Autosize ScatterChart series When I create a ScatterChart I always have this redundant blank space on the left and bottom and I want to remove it. Here is my piece of code. xAxis.autosize() and yAxis.autosize() don't change anything. vbox { add(ScatterChart(NumberAxis(), NumberAxis()).apply { val seriesMap: HashMap = HashMap() pointsList .map { it.decisionClass } .distinct()...

How get String from Unit in Android-Kotlin I'm use Okhttp3 GET method to a Web service val client= OkHttpClient() fun login_Chk(idString,pwString) { val req=Request.Builder() .url("https://www.hxxxxxx.com/WebService.asmx/Login_Check?ID=${id}&PW=${pw}") .build() client.newCall(req).enqueue(object : Callback{ override fun onFailure(call: Call, e: IOException) {} override fun onResponse(call: Call, res: Response) { println(res.body()?.string().toString())...

Java/Kotlin: Why does Jackson parse dates differently from SimpleDateFormat? I'm sure this is some form of user error, but I can't puzzle out what I'm doing incorrectly. I have a Kotlin data class that with a constructor field like this: data class CronEvent( @JsonFormat( shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd'T'HHmmss'Z'" ) @JsonProperty("time") val time: Date ) This gets populated by ObjectMapper that accepts a json string as a payload. For my unit test, I have a SimpleDateFormat object that I...

Kotlin - "in" keyword - what is is used for? i am trying to understand when to use the "in" keyword in generics as opposed to the "out" keyword (which allows assigning to subclasses). I am actually following this tutorial if it matters. Lets say we have the following class defintiion: class ParameterizedConsumer { fun toString(value: T): String { return value.toString() } } How does this even compile since value is not guaranteed to...

How to get LifecycleOwner in WearableActivity? I am facing a problem when I try to use LiveData from WearableActivity: val livedata = ... val observer = ... livedata.observe(this, observer) It worked when I was working with activity extending AppCompatActivity but it looks like WearableActivity does not implement LifecycleOwner interface, altough it does own a lifecycle, right? (observe method requires LifecycleOwner as the first argument). How can I make it work?

Create a reference from listview objects I have a list view populated with objects. When user tap on listview item I want to get the item and create a reference to pass it to an intent. Is that possible?

Kotlin val initialization using when Using Java I may want to initialize a final variable using a switch statement: final String finalValue; switch (condition) { case 1: finalValue = "One"; break; case 2: finalValue = "Two"; break; case 3: finalValue = "Three"; break; default: finalValue = "Undefined"; break; } In Kotlin, trying to do the same: val finalValue: String when (condition) { 1 -> finalValue = "One" 2 -> finalValue = "Two" 3 -> finalValue =...

How to GET facebook nearby events by coordinates? How can I get nearby events using Facebook graph ? Now I can use: https://graph.facebook.com/search?q=lancaster&type=event Is there any other path to get nearby events ?

after using Kotlin，my project happen that java.lang.NoClassDefFoundError If I use Kotlin, My application cause that java.lang.NoClassDefFoundError: SDCardUtils. and if I delete Kotlin. It's all right. public class SDCardUtils { /** * 判断SDCard是否可用 * * @return */ public static boolean isSDCardEnable() { return Environment.getExternalStorageState().equals( Environment.MEDIA_MOUNTED); } /** * 获取SD卡路径 * * @return */ public static String getSDCardPath() {...

Image and video capture like Snapchat/Instagram stories I have read online that snapchat and instagram have a different approach to capturing video as opposed to using the camera APIs in Android, this allows them to add filters/stickers etc to the captured content. Can anyone advise on ways to approach this? potential libraries, android classes etc.

Android Room many Entity to the same Table Hey is it possible to creating generic Table for many Entities? EnumType{ Student, Teacher } User(val id: Long, type: EnumType) Student(val id: Long, type: EnumType, val studentIndex: Long ): User(idm type) Teacher(val id: Long, type: EnumType, val teachedSubject: String): User(id, type) I'm getting result in Json in form of List And then I want to persist them to Room and then return in PagingLiveData form. Can I do that or I should create one class that handle all types like...

Stream handling in kotlin How will kotlin work the following code? Will a collection of 5000000 integers be created as temporary collection or will the filter feed its result immediately to the foreach which means, that only 20 integers will be looked at? If not, how would I be able to avoid the intermediate collection? class Tests { @Test fun test() { var counter = 0 (1..10000000).filter({ it % 2 == 1}).forEach({ counter++ if (counter > 10) return...

How to avoid kotlin factory class method by subtype? i have a question about kotlin: Imagine you have this: sealed class Graph : Serializable data class Graph1() : Graph() {} data class Graph2() : Graph() {} And you want to have a factory class that given a subtype of Graph gives you a GraphView. So, you have something similar to interface GraphViewFactory{ fun get(data: Graph1) fun get(data: Graph2) } And also you have the implementation for that. Is possible in kotlin avoid this method explosion of interface having one per...

Making Kotlin the new Gluon for Java Developers I like what the Gluonhq guys are doing. But currently, Kotlin is becoming the trend amongst java developers. My question is are there plans to make Kotlin the Free and open source tech stack for cross platform software development. That is building for IOS/Android/Windows/Web/Blackberry and Desktop using a single Kotlin Project...Just like what the Gluonhq guys are trying to achieve. Besides, Gluon is not free for a serious commercial app. Thanks guys....

How to convert this Java code to Kotlin Code? I'm learning spring boot and new to kotlin. A error will be reported when this Java function convert to kotlin code. How to rewrite this kotlin function? https://spring.io/guides/gs/consuming-rest/ @Bean public CommandLineRunner run(RestTemplate restTemplate) throws Exception { return args -> { Quote quote = restTemplate.getForObject(...

Anko doAsync() control during rotation of screen I need to load a list of all installed apps on a device in onCreate() of Activity. I want to use for it doAsync() method from Anko library, but how I can control it for example during rotation of the screen. Can I cancel it how with AsyncTask or something else?

mockito InjectMocks not working? I am trying to use a test implementation of a class and using that to be injected to the test using @InjectMocks but it doesn't seem to inject it. I tried using Spy but that did not work and instead created a blank mocked version instead of using the version I created inside my @Before function Here is my test code below: @Before fun setup() { someFunction = object : SomeFuntionContract { override fun save(test: String) { testData = test //breakpoint here but never...

recyclerview onClick getkey from firebase how do i get key in kotlin in recyclerview to send it to another activity? i tried using getKey() and positon but it doesnt work.. here is my code class RecyclerAdapter (val userlistArrayList,ccc Context): RecyclerView.Adapter() { var mcontext =ccc val Postdata = java.util.ArrayList() lateinit var ref:DatabaseReference override fun getItemCount(): Int { return userlist.size } override fun onBindViewHolder( holder: ViewHolder?, position: Int) {...

How do I export a tornadofx application? I finished writing a little tornadofx app in IntelliJ CE and now want to export it as a single file which can be downloaded and launched by users. For now it would be sufficient to provide a single jar file. But it would be also great to know on how to export a self contained installer for OSX, Windows and Linux. Unfortunately I don't know how to do any of that. Can you help?

View not updating after first time triggering LiveData when using background job in Android I'm building a debt application in Android using Dagger 2, Room and MVVM. My problem lies with the reactivity of my main view, where a list of debts are shown and you can tick them off. When this...

PropertyModel cannot work with Kotlin's private field with get() If a kotlin's model has a field : class MyModel { private val theValue: Double get() { return 1.0 } } and in the wicket page : new PropertyModel(model , "theValue") It will fail : WicketRuntimeException: Property could not be resolved for class: class MyModel expression: theValue The solution : remove the private modifier : class MyModel { val theValue: Double get() { return 1.0 } } Is there any way to get around this (keep the private modifier) ? (wicket 7.9.0 ,...

Proper structure for Gradle multi-module builds with IntelliJ IDEA I have a Kotlin project which is comprised of three modules: Core < Service < Web The structure is: /build.gradle /core/build.gradle /service/build.gradle /web/build.gradle The structure for the root build.gradle file is: buildscript { ext.kotlin_version = '1.1.60' repositories { mavenCentral() jcenter() } dependencies { classpath "org.jetbrains.kotlinkotlin gradle plugin$kotlin_version" } } subprojects { apply plugin: 'kotlin'...

jmethodID was NULL for a method with Kotlin I am using a native library and having the exception below even though the method exists. I have an init function that is also exported to MapController and it works as expected. However, the nativeLoadScene method causes an error. JNI DETECTED ERROR IN APPLICATION: jmethodID was NULL in call to CallObjectMethodV from int com.demo.lib.MyController.nativeLoadScene(long, java.lang.String, java.lang.String[]) JNI method JNIEXPORT jint JNICALL...

How to mix ScatterChart with horizontal and vertical lines I'm trying to create vertical and horizontal lines on ScatterChart together with points. I cannot find a way to mix them up. This is the code I generate points on chart. vbox { add(ScatterChart(NumberAxis(), NumberAxis()).apply { val seriesMap: HashMap = HashMap() pointsList .map { it.decisionClass } .distinct() .forEach {...

How to change view of specific item in RecyclerView Assuming that I have adapter with list of items and view for each item contains textview. How to access this item's textview and for instance change it's color. I can do this by adding a click listener to each item and doing that change of text color when item is clicked. But is there a way to achieve this in other way ? In my ViewHolder I got: val info: TextView = view.find(R.id.info_item) And a method: fun bindItems(listItem: List) { info.text = "Name:...

`NoClassDefFoundError: android.databinding.DataBindingUtil` when running androidTest for fragment with data biding It concerns the following Android library project: https://github.com/RoRoche/kAndroidModular/tree/master/kAndroidModular/userrepos I try to run the following unit test: <a href="https://github.com/RoRoche/kAndroidModular/blob/master/kAndroidModular/userrepos/src/androidTest/java/fr/guddy/kandroidmodular/userrepos/UserReposFragmentTest.kt" rel="nofollow...

Klaxon: Expected a name but got LEFT_BRACE How can I read a "complex" json using Klaxon? I'm trying to use klaxon's stream api as documentation say . I'm using the beginObject method. If I use a json as given in the example everything is fine val objectString = """{ "name" : "Joe", "age" : 23, "flag" : true, "array" : [1, 3], "obj1" : { "a" : 1, "b" : 2 } }""" But if I try to parse a json with a nested object as the following example I get...

EmptyClassBlock lint complaint on Json TypeToken I have a piece of kotlin code as below, gson.fromJson(data, object : TypeToken() {}.type) Detekt doesn't like it and complaint EmptyClassBlock - [] Is there any way I could resolve that?

Observable transformers made of Subjects I am currently implementing a pattern that has a view-viewmodel circular dependency. Though its really not dependency because they don't know about each other, all they know is that there is a stream of events and a stream of states. I came up with an idea of making the viewModel implement a function called toTransformer() which returns an ObservableTransformer that's composed of two subjects, an event subject and a state subject. private val eventStream: PublishSubject =...

Using Dagger2 @Subcomponent.Builder incorrect report When I using @Subcomponent.Builder, the error is reported like this: Exception is: org.gradle.api.tasks.TaskExecutionException: Execution failed for task 'appkaptDebugKotlin'. at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:100) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:70) at...