How to use Zip operator of kotlin flow in Android In my application I want combine two deferent API with ZIP operator of Kotlin flow.! Api 1 is Movies list and Api 2 is genres list! I want loaded each 2 Apis in one time, for this I used zip operator! My work is true? Can I combine 2 deferent Apis with them? ApiServices : interface ApiServices { @GET("movies") suspend fun moviesList(@Query("page") page: Int): Response @GET("genres") suspend fun genresList(): Response } Repository class: class Repository @Inject...

Solve Problem android kotlin run asynchronously // pseudoclass for View Binding class // class ItemEpisodeBinding(val titleView: TextView, val downloadButton: Button, val progressView: ProgressBar, val lytImage: ImageView) class EpsdViewHolder(val binding: ItemEpisodeBinding): RecyclerView.ViewHolder(binding.root){ fun bind(episode: Episode){ binding.titleView.text = episode.title binding.downloadButton.isVisible = (episode.downloadStatus == NOT_DOWNLOADED)...

How to get child key in Firebase Realtimedatabase I'm trying to paging realtime databse , and my database structure looks like this. { "dinosaurs":{ "lambeosaurus": { "UID1_1sajdslkjzxdq2311a":{ "height" : 5.1, "length" : 12.5, "weight": 3211 }, "UID2_2cxzcxczz34zz":{ "height" : 2.7, "length" : 11.5, "weight": 5000 }, //.. } } } The key what I want to get is "UID1_1sa...". I tried with code below. val DBreference =...

Byte array to image view I am trying to Encrypt the Image with Aes and its working successfully But once I have the final decrypted Byte array I am unable to set to image val bitmap = (imge.drawable as BitmapDrawable).bitmap val width = bitmap.width val height = bitmap.height val decryptedText: ByteArray = cipher.doFinal(bytes) val configBmp = Bitmap.Config.valueOf(bitmap.config.name) val bitmap_tmp = Bitmap.createBitmap(width, height, configBmp) val buffer =...

Nothing show in Adapter when I use AsyncListDiffer and view binding I try to show data form api in Custom recycler view by using view binding and diffUtil I try to use DiffUtil with Binding view in RecyclerView Adapter but when I send the data from fragment differ.submitList(the DATA) nothing the show in the list when I debugging I found the data come from API and go to differ class NewsAdapter : RecyclerView.Adapter() { private val differCallBack = object : DiffUtil.ItemCallback() { override fun areItemsTheSame(oldItem: Article, newItem: Article):...

Animating a label (with TransitionManager) I am writing a small Android app and am now facing this basic animation challenge. I have a label positioned at the top-left of the display and I want to move it to the bottom-right using an animation taking about one second. This must be easy, but since this is my first Android app, I don't know yet how to do it. My current code is below. It is important for me that the label is generated programmatically. I have already looked on the net and think that I should probably use...

cant get any component in fragment class (kotlin) i manually created a fragment. but cant declare a component like web view or button. when i paste and edit "val webview: WebView ..." there is error "Fragment(R.layout.fragment_htmlviewer)" too. i dont know how to do, when i create from android studio, it looks like very complicated. so i watched a video and this is more easy but cant declare components. im very beginner so help me please... my code: fragment_htmlviewer.xml HtmlViewerFragment.kt class HtmlViewerFragment :...

Coroutines: main() runBlocking vs suspend main Given the following code (taken from the Kotlin documentation) import kotlinx.coroutines.* fun main() = runBlocking { launch { delay(2000) println("World") } println("Hello") } I get this output: Hello World However, the same result can be achieved by this code (taken from the Coroutines library README): import kotlinx.coroutines.* suspend fun main() = coroutineScope { launch { delay(2000) println("World") } println("Hello") } Now,...

kotlin exposed select with foreign key I have two tables like as I described below object Categories : LongIdTable() { val name = varchar(name = "name", length = 50).uniqueIndex() val count = integer(name = "count") val page = integer(name = "page") } object Images : LongIdTable() { val color = varchar(name = "color", length = 100) val blurHash = varchar(name = "blurHash", length = 200) val unsplashId = varchar(name = "unsplashId", length = 200) val category = reference(name = "category",...

timestamp UTC+0 in java or kotlin Could someone know how to generate a timestamp format like this “timestamp” : “2022-04-30T084002.640+00:00” I don’t recognize the format and don’t know how to generate it win kotlin, and it should be UTC+0. There are so many way to generate time, datetime and timestamp…I’m confused.

How to reuse TopAppBar and access its properties How can the properties of a top app bar be accessed and reused several times? Are there any limitations towards this approach? I want to be able to change the text in a top app bar when necessary. class MainActivity : ComponentActivity() { private val topBarTitle: String = "?" override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContent { AirlinesTheme { setContent { Scaffold(...

I cant solve this error "lateinit property dataBinding has not been initialized" I have base activity< T : ViewDataBinding , VM : ViewModel > extends AppCompatActivity() and i initialize view binding and view model but when run the app i get this error "lateinit property dataBinding has not been initialized" I don't know what I miss or what the wrong Below is Base Activity Code open abstract class BaseActivity : AppCompatActivity() { lateinit var dataBinding : T lateinit var viewModel : VM override fun onCreate(savedInstanceState: Bundle?, persistentState:...

Jetpack Compose activities and composables for large projects I've noticed that several sources encourage developers to only use a single activity in their projects. When would it be appropriate to have more than 1 activity in a project? Is there a limit to the number of composables an activity can have? 1 concern I have is for a large project requiring multiple screens, this can lead to heaps of code which eventually will become time consuming and difficult to scroll through and find.

How to fix the Incremental annotation processing requested error in android? I'm trying to implement (zxing-core-3.3.2.jar)in my project ,after imported the jar. Getting the following error. Help me to fix this! w: [kapt] Incremental annotation processing requested, but support is disabled because the following processors are not incremental: com.squareup.moshi.kotlin.codegen.JsonClassCodegenProcessor (NON_INCREMENTAL), javaslang.match.PatternsProcessor (NON_INCREMENTAL). Moshi Dependencies in my project: "com.squareup.retrofit2converter moshi2.5.0" ,...

Cannot import androidx.compose.ui.platform.DensityAmbient (DensityAmbient) I'm trying to import import androidx.compose.ui.platform.DensityAmbient and I can't. the DensityAmbient is red, seems like the class doesn't exist. This is my gradle: dependencies { implementation "org.jetbrains.kotlinkotlin stdlib1.6.21" implementation 'androidx.corecore ktx1.7.0' implementation "androidx.compose.uiui$compose_version" implementation...

Swapping elements inside adapter I'm making a file explorer synchronizing a directory in ftp, I would like that when a new item is downloaded it is displayed first in my recyclerview. For that I use sharedpreferences to store the new files and so I display or not a dot next to it to notify that it is new. Then I want to place it first at the begining of my MutableList, everything goes well except when I have to update with notifyItemMoved() which gives me the following error: java.lang.IllegalStateException: Cannot call this...

How to get list from List&lt;Pair&gt; in Android In my application I want combine two deferent lists and for this I used kotlin flow and combine & zip operators! I write below codes, but when used in activity I don't know how can I get lists! ViewModel codes : class ViewModel (private val repository: Repository) : ViewModel() { val moviesFlow = repository.moviesList() val genresFlow = repository.genresList() fun loadData(): Flow = combine(moviesFlow, genresFlow) { movieList: Response,...

How to make row in LazyColumn clickable How can the ripple effect be applied to the whole row of an item within a LazyColumn rather than just the text itself? Does Text need to be in a Row with a clickable modifier, or should something else be done? class MainActivity : ComponentActivity() { private var itemArray: Array? = null override fun onCreate(savedInstanceState: Bundle?) { itemArray = resources.getStringArray(R.array.array_breads) super.onCreate(savedInstanceState) setContent {...

build.gradle.kts not recognising object as variable I have a build.gradle.kts and I'd like to store all the versions there as : plugins {

java-platform

} javaPlatform { allowDependencies() } dependencies { val version = object { val androidx = object { val appCompat = "1.4.1" val core = "1.7.0" } .... api("whatever:${version.androidx.appCompat}")

add third party library to kotlin multiplatform mobile shared module Am writing a KMM mobile app that will be calling an AppSync API, my intention was to implement all the API calls in the shared module so that I don't have to write that code twice (i.e for iOS and Android separately) Secondly, I want to use the Amplify libraries in the shared module to implement the API calls, am hoping this would allow me to take advantage of lots of features such as offline storage. What I am noticing however is that even though I have successfully added the amplify...

Implemetation of cometchat sdk into kotlin project I have been trying to implement comet Chat sdk into my project. I followed the documentation for kotlin but each time i try to initialize comet chat i get several errors. Here are my codes. 1. Main Activity class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) initCometChat() } private fun initCometChat() { private val appID = "208314db190ca55b" private val...

how to make p2p connection in android app I am trying to make an android app in kotlin which have feature of P2P connection between two devices in spite of reason they are not in a same wifi. They should be able to create a server-client or whatever connection is possible but they should not include any other third party (expect they can use third party only in authentication: if that feature is added) I want this feature for making a messaging app which doesn't use central server while two are chatting.

Caused by: java.lang.IllegalStateException: Observable return type must be parameterized as Observable&lt;Foo&gt; or Observable&lt;? extends Foo&gt; Process: com.speakapp.app, PID: 25531 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.speakapp.app/com.speakapp.app.ui.SplashActivity}: java.lang.IllegalArgumentException: Unable to create call adapter for class pd.h for method d.o at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3340) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3489) at...

Splash Screen transition to Next Activity after delay We want to show Splash screen for 500ms and then start main activity we currently use handler.postdelay for this but it results in very high Frozen Frames, please help

How to make API calls using Ajax in android? I am given a task to create an android app where i need to call an API but using AJAX. I have been doing this using Retrofit till now but don't know how to use AJAX in kotlin or java. Please help.

Optimise grouping 512x512 coordinates into 117 smaller, quartered chunks I'm creating image map tiles for Leaflet.js based on data from a computer game. I'm processing the map data in Kotlin. A map tile server for Leaflet.js has to host image tiles at various zoom-levels, so I need to create them. These are the resolutions I want to create, based on a source image of 512x512px. 512x512 pixels (zoomed out the most) 256x256 pixels 128x128 pixels 64x64 pixels 32x32 pixels (the most zoomed in) A code example is at the bottom of this post. I'm using groupBy at the...

text issue while using Persian alphabet with number in android While using Persian text in Text or TextField compose, it won't show text in a proper way. For example, What should I do to handle this?

Android: BottomNavMenu stops working after manual navigation I have got a problem I can't find a solution for. I have an app with several fragments and bottomNavMenu. Normally navigation is done via bottom menu. However, I want to have navigation also when some views are clicked. NavMenu works fine. When I try to navigate via onClickListener from fragments to workoutFragment (set as startDestination) all works fine as well. But after I navigate from workoutFragment to others (via onClickListener), I can't get back to workoutFragment via bottom nav...

Ktor Client 2, getting Token while setting up client - JWT authentication I'm learning on Ktor client 2.0.1, and i'm trying to create a client (within a function) that can get its own Token, without the need of creating an function for it. because I thought that is possible. when i remove the install(Auth) code and ask for the authentication in a request like in the function below getToken() it gets the token correctly. but this means also that i have to include it manually in each request header. but as far i understand doing it while creating the client will...

How to make a coachmark that can fill the screen 100%? I need a coachmark that can follow size as an activity. But the coachmark dialog that I made is always blocked by the bar at the top of the screen. How do I get my dialog to cover the screen up to 100%? Here's what i mean : Here's my kotlin's code : private fun dialogCoachMark( activity: OnBoardingOneActivity ) { val dialog = activity.let { Dialog(it) }...