How the lazy declaration is working here? I am following a course named "Getting Data from the Internet" from the official android developers' website. It shows how to get data from a URL using Retrofit and Moshi library. They throw this code and I am not able to understand how the code inside object MarsApi{..} is working. Can anyone here explain this to me? private const val BASE_URL = "https://android-kotlin-fun-mars-server.appspot.com" private val moshi = Moshi.Builder() .add(KotlinJsonAdapterFactory()) .build() private...

Kotlin - IntelliJ cannot resolve the reference (from synthetic class) Problems Description: I am using Kotlin and I have the kotlinc compiler plugin (using arrow-meta library) in place which changes the .class by adding for example new properties or new method etc during kotlin compilation time. for example, the orginal source Kotlin A.kt is like below @MetaData data class A (val x: String, val y: String) after applying compiler plugin, the .class will be altered to (from source perspective), basically I will add implicitly MetaData into the primary...

Arraylist remains null even when data is being passed to it I'm working on a firebase chatting app. I want to maintain chats between two different users for this I'm creating a parent node as +923478302658@Chat and within it, a child node as +923478302658-+923065015216 within it messages for both participants. Here is my Chat Model: class AllChatsModel { var chatID: String? = null var chatStarterName: String? = null var chatRecieverName: String? = null var chatStartTD: String? = null var chatLastMessage: String? = null var...

How to draw circle on specific point of arc I created segmented circle like: I am able to draw segments 3 or even more but I do have problem with indicator on circle How can I draw white dot on segment like green? I would like to draw it on any angle. I am looking math operation to find exact point on my arc. My starting points are: var segmentSeparationAngle = 6f var segmentThickness = dp(5f) var sweepAngle = 180f val...

Function overload ambiguity for overloaded function-type inside a higher order function with generic input I have these two overloads for a higher order function: fun Response.onSuccess(predicate: (T) -> Unit) { val body = body() if (isSuccessful && body != null) { predicate(body) } } fun Response.onSuccess(predicate: () -> Unit) { if (isSuccessful) predicate() } The Response is the retrofit2.Response object which takes a generic type. I can call the first function as follows: response.onSuccess { result -> // not implemented } But the compiler gives a...

Best practices writing Espresso tests for a multi modular Android projects (MVI/MVVM) I am looking into Espresso Framework to adopt the best practices for writing tests for a multi modular Android projects (MVI/MVVM). Is it a good idea to cover/write all the Espresso tests inside the app module (or) it needs to be isolated specific to each modules? Is there any other best practices for MVI/MVVM based Android projects? if so, please comment and provide references if any Language used: Kotlin

How to delay hiding a transition image in android I am working on this task and I want to delay hiding this imageView until another view is loaded. So currently the problem is there is a split where it’s just displaying a dark screen as it waits for it to load which looks back. I tried using a handler but private fun animationFromPointA(): Boolean { val transImageView = findViewById(R.id.transition_image_view) val transImage = intent.getSerializableExtra(TRANSITION_IMAGE) if (transImage != null && transImage is...

Change BottomDrawer's gesturesEnabled according to drawerState in Jetpack Compose? I have an BottomDrawer but i want that when BottomDrawer is closed the gesturesEnabled should be false else if its open then gesturesEnabled should be true Here's code <a...

spring boot 2.6.2 with spring cloud not starting I am trying to get a spring boot application running that is the following build.gradle.kts: import org.jetbrains.kotlin.gradle.tasks.KotlinCompile plugins { id("org.springframework.boot") version "2.6.2" id("io.spring.dependency-management") version "1.0.11.RELEASE" kotlin("jvm") version "1.6.10" kotlin("plugin.spring") version "1.6.10" } group = "com.example." version = "0.0.1-SNAPSHOT" java.sourceCompatibility = JavaVersion.VERSION_11 repositories { mavenCentral() }...

spring-aop On apple silicon (M1) : Illegal method name My working project uses kotlin + spring-boot. I found this issue when I try to run a test case having space like should success WHEN setting key is api updatable on the MacBook apple-m1 machine. Example @Test @Transactional fun `should success when setting key is api updatable`() Then JVM throw Exception that contains stack trace looks like this Caused by: java.lang.ClassFormatError: Illegal method name "should success when setting key is api updatable" in class...

Geocoder returns wrong city name I need to get the name of the city of the current location in English using Geocoder (not necessarily with it. if there is another simple option, please write), but it gives out in transliteration. For example, I need "Saint-Petersburg", but I get "Sankt-Peterburg" or instead of "Moscow" I get "Moskva" Code: val aLocale = Locale.Builder().setLanguage("en").setRegion("US").setScript("Latn").build() val gcd = Geocoder(requireContext(), aLocale) var addresses: List? = null try {...

Android - TextView style specific words using strings files for 2 languages and set clicklistener on them In the strings files I have the keyword whatever for two languages for english it's: this is english, please continue if you want for german it's: das ist deutsch, fahrte fort wenn du willst I need to make the words english and deutsch in color blue with underline and set a clicklistener on them, same for continue and fahrte fort I'm aware of those answers for styling: <a href="https://stackoverflow.com/questions/20632908/android-color-specific-words-in-values-strings">Android: color...

How to return response entity when there's an error (but you don't know which one)? I'm working on a function that currently returns ResponseEntity.ok(...). So when the status code is not 200, it just shows nothing. I'm having trouble understanding how to condition the return of the function according to the status code. Because it can be anything, not specifically a 404 or something else. As in, if (not 200), return error, else return ResponseEntity.ok(...). Any tips? Thank you.

Wear OS: Downloading and executing watchface apk I'm new at android development and currently working with a Wear OS app that handles watchface buying and downloading. I would like to know if it's possible to download a watchface (either an apk or aab file I guess) directly from the watch and run it. So far I haven't found much information on how to do this and I am at a loss. I've been trying to start an intent with a url link and see what happens (I've been trying to get , but I am not entirely sure how would this work, so I guess it's...

Create a list os Kotlin with de result of a repeated function I have a very long method that creates a list with the result of a function that adds two numbers: private fun Add(one: Int, two:Int) : Int { return one + two } private val myList = listOf( Add(1, 2), Add(2, 3), Add(3, 4), Add(4, 5), Add(5, 6), Add(6, 7), Add(8, 9), ... ) Is there a way in kotlin to create this list without always repeating the name of the "add" function? I have tried with "with" and "apply" but I think I am not using it correctly. thanks in advanced

recyclerview not getting data from firebase to display data? Why RecyclerView in fragment is not showing any data from firebase backend? My RecyclerView with FirebaseRecyclerAdapter does not show anything on screen <a...

Kotlin property delegation not working as expected I'm confused about the different behaviour depending whether I use getters or delegated properties. Consider the following: class Test { class Parts(val a: String, val b: String) var raw = "" private var cachedParts: Parts? = null val parts: Parts get() { println("@2") return cachedParts ?: raw.split("/") .let { Parts(it.getOrElse(0) { "" }, it.getOrElse(1) { "" }) } .also { cachedParts =...

How do I check if a variable declared by Delegates.notNull&lt;Type&gt;() was Initialized in Kotlin? I want to programmatically check if a variable I declared using the by Delegates.notNull() has been declared in my code. val max = arr.maxOrNull() var num by Delegates.notNull() if (max != null) { if(max >= 0){ for(i in 1..max){ if (!arr.contains(i)){ num = i break } } if(!(this::num.isInitialized)) num = max + 1 //TODO: How do I check if num variable has been...

How to go from one page to another with SnapHelper? I'm using snap helper with a RecyclerView which is a slider with different cards in my case, to get the comportament of a viewpager. My problem is that I want to go from one card to another one(element by element) which it does but when I slide a little harder it just go to the last element. How can I make the slider just go from one card to another indifferently of how hard the usser slides. This is how I adapt my recycle view to my snap helper: val layoutManager =...

Сombine 3 LiveData into one with Paging 3 How can I combine 3 LiveData into one, I have a snippet in my project where I need to display the result of 3 different requests, into one RecyclerView, I read about it, and found out that it is possible to combine three LiveData into one, but I do not understand how this can be done using Paging 3. Sample code in my ViewModel: @HiltViewModel class SearchViewModel @Inject constructor( private val getAllCharacters: GetCharactersUseCase, private val getAllLocations: GetLocationsUseCase,...

How to make Fragments to be stateful in an Android Activity I'm a newbie in Android. I am trying to figure out how to create a stateful fragment based on MVVM with a SavedStateHandle injection. I have created an empty project in Android Studio based on a template with bottom navigation. Then I added a text input into DashboardFragment. I want the text of this input to be saved when user switches between tabs. At the moment I get access to VM as follows: private val application = activity?.application private val viewModel: DashboardViewModel by...

Second uploaded data replaces the first one in firebase realtime-database I'm working on a firebase chatting app. Chats between two users can be maintained in the parent node +923478302658@Chat and its child nodes like this +923478302658-+923065015216 which contains messages. The problem I encounter is that when the user sends the 1st message is sent successfully but when he sends the 2nd message it replaces the 1st message. Chat Model code var chatID: String? = null var chatStarterName: String? = null var chatRecieverName: String? = null var...

Install Kotlin on ubuntu 21.04 Desktop(arm64) i have a raspberry pi 4 with ubuntu 21.04 Desktop and i want to install kotlin (I don't want to use snap). Can anyone tell me how to do it? Thanks.

inject workmanager through koin Android Hey I am using Koin in my application. I am trying to inject workmanager in my application according to this answer. I did this successfully but I have little bit confused about workManagerFactory() Module.kt val workerModule = module { // worker definition worker { SimpleWorker(get(), get(), get()) } } so when startKoin startKoin {...

Jetpack Compose Build Issue I keep getting this error while trying to build the project. I have tried all of the other solutions which I found on stackoverflow regarding similar issue with Jetpack compose. Have anyone been able to build succussfully as of Jan 10, 2022. Thank You! Could not resolve all files for configuration 'appkotlin-extension'. Could not find androidx.composecompose compiler1.0.5. Searched in the following locations: buildFeatures { compose = true }...

Android 12 - media notification disappearing I've been experiencing some odd behavior on Android 12. Specifically with a MediaBrowserService. The app will play sounds in the background for extended periods of time. I am running into two distinct but unwanted behaviors on Android 12. On a pixel 5a - the notification appears, but will disappear after an hour or so in the background. The music is still playing fine and can be paused if the app is opened up. On a Samsung s21 - the notification appears when the sound plays. but if it is...

Chaging Views' position in android I'm trying to build a simple app where there's a button and each time it gets clicked it changes its location on the screen. I don't have any experience at all developing for android so I don't know how to change Views' properties etc.

Java/Kotlin way to redirect command output to both stdout and String I am translating code from a NodeJS server to a Kotlin Ktor server. The NodeJS code splits the output between a String to be handled by code, and realtime server logging : const shellScript = exec("./myScript.sh", (error, stdout, stderr) => { // this happens when the script ends // stdout and stderr contain full script output if (error === null) { ... } }); // Realtime server logging shellScript.stdout.on('data', (data) => { console.log(data); });...

Issue in adding new value in ArrayList at 0th position I have ArrayList of my model/pojo class. Which has below values which I am getting in my logcat : BatteryDetailsHistory(dates=10 01 2022, dateNumber=10, chargeOverTime=94, avgTemperature=21.9385, averageChargeDischarge=-2.1234) Now, here at specific situation I have to add one value of the object BatteryDetailsHistory at 0th position in the arraylist of this model/pojo. So, I have done it as below : var objNew = list[0] objNew.averageChargeDischarge = "0" list.add(0, objNew) But after that...

Not able to change app language in Android 7 (API 24) I know this question has been asked before. But I've tried all those ways but my app language simple won't change language in Android 7 (works well in versions above Android 7) Here's my code override fun attachBaseContext(newBase: Context?) { var context = newBase val resources = context?.resources var localeToSwitchTo = Locale(userLanguage) val configuration = resources?.configuration if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {...