Cannot use list in lazycolumn in kotlin I am using LazyColumn in project. When I am passing the list it giving me error. Can someone guide me what is the error? ResultScreen.kt @Composable fun ResultScreen(nearestResultList: List?) { LazyColumn( Modifier .fillMaxSize() .background(getBackgroundColor()) ) {...

Kotlin - What is the easiest way to create a generic data object to transform into JSON for API requests? It is very easy to create native generic objects that can be serialized into JSON in dynamically typed languages like Python, PHP, or JS. With Kotlin, it seems like I will need to define a serializable data class, at the very least, in order to be able to compose JSON for transmission. This is workable, but it breaks down pretty quickly when the data is complex or variable, and because of this is not very reusable. Is there a good approach (using Kotlin) that allows for similar behavior to...

Backhandler not working in jetpack compose Hey I am using BackHandler from this stackoverflow. When I am pressing back button it's not working. Can someone guide me on this. ResultScreen.kt @Composable fun ResultScreen(navController: NavHostController, nearestResultList: List?) { SportsResultTheme {...

How to implement Banner Ad in RecyclerView Kotlin? The app closes when i try to start the activity where the banner ad is, and i receive the error "lateinit property mAdView has not been initialized" This is my Adapter class ComoSeJuegaAdapter (private val context: Context, private val dataset: List): RecyclerView.Adapter(){ class ComoSeJuegaViewHolder(val view: View): RecyclerView.ViewHolder(view) { val textView: TextView = view.findViewById(R.id.item_title_como_se_juega) val imageView: ImageView =...

Console input is interupted by output I have a Kotlin console application with a lot of log messages. For testing, I want to enter certain admin commands in the console. However, each log message apparently erases my console input buffer. How can I reliably read a line or even just individual chars from the console, while other threads are printing log messages to that console? fun main() { thread(isDaemon=false, name = "ConsoleThread") { while(true) { println("(doit) do something")...

Convert this java array to a kotlin equivalent array 2d Hi I'm trying to convert this java array to a kotlin array: String[][] data = {{"May","22"}, {"June","45"}}; I tried two ways but my tableView is not showing any record. This is my way number 1: val mayo: Array = arrayOf("Mayo", "20") val junio: Array = arrayOf("Junio", "40") val data2d1 = arrayOf(mayo, junio) The I pased this array to the adapter of this library: <a href="https://github.com/ISchwarz23/SortableTableView" rel="nofollow...

Write a kotlin program that prints the number that is repeated the most in a consecutive way I'm kind of stuck, I don't know how to make the second loop to start 1 position above the first loop in Kotlin. I have an array (named myArray) with 10 elements, I need to Write a Kotlin program that prints the number that has the most consecutive repeated number in the array and also prints the number of times it appears in the sequence. The program must parse the array from left to right so that if two numbers meet the condition, the one that appears first from left to right will be...

Can't find constructors of Kotlin class class Foo(context: Context) { ... } class Bar(context: Context): Foo(context) { ... } When I try to construct a Bar like: Bar::class.java.getConstructor(Context::class.java).newInstance(context) I get NoSuchMethodError. If I look at Bar::class.java.constructors the result is empty. What am I missing?

How to use the new ComponentActivity with ViewBinding and the other old AppCompatActivity components According to this question, I tried to update my deprecated menus codes like setHasOptionsMenu , onCreateOptionsMenu and onOptionsItemSelected in my fragments and all app, but I should replace AppCompatActivity to ComponentActivity(R.layout.activity_example) but after doing this I see there's some problem, first I confused about how to use ViewBinding with it when I should remove setContentView(binding.root) from activity second the...

Hilt java.lang.IllegalStateException: Unsupported metadata version. Check that your Kotlin version is &gt;= 1.0 I'm facing issue while adding hilt dependencies in my project plugins plugins { id 'com.android.application' id 'org.jetbrains.kotlin.android' id 'kotlin-kapt' id 'realm-android' id 'androidx.navigation.safeargs.kotlin' id 'kotlin-parcelize' } dependencies //Dependency injection with Hilt implementation("com.google.dagger:hilt-android:2.38.1") kapt("com.google.dagger:hilt-android-compiler:2.38.1") implementation 'androidx.core:core-ktx:1.8.0' implementation...

Why onBackPressed() is not fired when touching Back-Button / Android In order to reproduce my issue I made a tiny project. It has two activities. Here is the MainActivity.kt file: package me.soft.trybackbtnaction import android.content.Intent import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.view.View class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) } fun...

Ktor | How to connect FreeMaker-Template with a CSS-File? I just started learing Kotlin and Ktor for Web Development. I started creating a Template and everything worked perfectly but now I want to add style to my Templates. In the Kotlin Docs they add style with HTML but I would like to add style with a CSS-File. Is that possible? NK

convert biginteger to bit I am stuck with an exercise at JetBrain Academy, with BigInteger(Kotlin). I should write a code snippet to convert a (BigInteger) number of exbibyte into bits: if the input is 1 as BigInteger, it displays 9223372036854775808. In the hints it says I should use pow(63).(Exbibyte = 2^63 = 9 223 372 036 854 775 808‬ Bit) My problem is if I use pow(), I can use only double as the biggest range. But with double I cannot display a BigInteger number.

Checking if finger is over certain view not working in Android I am working on a paint app with the following layout: For the paint app, I detect touch events on the Canvas using onTouchEvent. I have one problem, I want to also detect touch events in which the user begins the swipe on the root and then hovers over the Canvas. To achieve this, I added the following code: binding.root.setOnTouchListener { _, motionEvent -> val hitRect = Rect()...

What is the best way to play an alarm ringtone when broadcast reciever is called? I am having trouble finding the best way to activate an alarm tone. My broadcast receiver is called, the media player starts, but then stops. after about a second when my alarm app is closed and not open in recent apps. It will play continuously if the alarm app is open. Does anyone know the best way to play a sound once a alarm broadcast receiver goes off? what I am currently using in the broadcast receiver. val mediaPlayer1 = MediaPlayer.create(context2, R.raw.geese)...

How to add kotlinc to macOS PATH ENVIRONMENT from my Android Studio JetBrains Toolbox App plugin? I want to use kotlinc to compile Kotlin file to JVM ByteClass and got a response: zsh: command not found: kotlinc I know I can install it using homebrew. But, I already have Android Studio installed using JetBrains Toolbox App and I want to avoid having two copies of Kotlin. Anybody know how to add my Kotlin plugin into my PATH ENVIRONMENT? so I can use kotlinc in my terminal. I'm using macOS. Thank you for your help

Convert Comparable&lt;*&gt; but get error inferred type is Any? but Nothing was expected I am trying to convert this piece of java code to kotlin public int compare1(Comparable c, Object o) { return c.compareTo(o); } to kotlin code: fun compare1(c: Comparable, o: Any?): Int { return c.compareTo(o) } But get error Type mismatch: inferred type is Any? but Nothing was expected Any reason why this error occurs? Thanks

Unit testing Androoid Mockk argument capture interface SomeAPIHandler { fun getUserContent(apiInterface: APIInterface) } interface APIInterface { fun onSuccess(responseModel: T) fun onError(errorModel: ErrorModel) } In my presenter class, it is called like: apiClient.getUserContent(object : APIInterface { override fun onSuccess(responseModel: UserModel) = handleSuccess(responseModel) override fun onError(errorModel: ErrorModel) = handleGetUserModelError() }) I am getting code coverage issue from...

How to check whether my app following S.O.L.I.D. Principle I have created one app in kotlin, I tried to follow all OOPS and SOLID principles in my app. But after development of whole app i want to check whether any class is missing or breaking rules of SOLID principle. Try 1 Review the whole code in each class whether they are following SOLID principles of not. But if i have large number of files then it will take more time. How can we do it automatically to check whether my app is following SOLID principles.

Android Studio Kotlin how to send layout to a fragment? I am new about fragment stuffs.I have MainActivity in my app module and it has a fragment.And also I have features->List module and inside that module I have list layout and other layouts(cardviews) which will display on list layout as recyclerview.Once I haven't any fragment stuff.I was displaying my recyclerview on my MainActivity.Now I want to have a fragment in my Main Activity and content of the list.xml will be in the activitymain.xml and when MainActivity initiliaze it should...

How can I find the color color created with bitmask? how can I find the color color created with bitmask? For example, what is the color equivalent of this expression? color = -16777216

Kotlin compiler reports unused expression in constructor for builder taking vararg lambdas We have a relatively simple builder pattern we use for test data generator in Kotlin. The builders follow the pattern: class ThingBuilder private constructor( var param1: Int = 1, var param2: Boolean = true ) { private constructor(vararg inits: ThingBuilder.(ThingBuilder) -> Unit) : this() { inits.forEach { it(this) } } fun build(): Thing { return Thing( param1, param2 ) } companion object { fun...

Quastion aboud FloatingActionButton (diamond) I trying to make FAB with diamond shape. A lot of articles is saying the same: Ok, let's go to my code: And the result is: Whats wrong with this FAB ? Why it is circle instead of diamond shape ? It should be diamond, like examples in all articles all over...

Response header has duplicated values I have two simple microservices through which the download file flows, but for some unknown reason some header values are duplicated. First service where is Response build: @POST @Path(PRINT_PREVIEW) fun print(@Valid printRequest: PrintRequest): Response { // printPreview is Pair val printPreview = printService.printPreview(printRequest) return Response.ok(printPreview.second) .header("Content-Disposition", "attachment; filename=${printPreview.first}")...

How to change the value of state object without using _? In my app I perform a request to an API that should return a boolean. Inside the ViewModel class I have these 2 objects: private val _isAvailableState = mutableStateOf(Success(false)) val isAvailableState: State = _isAvailableState One is mutable and the other one isn't. Here is how I read the value: fun checkAvailability() = viewModelScope.launch { repository.checkAvailability().collect { response -> _isAvailableState.value = response } } Is there any way in which I can...

How to run Channel first tflite model in Android I am able to run my custom tflite model in android but the output is totally wrong. I suspect it is due to my model needs input shape [1, 3, 640, 640] but the code makes channel last ByteBuffer. I have created tensor buffer like this TensorBuffer.createFixedSize(intArrayOf(1, 3, 640, 640), DataType.FLOAT32) but I still suspect inside the for loop, the channel is not properly set in the flat input (ByteBuffer). I have copied this code from example where the required model shape was [1,32,32,3]...

Should you use Delegates.observerable() or SharedFlows for custom events? I'm working with ble devices on Android and want to implement custom events. I have the functionalities I need already in C# with Xamarin, so I'm just translating the code most of the time. In C#, I would use delegate and event for custom events, Kotlin offers the Delegates.observerable() functionality. I tested it with the following code and it looks like it works suspiciously flawlessly: var peripheralFound: MyBlePeripheral by Delegates.observable(MyBlePeripheralImpl()){ _, _,...

Converting java to kotlin -- streams I am learning Kotlin, and not know it properly. I have a piece of code in Java: private static Signature[] createSignatures(String... encodedSignatures) { return Arrays.stream(encodedSignatures) .map(encodedSignature -> new Signature(Base64.decode(encodedSignature, Base64.DEFAULT))) .toArray(Signature[]::new); } I want to convert it to Kotlin, and I have reached till here: private static Signature[] createSignatures(String... encodedSignatures) { return...

compile error: Supertypes of the following classes cannot be resolved I have a gradle project with proto3 generator: buildscript { repositories { mavenCentral() } dependencies { classpath("com.google.protobuf😛rotobuf-gradle-plugin:0.8.14") } } ... dependencies { ... implementation("com.google.protobuf😛rotobuf-java:$protoBufCoreVersion") } protobuf { protoc { artifact = "com.google.protobuf😛rotoc:$protoBufCoreVersion" } } Also, I have config for adding generated source code to classpath:...