Check if app's in foreground or background I want to update user status in firestore to online and offline according to whether the app runs in the background or foreground. I'm using LifecycleObserver for it, but the problem is I have to call it in every single activity for it to work. Is there a way to do this without having to call it in every activity? Observer class: class Observer(private val currentUser: User): LifecycleObserver { @OnLifecycleEvent(Lifecycle.Event.ON_START) fun onEnteredForeground() { if...

How to pass extension function as argument? There is an extension functions fun List.sortByTitle(): List { return this.sortedBy { it.title } } fun List.sortByArtist(): List { return this.sortedBy { it.artists[0].name } } What need to write in arguments of sort function in order to pass an extension function? fun sortByTitle(owner: String, kind: String) { sort(owner, kind) // pass List.sortByTitle } fun sortByArtist(owner: String, kind: String) { sort(owner, kind) // pass List.sortByArtist } private fun sort(owner:...

Why is ByteBuffer.get(byte[] dst, int offset, int length) so fast? The documentation says : public ByteBuffer get(byte[] dst, int offset, int length) Relative bulk get method. This method transfers bytes from this buffer into the given destination array. If there are fewer bytes remaining in the buffer than are required to satisfy the request, that is, if length > remaining(), then no bytes are transferred and a...

I'm having trouble linking a profile in my contacts app I created the contacts and profile interface in my contacts application that I have been working on for a while. However, I was stuck in the section of going to the profile of the person I clicked on my contacts that I designed with listview. I am waiting for support from my friends who understand Kotlin well. [1]: [2]: <a href="" rel="nofollow...

How to check all of items in Android I want develop test application and for this I want use this API : https://www.themealdb.com/api/json/v1/1/lookup.php?i=52772 In this API for show some info use many field, such as strIngredient1,strIngredient2,strIngredient3 and more to strIngredient15. I want first check each of this items, and when not empty. then show this. There are 15 items and I don't want check each of items! I want...

I have a problem with Simple Android Activity Lifecycle Could you explain me, why both of my Android 12 and Android 8 does not call method onSaveInstanceState() class MainActivity : AppCompatActivity() { private lateinit var binding: ActivityMainBinding override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) binding = ActivityMainBinding.inflate(layoutInflater).also { setContentView(it.root) } Log.d("AAAAA", "onCreate") binding.buttonSet.setOnClickListener {...

Applying a style/theme to one module only I'm creating a first multi-module application, which consists of 4 modules: app domain data presentation the app module contains it's own separate "themes.xml", but I cannot use that inside of presentation module (cause it is not a shared module, and I don't want to make it a shared module) Is there a way to create a separate themes only for the presentation package? and how does one apply it to a fragment?

LocationServices.getFusedLocationProviderClient(Activity()) - Attempt to invoke virtual method 'getApplicationContext()' on a null object reference I'm building an android app which using a map fragment. Lately I redesigned my app and moved the map view to a fragment. everything worked before, I'm asking for permissions and manifest has the parent activity of the current fragment. While I'm trying to get fused location provider as following: override fun onMapReady(googleMap: GoogleMap) { mMap = googleMap mFusedLocationClient = LocationServices.getFusedLocationProviderClient(Activity()) } I'm getting:...

Page crashes after splashscreen I am developing an application with jetpack compose. The interface was working, today I wrote the necessary codes to make transactions using the room database. After adding the database codes to the relevant fields in the panel page, the application crashes after splashscreen. I couldn't find the error. Since the codes are long, I share the codes on the github page. Mainactivity class MainActivity : ComponentActivity() { @DelicateCoroutinesApi override fun...

Adding spacing between BottomNavigationItem's icon &amp; label I'm trying to build out my Bottom navigation like this: @Composable fun BottomNavBar(navController: NavController) { Column( Modifier.background(colorResource(id = R.color.pastel_orange_white)) ) { BottomNavigation( modifier = Modifier .defaultMinSize(minHeight = 70.dp), backgroundColor = colorResource(id = R.color.bottom_nav_dark) ) { val navItems = arrayOf( BottomNavItem(...

Android linking Faild ERROR:C:\Users\aron.kibet\AndroidStudioProjects\Status_Saver22\app\src\main\res\layout\activity_main.xml2️⃣ AAPT: error: attribute layout_height (aka com.example.status_saver22:layout_height) not found.

Kotlin Client send and receive image from Linux python3 socket Server I'm trying to send and receive Image with Socket connect However, the string between the client and the server can be exchanged, but it does not proceed from exchanging images. This is My Kotlin Client code class MainActivity : AppCompatActivity() { lateinit var binding: ActivityMainBinding override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) binding = ActivityMainBinding.inflate(layoutInflater) setContentView(binding.root)...

Kotlin not making request Volley - android I am trying to "dynamically" create CardView and then fill TextView with data from an API call. The thing is, to me it seems like the request is not getting called. I created an adapter class based on Create dynamically lists with RecyclerView which is working fine and I am adding as many windows as needed. And then in the MainActivity, I am trying to do an API request with Volley. Before...

How do I create an application using kotlin command? [closed] When a user types the Kotlin code, the output is printed Is there any suggestion about this?

How to change the selected recyclerview item position to the first position and background colour here I change the selected item position and set that item to the first position init var selectedItemPos = -1 holder.itemView.setOnClickListener { selectedItemPos = position Collections.swap(dataset,0,position) notifyDataSetChanged() } if (selectedItemPos == position) holder.itemView.setBackgroundColor(Color.parseColor("#200f726b")) else...

How to call suspend function on init? I'm a bit lost here, I dont quite get how suspend functions work yet so any tips or fix for this one? init: init { val settings = FirebaseFirestoreSettings.Builder() .setCacheSizeBytes(FirebaseFirestoreSettings.CACHE_SIZE_UNLIMITED) .build() db.firestoreSettings = settings credentials = getCredentials() // Throws 'Suspend function 'getCredentials' should be called only from a coroutine or another suspend function' } Suspend function: // ... this function is...

CountDownTimer in Android ViewModel executes onFinish twice I tried to implement a timer in a ViewModel that after ten seconds returns to the previous view, but it doesn't work at all. I wonder if CountDownTimer can even be used in a ViewModel. class PairingScreenViewModel( private val routing: NavController, ) : ViewModel() { var content = mutableStateOf(10) var counter: CountDownTimer? = null init { viewModelScope.launch { delay(1000L) counter = object : CountDownTimer(9000L, 1000L) {...

Jetpack Compose: Reading and storing Byte array from a URL stream in a Coroutine scope I am trying to use the Android MLKit text recognition tool to read the text in an image from the internet. It requires an InputImage object, and I want to create one using the fromByteArray method. I planned on opening a URL stream and reading it into a Byte array, in the code below. But I got a...

compileReleaseJavaWithJavac' task (current target 1.7) and 'compileReleaseKotlin' task (current target 1.8) jvm target compatibility should be same I'm Using a third party library as a jar download in my project called "bandlibrary". Getting following error. [root@ip-172-31-23-189 hsandroidconsumer]# ./gradlew assembleABCRelease Configuration on demand is an incubating feature. Configure project :app Warning: The 'kotlin-android-extensions' Gradle plugin is deprecated. Please use this migration guide (<a href="https://goo.gle/kotlin-android-extensions-deprecation" rel="nofollow...

testing Repository class that takes DAO parameter I am learning Kotlin to build a note app. I have created a repository class as shown below which takes a Dao parameter. For now, the source of data is just Dao but in the tutorial I am following, it calls an API class as well. What I want to know is how do I test a repository classes logic? import androidx.lifecycle.LiveData import com.example.lastnotetakingapp.db.daos.NoteDao import com.example.lastnotetakingapp.db.models.Note class NotesRepo(private val notesDao: NoteDao) { val...

I can't redirect to another page when I click on listview I'm designing a phone book application, I've done most things, but I can't go to the profile of the person whose name I clicked. I would appreciate if you explain the use of setOnListener in detail. class MainActivity : AppCompatActivity() { var listView: ListView? = null lateinit var binding: ActivityMainBinding override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) binding = ActivityMainBinding.inflate(layoutInflater)...

Animate canvas items that are based on a constantly changing list state TL;DR: How would I animate multiple item heights within the Canvas. Like the height of these spikes in a waveform. A little back story: I'm writing an app to display the waveform of an ongoing audio recording. I'm taking the bytes directly from an AudioRecord and calculating the amplitude every 1000ish samples and pushing them to a list that is then observed in a composable. The usage within the composable looks something...

Kotlin Multiplatform multi-project Gradle error: "Projects must be configuring" I have a Kotlin Multiplatform project (1.7.10), with multiple subprojects, using Gradle 7.4.2. When running Gradle tasks I regularly get an error message from the Kotlin Gradle plugin: * What went wrong: Execution failed for task ':modules:web-map:publicPackageJson'.

Error while evaluating property 'externalDependencies$kotlin_gradle_plugin' of task ':modules:web-map:publicPackageJson'

> Projects must be configuring The error will not go away, unless I somehow force the project to...

Haskell equivalent of Kotlin's invariant types In Kotlin i can do sealed class Substance { object Uranus : Substance() object Mercury: Substance() object Ammonia : Substance() } data class DangerousBox(val item: T) fun main() { val uranus = DangerousBox(Substance.Uranus) val mercury: DangerousBox = uranus } Now i have invariant types DangerousBox, DangerousBox etc., so sample above would't compile. How make it in Haskell? Ideally i would like to have types uranus :: DangerousBox Uranus uranus = DangerousBox Mercury...

Build script-is it a build gradle Caused by: org.gradle.api.internal.artifacts.ivyservice.DefaultLenientConfiguration$ArtifactResolveException: Could not resolve all files for configuration ':app:debugRuntimeClasspath'.

Kotlin filter nested lists I want to filter a list that has episodes of series. The list looks a bit like this: [ { "media": { "episode_number": "7" }, "collection": { "collection_id": "26464" } }, { "media": { "episode_number": "6" }, "collection": { "collection_id": "26464" } }, { "media": { "episode_number": "9" }, "collection": { "collection_id": "123456" } } ] I only want the highest episode number of each collection...

How to send empty string on query parameter retrofit kotlin I have an API URL like https://api.github.com/search/users?q="", so I try to hit it with the postman, and it is fine. And then I want to implement that request using retrofit. So I create an Query Parameter on retrofit, like this, @GET("search/users") @Headers("Authorization: token ${BuildConfig.TOKEN}") fun searchUser(...

Gradle Sync: "Cannot find a variant matching build type 'null' and product flavors '[]' in module" [AGP] There's a syncing problem that only appears while trying to use Android Gradle Plugin version 7.2.0 and above; So, the sync is successful with AGP 7.1.3, but fails with 7.2.1 or even 7.4.0-alpha08. The project is a KMP project, but for the above reason, I assume the issue is related to AGP and its configuration. Project Structure The project's android target follows the modular architecture described below: ┌─────────────┐ Depends On ┌────┐ ┌────┐ ┌─────────────┐ │ :androidApp │...

java.lang.ClassCastException for currency conversion class I'm using Ktor client to get currency conversion rates, the Json response I get starts like this BODY START { "result":"success", "documentation":"https://www.exchangerate-api.com/docs", "terms_of_use":"https://www.exchangerate-api.com/terms", "time_last_update_unix":1657929601, "time_last_update_utc":"Sat, 16 Jul 2022 00:00:01 +0000", "time_next_update_unix":1658016001, "time_next_update_utc":"Sun, 17 Jul 2022 00:00:01 +0000", "base_code":"USD", "conversion_rates":{ "USD":1, "AED":3.6725,...