What's everything I need to initiate a TLSv1.3 handshake in Java? This is a rather complicated question. I need to initiate a connection over TLSv1.3 to a server that is running on Twisted (Python). I have looked all over the internet for somethng that helps me but I tried everything, nothing worked. This section in particular is very little documented which makes it hard for beginners to do anything about it. Here is my code: val sslcontext = SSLContext.getInstance("TLSv1.3") sslcontext.init(null, null, SecureRandom()) val...

Android Studio is not recognizing Kotlin classes in the middle of Java classes The class called Google Mapas (which is a class in Kotlin in the middle of the Java classes) is created, programmed without errors, and declared in Android Manifest without errors. Google Mapas means Google Maps in Portuguese language. However Android Studio does not recognize the Google Mapas class. File in attachment: https://uploaddeimagens.com.br/imagens/PTro5Gk Please, what to do?

I want to turn on the light with the camera of the android terminal activated I am Japanese. Please forgive me for questions in poor English. I couldn't get an answer on the domestic question site, so I would like to consult with overseas experts. Purpose I want to start the camera of the terminal and turn on the "light next to the camera" while previewing the camera image. What I did I created an app that launches the camera and previews it on the screen. The code is shown below. //MainActivity.kt package com.example.mycamera2application2 class MainActivity :...

Look for the very basic term for a certain callback I am coming from the embedded world and I am quite new to Kotlin. I know there is some mechanism I can inherit and use in my class, but I don't know the name exactly for this mechanism for Android. What I am looking for is: I have my Activity and this one instantiates my CustomClass My CustomClass perform some background tasks like handling BLE asynchronous communication CustomClass does not know when some packets will be received. Once the package is received, the CusomClass should call back...

Is the Kotlin term "mutable" wrong? The way I understood things is that the word "variable" referred to the capability of a reference to be reassigned. "constant" meant a reference cannot be reassigned. Essentially the difference between final or not in Java. var something = new obj() -> reference can be re-assigned val something = new obj() -> cannot be re-assigned To me "mutability" meant the ability to modify the REFERAND/OBJECT itself, not its reference. I.E. the object being referenced. But Kotlin doesn't prevent that. You...

How to use STOMP in kotlin? First, I'm so sorry about my English. I'a Kotlin beginner. Then, I want to make STOMP Chat API with Kotlin. Simple Api, but I can't make it.. and I don't know why. The system I think is User (session) can make chatRoom, and User can subscribe chatRoom. Server can send messages to chatRoom(sbuscribe). no lombok MariaDB, JPA My package is chat controller ChatController.kt RoomChatController.kt dto ChatMessageDTO.kt ChatRoomDTO.kt repository ChatRoomRepository.kt service ChatRoomService.kt...

Type argument is not within its bounds: should be subtype of 'NavArgs' for Kotlin Android I was running the following fragment code for passing User class data between the "list fragment" and the "update fragment" using navArgs. But I got the error Type argument is not within its bounds: should be subtype of 'NavArgs'. Below is my update fragment code which is receiving the data and after is the fragment navigation map in XML. I am following a tutorial on this so my terminology may be a bit imprecise, sorry. I should also say that I am working with the room database. Thanks for...

Android auto-click programming I want to click on the screen by location, X, Y In a programming way I tried to use this method. how automatically perform touch in android programmatically

Math Function to convert Digits in Android - Kotlin I am hoping for below outcomes : If Input => 25.69 - OutCome should be 25.6 If Input => -0.40 - OutCome should be -0.4 If Input => -0.004 - OutCome should be 0 or 0.0 To achive this I have tries as below : current=25.69 Log.e(">>> ceil ",">>> "+Math.ceil(current)) Log.e(">>> round ",">>> "+Math.round(current)) Log.e(">>> floor ",">>> "+Math.floor(current)) But getting out come as : ceil: >>> 26.0 round: >>> 26 floor: >>> 25.0 How can I get 25.6 ?

Why does local variable in Java have to be final in lambda (or anonymous class), but in Kotlin it doesn't have to? Java: In this method, compiler gives error "Variable used in lambda expression should be final or effectively final": void javaAnonymousClass(Button button) { String localVar = "10"; button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { localVar = "5"; } }); } Java: In this method in "Variable 'localVar' is accessed from within inner class, needs to be final or effectively final" void javaLambda(Button...

Sort a list of Class by a specific attribute Hi I'm new in android development (kotlin), here is my problem: I have an ArrayList class (ProductStore), in this class there is another class (StorageType) in which there is a string (libellus) with which I want to sort my ArrayList (or rather constitute groups where the string (libellus) is identical. How can I do it? data class Stock( val product: ArrayList ) class ProductStore { var quantity: Double? = null val expiration_date: String? = null val product: Product? = null...

My Toast alert does not appear during android emulation I am new to Kotlin android development, I don't understand why my "toast" is not showing or working properly during emulation. Here is the main activity of my application: package paris.ksainthi.soundpark import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.text.Editable import android.widget.* class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState)...

Question of best practice in Kotlin to save an object I'm looking for the best way in Kotlin (/ Spring Boot) to save in ObjectA ObjectB (and other values) in my service: fun create(objectARequest: ObjectARequest): ObjectA { val foundObjectB = objectBRepository.findById(objectARequest.objectBId) val objectA = ObjectA( id = UUID.randomUUID(), ... objectB = foundObjectB.get() ) return objectARepository.save(objectA) } My question is related to this line objectB = foundObjectB.get(): This is the Java way...

Is there a scope function returning previous value? I need to perform some operations on a mutable list and use its previous value. Something similar to also except that it should return the previous value. val localList: List = mainList.alsoButGetPrevious { it.clear() } Before I write this function, is there an existing one that does this?

Exclude kotlin libraries from jacoco report in kotlin multimodule gradle project using kotlindsl I'm struggling with jacoco and report aggregation. I used sample from gradle and I get to the point where aggregation works and I have some output in module aggregation. But output is containing . How to exclude it from report? Demo project is here <a...

How to reach ArrayList from getSerializable insted of Serializable? I'm put ArrayList into bundle: private val data: ArrayList = arrayListOf() override fun getItemCount() = data.size fun submitData(data: List) { this.data.apply { clear() addAll(data) } notifyDataSetChanged() } override fun createFragment(position: Int): Fragment { return if (position < data.size) { DayWeatherFragment().apply { arguments = Bundle().apply {...

I want to make circles connected with a line Im new with no experience but I want to make 2 circles connected with a line, also circles would be moveable like floating widgets whilst connected with a line. I took plenty of tutorials but non helped. Also this should be an overlay so I can use that while in another app. Android Studio, Kotlin or Java

single click -&gt;no animation onhold-&gt;Animation I'm new to kotlin so I have no clue to implement this. I want to implement a button like snapchat, where single click takes pic, and on hold makes the button animation, and Button animation should be reset after the animation ends or after the user releases the finger but in my code Either one of the Ontouch is only working. my code for single tap val gestureDetectorCompat = GestureDetectorCompat(applicationContext, object : GestureDetector.SimpleOnGestureListener() { override fun...

Direct tokenization in Google pay Android Hello, Im was trying to integrate the google pay button for the first time. I dont have a payment gateway. So I want to use direct tokenization method, But i dont know What is DIRECT_TOKENIZATION_PUBLIC_KEY. I do know how generate a public key. But how to use it for Google pay?. Is it just Pasting the public key in the code? Please Im already 19, I just wanna learn these things before...

Generic initialization of KafkaCache I have a problem making the initialization of a KCache cache generic. The code is as follows: class MyCache(name: String, test: Boolean = true) { private val cache: SortedMap init { if (test) { cache = sortedMapOf() } else { val cacheProps = Properties() cacheProps[KafkaCacheConfig.KAFKACACHE_BOOTSTRAP_SERVERS_CONFIG] =...

Stop gninnipS My sdroW! / CodeWars / 6 kyu I cannot find a solution to this problem. Maybe I need to return other values in a loop? Write a function that takes in a string of one or more words, and returns the same string, but with all five or more letter words reversed (like the name of this kata). Strings passed in will consist of only letters and spaces. Spaces will be included only when more than one word is present. Examples: spinWords("Hey fellow warriors") => "Hey wollef sroirraw" spinWords("This is a test") => "This is a...

Reloading the URL of a Webview I have a webview that is displaying a specific page from a website (an OAuth authentication page). When the user validates the page, s/he will be redirected to a new page with an URL like https://localhost:8080/.... I would like to detect that and change it to a file:///... URL. I tried to modify the onPageFinished function (see below), but it doesn't work (NB: my code sends a message by Bluetooth with writeMessage to get the URL of the OAuth service back in onReadData) : class...

Google Play: Bundle was not signed I'm creating app in Kotlin and I paid Google developer account. But there is some problem with upload .aab file: The Android App Bundle was not signed. I readed all topics at Stackoverflow about it and tried all solutions. Not works for me. signingConfig signingConfigs.release in build.gradle ends with this error: Could not get unknown property 'release' for SigningConfig. It works only when I set signingConfig. I'm using also this: minifyEnabled false and debuggable = false. So what another...

Try and catch with Livedata I have an app that displays a list of movies. There are several types(action,comedy,trending,etc) and there's also a search functionality. I'm storing the search results in a variable using switchmap. I'm using try and catch to know what to display. However, I'm having trouble using the search results variable in the try and catch, specifically the error "Cannot assign to 'value': the setter is public in 'getMovies' " Below is the viewmodel. Any help is appreciated. MoviesListViewModel.kt...

How to add multiple item in PagingData of paging 3 library android? I would like to add some item in current paging data which already contains items. And shown in the list adapter. I have tried to insertHeaderItem. But, when adding second item. Header is getting replaced by second item. I want to keep all item in the list. and update that list every time when i add new item. paingData .insertHeaderItem(item = sampleViewEvents.comment) .let { getCommentList.value = it...

Type mismatch: inferred type is Boolean but Parcelable? was expected Type mismatch: inferred type is Boolean but Parcelable? was expected val bundle = Bundle() bundle.putParcelable("Group_loan_Term_data",isValidProductType)

Can I use Navigate Compose whilst still Compiling for a Minimum SDK of 21? I'm having some trouble getting my app to compile whilst using Navigate-Compose, is it currently possible to produce apps for an SDK this low, or should I increase my minimum SDK?

How to fix "The project is not a Gradle-based project "? How to fix "The project is not a Gradle-based project " error while importing a project?

Parametrized data class with variance I have such class data class MyClass( val data: T? = null, val error: R? = null ) But actually I want my error to extend Throwable, for example. How should I declare MyClass for this purpose?

Unresolved reference :base I encountered the following error while running and could not find the cause