DataBinding enable button Android If text ok for my condition enable button, else disable. This Code not work android:text="@={insertCredential.username}" android:enabled="@{insertCredential.rememberMe}" class InsertCredentialObserver : BaseObservable() { private var username: String = "" private var rememberMe = false @Bindable fun getUsername(): String { return username } fun setUsername(username: String?) { this.username = username!! notifyPropertyChanged(BR.username) if...

Kotlin Generics: Lifecycle-level storage for multiple instances of Class&lt;T&gt; where T is different for each instance Im trying to make an abstract FormFragment to reuse for all my forms in future proyects. Almost everything about the generics are ok as class level parameters goes. But im trying to implement the following idea: I want that my Abstract fragment implements a class-level attribute that stores 1...N "BaseAdapter< T >" where T is my entity wich may (will) vary for each BaseAdapter. I'm done implementing this with only one BaseAdapter< T > because i can straight fordward use the main < T > i sent...

How to navigate from specific selected item RecyclerView Inside the Fragment, to 2 different Activity from same RecyclerView in Kotlin? How to navigate from specific selested item RecyclerView Inside the Fragment, to 2 different Activity in Kotlin? i have the basic wireframe layout, who describe my question, because i don't know how to explain with good typing. so here from the wireframe, i have 1 Activity with TabLayout, which is filled with Fragment and there is a RecyclerView in it. And then I have 2 more different Activities. for now, i've...

Spring webflux flux.fromiterable Can someone help me on this. I have a list of entities and I have to call rest call for each of the entities. I have used flux.fromiterable for the same. But the control is not even coming to the rest client.

Android: onClickListener fires a observer to update field on UI, again and again I have a question. This is my situation. I have a UI to update values on an Data Object (room data). Let's say that is a radio Button, but could be anything. I want that every time the user click on a field (radio button, text, checkbox) the database get updated, I don't want a "save" button. To achieve this, I have a bunch of onClicklistener() on each view element. These listeners call some method on the viewmodel instance, that updated the MutableLiveData of that class, firing, the observer...

How to implement Banner Ad in Android Studio Kotlin? I followed the instructions in the google documentation but it doesn't work, the app closes when trying to open the activity where the ad would be, the whole app is made with recyclerview, the error is: java.lang.NullPointerException: findViewById(R.id.adViewComoSeJuega) must not be null This is my Activity: class ComoSeJuegaActivity : AppCompatActivity() { lateinit var mAdView : AdView override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState)...

android.database.sqlite.SQLiteException unknown error (code 0 SQLITE_OK): Native could not read blob slot I see the following error message on BugSnag only for the users who has a massive amount of data persisted on the sqldelight database android.database.sqlite.SQLiteException · unknown error (code 0 SQLITE_OK): Native could not read blob slot CursorWindow.java:-2 android.database.CursorWindow.nativeGetBlob CursorWindow.java:434 android.database.CursorWindow.getBlob AbstractWindowedCursor.java:47...

Can we print each statement for every 1 second or 5 seconds or any number of seconds in kotlin I want to print the following code which prints the numbers from 1 to 10 to be printed one by one with a time gap. I'm a beginner in Kotlin, so is there any method/or a function to do this?. If not what type of logic is required to achieve this?. fun main(){ var countNumbers= mutableListOf("1","2","3","4","5","6","7","8","9","10") for(i in countNumbers) { println(i) } }

Composite-id class must implement Serializable: io.digiwave.entities.StoreEntity I try to use Hibernate in Quarkus with Kotlin. The entity definition looks as follows: @Entity open class StoreEntity( ) : PanacheEntity() { @EmbeddedId lateinit var userId: UserId lateinit var password: String var createdAt: Long = 0 } and the composite key: @Embeddable open class UserId( ) : Serializable { lateinit var id: String } Unfortunately the compiler complains: Caused by: org.hibernate.MappingException: Composite-id class must implement Serializable:...

TextViews never update Here's the gist: I'm a beginner, and am trying to create an app where you input a number and if that number matches a randomly generated number you "win". My issue is that I have 2 textviews towards the bottom of the screen and their values never update. One (tVWinORLose) for displaying a simple "You Win/Lose", and one (tVFinalOutput) for outputting your guess and the randomly generated number. After I click the "Press to Guess" button, they both remain blank. Assistance would be greatly...

How would I update a single item in an ArrayList of items with data from Room? (android Kotlin) I am fetching a list of dogs from an endpoint. Some of the attributes of the dog, color for example, are identified by id. The id's and colors corresponding to the id were all saved in a database when the app is opened. I am using MVVM architecture and assume that the model is consuming the response data correctly. In the main screen of the app, I have a recyclerView that will populate with a list of dogs. when I fetch the list of dogs, I am returned the id of the dog's color as part of the...

How can i parse JSON object with multiple arrays? fun main(args: Array) { val client = HttpClient.newBuilder().build() val request = HttpRequest.newBuilder() .uri(URI.create("https://api.track24.ru/tracking.json.php?apiKey=$api&amp;domain=Artur&amp;pretty=true&amp;code=$trackCode")) .build() val response = client.send(request, HttpResponse.BodyHandlers.ofString()) println(response.body()) @JsonIgnoreProperties(ignoreUnknown = true) data class jsonToKotlin( val status: String?, val data: HashMap ) //val mapper = jacksonObjectMapper()...

Why is my kotlin hash set not adding elements I am new to kotlin and I want to make an abstract/open class or interface, something that can be implemented by other classes. Let's call it Test. Now Test needs to have a HashSet (the docs say it requires less memory than a normal set) that every derived class will implement and fill with its own values. interface Test { val players: HashSet } class Supa: Test { override val players = hashSetOf() fun later() { players.add("new player") } } fun main() {...

@Composable invocations can only happen from the context of a @Composable function(Google SignIn) @Composable fun loginButton(loginType: Int, context: Context, googleSignInClient: GoogleSignInClient?) { Column(horizontalAlignment = Alignment.CenterHorizontally, modifier = Modifier.fillMaxWidth()) { if (loginType == 0) { OutlinedButton(onClick = { googleSignIn(context = context, googleSignInClient = googleSignInClient) }, border = BorderStroke(2.dp, Color.Black), colors = ButtonDefaults.buttonColors(backgroundColor = Color(0xFFFFFFFF)),...

Where is annotation stored in ir tree for backing field? Where is annotation stored in ir tree? is it in backing field descriptor? I have @Deprecated("") val DEPRECATED_STATIC_FIELD = "deprecated field" ir tree is below PROPERTY name:DEPRECATED_STATIC_FIELD visibility:public modality:FINAL [val] annotations: Deprecated(message = '', replaceWith = , level = ) FIELD PROPERTY_BACKING_FIELD name:DEPRECATED_STATIC_FIELD type:kotlin.String visibility:private [final,static] EXPRESSION_BODY CONST String type=kotlin.String...

Broadcast IR signals using API level 16 (android 4.1) in android studio i am trying to develop an app that uses the IR blaster on an old phone to mimic a i found the but support for IR was only added in API level 19. is there a way for me to make an IR app on a phone that only supports android 4.1 (LG Optimus F6 T-Mobile version)

why is the wrong activity launched in Android App? I assume, there ist something wrong with my AndroidManifest.xml. The relevent part is with MainActivity.kt beeing class MainActivity : AppCompatActivity() { private lateinit var text123: TextView private lateinit var YOBtn: Button override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState)...

Kotlin constructor val vs private val If I have something like the following: interface IRecordService { fun doSomething () : Record } @MongoRepository interface IRecordRepository : MongoRepository { } @Service class RecordService ( private val recordRepository : IRecordRepository // or just val instead of private val ) : IRecordService { override fun doSomething () : Record { // does something } } Is there any difference between using private val in the RecordService constructor vs just val? I've seen...

android.app.contextimpl cannot be cast to android.content.contextwrapper I created a SDK for sms syncing import android.content.Context import android.content.ContextWrapper import android.app.Application import android.view.View import androidx.lifecycle.LifecycleOwner import androidx.lifecycle.Observer import androidx.work.* fun Context.lifecycleOwner(): LifecycleOwner? { var curContext = this var maxDepth = 20 while (maxDepth-- > 0 && curContext !is LifecycleOwner) { curContext = (curContext as ContextWrapper).baseContext } return...

Android Studio Import module unity library : Specify location of gradle or android eclipse project I'm trying to add a new module to import an aar package of a unity library by providing the following path : G:\sample\UnityLibrary\unityLibrary\build\outputs\aar\unityLibraryDebug.aar But I'm getting this message every time I type the path : Specify location of Gradle or Android Eclipse Project

How to perform firebase authentication that returns a flow in android kotlin What I currently have: I have a service class where I perform firebase registration for a user. It is working. What I am trying to do: I am trying to return a flow Current code: class LoginService @Inject constructor( // This contains the firebase auth reference val service : FirebaseAuthRepository ) { private fun registerUser( firstName:String, lastName:String, email:String, password:String ) { // Create an instance and create a register a user with...

TransactionTooLargeException: data parcel size 896372 bytes mBinding.attachBtn.setOnClickListener { mGetContent.launch("image/*") } This is the launch code mGetContent = registerForActivityResult(ActivityResultContracts.GetContent(), ActivityResultCallback { val intent = Intent(APP_ACTIVITY, CropperAcrtivity::class.java) intent.putExtra("DATA", it.toString()) startActivityForResult(intent, 101) }) Initializing mGetContent override fun onActivityResult(requestCode: Int, resultCode: Int,...

Cloning object of subclass type in Kotlin I wanted to be able to define a method to clone an object that is the same type of itself. I define the interface requesting such, but the following does not compile or run. interface Foo { fun copy() : T } class Bar(private val v:Int) : Foo { override fun copy():Bar = Bar(v) } main() { val bar1 = Bar(1) val bar2 = bar1.copy() } If however I write the implementing class in Java, it will compile class Bar implements Foo { private int v; public Bar(int v) {this.v = v;} public...

what's the difference between The Method reference and lambda expression in kotlin? I'm testing the difference between method ref and lambda. I tried using both, and found the difference in decompiled code. that was like below. public final class TestKt { public static final void main() { final Print printTest = new Print(); text((Function0)(new Function0() { // $FF: synthetic method // $FF: bridge method public Object invoke() { this.invoke(); return Unit.INSTANCE; } public final void...

how to enable @Preview for kotlin desktop compose demo project? I downloaded the demo project to study kotlin compose. I try to add @Preview on a @Composable fun, but get warn that: Unresolved reference: Preview I add implementation("androidx.compose.ui:ui-tooling-preview:1.1.1") in kotlin.sourceSets.named("CommonMain").dependencies in <a href="https://github.com/JetBrains/compose-jb/blob/master/examples/codeviewer/build.gradle.kts"...

Efficient rendering of many Jetbrains Compose elements at absolute coordinates within a graphics layer I am trying to render a large number of "nodes" in a freeform sandbox area with Jetbrains Compose. Each node has it's own X,Y position. The editor is in a graphicsLayer where it can be panned and scaled. Inside this sandbox area, each node is offset by it's X,Y values and then rendered. However, the graphicsLayer has it's own size, and when translated/panned far enough that it goes off screen, all "nodes" disappear since Compose thinks that the bounding box of the graphics layer is no longer...

Why does Gradle force a Kotlin version, and how to fix it? I have a simple Gradle project that includes the following configuration: plugins { kotlin("jvm") } This does different things when running with different gradle versions: $ ./gradlew wrapper --gradle-version=7.5 $ ./gradlew --version Kotlin: 1.6.21 $ ./gradlew wrapper --gradle-version=7.4.2 $ ./gradlew --version Kotlin: 1.5.31 $ ./gradlew wrapper --gradle-version=7.2 $ ./gradlew --version Kotlin: 1.5.21 OK, so Gradle is determining the version of the Kotlin plugin....

This suspend function is taking very long time to execute ,How can I optimize this? I am writing code to get newsfeed from database and to show this feed in UI . This is my Firestore database structure users->uniqueUserId |-->UsersProfileInfo--->Profile(document) |-->FeedNewsFeed |--->unique documents for each newsfeed |--->unique documents for each newsfeed |--->unique documents for each newsfeed to get each news feed from every users in my user collection I have to write nested...

kotlin language not working with use of command prompt and notepad I installed Kotlin command line compiler wrote following program as '.kt' and saved it as hi1.kt 'fun main(args:Array) { println("Hi") }' i tried to compile it by usual way in cmd with kotlinc hi1.kt -include-runtime -d hi1.jar shows warning as parameter 'args' never used and if i try to run program by java jar hi1.jar shows Error:could not find or load main class jar Caused by:java.lang.ClassNotFoundException : jar can any body help me with situation what should i do Note:-I have set...