Descending order ZoneDateTime in list kotlin I have list of ZoneDateTime. I want to order by descending order. I didn't find the solution. Can some one guide me. NearestResult(day=2020-05-09T20:09:03+01:00, event=xyz) NearestResult(day=2020-05-09T09:15:15+01:00, event=abc) NearestResult(day=2020-05-09T23:15:15+01:00, event=qwe) NearestResult(day=2020-05-09T14:00:40+01:00, event=aks) NearestResult.kt data class NearestResult( val day: ZonedDateTime, val event: String ) I tried some code but it's not working lis.groupBy { it.day...

Spring Boot Kotlin: Handling Controller Binding Errors I am having trouble catching and handling binding errors in my Spring Boot Kotlin application. Not sure if it's a Kotlin issue (I haven't had this problem in Java before), a form-urlencoded issue (I usually use JSON) or a me issue. Here's my controller code: @PostMapping( path = ["/"], consumes = [MediaType.APPLICATION_FORM_URLENCODED_VALUE], produces = [MediaType.APPLICATION_FORM_URLENCODED_VALUE, MediaType.TEXT_PLAIN_VALUE, MediaType.APPLICATION_JSON_VALUE] )...

What is a view model and how can I use it to replace findViewById with View Binding and I am working on a basic bluetooth app in android studio and I am having trouble with view binding. So far I have this in my MainActivity.kt override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) binding = ActivityMainBinding.inflate(layoutInflater) setContentView(binding.root) ... Later in the onCreate I have this line val btnONOFF = findViewById(R.id.btnONOFF) as Button and I would like to replace the findViewById using viewbinding but...

How can I filter array of <Any> by its type -Kotlin? I have an array arrayOf("Apple",46,"287",574,"Peach","3","69",78,"Grape","423") and I need to sort it: firstly numbers suppose to go like "3",46,"69"... and then words by alphabet... So I am trying first to divide them on separate arrays by type and then some manipulation. Do you have advice of how to solve this problem?

How to make End Date 1 day after the Start Day on android datePicker i have a project that should bring end date after the start date on android datepicker. (user will chose any date on start date and when user click end date what ever user choose end date should be one day after start date) for this purpose i have a Kotlin code as in below; private fun showDatePickerDialog(type: Int) { calendar = Calendar.getInstance() year = calendar!!.get(Calendar.YEAR) month = calendar!!.get(Calendar.MONTH) dayOfMonth =...

Is there a way to make the first digit of int always start with 1 in Kotlin Let's say I have the following class constructor: class Car(val brand: Brand,val modelName: String, val version: Int){} If for example, I want the version number to always start with 1. Is there a way to manipulate it in the class body to achieve this ? Meaning: val firstdigit:Int = abs(version).ToString().Substring(0,1) And then parse it to Int. But how to replace the original first digit after that? I'm just learning Kotlin and I got a bit stuck with this

Which Coroutine scope to use in AppWidgetProvider class? I am currently creating a widget and I am configuring the widget with a configuration activity and initializing the widget on onUpdate() of AppWidgetProvider. After that a CoroutineWorker will update the widget from time to time. I have set the updatePeriodMillis to 0. So simply my code would be override fun onUpdate(context: Context?, appWidgetManager: AppWidgetManager?, appWidgetIds: IntArray?) { if(!widget_configured) { //configure widget & start the service. } } So...

Flow<List>.map {} vs differents queries in room database I am developing an inventory management app in Kotlin. I developed a CustomListUtil class to manage user preferences and found it very useful to filter the lists from a function of the same class, so that my Dao had really few queries and then filtered the lists with Flow. At least at first glance my code looked neat and understood very well. Previous Dao code: @Dao interface ItemDao { @Insert (onConflict = OnConflictStrategy.IGNORE) suspend fun insert(item: Item) @Update //(onConflict =...

How to repeat empty Mono with (roughly) constant delays between attempts? How to repeat empty Mono with (roughly) constant delays between attempts so that it subtracts time spent executing Mono from the delay? I tried this val delay = Duration.ofSeconds(5) var count = 0 val res = Mono.defer { Mono.fromCallable { count++ }.flatMap { c -> println("${Instant.now()}: $c") if (c < 3) { // Thread.sleep(2000) Mono.delay(Duration.ofMillis(1000)).then() // Mono.empty() } else...

Kotlin Client Generator support for Enum Unknown Values I'm wondering if there is a way to generate a kotlin lib from an openapi spec that will support a default value if it doesn't serialize a known enum value. Ex: the Java Generator has the enumUnknownDefaultCase flag in its spec Ref from the kotlin generator seems to read in the config for the moshi serializer <a...

How to bring an Android launcher from background to foreground from a long-running service? I am creating an Android launcher that should be brought to the foreground after an IntentService that started before, finishes doing its logic (which takes up to 10 minutes), however, I read that IntentServices are deprecated. SO my quesions are: Do launchers keep running in the background even after closing them? If so, do I really need a intentservice that runs in the background to do background tasks ? What's the proper way of doing long-running logic processing in the background and then...

Alternative way for kotlin static methods Im kinda new to Kotlin and I was wondering how I could make a static method. I have this code: class Test() { var giorgor: String = "jiorgor" fun foo() = println(giorgor) } I want to access foo from somewhere else like this fun main() { Test.foo() // WantedOutput: jiorgor }

Google Map is not rotated I have this map fragment with android:rotation="90" to rotate it 90 degrees. However, it's not rotated when I run the app, why? Now, it looks like this: But, I want it to look exactly like this:

Native code awared of Kotlin coroutines on Android Is there any way to write a JNI adaptor for the native C library which supports external eventloop so that it could be Kotlin coroutines friendly? I need it for the Android app.

How to take payment using customer UPI ID How to take payment using customer UPI ID. How to set payee and payer in the link. upi://pay?pa=xxxxx@upi&amp;pn=payee&amp;am=5.00&amp;tn=Test_Transaction How to set payee Id,If customer enter his VPA.

Android crash when trying to use dependency injection to show language list on Bottom Sheet Fragment I like to show a language list when I press the button. I use dependency injection on the bottom sheet fragment but it crashes when the button is pressed. Is there something I do wrong in the code? Thanks. I try to use the following sample to learn the concept of hilt and digger. https://www.geeksforgeeks.org/dagger-hilt-in-android-with-example/ <a...

Loading data from a pointer and writing it back in Swift I'm building a video streaming app using Agora SDK (for Flutter). I also use a native-layer Raw Video Data plugin as a dependency, which gives me access to raw YUV420 frame buffers before they're encoded. I can access them via a Swift & Kotlin interface. I need to write...

How to increase Kotlin coroutines when running a test? I've implemented an integration test. It run some stuff, including two suspend functions which are run inside a launch{}. Now for some reason, when I run more than four of my integration tests, I have six, the fifth job gets cancelled and the IT fails. This is an excerpt of the code I'm testing: io.launch { temporaryStorage.storeFiles(businessProcess) .publishEvent(businessProcess, expectedDocumentType) .tapLeft { orchestrationFailure -> orchestrationFailure.handleFailure() } }...

Kotlin noarg plugin not initializing default values Hello I have the following code(jdk) build.gradle.kts plugins { kotlin("jvm") version "1.7.10" id("org.jetbrains.kotlin.plugin.noarg") version "1.7.10" application } noArg { annotation("com.MyAnnotation") } Classes and annotation annotation class MyAnnotation @MyAnnotation class A( var a: String = java.util.UUID.randomUUID().toString() ) @MyAnnotation class Ab ( var a: String = java.util.UUID.randomUUID().toString(), var b: String ) When I initialize A and Ab...

I'm trying to implement a Intent in Android to send GIFs directly inside chats in Whatsapp without the preview activity Can anybody help me out in this problem,there is nothing I found in android documentation and whatsapp help center documentation they are only allowing the 512x512px to directly send, but I want to send Gifs which are even larger than this size

onNotify ble android never called what I'm doing wrong? I want to read records data from glucometer. That characteristic is not able to read or write, only set notifications. Iuse writeDescriptor and it's return true but there is no any onCharacteristicChanged callbacks override fun onServicesDiscovered(gatt: BluetoothGatt, status: Int) { if (status == BluetoothGatt.GATT_SUCCESS) { Log.w("BLE", "onServicesDiscovered ") val service = gatt.getService(GLUCOSE_SERVICE) val characteristic =...

Can't increase ThreadPoolExecutor's core pool size I'm having issues dynamically increasing the core pool size of a ThreadPoolExecutor in kotlin. First I define my ThreadPoolExecutor like this: val POOL = Executors.newFixedThreadPool(20) as ThreadPoolExecutor Then I add some tasks to the ThreadPoolExecutor. After some time, in a different thread, while the tasks are still running: POOL.corePoolSize += 20 It returns: Exception in thread "Thread-0" java.lang.IllegalArgumentException at...

Add the Instance of the class to constructor parameter property I have the following class structure. The CarModel Class has a defects List which is of Type CarDefects. And I wanted to add the instance of the CarDefects class into this list of defects of carModel which is passed as a parameter for the CarDefects constructor. However i cannot the use the add method and the error message says the following: Unresolved reference: add class CarModel(val brand: Brand, val modelName: String, val version: Int){ var defects: List? = null inner class...

Unit Test Firestore CallbackFlow I wrote the following code to test Firestore data reading with coroutines' runTest function: @Test fun `callbackFlow should read trip`() = runTest { log("test started") var result: DocumentSnapshot? = null val flow = callbackFlow { log("callbackFlow started") val listener = firestore .collection("/collection") .addSnapshotListener { snapshot, e -> e?.let {...

Kotlin instanceOf Iterable I want to verify that Any is Iterable override fun funnyFunction(context: Any): Any { if(context is Iterable) // do something } Warning that i get is One type argument expected. Use 'Iterable' if you don't want to pass type arguments In Java the code is Object funnyFunction(final context: Object) { if(context instanceof Iterable) // do something } Anyone have idea how to do it?

Android + Kotlin + Hilt: [Dagger/MissingBinding] xxx cannot be provided without an @Provides-annotated method Still digging into the basic concepts of Hilt, and trying to make a simple example to work into my app with no success. My app is a multi-module app, and apart from the application project (where all the activities are) I have some modules. "Common" is one of them which includes some helpers (for the moment static classes (which I'm trying to migrate to Hilt modules). For my example, I've picked up the "ExceptionHandler" class (supposedly converted to a Hilt module) and trying to inject it in...

mockK throwing exception on mocked class methods @BeforeEach init { MockKAnnotations.init(this) class1 = Class1(obj1,obj2) } @Test fun `test something`(){ every { obj1.someMethod(any()) } returns "dummyResult" val request = Request().also { it.clientId = "partner-client-id" } val response = Response().also{ it.accessToken="dummyAccessToken" } with (class1) { every { methodOfClass1(request) }...

AWS SDK Kotlin is installed but can not be found in project Im building a REST API and part of it shall be handling media upload and download to and from AWS S3. Since im using Kotlin with Maven, I added a dependency to AWS S3 SDK to my pom.xml file like this: aws.sdk.kotlin s3 0.16.0 Maven install went well and everything passes together with my tests etc. Problem occurs when im trying to add S3Client to my code, the whole SDK is not found. The library is found in dependency tab in my InteliJ IDEA, also as part of external libraries as...

How can use filter and contains with multi-ArrayList in Kotlin so I only have elements which match the condition? I have a class called Person data class Person( val id: Int, val name: String ) data class IDs( val id : Int, val active : Boolean ) and an array list that has numbers of ids and another list of Persons val myStu = listOf(Person(1, "Name_1"), Person(2, "Name_2"), Person(3, "Name_3")) var ids = listOf(IDs(1,false),IDs(2,true),IDs(3,true)) var newIds = listOf(2,3,4,6) First I want to apply two actions to the myStu, first is to have a list that include all the items from myStu...