Views sizes inside Constrainlayout not working properly I'm confused why this is not working properly knowing that it will work 100% in Java + XML, now that I'm trying to learn Kotlin + Data Binding i get this problem. The views not taking full screen space in width and act like wrap_contant. What i tried: -Only one textview in the item with match_parent in width -Linearlayout as parent with match_parent in width -Constrainlayout as parent with match_parent in width -Constrainlayout as parent with 0dp in in width, display nothing... you see only...

How to make higher order functions synchronous kotlin? I am trying to run a test in which I want to wait till higher order function executes. As of now I am not able to figure out any ways to do it. Following is my code. @Test fun `test execute routine error`() = runBlocking(coroutineDispatcher) { val observer = mock() baseViewModel.error.observeForever(observer) val httpException = HttpException(Response.error(402, mock(ResponseBody::class.java))) val function = baseViewModel.executeRoutine { throw...

MediaPlayer.Pause() Method not Pause audio Hlw developers I want some help about Media player. when i start my Media player with media player.start() after that i want to pause my audio but mediaplayer.pause() igonerd by the android. I dnt know Why? Please Help if any one Knows solution this is my Init method of media player private fun reinitMusic() { val musicData = application.getMusicData() mPlayer = MediaPlayer.create(this@Finilize_Activity, Uri.parse(musicData.track_data))...

Kotlin: declare a list or map generic over sealed class I have a sealed class sealed class Animal { data class Cat(val asd: String) : Animal() object Dog : Animal() } I want to declare a map with Animals as values val myMap = mutableMapOf() but when I try to put a Cat in it, the compiler tells me that it expects Animal but gets an Animal.Cat I tried to declare it using generics val myMap = mutableMapOf() but it doesn't work. What do I do Basically sealed classes break the Liskov Substitution Rule so I am almost sure this can't / shouldn't be...

web page not available in android webview I created a simple webview : MainActivity.java : package com.example.browser; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.webkit.WebView; public class MainActivity extends AppCompatActivity { WebView web; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); web=findViewById(R.id.web);...

Test for suspend function making HTTP GET call fails I am working on implementing a unit test case for my suspend function. This function makes an async call to an HTTP GET URL as seen below. Currently, the test case that I have written is failing with the error message as described below. Actual implementation code DispatcherProvider.kt interface DispatcherProvider { fun main(): CoroutineDispatcher = Dispatchers.Main fun default(): CoroutineDispatcher = Dispatchers.Default fun io(): CoroutineDispatcher = Dispatchers.IO fun unconfined():...

How to make BroadcastReceiver Recursively at every 1 second in android I want to make BroadcastReceiver Recursively at every 1 second, it means when I get in onReceive override methode, after all the fun called at last I want to Broadcase this BroadcastReceiver of class again, like that I want to call every 1 second, I tried Handler but not worked, so plz Help me out from this.

Kotlin top level function not visible when used from other Maven project The following code works from within the same project: import org.slf4j.Logger import org.slf4j.LoggerFactory val Any.log: Logger get() = LoggerFactory.getLogger(this.javaClass) Example usage: log.info("hi!") When I try it from another project I get a compilation error: Cannot access 'log': it is internal in 'com.mycompany' Why is this happening and how can I make it work?

Look this "startActivityForResult()" codes, this function was deprecated. How to change this codes in Fragment? Look this startActivityForResult() codes, this function was deprecated. How to change this codes in Fragment? What's mean "Call Activity.startActivityForResult(Intent, int) from the fragment's containing Activity."?? Please, simply guide to me... private const val REQUEST_PHOTO = 2 class ExampleFragment:Fragment(), DatePickerFragment.Callbacks { private lateinit var photoUri : Uri override fun onStart() { super.onStart() ... photoButton.apply {...

How to provide an unfrozen or isolated swift implementation of a kotlin interface to Kotlin Native code I am trying to create a multiplatform library, which requires some platform / app specific dependencies to function properly. As a solution I thought to define interfaces in kotlin code, and have the host app implement these interfaces and providing them to the library when using the library. This library will do certain things on other threads using coroutines multithreaded, and it will need to use these dependencies from those threads. This is where the memory model of kotlin native comes...

What are the differences between StateFlow and LiveData? as I mentioned in the title, I'm curious about the general differences between the two. Can you help with this? I couldn't find the specific differences as there are complex examples on the internet. What are the differences in terms of performance? In which scenarios does it provide advantages? Does it make sense to use it in a project that doesn't use Kotlin Flow? Want to remove Google Livedata? :)

Kotlin - retrieve data from HashMap of Key Value pairs How do I retrieve the price (649) from this? Currently I have this but I want to reach the value directly for (product in snapshot.children) { if (product.key.equals("price")) { price = Integer.parseInt(product.value as String) } }

ContentResolver gives me wrong content uri Context : In my app I use the ContentResolver to get images from content uri : contentResolver?.query(mediaStoreUri, projection, null, null, null)?.use { // Some stuff } Issue : The issue is that sometimes, the query gives me some invalid results : I get uri path, size, name...etc, but when I want to call these Uris, through Glide in my case, I get an error like "File not found". These case is very rare but possible, so I search how to solve it. For information, in the Google's file...

Kotest nested tests & Mockk in Spring WebMvcTest randomly failing with MockKException: no answer found I've tried searching anything similar and tried various solutions to no avail. I have some nested tests which are failing with MockKException: no answer found, even though threads should not be touching mocks under use in another test, as I've annotated the class with @Isolate. Here is my class structure: Superclass for all MVC tests: @Isolate @WebMvcTest @ContextConfiguration( classes = [ HelloController::class, WebSecurityConfig::class, TestApplication::class,...

unable to view file inside the app android My app downloads three types from server (pdf, jpg, png) and saves in the app. After saving I want to open the file in app. The file is successfully getting saved in the app package, but on opening the file in phone. I get the error 'the file cannot be accessed', check your connection or make the file name shorter'. And in emulator it opens up a new black screen and returns back to the previous screen. I don't know if the issue is with phone or code. Kindly guide in right direction val...

Why do i have to create runBlocking in Kotlin after importing coroutines import kotlinx.coroutines.* fun log (msg : String ) = println("[${Thread.currentThread().name}] $msg") fun main() = runBlocking { val a = async { log("I'm computing a piece of the answer") 6 } val b = aysnc { log("I'm computing another piece of the answer") 7 } log("The answer is ${a.await() * b.await()}") } this is my code. I'm trying to study coroutines using Kotlin. But runblocking, asyn, await are on Redline. How can i fix it? I...

BiometricPrompt with Jetpack Compose BiometricPrompt requires either Fragment or FragmentActivity in its constructor. I cannot find out how to use BiometricPrompt from a Composable screen, not in the documentation, not in any tutorial. Has anyone in here dealt with the same problem? Or is there any other way to use biometric authentication in a fully Compose built application?

Looking for a library for editing existing Kotlin code I'm looking for a library that would allow me to modify existing Koltin code. Let's say I have a class: class A { val b = B() fun x(): B { return B() } } I would like to be able to automatically transform it into: class A { val b = getB(this) fun x(): B { return getB(this) } } I know about Kotlin Poet, however in seems to only allow generating code from scratch, but not modifying existing sources.

How does comparreValuesBy() work in kotlin? Here's the declaration from the kotlinlang.org: fun compareValuesBy( a: T, b: T, vararg selectors: (T) -> Comparable? ): Int Comparable is an interface, how can you return an interface? What does the spread operator * do in Comparable? In the example demonstrating the function: fun compareLengthThenString(a: String, b: String): Int = compareValuesBy(a, b, { it.length }, { it }) What does 'it' refer to? a or b? Thank you for reading.

Changing Extended Floating Button to normal size when scrolling Good Afternoon, I have been trying to add my extended floating button to change to a normal floating button when scrolling but nothing happen and it stays extended and im not sure when: my orderdetail (Where I call the extension): recyclerView.addOnScrollListener(FabExtendingOnScrollListener(extended_fab)) where it should do extend or squish: class FabExtendingOnScrollListener( private val floatingActionButton: ExtendedFloatingActionButton ) :...

Force Edit text to remove focus after submitting list in recyclerview I have a recycler view which have multiple edit text. On adding items to recyclerview, focus always shift towards the first editText of screen. I have already used android:focusable="true" and android:focusableInTouchMode="true" with parent layout of edit text. Below is my XML Code for the fragment: This is how I am submitting items to my list of RecyclerView: private fun submitSearchResult(it:...

How to Stub on Spy Object’s suspend method? I got the idea how to stub suspend functions of regular mock object and also how to stub regular method of spy object. However, I did not find a way to stub the suspend function of spy objects. For e.g: If I do whenever(method).thenReturn() gives me null exception since I pass any() as parameters.I did not find a way to call doReturn().when(suspendFunction()) For the suspend methods in spy object. Any help will be appreciated. Thanks.

Low quality of xml preview in android studio Hi i was design my layout i see my layout has low quality how i can resolve it?

How to set the height equal to its width? I would like to make a board game like chess (8x8 cell board). As the goal, I hope my application runs on several smartphones like screen dots (= 720px X 1280px, 1024px X 1920px, 1024 X 2340px). The attached photo is my game board, and make the height equal to its width by input px value. In this result, 1024px X 1920px and 1024 X 2340px are OK. Of cource, not for 720px X 1280px smartphones. Could you give me your technics to control TableLayout's height equal to its width ? <a...

LastLocation not updating on first time I am making a simple weather app and I want to use the last location. When I am trying to change location on the emulator and press the refresh button on my app, it does not update location, even on logs location is previous, bet when I press again refresh button, it gives me location. So basically, when on the emulator I set location A, press refresh. It still shows location A. Then I change on the emulator to location B, press refresh, it is still location A, then again on refresh, and then...

Composable doesn't recompose although LiveData changes I simply want to add a Node to a List when the user clicks a button and display it in a composable LazyColumn. Here is how I thought it would work: VieModel: private val _nodeList: MutableLiveData = MutableLiveData() val nodeList: LiveData = _nodeList fun onNodeListChange(newNode: Node){ _nodeList.value?.add(newNode) } and in my Composable I try to observe it by calling: val vm = getViewModel() val nodeList: List by vm.nodeList.observeAsState(listOf()) In the onClick of...

Navigation Component - Starting destination is incorrect I started noticing something in my app the other day and its wildly inconsistent. Sometimes it happens and sometimes it doesn't. I am using the Navigation Component to handle navigation in the app and I started noticing that sometimes, when popping the backstack via the action bar back button or the device back button, it returns to a fragment that is no longer the starting destination (or at least shouldn't be). In my case the app starts in MainFragment and once authenticated moves to...

Parameterized interfaces in Kotlin I'm building a Kotlin microservice that processes events of various types and publishes them out to external partner systems. I have all of the event classes implementing a common interface called GenericPartnerEvent: interface GenericPartnerEvent data class EventTypeOne( val key: String, val payload: String ) : GenericPartnerEvent I then have a series of event handler classes, one per external partner, that are defined like this: interface PartnerEventHandler { fun...

How to test config file property ? - Kotlin + Spring boot + Junit5 I would like to create a new test with a property file, however on running, variables are always setting to null (only on test of course). There is an issue with kotlin / Spring boot annotation ? This is my code. application-test.yml : export: path: /tmp/ filename: reports.csv Test file : @ContextConfiguration(initializers = [ConfigDataApplicationContextInitializer::class]) @EnableConfigurationProperties(value = [Config::class]) @ActiveProfiles("test") internal class ControllerTest {...

Kotlin: Using generics, implement a class that mimics an ArrayList I don't know how to solve this requirement. Help please Using generics, implement a class that mimics an ArrayList that will be used to store fruits and vegetables ( instances of these classes ). Implement only functions that you need. Eg: add, remove, size, etc.