBody.result.toString()) Timber.i(whoIAmResponseBody.result.profile.toString()) if (whoIAmResponseBody.result.profile == null) Timber.e("profile NULL") else { Timber.i("profile NOT null") Timber.e(whoIAmResponseBody.result.profile?.name...

How can I write a Kotlin class to deserialize the below result from JSONAPI based api. android client is based on android, room, jackson json {"data": [ //{ "type": "product", "id": "8", "attributes": { "title": "Shirt", "price": { "currency": "USD", "excl_tax": "20.00", "incl_tax": "25.00", "tax": "5.00" } } "relationships": { "images": { "data": [ { "type": "productImage", "id": "8" } ] } } android client is based on jsonapi-converter koin jackson kotlin room the code import androidx.room.ColumnInfo import androidx.room.Entity import...

How to call function indirectly in Kotlin Assume I have a mutableMap: val MM = mutableMapOf() Now I define a function as a method for it: MM["testF"] = fun () { println("WOW") } Now I want to call it in another place: val MMTF = MM["testF"] as Function MMTF()

Getting a Contact Without Permissions Using registerForActivityResult New to Kotlin and Android development and, after updating some libraries, I had some issue with my previously working method of grabbing Contact details, so I decided to try out the new registerForActivityResult defined at https://developer.android.com/training/basics/intents/result instead of debugging my “legacy” code. In doing so, I’m no longer able to get this to work without requiring...

Can't use the model Entity for Room. Tried the following constructors but they failed to match I ask you for help. I've already spent a lot of time solving the problem, but haven't solved it yet. I would like to place this model in the Room. But I get problems all the time. I've tried removing annotation @Parcelize But the result hasn't changed. @Entity @Parcelize data class UserRepositoryItem ( var archive_url: String, var archived: Boolean, var assignees_url: String, var blobs_url: String, var branches_url: String, var clone_url: String, var...

Get request Header name and value I have the endpoint below where I get as a parameter an Authorization Header. I need to find out its name but I cant figure out how to obtain that information. The actual string I get is something like below: "Basic FJsdfFOisr8kZXKasrosLFcw2jf9fjsew9ltRlFEbsfeFA9d3jl1QU02Ulcxj28ADBlsfr=" @PostMapping(Endpoints.DEPOSITS.WITHDRAWALS) fun withdrawals(@RequestBody withdrawalsData: WithdrawalData, @RequestHeader(HttpHeaders.AUTHORIZATION) authHeader : String): String? {

Convert java to kotlin breaks contextmenu I've been converting a project to Kotlin and discovered a problem. The context menu from the java code is broken in the generated kotlin. This is a simplified test of the source from the project. It consists of only a main activity with a single layout and a context menu. The java version works but the kotlin version crashes. The only thing I can think of that is unusual is that the view I'm registering is an imageView in a RelativeLayout. java.lang.NullPointerException:...

intellij gradle based project unwanted output in bin/ dir I have a gradle based kotlin/java project using intellij IDEA for development. As the project is gradle based all build artefacts are under gradles build/ directory|folder. But there are also all .kt and .class files under /bin Does Intellij need to have these there? I could not find anything in the project neither in intellij settings, nor did google searches enlighten me on this. how to tell Intellij to work with the gradle build artefacts files under build/ and not to produce files under...

how to solve Too many arguments for public abstract fun enqueue(responseCallback: Callback): Unit defined in okhttp3.Call I follow this tutorial about kotlin programing language parsing API: , and for follow about tutorial link in below I use androidx api version 30 but I got stuck at 14:54, about "client.newCall(request).enqueue(object : Callback){ }" I got an error at the line...

How can I shrink a button to fit its text? Is there a way to take a programmatically-created button (not defined in XML) and shrink it so it matches the size of its text? Essentially I want these buttons to be much smaller: I have tried setting minWidth and minHeight to 0, to no avail: val btn = Button(view.context) btn.text = getTranslationLabel(t) btn.minWidth = 0 btn.minHeight = 0 translationsHolder.addView(btn)

IntelliJ IDEA does not find candidates for kotlinOptions property but project works fine I always create Kotlin projects with Gradle: File -> New -> Project -> Gradle -> Kotlin/JVM. The project works fine, however, IntelliJ IDEA highlights this part of the code: Is there a way to remove this warning? This is the entire build.gradle file: plugins { id "java" id "org.jetbrains.kotlin.jvm" version "$kotlinVersion" } group "com.alelad" version "1.0-SNAPSHOT" allprojects {...

Get values of a firebase database reference starting from the last index? Using firebase database , I am attempting to get 100 values starting from the last index working toward.Essentially reversing the Children and then getting the values, but reversing the children could be a issue(time wise) if there is a-lot of children inside of the reference. fun gatherrefs(Cont :Context , recyclerview: RecyclerView ){ var databaseref = FirebaseDatabase.getInstance().reference.child("MainTimeline") var reflistener = object : ValueEventListener{ //gathering...

Autocomplete Search Bar Google Maps Failed to load Results I create an autocomplete search bar google maps in my application, from tutorial that I follow there is only code like this XML Fragment private var mMap: GoogleMap? = null internal var placeAutoComplete: PlaceAutocompleteFragment? = null placeAutoComplete = activity!!.fragmentManager.findFragmentById(R.id.place_autocomplete) as PlaceAutocompleteFragment placeAutoComplete!!.setOnPlaceSelectedListener(object : PlaceSelectionListener { override fun...

Firebase verify user before sign up I want to verify a user before I can allow signup, however, the verification always fails on the first call even when data is correct fun signUp(email: String, password: String, idNumber: String): Task? { verifyApprovedUser(idNumber) return if (isAprroved) { firebaseAuth.createUserWithEmailAndPassword(email, password) } else { null } } private fun verifyApprovedUser(idNumber: String) {...

parsing http request using spring boot in kotlin I'm a newbie for Kotlin and spring boot. firstly, sorry for my bad English. POST connect/authorize HTTP/1.1 Host: op-server.com Content-Type: application/x-www-form-urlencoded client_id= &client_secret= &scope="openid vc_authn" &pres_req_conf_id= &response_type= &redirect_uri=rp.domain.com/redirect This HTTP post message is my object for parsing. after parsing, I want to convert this parsed message to JSON using spring-boot and Kotlin. Can you give me a reference and any advice? Thank you

How to call multiple API in multi time to get full data in Android Kotlin? I am using RxAndroid + Retrofit to call multi APIs at the same time and zip the response. But for each API, the server can only response 3M data per request. If the data is larger than 3M, the server will seperate it to multi parts and return only the first part with flag "IsComplete: false" in the response. And I have to call that API again until the key "isCompleted" in response is true. Currently, I have no idea to do this. Please help to give me any solution for this.

How to count the number of objects created in Kotlin? In the following code snippet i have created 4 instances of CompanionClass and want to know how many instances i have created , so have tried many ways but didn't work. Here i used companion object class to keep track of objects but i know it has no connection with objects because keepTrackOfObjects() is static. Can anyone help me solve this, please? class CompanionClass { companion object{ var numberOfObjects = 0 fun keepTrackOfObjects() = println("number of...

Delete path and its recursive child path in firebase cloud function I want to delete a document and all the collections that is inside the document from firestore. For that I'm using cloud function with node 8 as engine and it's actually deployed. But something isn't working as expected. this is my route / postsCollection / user / user_posts_collection / large documents So I want to delete the user document and all the things that contain inside that document => user_posts_collection and its documents Node.js, Cloud Function exports.deleteUserPostsDocument =...

Get Null Object with launch scope I have a project, where get a some data from request API. I use KOIN, Coroutines, and e.t.c. When loading data, I get a null object with the request API... It's strange for me, I know, analog is working (Github for example...). Can you help me solve this problem? Information of my problem I get in this module: class MovieViewModel constructor(private val serviceUtil: ServiceUtil) : ViewModel() { private val _uiState = MutableLiveData() val uiState: LiveData get() = _uiState init {...

Checking the state of data is completely written into the file or not? I have a set of data that i am storing into internal storage to be read for the next time. All i need to know if the file is completely written or not. because if not then for the next time read it will give a corrupt file. I need to avoid that.