Kotlin Contracts not working for null-check in extension function I'm trying to write an extension function that returns true if the value is not null or 0 and use a contract to guarantee to the compiler that if I return true, the value is non-null. However, it doesn't seem to be working with smart casting. It still won't compile when I try to pass the value into a function that takes a non-nullable Long. I tried to compile this code and it would not work. I expected the id to be smart-casted to a Long from a Long? since the contract guarantees that if...

RecyclerView (with Adapter) doesnt show my items I am using RecyclerView to show my items. But when i save an item, recyclerView doesnt show it. I am saving my items with a custom dialog. So the saving happens in the same fragment with my recycler view's fragment. When i save item, first i dont get any error but recyclerView doesnt show any items. But when i navigate to another fragment and navigate back, recyclerView doesnt show anything again and this time i am getting this error; java.lang.NullPointerException: Attempt to invoke virtual...

I have Flutter assets downloaded as Deferred Components. How do I access them via the AssetPackManager in Kotlin? I have assets I'm downloading into my Flutter app. The pubspec.yaml includes: deferred-components: - name: arBlock11 assets: - assets/unity/ch1/1/ - assets/unity/ch1/2/ - assets/unity/ch1/3/ I am trying to get the paths to these files in Kotlin (outside of Flutter) using: val assetPackPath = assetPackManager!!.getPackLocation("arBlock11") The assetPackManager exists and I'm 100% sure the Deferred Component has downloaded. But I assetPackPath above is...

Getting error when run KMM project for IOS app after add io ktor dependency I am trying to build KMM project following kotlinlang.org/docs Getting error when run KMM project for IOS app after add io.ktorktor client core2.2.2 dependency It is working fine without io.ktor dependencies, but its failed with io ktor Command PhaseScriptExecution failed with a nonzero exit code My Gradle verions: 7.5 How I can solve this issue?

How do I make a post in xml using a serial number and api key and receive back json? I am using an existing API that requires a POST in XML. That XML will contain an API key and a serial number and the response will be in JSON. I am using Android Studio and Kotlin to write the app. I am also trying to use Retrofit2. My problem is that I can not find how to use both XML and JSON. I know this code is incomplete but I would be interested in a good source of information on these topics. If you have any good lessons please share. This is my Interface package com.example.project...

Klint Maven CLI does not report file names during failure When a failure occurs in my maven build due to a klint violation, the report displays the line number but not the file name. The error message is as follows: Failed to execute goal com.github.gantsign.mavenktlint maven plugin1.15.2:format (default-cli) on project foo-project: Execution default-cli of goal com.github.gantsign.mavenktlint maven plugin1.15.2:format failed: 89:33 Unexpected tokens (use ';' to separate expressions on the same line) -> [Help 1] [ERROR] I have read through the...

Configure set of parameters for a Junit5 parameters I have a gradle project using Kotlin and JUnit5 if it helps. Currently I have a bunch of parametrized tests to run using @MethodSource. A tests with all parameters runs for a quite long time, and during local development itn's enough to run lesser with just one value. Is it possible to define a switch or a configuration to run all tests, but with limited numbers of parameters? Solutions tested, which didn't work: Edit source method(s) everytime I need to run locally -> this leads to mistakes...

How to create a custom navigation drawer selected item background in Android Studio? I'm trying to achieve something similar to this image, where the selected navigation drawer item has a rounded rectangular background, but I can't seem to find the code that does this. This is from Android Studio's pre-made "Navigation Drawer" Activity. For reference, here's what the default drawer selected item background looks like. I...

Kotlin Testing Coroutines with kotlin-test I have something of the following where I'm trying to test a class launches a coroutine and that coroutine does something properly in the thread. However I think don't have the right understanding on how context/dispatchers and scope work so this isn't working as expected. class Janitor ( private val sharedMap: MutableMap, private val delayMs: Long, private val dispatcher: CoroutineDispatcher = newSingleThreadContext("JanitorThread"), ) { private val janitorScope =...

How to test concurrency related issues with kotlin courtines I am debugging an issue that involves doing two tasks concurrently: suspend fun method1() = withContext(Dispatchers.IO) { dao.getAllLogsAndClearDataBase() } private val coroutineScope = CoroutineScope(Dispatchers.IO) fun method2(log: Log) { coroutineScope.launch { dao.insertLog(log) } } Both use Dispatchers.IO and I have crashes in Crashlytics showing that we're inside of method1's getAllLogsAndClearDataBase and also...

JPA Inheritance annotations with Kotlin I'm trying to make a Notification system. Currently my model consists of a Notification which has a NotificationType and NotifiableObject. A NotifiableObject can be something like an invitation to join a team, which would have specific actions for that type of notifiable objects (which is handled by the frontend). My idea was to create a table for the notifications, and a table per type of notifiable object. Then I would use some sort of strategy/factory pattern to use the notification type...

MediaProjection generates images with transparent pixels I'm trying to implement screen capture with MediaProjection API using this repo as a reference project. I've tried to run this project on Cuttlefish (Android 13), Samsung A51 (Android 12) and Xiaomi Mi 9 (Android 12), and result is the same — it works, but generates images with transparent pixels on the sides (not sure if it's visible on the screenshots): <a href=""...

How do i declare a 2D Array in Kotlin. Without initialise the array with value's Anybody know a short and easy way ? I found a function that work's good but still got value's. var tilemap = Array(sizeX,{IntArray(sizeY,{-1})})

Overflow alignment in innerTextField in kotlin jetpack compose? I have a similar search bar I pulled out from this other stackoverflow question. I, however changed lots of it and ended up with a much simpler SearchTextField composable. @Composable fun SearchTextField( text: String, placeholder: String, modifier: Modifier = Modifier, onTextChange: (String) -> Unit = { }, onIconClick: () -> Unit = { }, onFocusChange: (Boolean) ->...

Necesito AYUDAAA! no logro solucionar el error. FLAG_IMMUTABLE, only use FLAG_MUTABLE if some functionality depends on the PendingIntent No soy desarrollador y he comprado un codigo de fuente para una app de radio online y no logro solucionar el error al cambiar el api a 31. Despues de aumentar a api 31 sale el error, ya puse el android.exported:true en manifest. tambien he agredado implementation('androidx.workwork runtime2.7.1') en build.gradle

Spring RestTemplate with HttpClient Client Certificate on Windows How can I include client certificate using latest HttpClient (httpclient5) in Windows? I'm using latest RestTemplate (rest framework 6.0.4) with HttpClient. It throws exception when I create an in-mem keystore (same result with "PKCS12" and "JKS") with just my certificate 500 Internal Server Error: "{"ErrorCode":"APPAP330E","ErrorMsg":"Failed to verify application authentication data: Could not obtain client certificate details."}" val x509 : X509Certificate =...

Get the value from VisualTransformation Jetpack Compose TextField How can I get the transformed value from VisualTransformation in Jetpack compose TextField? since the only thing that is changing is the visual text not the actual input/buffered text? class CurrencyAmountInputVisualTransformation( private val currencySymbol: String, private val unbufferedValueChange: (String) -> Unit ) : VisualTransformation { private val symbols = DecimalFormat().decimalFormatSymbols private val numberOfDecimals: Int = 2 override fun filter(text:...

implement inequality symbols for a custom class in kotlin I have this class: class Dog(private val name: T, private val weight: T): Comparable { override fun compareTo(other: Dog): Int { TODO("Not yet implemented") } override fun equals(other: Any?): Boolean { return (other is Dog) && (other.weight == weight) } } and I want to compare any two dogs based on their weights, not names like this: fun main() { val dog1 = Dog("Dog1", 10) val dog2 = Dog("Dog2", 11) println(dog1 > dog2) println(dog1

This.var in kotlin Hi, firstly I am sorry about the bed title because I don't find a good one. I watched a video about "How to make a clean architecture Note App (MVVM / CRUD / Jetpack Compose)". so he writes a code that I don't like so much and I think there is a better way to write it (to more detail watch from <a...

How to Capture/handle Deep links in kotlin android webview app? I'm trying to handle an external url via my app, this is my xml deeplink code,...

How can I send data to an already connected bluetooth device? I'm connecting to a bluetooth device from settings. And now i want to send data to the device from my android app. Earlier I created a Bluetooth connector to connect. But now I have to choose a new path, if I'm not mistaken.

Using Kotlin Duration with Java Time fluently What is purpose of Kotlin Duration when it isn't fluently compatible with java.time clasees? When I need always use converter... Why aren't implements extenstion function over java classes which should intercept Kotlin Duration? Are there some fluent ways to use Kotlin Duration with java.time? NOTE: example not so good, in this case I can use plusDays... but I hope that ilustrate inflating of expresion

How to display suggestions for AutocompleteTextView and onItemClick display that item in a recyclerview with more information about the item i'm creating a POS system where i'm trying to display items name in a suggestion list under the autocompletetextview and i was able to create it, But when it came to the onItemClick i hit a wall i couldn' t display the item in a recyclerview. i did my research but couldn't find how to get these info from the database and display them and i had a hard time trying to figure out if it's a problem from the Adapter or i wrote my code wrong. so can anyone help me ? this is what i tried this is the...

Why does Hilt @Bind construct a class multiple times? And what is the best practice way of listening to network in a repository? The Questions: Could you please suggest a best practice way of getting network connectivity status in a repository that needs to determine from where to fetch data. My min Api is 23. Why does Hilt construct the class multiple times even if it's supposed to be installed in SingletonComponent? I have borrowed from a Medium article and built a NetworkStatusManager. It is injected into my DetailsRepository with Hilt through @Binds. This NetworkStatusManager emits a flow when network becomes...

Unable to insert data to Room database I am trying to insert values to room database but it's not working, I checked the database, and the tables were not created. I have created the database, DAO and Repository in java and calling the insert dao inside a coroutine in MainActivity Kotlin class. DAO @Insert public void addExpense(List exp); Repository public class Repository { private ExpensesDao expensesDao; private SubscriptionsDao subscriptionsDao; private static AppDatabase db; public Repository(Context...

Delegate a job to a channelFLow I'm trying to recreate this function using LiveData to a function doing the same but with channelFlow; Always set isLoading is boring to me. Rewrite a try finally everytime too. LiveData way : private val _isLoading: MutableLiveData = MutableLiveData(false) val isLoading: LiveData = _isLoading protected fun process(job: () -> Job) { if (isLoading.value == true) return _isLoading.value = true viewModelScope.launch(Default) { try {...

Github Action Runner With Kotlin Gradle Fail I am trying to use a github action runner to run a test in my Kotlin project. It's part of a gradle springboot project (a simple API microservice). That said, the test is just a standalone 'hello world' type unit test which lives in it's own module and of course has no problems when run locally (I'm using a custom gradle task to run it)! Here is my workflow yaml file - name: Kotlin CI on: [push] jobs: build: runs-on: self-hosted steps: - uses: actions/checkout@v2 -...

Image doesn't load using glide I am using glide for image loading but I don't know what's problem with my glide I add image for reference. ➡️ Glide Error I am trying to fetch images from url. My Code :- Glide.with(context) .load(path) .error(R.drawable.ic_launcher_background) .diskCacheStrategy(DiskCacheStrategy.AUTOMATIC) .into(imageView)

Smart Searching System for Video Database (Android App) I want to implement a searcher in the app. When the user searches for the video stored in the local phone database using the search bar, suggestion will be popping up to aid in their search. And to generate the relevant filters for each video, I’m thinking of using tensorflow lite to process each video in the database automatically (object detection, human activity recognition, audio recognition), and generate tags to store in the database. And from the database, it’ll be used for the...

Micronaut @SerdeImport annotation not working with Kotlin I am working on developing an application using Micronaut framework with Kotlin language. However, I am facing issue where @SerdeImport annotation is not being recognized when using Micronaut with Kotlin. I am getting below error even after using the @SerdeImport annotation. `No serializable introspection present for type MarketSnapshot B. Consider adding Serdeable. Serializable annotate to type MarketSnapshot B. Alternatively if you are not in control of the project's source code, you can...