what does "cannot be provided without an @Provides-annotated method" mean @ViewScope @Subcomponent(modules = arrayOf(PresentorModule::class)) interface PresentorComponent { fun inject (fragment: ArtFragment) fun getPresenter(): Presentor fun getInfiniteScrollListener(): InfiniteScrollListener } @Module class PresentorModule() { @Provides @ViewScope fun infiniteScrollListener(func: () -> Unit, layoutManager: LinearLayoutManager) : InfiniteScrollListener { return InfiniteScrollListener(func, layoutManager) } } class...

Issue injecting DAO to an Activity im trying to integrate Room, dagger 2 and rxjava io.reactivex.exceptions.OnErrorNotImplementedException: lateinit property userDao has not been initialized i encounter the error above, how do i init/access my DAO in a activity after injecting it into an activity ? My build.gradle // --- Room --- // implementation "android.arch.persistence.roomruntime1.1.0-alpha1" implementation "android.arch.persistence.roomrxjava21.1.0-alpha1" kapt...

Creating Flowable blocking thread? I am working on moving calculation of DiffUtil.DiffResult to background thread and have the following code in my adapter to create the flowable: inner class AdapterFlowable { private val publishProcessor: PublishProcessor = PublishProcessor.create() val flowable: Flowable = Flowable.fromPublisher(publishProcessor) .flatMap { Flowable.fromCallable { DiffUtil.calculateDiff(it)...

If Kotlin is the standard language for Android then why there is no code written in Kotlin @developer.android.com? I am asking this question with whom who are willing to learn Android but they don't want to learn Java. I have learned Kotlin because 1) I personally don't like Java. 2) Kotlin is new era language so its good to have one new tool in your bag if you are a Software developer. 3) I read somewhere that its the standard language for Android. Now my questions are 1) If Kotlin is the standard language then why there is no code written in Kotlin inside developer.android.com? 2) There is one...

Non-blocking alternative to Object.wait()? I have one thread receiving packets from a local server: // Shared object: @Volatile lateinit var recentPacket: Packet val recvMutex = Object() // Thread code: thread(isDaemon = true) { while (true) { val packet = readPacket() synchronized(recvMutex) { recentPacket = packet recvMutex.notifyAll() } } } And I have multiple other threads waiting for packets, each of which should get the same packet that was just received: suspend fun...

How are secondary kotlin constructor variables passed in? I am looking at the solution for the gigasecond exercism exercise for Kotlin: http://exercism.io/exercises/kotlin/gigasecond/readme. I can understand how it needs two two constructor because LocalDate and LocalDateTime arguments are passed in when creating the class. What I don't understand is how the below secondary class constructor variables are passed in and used in the class. It seems like the...

Android Studio 3.0.1 I recently updated my android studio to 3.0.1 release and i have been having trouble with my gradle app compiling. I am having this error while trying to build my gradle on android studio 3.0.1 Error:The 'java' plugin has been applied, but it is not compatible with the Android plugins. I have updated my Java Development kit to the latest realese please help me out am a newbie. Below is my build script. I have updated my Java Development kit to the latest realese apply plugin:...

Is there a way to avoid multiple instances of code when mutating itself? This is written in kotlin but I'm pretty sure it's almost the same in java. something.setOnClickListener { availableReportRecycler.isActivated = !availableReportRecycler.isActivated if (availableReportRecycler.isActivated) availableReportRecycler.visibility = View.VISIBLE else availableReportRecycler.visibility = View.GONE } Is there a way in kotlin/java to simplify this code? I feel like it should be able to reduce it to something like (pseudo...

Error Handle on UI thread when http request returns an error I am using Fuel and Rxjava to make network calls. I have set my base URL to localhost, which at isn't serving anything. I want to be able to handle network errors so I can show some sort of error message on the UI to the user. Here is an example of my GET request fun getRandom(take: Int, responseHandler: (result: WikiResult) -> Unit?) { Urls.getRandomURl(take) .httpGet() .timeout(timeout) .timeoutRead(readTimeout)...

Can we automate rest services using KOTLIN Can anyone suggest if we can automate rest services using Kotlin? Does Kotlin has any rest assured library or any other to support API automation.

Equivalent Kotlin code to my F# functional code Can any one help me converting my below F# code into Kotlin: //namespace SysIO open System.Collections.Generic // for Dictionary printf "Hi, Let's start \n" let series = [|30;21;29;31;40;48;53;47;37;39;31;29;17;9;20;24;27;35;41;38; 27;31;27;26;21;13;21;18;33;35;40;36;22;24;21;20;17;14;17;19; 26;29;40;31;20;24;18;26;17;9;17;21;28;32;46;33;23;28;22;27; 18;8;17;21;31;34;44;38;31;30;26;32|] let initialSeasonalComponents (series : int []) slen : IDictionary =...

Career Advice for 2nd Year B.Tech Student [on hold] I'm a 2nd-year student pursuing my B.tech in Computer Science. I'm familiar with concepts of C and C++. I want to change my focus to app development should I start learning Kotlin or Swift? I haven't got my hands dirty in app development yet

Creating new instance of subclass of unknown type I have a class, Measurement package robokt.measurement abstract class Measurement : Number() { /** * The abbreviation for this unit of measurement */ abstract val units: String /** * The abbreviation for this unit of measurement */ abstract val value: Number } How can I implement the unaryMinus() operator fun, given that there are other classes implementing measurement, for example Inches: package robokt.measurement.length class Inches(override val...

Kotlin reflection error when calling function I was trying to cast an unknown given object to the required class using kotlin primitives conversion methods like this: private fun callSelfParser(origObj: Any, destClazz: KClass): Any { val methodName = when (destClazz) { Int::class -> "toInt" Char::class -> "toChar" Long::class -> "toLong" Byte::class -> "toByte" Float::class -> "toFloat" Short::class -> "toShort" Double::class -> "toDouble"...

Cant Run or Debug Kotlin In IntelliJ Idea since Jetbrains released a new version of IJ, i removed my old version and installed (2017.3.4) the final version !! but when i start a new kotlin project i don't have Run/Debug on my right click !! and when i click on Run from Run menu it gives me a small window that says [Run:Edit Configuration] !! i haven't seen something like this before!! and by the way when i enable the REPL from kotlin sub menu it shows an error : You’re running the REPL with outdated classes !! i reinstalled it...

WeakReference to function type parameter null behavior I understand that a WeakReference will allow the garbage collector to clean up its reference if it is no longer needed as a strong reference (such as an Activity being destroyed or ViewModel being cleaned up). But I'm trying to understand a case where my WeakReference to a function is returning a null reference at random points when the function's owning instance hasn't been garbage collected... Consider the following ViewModel: class SampleVM(dao: MyRoomDao) : ViewModel() { private val...

Why is Kotlin's mapOf(a to b, c to d) considered non performant? Kotlin's official "collections" page contains the following remark: Map creation in NOT performance-critical code can be accomplished with simple idiom: mapOf(a to b, c to d). Questions: a/ What is the reason behind this remark (the best explanation I could come up with is that the "a to b" expressions create an extra, transient, Pair object, but I am not sure). b/ What is the suggested...

Is there a way to suppress Kotlin's default import? Is there a way to suppress (e.g., via a commnad line flag passed to the compiler) Kotlin's default import of multiple packages? or - alternatively - to be selective about it?

BitBucket Pipelines Persist Data I would like to persist data within a run of BitBucket Pipelines. A simple case is my first test creates a user record in Mongo and the second one attempts to get that user, however, on Pipelines it always returns that the user record doesn't exist. I understand that I could use a mock repository but I prefer to not go with this route. Any help would be greatly appreciated. Here's is my bitbucket-pipelines.yml image: java:8 pipelines: default: - step: script: - bash...

Including class files in gradle build script I have useful java class files from a old project on my computer and would like to include them in a build.gradle script for a new project. I also am using a library off the Maven repository and a jar file on my computer. I'm only have problem with including the classes and no problem with either of the others. Here is the dependency block. dependencies { compile 'no.tornadotornadofx1.7.14' //works compile files('../lib/opencv-320.jar') //works compile files('../oldProject/com') }...

How to test sharedpreference that inject in repository in Android MVP Clean Architecture i've facing a problem to test sharedpreference in datastore. in actual datastore i implement three arguments, those include sharedpreference. in this case i want to store value, and get that value. mocking not help here. mocking cannot propagate actual value, that will be used by code. in second part. class FooDataStoreTest : Spek({ given("a foo data store") { val schedulerRule = TestSchedulerRule() val service: FooRestService = mock() val context: Context = mock() val...

Android kotlin how to have switch conditions without break statement I had switch in Java without break statement. when i converted to Kotlin. it has put When which i tested and executed only the condition i pass to that function here is the code of JAVA switch (version) { case 1: onCreate(db); case 2: db.execSQL("CREATE TABLE IF NOT EXISTS "); db.execSQL("CREATE TABLE IF NOT EXISTS "); } KOTLIN: when (version) { 1 -> { onCreate(db)...

Remove "this" callback in kotlin I'm a bit kotlin newbie and I'm trying to remove the callback instance inside the callback itself. What I'm trying to achieve it's something similar to the following code. private val myCallback = SomeInterfaceType { if(it.something) { someObject.removeListener(this@SomeInterfaceType) } } Of course it doesn't compile or else I wouldn't be asking here. So I ask, how to remove the callback from inside the instance of the interface?

Kotlin 1.2.21 + SimpleXml 2.3.0 - consume List error (must mark set get method) I'm trying to consume XML using SimpleXML by Retrofit 2. After hours of struggling with Kotlin I decided to try Java version and the convert then to Kotlin. And Java version worked well... error: java.lang.RuntimeException: org.simpleframework.xml.core.MethodException: Annotation @org.simpleframework.xml.ElementList(data=false, empty=true, entry=, inline=true, name=entry, required=true, type=void) must mark a set or get method I need a Kotlin model class that will be able to consume that...

Android Fragment Smooth loading I have a Bottom navigation view. when i press on one of my tabs a fragment with a viewpager (including 12 pages) should be load. when i press this navigation tab the animation stucks for maybe 0.2-0.5 seconds. that looks very laggy. okay, i know, loading my pager adapter and loading the pager fragments is many work and the fragments do some database queries. but everything is asynchronly. doAsync { val adapter = PagerAdapter(ctx, childFragmentManager) viewPager.adapter = adapter...

LiveData Observer not Called I have an activity, TabBarActivity that hosts a fragment, EquipmentRecyclerViewFragment. The fragment receives the LiveData callback but the Activity does not (as proofed with breakpoints in debugging mode). What's weird is the Activity callback does trigger if I call the ViewModel's initData method. Below are the pertinent sections of the mentioned components: TabBarActivity override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) initVM()...

Spring-mvc POSTED requestParam not supports unicode characters I'm new in spring-mvc, I 'm trying to post unicode characters to my method @RequestMapping(value = ["api/test"], method = [RequestMethod.POST], produces = ["text/plain; charset=utf-8"]) @ResponseBody fun saveData(@RequestParam(value = "myParam") myParam: String): String { println(myParam) // prints characters like á?¥á??á? á??á?£á??á??á? return myParam } It doesn't have any problem with ASCII character encoding params. I'm testing this service using postman.

Android app crashes when I quit the app if Parcelised data has been used at some point, even though that data was successfully Parcelized I have a strange crash on both the Genymotion Android simulator and my Huawei Nexus 6P. I have a screenshot that I am sending to another Anko Component successfully - obviously it is Parcelable: @Parcelize data class ColourBoardScreenShot(var screenshot: @RawValue BitmapDrawable) : Parcelable However, if I take the screenshot and anytime later quit the app by pressing the circle button at the bottom of the screen the app crashes with the following stack trace: FATAL EXCEPTION: main...

adding actionBar to a fragment with DrawerLayout in Kotlin going crazy with implementing aciton bar to my fragment,whatever I do I can not add a "title" or a menu to my toolbar (I used the code that is generated in android studio when creating new project with "Navigation Drawe Activity and put it in fragment- for referance)this is how my fragment looks like: class BaseFragment : Fragment() { override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?, savedInstanceState: Bundle?): View? { var...

How to create a JUnit 5 rule for Android activity? How to create a JUnit 5 @rule for Android activity? Before @get:Rule val mActivityRule: ActivityTestRule = ActivityTestRule(GeralActivity::class.java) After ???