RxJava2: Is chaining allowed inside mapper function? In the code below function f returns Single, Observable.map { line -> f(line).doOnError { e -> println("Error:$e") } } .subscribe({ record -> println(record) }, { e -> println("Error2:$e") }) println("Error:$e") inside the map won't execute, however I will be able to get the error printed in the subscriber. It looks like that the chaining inside the mapper function in not allowed. Is it correct? If yes, why? Edit: Also...

Upload file from angularJS controller to Spring writtin in Kotlin There are a few similar questions already on StackOverflow. I have gone through some of them, but they did not work for me. So please do not mark this question as duplicate. I want to upload a file on client side written in Angular JS and send it to Spring Controller wirten in Kotlin. I have written the code below in orde to do so, but it does not work. I get a 404 bad request response with a message that Required request part 'file' is not present Input Choose...

Strange Kotlin error after update: Duplicate entry Please check code below: class HTMLEngine : View { class HREFOffset(var YOffset: Int, var href: String) class ChapterHolder(var chapter: Int, var chapter_body: Node) Kotlin compiler says : Cause: duplicate entry: com/app/view/HTMLEngine$ChapterHolder.class

How does EnumClass.values() work in Kotlin? How does EnumClass.values() work in Kotlin? I mean will it create new Array every time, or it is lazy evaluated static, or something else?

Facebook SDK Single Friend selection with My mobile app uses Facebook SDK for authentication and users can invite one of their facebook friends who installed the app. One approach is makeing a GraphRequest to /me/friends and showing a new ativity with a RecyclerView.I didn't want to implement my own custom picker so tried to make the invitation over Game Request. root.show_friends_button.setOnClickListener { val content = GameRequestContent.Builder()....

capture events by sliding left or right using kotlin How can I capture events by sliding left or right using kotlin? I've implemented OnTouchListener to try to capture something, but nothing happens. class MyClass : Fragment(), View.OnTouchListener { override fun onTouch(view: View?, event: MotionEvent?): Boolean { println("test") println(event?.actionMasked.toString()) return true } }

Kotlin: How do I call a DialogFragment from within an Adapter class? I have a MainAdapter.kt class that handles a RecyclerView. In its Holder class, I use a OnLongClickListener that calls a function deleteCategory(categoryId) to delete an entry in my Firebase database. This works perfectly: class CategoryHolder(val customView: View, var category: Category? = null) : RecyclerView.ViewHolder(customView) { private val TAG = CategoryHolder::class.java.simpleName fun bind(category: Category) { with(category) {...

Vert.x Reactive Kafka client: chaining not working when writing? I am using io.vertx.reactivex.kafka.client.producer.KafkaProducer client. The client has a rxWrite function which returns Single. However I need to log error if any, during write operation. It apparently is not getting executed. I have written following working example. test(): Function to test the chaining and logging fun test(): Single { val data = Single.just(ArrayList().apply { add("Hello") add("World") }) data.flattenAsObservable { list -> list }...

What Are The Benefits Of Checking "include android instant app support" CheckBox? When I Create Anew Project I Found Anew Feature Of Android Studio ,Which Is "include android instant app support" . Then I Wanna Know What Are The Benefits Of This Feature.

Printing reverse loop in Kotlin [duplicate] This question already has an answer here: In Kotlin can I create a range that counts backwards? 4 answers how to print a simple loop in reverse in Kotlin as I am new to the language. As this is the code for normal loop. for(i in 1..0) { println("$i") }

NetworkOnMainThreadException when trying to run okhttp response code on UI thread In my Android app, I'm using AppAuth to authenticate the user with an OpenID connect endpoint, so I'm doing a bunch of asynchronous calls and when the last one returns, I'm using okhttp to get the final result and I want to show it in the UI of my activity, something like this: authService.performTokenRequest(authResponse.createTokenExchangeRequest()) { tokenResponse: TokenResponse?, tokenException: AuthorizationException? -> if(tokenResponse != null) {...

Spring NamedParameterJdbcTemplate Cannot Insert NULL using Kotlin I am using Kotlin with Spring Boot 2. I am just doing a simple insert with a field that may, or may not be null. However in Kotlin this doesn't appear to be possible using MapSqlParameterSource because the .addValue methods do not accept null or nullable types. This is rather unusual because insert NULL can be a valid use case. This was very straight forward and easy with Java and Spring Boot in the past. Is there a way to get around this, I really don't want to jump through hoops to do...

Kotlin - Documenting classes - Class Properties Since i switched from Java to Kotlin i had to rewrite my docs. Kotlin has its own documentation format or furthermore it extends normal javadocs as far as i see it. i have checked the official documentation: https://kotlinlang.org/docs/reference/kotlin-doc.html#kdoc-syntax which states that there is a property tag which allows you to document the classes properties. If i have a kdoc...

IntelliJ - completion suggestions order I'm wondering if there is a way to let IDE suggest methods before variables? When writing code like this it's a pain in the ass to select methods yourself (builder class example) Variable example: var message = "message" private set Thank you

How do I access the default ToolBar from an Activity in Android? I'm trying to access the default ToolBar from within and Activity's onCreateOptionsMenu function to change the Overflow menu icon (three dots icon). I want to use the setOverflowIcon method provided by this class. I have read the official documentation, posts on StackOverflow and other websites and everything fails. I tried for example Toolbar toolbar = (Toolbar)...

Modify the Deferred result Given an API (implemented by Retrofit) that returns a model. I wrap an old fashioned Call into a Deferred using the extention function: fun Call.toDeferred(): Deferred { val deferred = CompletableDeferred() // cancel request as well deferred.invokeOnCompletion { if (deferred.isCancelled) {...

Mock static java methods using Mockk We are currently working with java with kotlin project, slowly migrating the whole code to the latter. Is it possible to mock static methods like Uri.parse() using Mockk? How would the sample code look like?

Poll URL until JSON returns an expected parameter I'm using the SkyScanner API which I first hit with a request to create a session and then I use the session URL returned from that URL to then call until its status parameter returns UpdatesComplete. Here's what I have so far: lateinit var pollUrl: String skyScannerInteractor.createSession("LHR", "AKL", "2018-04-20", "2018-04-22") .doOnSubscribe { loading.postValue(true) } .flatMap { url...

Parse Json to Primative Array Kotlin Maybe this is simple, but I'm missing how to do this. I'm using GSON, kotlin, and retrofit Data.json { "array1":[1,2], "array2":[1,2] } DataObject.kt data class DataObject(array1: List, array2: List) The the above fails to deserialize the arrays.

Android kotlin - java.lang.string cannot be converted to JSONArray I'm trying to use a large json object to fill in a ListView. I'm not used to work with json in Kotlin so I need a little help here. I have uploaded my json data to: http://myjson.com/19ueyn API link: https://api.myjson.com/bins/19ueyn It is a Game of thrones array of 6 (season) objects each containing an array of episodes. I want my ListView to display...

Spring OAuth2 Password Flow keeps failing I'm trying to enable OAuth2 Password Flow in my Spring Boot application, however, I just can't get it to run, no matter what I try. There following are my configurations. For the TokenStore I configured a JdbcTokenStore bean and the UserDetailsService is simply loading the user from my custom user tables. I also added the the property security.oauth2.resource.filter-order=3. For Spring Boot I'm using 2.0.0.RELEASE and for Spring Security 2.3.0.RELEASE. Both the authorization server and the...

Show button when all EditTexts are filled out by user I have this login activity, when the user clicks on either Login or Register Button, different EditTexts appear. My question is how can i check if all EditTexts are filled out so the continueButton will be enabled? (When Login is clicked, email and password must be filled, and when register is clicked, email, password and username must be filled) <a href="" rel="nofollow...

How to construct MutableList based List in Kotlin? I hope to construct MutableList a based List b, how can I do in Kotlin? BTW, Code A is wrong var a:MutableList var b:List Code A var a=mutableListOf(b)

Uncaught TypeError: Kotlin.defineModule is not a function I am developing a web app using Kotin for JavaScript and the Kotlin React CLI. When I pushed my code yesterday everything worked fine. But when I started it up again today I am getting this error: Uncaught TypeError: Kotlin.defineModule is not a function at C\src\main\kotlin\kotlinext\js\Object.kt20 at Object. (C\src\main\kotlin\kotlinext\js\Object.kt20) at __webpack_require__ (C:\my_workspace\bwa-js\webpack\bootstrap e6d8ae87c0ef02bf2708:678) at fn...

android return non-null typeface by kotlin I am practicing to convert java code to kotlin code. code: class TypefaceProvider { companion object { private var tmpTypeface = Hashtable() @JvmStatic fun getTypeface(context : Context, dir : String, name : String) : Typeface{ var createTypeface : Typeface? = tmpTypeface[name] if(createTypeface == null){ createTypeface = try{ Typeface.createFromAsset(context.assets,"$dir/$name") } catch...

Kafka Stream - Unable to print key I'm trying to print the key value from my Kafka Stream - trying the following with no luck - any ideas? val stream = builder.stream(properties.inputFeedTopic, Consumed.with(Serdes.String(), JsonPOJOSerde(Track::class.java))) stream .foreach { key, value -> println(key) } stream .mapValues { it } .mapValues(::convertTrack) .to(properties.trackProcessed) fyi - I'm using the Kafka Spring framework. Thanks.

Android NDK GLThread I'm trying to create a simple animation in android using the NDK and unfortunately my code is throwing an Exception. A/libc: Fatal signal 11 (SIGSEGV), code 1, fault addr 0x0 in tid 16198 (GLThread 739) I didn't know what's the meaning of this error. These are some of my code. Coin.cpp void Coin::Render(GLuint textureId, GLuint positionHandle, GLuint texCoord, GLint matrixHandle, GLint samplerLoc) { // Bind the texture to this unit glBindTexture(GL_TEXTURE_2D, textureId); //...

Kotlin API call using Retrofit I'm new to Kotlin, Android and OOP in general (Natural-ADABAS background, never did Java, C++, etc) so I'm pretty desperate. I have an API whose data looks like this, an array of book details: I'm confused about data models. I know it's supposed to look like how the data in the API and return an array but how exactly do I code it in Kotlin? And then how do I parse it? I've read some tutorials but...

In the MainActivity java, how to call the anko class directly? I used the anko library to create a login view. class SingInView : AnkoComponent { override fun createView(ui: AnkoContext) = with(ui) { verticalLayout { lparams(width = matchParent, height = matchParent) textView("Member Login") editText { hint = "E-mail" } editText { hint = "PassWord" } button("Login") } } } and SingleInActivity.kt class SingleInActivity :...

Kotlin with Room and Dagger - compile error I'm tackling my first android kotlin app. Having got my first activity working with mocked data, I'm now trying to fetch data from a database, but the code won't compile. Kotlin code: import android.arch.lifecycle.LiveData import android.arch.persistence.room.Dao import android.arch.persistence.room.Query import com.midshipman.homeinventory.domain.TagGroup @Dao interface TagGroupDao { @Query("select * from TagGroup") fun getAll(): LiveData } This has generated this java code:...