JVM - Open Webpage and run Javascript code I figured out that you can open a webpage like this (I am using Kotlin btw.) if (Desktop.isDesktopSupported()){ Desktop.getDesktop().browse(URI(url)) } Is it now possible to run some javascript code on the current webpage I just opened to click buttons etc.? (Without using external libraries like Selenium). Thanks

Cannot mock final Kotlin class using Mockito 2 I am unable to mock a Kotlin final class using Mockito 2. I am using Robolectric in addition. This is my test code: @RunWith(RobolectricTestRunner.class) @Config(constants = BuildConfig.class, sdk = 21) public class Test { // more mocks @Mock MyKotlinLoader kotlinLoader; @Before public void setUp() { MockitoAnnotations.initMocks(this); } } The test fails when we try to initialise the mocks in the setUp() method. In addition, I am using the following...

Why kotlin remove traditional for loop syntax with index? I still think "traditional" way of using for loop is very powerful with detail control of index? why kotlin guys remove that?

Is there a better way to decode html directly on Android? I've got encoded html where even tags are encoded into html entities Some <b> bold </b> text I'd like to display this as a spannable string in TextView, however the only way to do it is using Html.fromHtml() twice val decoded = Html.fromHtml("").toString() // Some bold text val spannable = Html.fromHtml(decoded) Is there cleaner way to do this?

Android Studio and Kotlin: Unresolved reference: also This code compiles and runs from Android Studio: val greeted = "World".also { println("Hello $it") } Yet the editor highlights also and it as errors and don't give any help with intellisense. apply still works and when I go to source I can see the definition of both apply and...

Kotlin data class delegate field declared in superclass or interface? I have several data classes which include a var id: Int? field. I want to express this in an interface or superclass, and have data classes extending that and setting this id when they are constructed. However, if I try this: interface B { var id: Int? } data class A(var id: Int) : B(id) It complains I'm overriding the id field, which I am haha.. how can I make A in this case take an id when it's constructed, and set that id declared in the interface or superclass? Thanks! Eduardo

is it a good idea to start learning hadoop and mapreduce using kotlin? [on hold] I am starting to learn hadoop and its ecosystem. My knowledge is limited to python, kotlin and JS. Is it a good idea to start learning hadoop and mapreduce using kotlin for getting job?

Kotlin Kapt: java.lang.IllegalStateException: endPosTable already set Trying to use the Kotlin maven plugin to build a kotlin application. Using Dagger 2 dependency injection framework. Get the following error when calling mvn clean compile package Can also be replicated by calling mvn clean package And then calling mvn package There seems to be a bug in maven 3 and java 8 that causes this, but I cannot find a work around for the kotlin maven plugin. [ERROR] Failed to execute goal org.jetbrains.kotlinkotlin maven plugin1.1.3-2:kapt (kapt) on project...

Preventing database from getting to big when storing data in Android app Im working on an app that is getting messages from a server (like email, or text posts), and I'd like to cache some of them so I don't have to make a server call and process them every time. It seems the best way to do this in Android is to store the data on a SQL(ite) database, which I can do just fine. What worries me is I don't want the database to get too big, so how can I prevent this? At the moment, all I can think of is to check the number of does whenever I write to the database,...

Kotlin - What is an Open Property? What is the difference between a Property and Open Property in Kotlin? The code below complains on me declaring the setter private and Intellij says private setters are not allowed for open properties. What is an open property? @RestController @RequestMapping(path = arrayOf("/parameters"), produces = arrayOf(MediaType.APPLICATION_JSON_VALUE), consumes = arrayOf(MediaType.APPLICATION_JSON_VALUE)) class ParameterController { @Autowired lateinit var parameterRepository:...

GSON - convert a string into a JsonArray I am trying to convert a string into a JsonArray. So far I have tried to do the following: Gson().toJson(string) Gson().toJsonTree(string) both throw an exception saying that the argument is not a JsonArray. Here is the string, as you can see it is a JsonArray:...

Kotlin: How can I use delegated properties in Java? I know that you can't use the delegated property syntax in Java, and won't get the convenience of "overriding" the set/get operators as in Kotlin, but I'd still like to use an existing property delegate in Java. For instance, a simple delegate of an int: class IntDelegate { operator fun getValue(thisRef: Any?, property: KProperty) = 0 operator fun setValue(thisRef: Any?, property: KProperty, value: Int) {} } In Kotlin of course we can use this like so: var x by IntDelegate()...

Recycler View - Overlap items from right cuts the last one I want to overlap each element in recycler to the right for that I am implementing the itemdecorator class and it does but it also cuts the last view from the left, any help on this would be appreciated thanks. public class ItemDecorator extends RecyclerView.ItemDecoration { private final int mSpace; public ItemDecorator(int space) { this.mSpace = space; } @Override public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) { //outRect.left =...

How to call a function in a different class KOTLIN, ANDROID STUDIO I have a game that can be played with a bot or a friend. So I made a new class in which it lets the user to pick who to play with and in the new class I made two buttons first one "BOT" second one "Friend" so for these buttons , I want to call a different function that I have in my previous class to this class. How can I do that? code for one of the functions fun playGame(cellId: Int, buSelected: Button) { if (activePlayer == 1) { txtView.text = "Player 2 turn"...

How to Send/attach multiple images I want to send multiple images I tried setType("image/jpeg) also ,I see this question posted in a lot of places, but didn't find correct answer val emailIntent = Intent(android.content.Intent.ACTION_SEND_MULTIPLE, Uri.parse("mailto:" + context?.resources?.getString(R.string.email))) emailIntent.setType("application/image") val uris = ArrayList() for (file in filePaths) { val fileIn = File(file) val u = Uri.fromFile(fileIn)...

Glide cannot load server image url Trying to load images with similar URLs like this "https://firebasestorage.googleapis.com/v0/b/content-office-e1931.appspot.com/o/usersData%2Fposts%2Fmedia_-KpGAURJbB33BKhTynV1?alt=media&token=26135949-a918-4572-9293-b639d43f04aa" But glide shows logs Load failed for with size [360x360] class com.bumptech.glide.load.engine.GlideException: Failed to load resource class com.bumptech.glide.load.engine.GlideException: Failed to load resource Previous logs Failed to find...

How to pass the values from activity to another activity in kotlin Good Morning all, As i am learning Kotlin for android development, i am now trying the basic programs like hello world and how to navigate from one activity to another activity , there is no issue in this My concern is When i move from one activity to another activity it works fine but i do not know how to pass the values between the activities I tired to set the values in one activity and retrieved in another activity it does not work Please see the code snippet below This is my main...

Kotlin: Idiomatic way to call (Int, Int) -> Int with a Pair<Int, Int>? fun sum(a: Int, b: Int) = a + b val x = 1.to(2) I'm looking for: sum.tupled(x), or sum(*x) Of course, none of the above compiles with Kotlin 1.1.3-2. So am I stuck with sum(x.first, x.second)?

How to configure Kotlin version in Android Studio? I have configured the Kotlin version in project's build.gradle. But in Other Settings->Kotlin Compiler , it shows an older version. How to fix that?

Nullable Type handling in RxJava with Kotlin When using RxJava2 in Java I have the advantage of map() filtering emitted null values automatically. However with nullable types in Kotlin I end up doing something like this: val loadConferencesSingle = service.getConferences() .map { it.conferences ?: listOf() } The call service.getConferences() in this case is a Single emitting a ConferecesResponse which looks like data class ConferencesResponse(val conferences: List? = null) So in case the complete emitted list of...

Kotlin list of vs array of [duplicate] This question already has an answer here: Difference between List and Array types in Kotlin 2 answers What is the difference of these two snippets of code? And how to decide which one to use? var array = arrayOf(1,2,3,4,5) and var list = listOf(1,2,3,4,5) With both codes...

Kotlin - Throw Custom Exception How can I throw a custom exception in Kotlin? I didn't really get that much off the docs... In the docs, it gets described what each exception needs, but how exactly do I implement it?

Kotlin - StringIndexOutOfBounds exception I have a lexer function which converts text like this: WORD "STRING" to actual tokens. This is my function: fun lex(file: String) : MutableList{ val tokens: MutableList = mutableListOf() var i = 0 while (i < file.length){ if (file[i] == ' ' || file[i] == '\n') i++ else if (file[i].isLetter()){ var word = "" while (file[i].isLetter()){ word += file[i] i++...

Get type of a variable in Kotlin How can I find the variable type in kotlin? In java there is typeof, but Kotlin does not exist: val properties = System.getProperties() // Which type?

Can I extend, in Java, a Kotlin delegating class? I'm trying to extend, in Java, a Kotlin delegating class and get the following error: Cannot inherit from final 'Derived' See code below. What I'm trying to do is decorate a method of a class. Any idea why Kotlin defined Derived as final? Is there a way for Derived to not be final so I can inherit it? Java: new Derived(new BaseImpl(10)) { // Getting the error on this line:

Cannot inherit from final 'Derived'

}; Kotlin: interface Base { fun print() } class BaseImpl(val x:...

How start other activity Kotlin (AppCompatActivity) to simple java Activity? Hello here is the sample code I'll use for start activity using kotlin to java activity class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val toolbar = findViewById(R.id.toolbar) as Toolbar setSupportActionBar(toolbar) val fab = findViewById(R.id.fab) as FloatingActionButton fab.setOnClickListener { view ->...

Error when trying to use Room library. [SQLITE_ERROR] SQL error or missing database I'm trying to use the new room library but I'm getting this error Error: There is a problem with the query: [SQLITE_ERROR] SQL error or missing database (no such table: Station) Error: Not sure how to convert a Cursor to this method's return type Warning: Schema export directory is not provided to the annotation processor so we cannot export the schema. You can either provide room.schemaLocation annotation processor argument OR set exportSchema to false....

Mocking JdbcTemplate works in Java but not in Kotlin We're moving our project to the Kotlin language. We decided to start from tests but faced with some strange behavior. Here is our test case: Service.java public final class Service { private final JdbcTemplate jdbcTemplate; public Service(JdbcTemplate jdbcTemplate) { this.jdbcTemplate = jdbcTemplate; } public long check() { return jdbcTemplate.queryForObject("SELECT COUNT(*) FROM table", Long.class); } } JavaTest.java (works fine)...

Removing from list while iterating: Java-&amp;gt;Kotlin the code worked in Java but when converted to Kotlin it no longer works. It throws an IndexOutOfBoundsException. Here is the original Java: grid_view.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView adapterView, View view, int i, long l) { String selectedItem = ((TextView) view.findViewById(R.id.tag_name)).getText().toString(); for (int j = 0; j < itemList.size(); j++){...

Invoke Operator &amp;amp; Invoke Operator Overloading in Kotlin I get to know about the Invoke operator that, a() is equivalent to a.invoke() Is there anything more regarding Invoke operator then please explain. Also, I did not get any example of Invoke operator overloading. Is Invoke operator overloading is possible? If possible then can anyone please explain about the Invoke operator overloading with an example. I did not get anything regarding this. Thanks in advance.