How to cast the List received in the primary constructor to MutableList so that we can delegate the class to MutableList I want to implement the kotlin's MutableList interface by adding some thread safe features and if i want to implement MutableList interface and overriding only the stuffs which are unsafe for thread, hence I choosen delegation. Every time using List.toMutableList() it returns a new Instance of MutableList containing all the items in data. class ThreadSafeList constructor(data: List): MutableList by data.toMutableList() //different reference (new object created when using toMutableList()) {...

IllegalCallableAccessException in kotlin-reflect I use simple-xml in the Android app. Parsed member properties are debugged using Kotlin-reflect. Properties can be displayed correctly if @field: Element is used, but if @field: ElementList is used, An IllegalCallableAccessException occurs and debugging can not be displayed. Please tell me what to do. <a href="https://stackoverflow.com/questions/52482052/error-class-kotlin-reflect-jvm-internal-function-callerfieldsetter">Error: Class...

Kotlin 'when' - How to get lint warning in Android Studio So I have many Enums in my app which get used in kotlins when calls. For instance my enum class enum class MyFancyEnum { TYPE_A,TYPE_B, TYPE_C } is used in something like this: when (it){ TYPE_A -> { ... } } What I need is a warning (or even better an error) in case I have forgotten to distinguish between all branches. I can see, the compiler is highlighting this already and moving the cursor on it I get a message similar to that one: 'when' expression on enum is recommended...

Return String from a Method after RxJava call i am having a problem to return a value after i call a Service from the Backend, it is a String i get from the Service and after i call this service i want that method to return me that string I have tried saving it in a variable, saving it in sharedpreference but it always returns me an empty string. Yet when i Log.d the result i get from the service i can see that it returns me the thing i want but i want the Method then to return me that result fun getExchangePortalToken(): String {...

Disable hamburger icon to arrow transition animation fragment I replace my hamburger to custom icon but when i start a new fragment there's a default transition to hamburger to arrow icon. i would like to disable that animation. [from hamburger to arrow i'ts like this <a href="" rel="nofollow...

Using flatMap with a Completable I am trying to make an API call multiple times, passing in a different parameter. When no more data is returned, the rx stream should terminate. After each call, the data is stored in my local repository. Here is what I have: val startPositions = BehaviorSubject.createDefault(0) startPositions.flatMap { startPos -> App.context.repository.getConnections(startPos) } .flatMap { connections -> App.context.repository.storeConnections(connections) } .doOnNext { startPos ->...

How to call overridependingtransition on viewpager class in kotlin I have a view pager class.In that class onFling method i need to start a new activity with overridependingtransition.Is it possble? .If so then how.Please help me.

How to deal with "dirty children" in a dynamically updated TornadoFX view? I write an MVP simulation that does initialize the simulation "world" in the background, and then draws it to the UI. Here is the main view: class SimView : View() { val presenter: SimPresenter = find(SimPresenter::class) val canvas: Pane val registeredVehiclesRender: MutableList = mutableListOf() init { val (worldWidth, worldHeight, startingVehicles) = arrayOf(400.0, 400.0, 10.0) canvas = pane { } canvas.prefHeight = worldHeight canvas.prefWidth = worldWidth...

Type-mismatch returning sub-interface in Kotlin I have been developing with Java for several years, but I am new Kotlin. The compiler shows me an error when returning strategies[type] because I should return SubInterfaceStrategy instead of InterfaceStrategy. I don't understand because SubInterfaceStrategy extends InterfaceStrategy. Should I do some casting? I don't get it. interface InterfaceStrategy { companion object { private val strats = mapOf( Type.A to AStrategy(), Type.B to...

Picasso not work with 1.bp.blogspot.com url I tried to do everything but not working. I checked the link a thousand times and opened it in the browser and it works well. But another link works perfectly Do anyone tell me why this code does not work? class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) setSupportActionBar(toolbar) Picasso.get()...

kotiln- Class is not abstract and does not implement abstract base class member (RecyclerView) I am new to Kotlin, I tried RecycleView implementation from a tutorial but got this class MainAdapter: RecyclerView.Adapter() { val videoTitles = listOf("First Title","Second","Third") override fun getItemCount(): Int { return videoTitles.size } override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): CustomViewHolder { val layoutInflater = LayoutInflater.from(parent.context) val cellForRow =...

List data not showing in custom listView Kotlin Android I am trying to display a custom list view having two string values side by side in a fragment under tab layout but data is not showing. When I run the application nothing shows up just the blank screen. I followed this guide : javatpoint and tried to apply it to the fragment. CustomAdapter.kt import...

How can we create custom class of TextView with custom font in kotline? Can anyone help me to define a custom class for android Textview with a custom font in kotline?

Should I use FLAG_ACTIVITY_CLEAR_TOP in this case? In my app I have the following Activity flow: LoginActivity > DashboardActivity > (if user opts to change their password) > ChangePasswordActivity If the user successfully changes their password, I'd like to send them back to the very first Activity which is LoginActivity. I would like to pop DashboardActivity in the process to prevent any unwanted lingering Activities. Is it correct to use FLAG_ACTIVITY_CLEAR_TOP to start a new LoginActivity in this case? I'd like to know which flags are...

i am using this library "com.tenclouds.fluidbottomnavigation:fluid-bottom-navigation"but in that i m not able to menu click.please help me. thank you I want to replace fragment on menu selected i am using the clode for

How to draw route from A to B through multiple points on GoogleMaps? Imagine I want to go from A to B through 3 waypoints. I have this code, which forms the Google Maps direction URL: fun getMapsApiDirectionsUrl(): String { val origin = "origin=" + currentLocation.latitude + "," + currentLocation.longitude; val waypoints = "waypoints=optimize:true|" + loc1.latitude + "," + loc1.longitude + "|" + loc2.latitude + "," + loc2.longitude + "|" + loc3.latitude + "," + loc3.longitude val destination = "destination=" + loc4.latitude + "," +...

How to update textview value based on progressbar progress in Kotlin I would like to use ObjectAnimator to animate by ProgressBar progress. However, I wouldn't be able to update the text since I am not using a for loop. What is the best way to update the Textview while using ObjectAnimator? Here is what I've tried to update it but I failed to do so: val animation = ObjectAnimator.ofInt(progressbar, "progress", 0, 10000) animation.setDuration(2000) animation.setInterpolator(DecelerateInterpolator()) animation.start() var...

Type of the parameter must be a class annotated with @Entity I'm working with Room persistance databases in android but i get this error error: Type of the parameter must be a class annotated with @Entity or a collection/array of it. test.android.orca.com.ws2db.Models.User... user); Please help me This is my DAO : @Dao abstract interface UserDao { @get:Query("SELECT * FROM user") val getall: List @Query("SELECT * FROM user where name LIKE :name AND login LIKE :login") fun findByName(name: String, login: String): User @Query("SELECT COUNT(*)...

Service Not Registered on Microsoft Authentication Library (Android) I'm using a modified version of the example app from the MSAL Android library and for the past few weeks it worked like a charm but just yesterday it started crashing on me giving me this error: 2019-06-04 152207.807 20645-20645/com.example.myApp E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.myApp, PID: 20645 java.lang.RuntimeException: Unable to resume activity {com.example.myApp/com.example.myApp.Activities.LoginActivity}: java.lang.RuntimeException:...

Observable on map to detect when is added, updated of deleted an entry I have a map, in my case a ConcurrentHashMap which is updating when receiving some events on websocket. I want to implement an observable on this map to know when an entry is added, updated or deleted. I tried with an ObservableProperty but no methods are called when map is changed. var deviceCache : ConcurrentHashMap by MyObservable(ConcurrentHashMap()) class MyObservable(initialValue: ConcurrentHashMap) : ObservableProperty(initialValue) { override fun afterChange(property: KProperty,...

AutoCompleteTextView(AppCompat) issue while no character (Kotlin) I am using AutoCompleteTextView(AppCompat) by ArrayAdapter. I am getting result successfully when I type some character. But when I remove first character of this component, it consider null object in filter and giving me null pointer exception. What I tried so far From few old post I found that setThreshold can be solution, but its not working. I customized AppCompat's AutoCompleteTextView class and try to handle replaceText and performFiltering but its not working. I try to restrict...

What is the best practice to get read events from a users google calendar? I want to read events from a users google calendar and use the title of the events for future purposes in an android app. So far I've read the documentation about the google-calendar-api and the calendar-provider and so on but couldn't get any of the "getting started" guides to run. I also couldn't find any useful example on how to implement the api. I am aware of the process (User needs to authenticate himself with his google account and with that information the desired content can be...

Koline Dependency Injection: Dagger 2 or Koin or Kodein or Katana. Which is better? I am working on revamping an existing monolithic layered e-commerce app to multi layered app using the clean architecture. I am evaluating the series of framework to support development. I had experience in Dagger-2 DI framework, but for new application I wanted to use better DI. In android-kotlin space there are many DI frameworks available. Koin, Kodein, Katana etc.. Many have treadoff b/w the build time vs apk size vs run time. Please suggest me if any faced same issue and found better...

Verify Kotlin function as parameter in unittest I am trying to verify kotlin function in parameter in unit test but failed. Here is my code Unit test: verify(moveToNextStepUseCase).execute(validateStepAssemblyUseCase.validate(ID), { view.showCompleteAssemblyConfirmDialog(type) }, { view.showCompleteAssemblyErrorDialog() }) My moveToNextStepUseCase code: interface MoveToNextStepUseCase { fun execute(validator: () -> Observable, successAction: () -> Unit, errorAction: () -> Unit) } My calling code:...

How to write test cases for switch condition in android kolin I need to write test case for the switch condition in kotlin. Class.kt fun getEnvSwitchURL(applicationContext: Context, envSwitchInfo: String): String { val resources = applicationContext.getResources() val assetManager = resources.getAssets() val properties = Properties() try { val inputStream = assetManager.open("configuration.properties") properties.load(inputStream) val urlPref =...

Apply hibernate-gradle-plugin using plugins dsl syntax? I want to use org.hibernate:hibernate-gradle-plugin in my project with plugins dsl style. This is my build.gradle.kts plugin section: plugins { kotlin("jvm") version "1.3.31" id("io.spring.dependency-management") version "1.0.6.RELEASE" id("org.springframework.boot") version "2.1.5.RELEASE" id("org.jetbrains.kotlin.plugin.spring") version "1.3.31" id("org.jetbrains.kotlin.plugin.jpa") version "1.3.31" } Does anybody knows how to do this? All of the documentation and...

Android - Not granted USE_BIOMETRIC I am checking all permisions from the Manifest with the code bellow. Now I added USE_BIOMETRIC permission, because I want to use fingerprint, but this permission is not granted and I don't know why. I know that USE_BIOMETRIC is normal permission so it shouldn't be asked and should be granted when it's in the Manifest, but it's not. Checking for other permissions is working and all are granted or asked for it, only this one is not. I am testing app on 2 phones, emulated Google pixel with...

Null typesafety in Reactor code in Kotlin and IntelliJ IDEA I have the following code in my Kotlin class: Mono.just("banana").subscribe({ println(it) }) IntelliJ IDEA tells me that the variable "it" in this case has type "String!" (see screenshot). I'm not sure if this is an issue with Kotlin, IntelliJ IDEA or Reactor, but according to the Project Reactor documentation, it should have null annotations, and the Mono class does not...

How do I allow items of on RecyclerView that's linked to Room to be dragged into another RecyclerView? I have two RecyclerViews A,B that contain list of items X₁, X₂... Xₙ. All the items have an attribute X.recycler that contains either A or B to specify whether they should be displayed in RecyclerView A or B. The data of X₁, X₂... Xₙ is stored via Room. I want my user to be able to drag and drop X via LongTouch from A to B. What's the best way to go about this task?

Kotlin: Function using = when() to return value(s) I recently discovered this nice syntax for a function that only returns a value based on the input: fun getItem(value: Int): String = when (getPosition(value)) { 0 -> "Zero" 1 -> "One" 2 -> "Two" else -> "Other" } Is it also possible to use ranges or operators? I've tried doing things like:

0 -> "Positive"

Which is not accepted, and 0-10 -> "Postively small" is (naturally) seen as "0 minus 10" I think.