Kotlin, How do I make a function for distinctBy method Suppose, I have this list which contains a list of employee info. val distinctEmployee = employees.distinctBy { it.firstName } I want to make a function and pass as a parameter for distinctBy method so I can apply any kind of distinct method to the list. I expect something like this. val highSalaryEmployee = employees.filterBy(salaryFilter) function salaryFilter(employee: Employee): Boolean { return employee.salary > 350000 } I have done this with filterBy method before, but I dont know...

how can remove text in html use jsoup java I want to remove the existing text And replace it with another text and then publish it html fun main() { println("Hello World") }

Jetpack Compose - mutableStateOf() not updating I got a ScreenState data class in my ViewModel: data class ScreenState( var isLoading: Boolean = true, val items: List = emptyList() ) and a mutableStateof: private val _homeScreenState = mutableStateOf(ScreenState()) val homeScreenState: State = _homeScreenState Updating the isLoading property works fine, the change gets send to my UI: _homeScreenState.value = _homeScreenState.value.copy(isLoading = true) But updating an item inside my List does not work. Here is how I try to do...

How can i set up Download Button that download an apk via Link? How can i set up Download Button that download an apk via Google Drive Link? Sample Code MainActivity.java: package com.example.project; public class VersionActivity extends AppCompatActivity

How to inject dependency in composable using dagger hilt Maybe I'm blind but I can't find anything about injecting a dependency that needs parameters in side a composable using dagger hilt. Lets say my ViewModel looks something like this: class MyViewModel @AssistedInject constructor(@Assisted myValue: Int) : ViewModel() { ... } and I've got a factory interface like this: @AssistedFactory interface MyViewModelAssistedFactory { fun create(myValue: Int): MyViewModel } how can I inject that dependency with a certain value as parameter? All...

Kotlin/AndroidStudio - problem with connect listView with RecyclerView I’m still learning and I see that there’s a long way ahead of me. However I got stuck with my app and I can’t find any clues online so I need your help. I have a problem with connect listView with RecyclerView: in the first ACTIVITY I have a list and after selecting the first position, my intention was that it should return a FRAGMENT with recycler view (and cardView). Unfortunately I try a lot of methods but I still don’t know the solution. Anyone help me, please? 😊 Animal Habitats class...

Use multiple variables in single string interpolation kotlin How should can I use multiple var in single ${} fun main() { var a = 5 var b = 20 if (b % a == 0 && b > a++) print("statement 1st - ${a--, --b}") if (a % 5 == 0 || a >= b++) print("statement 2nd - ${a--, --b}") }

Question about launchWhenX and repeatOnLifecycle I have the following code and a few questions that need to be answered: override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) lifecycleScope.launchWhenResumed { delay(2000) Log.d("LifeCycleAware", "launchWhenStarted: before calling") val result = differentDispatcher() Log.d("LifeCycleAware", "launchWhenStarted: after calling $result") } } private suspend fun...

Kotlin NoSuchMethodError after installing a library that enables a plugin I want to experience a library called arrow analysis My build.gradle.kts file looks as follows: import org.jetbrains.kotlin.gradle.tasks.KotlinCompile plugins { kotlin("jvm") version "1.7.10" } group = "org.example" version = "1.0-SNAPSHOT" repositories { mavenCentral() } dependencies { testImplementation(kotlin("test")) implementation("io.arrow-kt:arrow-core:1.1.2") } buildscript {...

How can to create a curved Text around a Canvas I'm beginner in jetpack compose, especially in Canvas. I want to create this with Canvas: But I don't know how. I could create curved Text but with fillMaxSize and it's not useful for me. Because I want to use this picture as a button in a page and I have some buttons like this one in one page. So I want to have this Canvas with wrapcontent size. So how can I create that?

Deserializing a generic type using gson in kotlin I have a generic type Animal implemented as a sealed class that can be a Dog or a Cat. sealed class Animal(val typeOfAnimal: String) { data class Dog(val barkVolume: Int): Animal("dog") data class Cat(val hasStripes: Boolean): Animal("cat") } According to http://jansipke.nl/serialize-and-deserialize-a-list-of-polymorphic-objects-with-gson/ you can deserialize an...

Mockito: You cannot use argument matchers outside of verification or stubbing I am trying to run the following simple test in Kotlin using Junit4 and Mockito open class B { lateinit var a: A public fun bFun(value: Int) : Int { return a.aFun(value) } } @ExtendWith(MockitoExtension::class) @RunWith(SpringJUnit4ClassRunner::class) class TestB { @Mock lateinit var a: A @InjectMocks lateinit var b: B @Test fun testB() { `when`(a.aFun(eq(1))).thenReturn(2) assertThat(b.bFun(1) == 2) } } However, I am...

Kotlin Compose global footer view I am trying to show an Ad banner at the bottom which is globally displayed. That means that I want to stick there when I navigate throughout the app. So far I've tried adding the NavHost and the AdView inside a Column, hoping that the navigation with the linked pages will just take the remaining space and the bottom view will stick there. However the NavHost takes the whole screen and the AdView has zero height. When I navigate the second view, the AdView is still inside the view hierarchy...

Unexpected implicit cast to TextView>: layout tag was TextView I have a function that accepts a Map: private fun chooseActiveElement(m: Map) {} This code works: chooseActiveElement(mapOf( 1 to (findViewById(R.id.labelFixNo)) )) But this one (parentheses removed) does not: chooseActiveElement(mapOf( 1 to findViewById(R.id.labelFixNo) )) Unexpected implicit cast to TextView>: layout tag was TextView I'm curious, why are the parentheses necessary and what does the error message mean exactly?

LazyVericalGirld prints index of data rather than value Good day, Currently learning android development by developing a "simple" calculator application. Using the LazyVeritcalGrid, i want to accept string data and display it in a text. the issue i am having is that instead of the actually string to be displayed, i'm getting the index number of the string when i add a .toString to the this is the code below //The list data val data = listOf( "AC", "+-", "%", "\u00F7", "7",...

For Android Developers, Interview Question When only onDestroy is called for an activity without onPause() and onStop()?

Android - LiveData observe not getting update from AndroidViewModel in active Activity I do see quite some questions about this issue but most of them are related to Fragment. I am calling it inside the activity but still not observing any changes. MainActivity.kt: class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val mainViewModel = ViewModelProvider( this,...

Swipe to Refresh But Swiping Up from Bottom Of Screen? in Jetpack Compose I haven't found a question that was exactly what I was asking. The only one I found was from 6 years ago: Android Swipe Up to Refresh ListView When I reach the bottom of a Column of Text lists, I want to be able to swipe up from the bottom of the screen to refresh and load more content of the list view. Bottom to Up. I checked the SwipeRefresh library from Google Accompanist, that library only...

Is this how I initialize a list with values in Kotlin? I want to store a number of counts per value, something like this: value count 0 -> 6 1 -> 2 2 -> 0 3 -> 7 As shown in the example, the values start at 0 and are consecutive integers. I want to initialize all counts with 0, so that I can then increment them. This is what I came up with: val histogram = Array(numBuckets) { 0 }.toMutableList() as ArrayList histogram[2]++ It works, but the initialization feels a bit convoluted. Is there a better way? Is the ArrayList the correct collection...

navigation bar doesn't work after fragment change bottom navigation bar doesn't work at all after I change fragment with supportFragmentManager. binding.addBookSelectBackBtn.setOnClickListener { (context as MainActivity).supportFragmentManager.beginTransaction().replace( R.id.nav_host_fragment_container, AddBookFragment() ).commitAllowingStateLoss() } How can I solve it?

applicationContext.getSystemService(SmsManager::class.java) returning null inside a Service Viewed quite a few similar questions so far, but none ended up a solution. I'm trying to start up a foreground service in order to handle SMS messaging. This service is started when the app is first opened and does work on background threads via kotlin coroutines. This process remains active even when the app has been closed. I'm not too well versed on the various Contexts, but I would have thought applicationContext would exist for the lifetime of the app, but the call I make to get the...

Android should you really use by Lazy in ViewModel as per Docs? This Android doc shows following code: class MyViewModel : ViewModel() { private val users: MutableLiveData by lazy { MutableLiveData().also { loadUsers() } } fun getUsers(): LiveData { return users } private fun loadUsers() { // Do an asynchronous operation to fetch users. } } and I'm wondering if it is really correct to use by lazy or...

How to implement `&&` (overlap) operator of postgres in DynamoDB? How to implement && (overlap) operator of postgres in DynamoDB? Like postgres behaves - select array[1, 2, 3] && array[2, 3]; -> true select array[1, 2, 3] && array[3, 4]; -> true select array[1, 2, 3] && array[4, 5]; -> false

getting image Uri in android i am wanting to grab the image uri, upload it to firebase in order for it to be available there and other users r able to see this image when connecting to the firebase database. only issue is when an image is selected, firstImage is set as content://com.android.providers.media.documents/document/image%3A525 which doesn't have the extension, whether it's .png, etc. the logic below is done in a composable function which is y something like gallery intent isn't used. any insights? var...

add version of app at bottom navigation view is not displayed properly As a lot of people are probably trying to do it, I am trying to add a footer to a navigation view. I did this: This working fine but not in 2 cases: small screen because the linearlayout overlap the menu and also if the keyboard is popped up, it move the layout. Any idea how to make sure that the linear layout with the app version stick to the bottom of the navigation or also below the menu item so it's not...

Price GoogleMaps SDK mobile aplication (2022) I am currently working on a native Android application with kotlin and IOS with swift in which I am integrating the google maps sdk. I am integrating a simple map where a marker will be drawn with a specific coordinate (latitude and longitude). My question is if the google maps sdk has any cost with the mentioned features, I have reviewed the documentation but I am a bit confused. For example in the following <a href="https://mapsplatform.google.com/intl/es/pricing/" rel="nofollow...

IT is base on error while building android studio groovy.lang.MissingPropertyException: Could not get unknown property '32' for object of type org.gradle.api.internal.artifacts.dsl.dependencies.DefaultDependencyHandler.

Mock trying to initialize fields I have a class that I am trying to mock and call a method on it - @Component open class CloudStorageService { @Autowired lateinit var s3Client: AmazonS3 fun getSizeOfFirstMatchedObject(bucketName: String, directory: String, prefix: String): Long { val request = ListObjectsRequest().withBucketName(bucketName).withPrefix("$directory/$prefix") val listObjects = s3Client.listObjects(request) val objectSummary = listObjects.objectSummaries.first() val size =...

why don't created tables in kopring? im starting learning kotlin + spring boot, and try create table by jpa but but dont created table in my code, below is my code build.gradle.kts ... dependencies { implementation("org.springframework.boot:spring-boot-starter-data-jpa") implementation("org.springframework.boot:spring-boot-starter-web") implementation("com.fasterxml.jackson.module:jackson-module-kotlin") implementation("org.jetbrains.kotlin:kotlin-reflect")...