How to get a list of bound singleton instances of one type? Given a kodein instance: interface SharedInterface {} class A : SharedInterface class B : SharedInterface class C : SharedInterface class D fun main(args: Array) { val kodein = Kodein { bind<A>() with singleton { A() } bind() with singleton { B() } bind() with singleton { C() } bind() with singleton { D() } } } Is there a way to get instances of A, B, C but not D from kodein? The closest I got was: val singletonBindings =...

How to use Kotlin with H2 and SQLite in Intellij When I try to use Kotlin in Intellij with either SQLite or H2, Intellij gives me this error: Exception in thread "main" java.lang.ClassNotFoundException: org.h2.Driver at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at java.lang.Class.forName0(Native Method) at...

What does !! operator do in kotlin? [duplicate] This question already has an answer here: What is the Kotlin double-bang 2 answers I just started android app development in kotlin. But could understand the use of !! operator. In Official Docs...

i can't make a contact between the activities in Kotlin Hello this is my first app with kotlin i am trying to make annual rate calculation app the problem is i have 4 activities every activity own button and edit's texts i wan't when The User click the button, the program get the numbers from Edit's texts and only make the calculation and save it somewhere and same work for the activity 2 and 3. but when he click the last button of the last activity i want to call all the results and show it in ViewText The Question is:How to save data Every time...

How do I make this not repeat the same thing I need this to print for each flight a number of "#" but its repeating it and I can´t fix it. This is the current output: TP23 ############################## TP23 ######### TP1971 ############ VN453 ##### TP23 ############################## TP23 ######### TP1971 ############ TP23 ############################## TP23 ######### VN453 ##### TP1971 ############ This is the expected...

Kotlin-Exposed's own example on their wiki does not work This code is pulled directly off of the Kotlin-Exposed Wiki yet does not work. Strange and frustrating that I cannot get it to work since I have an idea for a cool project which requires using a RDBMS. What am I missing? Is it broken? import org.jetbrains.exposed.sql.StdOutSqlLogger import org.jetbrains.exposed.sql.Database import org.jetbrains.exposed.sql.Table import...

Not being able to access data I'm having trouble at putting the information provided by a file into a variable import java.io.File class Voo{ var codevoo : String var origin : String var destination : String var day : Int constructor(codevooString,originString,destinationString,dayInt){ this.codevoo = codevoo this.origin = origin this.destination = destination this.day = day } } class Reservas{ var numCC:Int var name : String var codevoo : String var day : Int constructor(numCC : Int, name :...

Data received over BluetoothSocket is corrupted I have been writing an app that is supposed to send files over Bluetooth to another device that is running the same application. I had it sending files successfully but with one big problem... when i sent a file that was too large i got an out of memory exception. So in an effort to find a workaround i began to load and send chunks of the file. It seemed to be working the way that i wanted it too until i went ahead and opened up the received files. One of the first received photos looked like...

Is there a way around Java's inability to forward generic arguments to non-generic types? In C++ I can write code like this: class Shader { ... void setUniform(GLuint handle, int value); void setUniform(GLuint handle, float value); void setUniform(GLuint handle, const std::vector &value); ... }; class UniformValueBase { ... GLuint handle; Shader &shader; virtual void apply() = 0; }; template class UniformValue: public UniformValueBase { ... T value; virtual void apply() override { shader.setUniform(handle, value); }; and...

Is there a way to annotate the INSTANCE field of kotlin objects? I have a Kotlin object that has several fields exposed as static @JvmFields. The parser that I use (which I cannot edit or change) looks for public static fields and creates a configuration file based on those. Since the INSTANCE field is public too, the parser generates a new category called instance. Is there a way to add actual annotations to the INSTANCE field? I would want to add the @Ingore annotation to it so the parser does not use the INSTANCE field.

Draw custom view inside custom view I am working on a custom view, TreeView, which would display a tree given a root node. I am using the Kotlin language. Here's what part of it looks like at the moment: override fun onDraw(canvas: Canvas?) { super.onDraw(canvas) drawNodeAndChildren(canvas, rootNode) } /** * Draws a representation of a node and its children onto the canvas. * ... */ private fun drawNodeAndChildren(canvas: Canvas, node: TreeNode, ...): Int { ... // Calculate coordinates of rect val...

Android - Correct way of notifications and a Service I'm working on an Android APP that has to keep a connection via Bluetooth and listen to incoming calls, if it is running in the foreground or not. I was able to get it working by keeping a Service running when I got the Bluetooth connection and stopping it when disconnected. The Service: public class ConnectionService extends Service { private final int NOTIFICATION_ID = 327; @Override public int onStartCommand(Intent intent, int flags, int startId) { return...

Implement Spring Cloud Sleuth's TracingWebFillter in Spring WebFlux I have a Spring Boot Reactive application using Functional Endpoints ( Kotlin) that uses Spring Cloud Sleuth. I want to customize the response headers to include the trace id. I looked at the manual and saw the section on using the TraceFilter : 1 I tried to do the same using a TraceWebFilter, but it doesn't expose the constructors. Is...

How to inject Context into a Presenter using Dagger 2 I've been checking recently Dagger 2.14.1 with the new Android injectors. I'm using MVP and the Presenter is getting inject into the View correctly: class CustomApplication : Application(), HasActivityInjector { @Inject lateinit var activityDispatchingAndroidInjector: DispatchingAndroidInjector override fun attachBaseContext(base: Context) { super.attachBaseContext(base) MultiDex.install(this) } override fun onCreate() { super.onCreate()...

Kotlin, Bluetooth - intent.getParcelableExtra(Bluetooth.EXTRA_DEVICE) returns Null and crashes var pairedDevice = mBluetoothAdapter.bondedDevices deviceAdapter = DeviceAdapter(this,pairedDevice) bluetooth_listView.adapter = deviceAdapter layoutManager = LinearLayoutManager(this) bluetooth_listView.layoutManager = layoutManager mBroadcastReceiver = object : BroadcastReceiver() { override fun onReceive(context: Context?, intent: Intent?) { val device = intent?.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE)...

How to make a app that required Licence Key to use in kotlin? I want to make a paid app but I don't know to verify licence key system or Check that App is downloaded from Play store or Some Other External source, if it is Downloaded from play store he can use app if not he can’t?

WebView go back WebView can go back, forward and reload on virtual device. When I test it on real device back and forward doesn't work.As for reload it works fine. I know the same question was asked but i didn't find solution for my example. class Site : android.support.v4.app.Fragment(), OnBackPressedListener { var changeU: String = "https://www.google.ru/search?client=opera&amp;q=google&amp;sourceid=opera&amp;ie=UTF-8&amp;oe=UTF-8" override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,...

Writing code for JS and Java I'm trying to write a module of code which can be used with Javascript for the client side browser and Kotlin for a Java desktop application and Android app. The main logic manipulates a bitmap/png file. Is there a way which I can write an interface to be used and have different implementations of the interface for JS and Kotlin? For example, write a wrapper class for an image (load from image, set pixels, get pixels) in Java (using BufferedImage) and JS (using Canvas)? I'm new here so if...

How to verify passing a private function to a mock in Kotlin? I am learning Kotlin right now. I am trying my usual approach, with mocks and the observer pattern with Java 8 SAM, like this: interface Callback { void callback(long value); } interface HelperThatCallsBack { void registerCallback(Callback callback); } class ClassUnderTest { private HelperThatCallsBack someHelper; (...) public void doSomething() { someHelper.registerCallback(() -> doPrivateStuff()); } private void doPrivateStuff(long value){...

in kotlin how itemclicklistener use to display glide image in large view override fun onBindViewHolder(holder: MyViewHolder?, position: Int) { holder?.textdesc?.text = descarr[position].desc val url = descarr[position].url Glide.with(mContext).load(url).into(holder!!.rurl) here i want to implement onclicklistener to view glide image in large view

Activity slow load when there is a webView I have an activity that contains a button, the button initiates an intent to open another activity and sets some extra data, e.g.: val intent = Intent(this, ViewOnline::class.java) intent.putExtra(URL_TO_SEND_KEY, url) this.startActivity(intent) In the activity that is launched, it simply contains a webView and nothing else. In onCreate I have: webView.webViewClient = webViewClient webView.settings.javaScriptEnabled = true webView.settings.loadWithOverviewMode = true...

Remove last divider in recycler view - Kotlin I'm trying to remove/hide the last divider in my Recycler View but I code doesn't work. I use View to create divider and this code below to try to remove the last divider but doesn't work. The code below is inside fun onBindViewHolder(holder: CustomViewHolder?, position: Int) val separatorLine = holder?.view?.findViewById(R.id.separator_line) if (position == readingData.size - 1) { separatorLine?.visibility = GONE }else{ separatorLine?.visibility = View.VISIBLE }

Kotlin - spread operator in SpringApplicationBuilder Is there any alternative to using a spread operator in such case? Or should I ignore the warning?

Can't create sequence of Ints in Kotlin through succesor function. Says "Type Inference failed" I'm going form java to kotlin and am finding a bit of speed bumps in my learning. I'm trying to create a stream/sequence of natural numbers from the number 0 and a successor function S, through the generateSequence function. Here's what I've got: package core fun sequenceOfNumbers(): Sequence { return generateSequence(0){x -> S(x)} } class S: (Int) -> Int { override operator fun invoke(x: Int) = x + 1 } fun main(args: Array) { println(sequenceOfNumbers().take(10).toList())...

How to parcel List&lt;Int&gt; with kotlin I want to pass a data class (that contains list of int as a property) to other activity through Bundle and therefore i need to add Parcelable implementation to my data class. any idea about how to parcel this property? data class Test(val id: Long, val files: List?) : Parcelable { constructor(parcel: Parcel) : this( parcel.readLong(), TODO("files")) override fun writeToParcel(parcel: Parcel, flags: Int) { parcel.writeLong(id) } override fun describeContents(): Int {...

How can I change this to use "for loop" instead of `forEach` I have this two functions but Im struggling to change it to use a for loop and still do the same thing. The program is supposed to read a file with some flights and this specific part of the program needs to read the file using two different days that the user inputs then it needs to show how many passengers there are per flight and each day. And how it's done now works but Im trying to change it to use a for loop as I said before but doesn't work because I don't know how to do the same thing...

How to bind a Kotlin Function in Guice I have a Kotlin class similar to this: class MyClass @Inject constructor(val work: (Int) -> Unit)) { ... } and I can't figure out for the life of me how to bind an implementation of that function in Guice. I don't even know how to try and get the Java class for (Int) -> Unit, and the following also didn't work: class FunctionModule : AbstractModule() { override fun configure() { } @Provides fun workFunction(): (Int) -> Unit = { Unit } } How can I inject an implementation...

How to show an @Embedded attribute in a flat way in json I have this entity on my jpa module, @Entity class Company private constructor( @NotNull @EmbeddedId val id: CompanyId, @NotNull @Embedded val name: Name) { companion object { fun create(id: CompanyId, name: Name, repository: CompanyRepository, validator: CompanyValidator): Company { validator.validateCreate(id, name) return repository.save(Company(id, name)) } } } and my Name class is: class Name...

I implemented in java code an interface defined in kotlin. Got 'void' type not allowed here I defined a listener interface in kotlin like this interface FooListener { fun onCall() } which I think the return type is actually Unit in kotlin And then I implemented this interface in java FooListener l = new FooListener() { @Override public void onCall() { } } Here the onCall function implementation is auto generated by IDE I got an error while compiling which said Error:(107, 85) error: 'void' type not allowed here Can anyone help me to sort this out?

Unable to make a class for global variables in my Android app using Kotlin I'm trying to define a global variable in my application It is saying that the property must be defined or abstract. I've looked and tried to copy some soltuions but can't seem to get it to work any advice appreciated. package com.example.app.thisweekintown import android.app.Application class GlobalVars:Application() { var isConnected:Boolean }