How can I make a generic function that works for all subclasses of a collection and at the same time accepts the parameters correctly? // Generic Function but not work as expecting inline fun C.dropElements(word: T): C { return when (this) { is Set -> (this - word) as C is List -> filter { it != word } as C else -> throw Exception("I can't implement all out of Collection types") } } fun main() { val originalList: List = readln().split(" ") val originalSet: Set = originalList.toSet() val word: String = readln() val dropElements1: List =...

Android studio endless compilation One time my android studio ran into endless compilation, and from then on that version of kotlin jvm plugin is always with endless compilation. Yesterday, that bug appears again with another version of kotlin jvm plugin. Two versions are invalid now and there must be more and more. Reinstalling or invalidating caches doesn't help. Could someone help?

How is Quarkus Reactive supposed to work with Panache for Kotlin? I'm trying out Quarkus Reactive + Kotlin, and I seem to have som issues figuring out how the data access part is supposed to work in this case. Quarkus offers: quarkus-hibernate-orm-panache-kotlin OR quarkus-hibernate-reactive-panache There is no quarkus-hibernate-reactive-panache-kotlin. It seems I have to choose between Kotlin or reactive functionality. Am I misreading this? And if not, how do people usually solve this problem? Do they select the Panache-Kotlin variant and wrap all...

How to translate this Kotlin code into Dart code? I'm trying to translate this Kotlin project into a Flutter project, I don't know about Kotlin so I'm learning/translating on the fly, very hard task. At present I'm trying to understand this piece of Kotlin code: sealed interface Result { data class Success(val value: T) : Result data class Failure(val throwable: Throwable? = null) : Result } public inline fun Result.mapSuccess( crossinline...

Can a Kotlin contract imply non-nullability of all vararg arguments of a function? I'd like to write a top-level function like this: @ExperimentalContracts fun containsNull(vararg objs: Any?): Boolean { contract { returns(false) implies (/* ???? */) } for (o in objs) if (o == null) return true return false } so that I can have a code like this compile with no errors if (containsNull(value1, value2, value3)) return doSomething(value1.myProperty) /* and similar calls multiple times, without the need to use the "?." operator */ but...

SingleChildScrollView not scrolling inside stack I'm trying to scroll through my stack widget , i have wrapped the stack widget with SingleChildScrollView , the widgets disappear and there is no scrolling when text gets bigger at the bottom of the screen , i have tried different ways to solve this issue but could not , i'm seeking some help , and thank you for it in advance . Stack widget code @override Widget build(BuildContext context) { String mealID = Get.arguments['mealID']; DetailsController controller = Get.find();...

How to implement 2 way scrolling- vertical and horizontal scrolling in kotlin? I want to implement a tab layout with a horizontal swipe or scroll view and in each tab view, I could be able to scroll vertically. For reference just like WhatsApp where there are tab layouts that are horizontally scrollable or swipeable and in each tab layout, there is a vertical scroll view in kotlin.

How do I create documentation app with Kotlin So I am a software engineer senior design student and I need some guidance with my project. I have 32 papers from which I want to create an android app that contains all of these forms, edit them, and print them. I have experience with Java, and I know that Kotlin is better, but I have never used Kotlin. What do you suggest that I should do? Are there any resources that would help me or have done similar things?

NPE if no radio button checked in RadioGroup This code val vehicleTypeRadioButtonID = binding.rgVehicle.getCheckedRadioButtonId() val vehicleTypeSelectedRadioButton: View = binding.rgVehicle.findViewById(vehicleTypeRadioButtonID) will return a NullPointerException error at the second line: java.lang.NullPointerException: binding.rgVehicle.findViewById(vehicleTypeRadioButtonID) must not be null if no radio button under it is selected. The problem is, when I tried to put the code inside if (vehicleTypeRadioButtonID != null){} Android...

how to set data in recyclerview from 1 to n relation in room database I want to set data (tests from specific subject) in recyclerview. viewModel.getAllTestsFromSubject(subjectId).observe(viewLifecycleOwner){ testAdapter.setList(it) } when I set it i get error: Type mismatch: inferred type is List< SubjectWithTests > but List< Test > was expected this is my data class for 1-n subject-tests relation data class SubjectWithTests( @Embedded val subject: Subject, @Relation( parentColumn = "subjectId", entityColumn =...

Waiting for coroutine finish before fragment close In my View Model I have created a function that uploads audio file to Firebase Storage.Then I want to close my fragment but only if the file was already uploaded so I have to wait for coroutine to complete job. How can I achieve it? I can use runBlocking and it works but I don't think that's a good idea. fun addRequest(request: Event){ scope.launch { val uri = repository.uploadAudioFile() request.audio = uri repository.addRequest(request) } } Then in my...

GestureDetector.OnGestureListener overridden methods for Android API 33 makes my application crash (Kotlin) I am using GestureDetector.OnGestureListener interface on my Activity. It was working fine with Android API 32 but after updating the Android API level from 32 to 33, onScroll method requires its motionEvent parameters to remove '?' already causing my application to crash when it receives null inputs. Please see below for the current interface: override fun onScroll( e1: MotionEvent, e2: MotionEvent, distanceX: Float, distanceY: Float ): Boolean { return false }...

How to GET data inside list&lt;data&gt; with another data as the condition to RecyclerView Hello Im working on project using Kotlin (for the first time). My problem is i don't know how to get data "fullname" inside "data" list where one of the data inside the list also getting use for the condition, the name is "Role" to my RecyclerView in my Activity. So i need show list "fullname" inside my RecyclerView where the "Role" is "Patient". Here is the DataFileRecord: data class DataFileRecord( @field:SerializedName("total") val total: Int? = null,...

How to show search result after backspacing the keyword? I'm trying to implement search in Kotlin. I have successfully to show search result when I type a word. But when I backspacing the word letter by letter, the search result still showing the same result like when the word still whole. Here is my MainViewModel.kt private var searchTerm = MutableLiveData("") private val spanData = MutableLiveData(SpanData()) private var data = MediatorLiveData().apply { addSource(searchTerm) { value = filterListPost()} } fun...

Why do I get `NullPointerException` when using `readLine` function in Kotlin? I created a Gradle application that simply receives some input as a String. When I try using the "run" task, I get "BUILD FAILED" due to a NullPointerException. Here is the main code below: package com.s12works.readLineTest fun main() { print("Enter text: ") val stringInput: String = readLine()!! println("You entered: $stringInput") }

Kotlin flow like ordered broadcast receiver in Android I'm looking for something in Koltin coroutines like the sendOrderedBroadcast in Android. The broadcast receiver with order and priority could abort the broadcast to prevent subsequent receivers with lower priority receiving it. I want to use Koltin Flow or Channel instead of Android's BroadcastReceiver since the business are irrelevant with android context. Is there any Flow or Channel already implemented functionality like that in coroutines? Or I just need to implement it by myself.

Kotlin Why Changing Local var also updating companion object's var If I clear() my local list (mList) it also clearing companion's Mutablelist (list) Why this happening explanation's are welcome :) I've a class with companion like this : class Data { companion object { var list:MutableList = ArrayList() } } If I create my local list something like this : fun main() { // some dummy data Data.list.add("Lion") Data.list.add("Cat") Data.list.add("Dog") Data.list.add("Cheetah") // my local mList val mList = Data.list...

in gradle, what is the equivalent of generateJava in kotlin project? In the netflix grapql code gen documentation what is the equivalent of generateJava in a kotlin project build script. And how can I specify the directory of generated codes? Also in the below code, should i add all my domain types in the collection? typeMapping = ["MyGraphQLType": "com.mypackage.MyJavaType"]

Failed to transform collection-1.2.0.jar (androidx.collection:collection:1.2.0) to match attributes I have a project with Jetpack Compose, and after updating Android Studio and adding libraries, I got the following error I'm using AndroidX and have the following in my gradle.properties: android.useAndroidX=true android.enableJetifier=true I use the following dependencies dependencies { implementation 'androidx.corecore ktx1.9.0' implementation 'androidx.lifecyclelifecycle runtime ktx2.5.1' implementation 'androidx.activityactivity compose1.6.0' // Material...

Please fix run botton on android studio not availble Please fix run botton on android studio not availble . I can't run to dev my app

Save a class created with the Builder pattern in Room I need to create a table in my db where I can save Filters so I created this class like this: @Entity class Filter private constructor( val name: String?, @TypeConverters(Converters::class) val sortBy: Sort?, val withGenres: List?, val withCast: List?, ) : Serializable { @PrimaryKey(autoGenerate = true) var id: Int? = null data class Builder( var name: String? = null, var sortBy: Sort? = null, var withGenres: List = listOf(),...

Why won't my UI update while a background task is running? I have this code that should show a counter while a background task is running: @Composable fun startIt() { val scope = rememberCoroutineScope() val running = remember { mutableStateOf(false) } Button({ scope.launch { task(running) } }) { Text("start") } if (running) Counter() } @Composable private fun Counter() { val count = remember { mutableStateOf(0) } LaunchedEffect(Unit) { while (true) { delay(100.milliseconds) count.value += 1 } }...

MPAndroidChart - remove empty space between datasets I am using a combinedChart with several lineDataSets and I would like to remove the empty space between those datasets. In the example below, I would like the X-Axis to jump from 200 to 400 and to not show the area between. Is there anyway to do that ? Thank you very much.

AppDatabase_Impl does not exist I'm new learning Kotlin and I'm developing a Notes app to practise with databases and viewModels. I'm having trouble generating my database and the app crashes when it should generate the database and shows me this error on the logcat: "java.lang.RuntimeException: cannot find implementation for com.example.blocnotas.database.AppDatabase. AppDatabase_Impl does not exist" This is how I made my Database class: package com.example.blocnotas.database import android.content.Context import...

How to use pixels in Jetpack Compose (for padding, fontSize etc)? My Goal I have gotten a simple Photoshop File I want to recreate what I see there Pixel by Pixel. My Target Device will NEVER change the Display Resolution or anything else. It should be pretty simple right? The values in Pixel are clear width = 111 height = 66 padding after divider = 15 padding after "PM" = 15 padding between "TIME" and "PM" = 8 pixelSize for "TIME" = 24 pixelSize for "PM" = 15 My Code: Row(...

best way to add many item in arraylist by model class hello this my model class for All Articles I create a variable for each article Then put the variables for each class into an array I have 40,000 articles and put them in 70 categories But this is the best way, is there an easier one?

AlertDialog hyperlink not clickable I have a alertdialog that contains a hyperlink, however the hyperlink isn't clickable. It does show as a hyperlink val termsDialog = AlertDialog.Builder(this@MainActivity) val termsView = layoutInflater.inflate(R.layout.termsdialog, null) val termsBox: CheckBox = termsView.findViewById(R.id.termsCheckbox) val termsMsg = Html.fromHtml("By using this application you accept to our Terms and Conditions and Privacy Policy. \nMore information <a...

How can I avoid a "Primary constructor call expected" in this case? I've created a Person class and a Student class here in Kotlin: In line 27, I'm trying to achieve a case where a user can create a "Student" class by providing 4 parameters: FirstName, LastName, Age, and Degree. I've also written the equivalent code in Java. I'm trying to achieve the Java equivalent code's Secondary Constructor in line 30: ...

Send Theme from Android App to Android Module I have a project that contains Android app and Android Module, how can I pass the app theme to to module? let say that we have a MainActivity inside the app that will lunch XActivity in the module and send the app theme.

Android - requestFocus to off screen element in recyclerView I am trying to scroll and request focus to an off screen element from a recycler view. I have a list of 15 languages. When app starts the user can select one language from the recycler. Then if the app starts again the recycler scrolls and request focusto that item. But imagine the user selects the last language from the list which is not showed in the recycler when the app starts. How to scroll and therefore reqeust focus to that element which is not currently showed in the recycler? I...