NoClassDefFoundError: Failed resolution of: View::OnUnhandledKeyEventListener I get following error log, but I can run my app. com.example.simplekodein I/zygote64: Rejecting re-init on previously-failed class java.lang.Class: java.lang.NoClassDefFoundError: Failed resolution of: Landroid/view/View$OnUnhandledKeyEventListener; com.example.simplekodein I/zygote64: at void androidx.core.view.ViewCompat.setBackground(android.view.View, android.graphics.drawable.Drawable) (ViewCompat.java:2560) com.example.simplekodein I/zygote64: at void...

How to use timer in recyclerView adapter on Android WHY NOT ANY PEOPLE HELP TO ME??? In my application i want use recyclerView and into this adapter i should show timer! I write below codes into adapter, but when scrolling on recyclerView start again timer from the beginning!! but i want when scrolling on recyclerView continue timer not start again begging ! For example : item one timer is 10:30 when scrolling down and again scroll up start again 10:30 ! I want continue 10:30 to receive 0 ! my adapter codes: class AuctionsTodayAdapter(val...

Keep sound playing within the App but stop it when App goes to the background So I have a Sound I want to play continuously throughout the whole of my App. But as soon as the App goes to background, the sound should stop. I´m trying to do this during onStop(). The problem is that onStop() is called every time the activity is stopped, regardless of whether I stay within the app or not. Is there a way to differentiate between those cases? Something like this: override fun onStop() { if [App is left but not destroyed] { super.onStop() mediaLength =...

Receiving data from a scanner [kotlin code] and send it to Flutter via MethodChannel I'm trying to build an app to read a scanner data (and other stuff with that) I (kind of / think I) know how to use a methodChannel to pass the data from kotlin to flutter, the scanner doesn't have a real plugin, but I can use a BroadcastReceiver + INntentFilter to listen to the 'scanner action'; my problem is to put both together, how can I make sure that whenever the Br..Receiver 'receive' something it will pass it to the method channel (WITHOUT touching the screen <a...

Kotlin runBlocking on background thread I'm in the process of converting an existing app from Java to Kotlin. The app creates an IntentService which runs in a background thread, and here I need to perform some operations which block the thread (e.g. network calls, database interactions) with suspend functions. Since the "current thread" is in fact a background thread I'm not blocking the UI. Is it a good practice to make use of runBlocking on the current thread to run all the suspending functions? Or there is a better approach?

How to deserialize dates with offset ("2019-01-29+01:00") to `java.time` related classes? I've refactored a legacy system (Spring Boot 2.1.2) and migrated from java.util.Date to java.time based classes (jsr310). The system expects the dates in a ISO8601 formated string, whereas some are complete timestamps with time information (e.g. "2019-01-29T152934+01:00") while others are only dates with offset (e.g. "2019-01-29+01:00"). Here is the DTO (as Kotlin data class): data class Dto( // ... @JsonFormat(shape = JsonFormat.Shape.STRING, pattern =...

Get item from Object ArrayList How can I call the access_role in OrganizationAccess ? This is the classes User class User : Serializable { var user_organization_accesses: ArrayList? = null } OrganizationAccess class OrganizationAccess:Serializable { var id = "" var access_role = "" } What I have tried mUser = intent.getSerializableExtra(ARG_PARAM) as User // receive from previous activity longToast("Role is " + mUser.user_organization_accesses!!.xxx) What should I write for the xxx ?

Views in RecyclerView still has height of 0 even when displayed I am confused because in my RecyclerView, some items has their height = 0 (even when they are correctly displayed and visible) and some have their normal height. How is that possible ? If I monitor the height with addOnGlobalLayoutListener, 90% of item has their correct height calculated, and 10% still have 0. Any idea of how android works for this ? My code is in Kotlin but it doesn’t matter. init { var heightItemView = 0 var currentY = itemView.y var oldY =...

Retrofit POST request never comes back to OnResponde I am trying to do a POST request with Retrofit, which actually works fine, but it never execute OnResponse function. The thing is that with GET works fine, but not with POST request. I tried changing the request status code from 201 to 200 but didn't work. Instead of a Toast in OnResponse I tried calling another function, tried to associate the body?.it value, etc but nothing of that works, even in debug mode... So I think OnResponse is never been executed. OnFailure is never executed too....

Why does one of my Controller function raises an exception after three calls? I'm currently working on a Spring-boot application written in Kotlin. I'm writting an API which permits a logged user to add a metro station or a metro line to his favorite (and have informations about it more quickly). My users are represented by the ApplicationUser class with a username, a password, a set of his favorite metro lines, and another set for his favorite metro stations. I have written a controller to allow logged in users adding a line or a station to their favorites. I also...

How to throw CAUSE on http request exception I have the follow REST controller import ...ApplicationUser import org.springframework.http.HttpStatus import org.springframework.web.bind.annotation.* @RestController @RequestMapping("/sign-up") class SignUpController: BaseController() { @ResponseStatus(HttpStatus.CREATED) @PostMapping fun signUp(@RequestBody applicationUser: ApplicationUser) { applicationUser.password = bCryptPasswordEncoder.encode(applicationUser.password)...

makeSceneTransitionAnimation shows an error when using AndroidX I have following method which works properly when I use android.support.v4 override fun onClick(movie: Movie, poster: ImageView, name: TextView) { val intent = Intent(activity, DetailActivity::class.java).apply { putExtras(Bundle().apply { putParcelable(EXTRA_MOVIE, movie) }) } val activityOptions = ActivityOptionsCompat.makeSceneTransitionAnimation( requireActivity(),...

Kotlin: Unexpected tokens (use ; to seperate expressions on the same line) I started to code in Kotlin, I give "a", "b", "c" doubles to "Discriminant" class as constructor parameters, but it give Unexpected tokens (use ; to seperate expressions on the same line) Discriminant class class Discriminant(var a: Double, var b: Double, var c: Double) { var discriminant: Double = 0.0 var firstRoot: Double = 0.0 var secondRoot: Double = 0.0 fun getD(): Double{ discriminant = (b*b) - (4*a*c) return discriminant } fun getX1(): Double{ firstRoot = ((-b) +...

Deserialize a nested json field with Jackon in Kotlin I've already deserialized some nested field in the past in Java, following instructions from https://www.baeldung.com/jackson-nested-values (section 5) : @JsonProperty("brand") private void unpackNested(Map brand) { this.brandName = (String)brand.get("name"); Map owner = (Map)brand.get("owner"); this.ownerName = owner.get("name"); } ownerName being a field in the bean. Now, I need to do...

Android RxJava2 - How to make api call when error is thrown? So I am currently chaining API calls together using flatMap and it is working very well for my use cases. If one of my calls return a failing response code, then I pass an error single that contains a throwable with a message that says which call failed and it keeps going. Here is how I'm doing it now: dataManager.apiCall1(dataManager.sessionId!!) .subscribeOn(schedulerProvider.io()) .observeOn(schedulerProvider.ui()) .flatMap{apiCall1Response -> if...

Firebase Storage upload task continuation never fires I am working on a project and I need to upload images to Firebase storage and get the download url before I can upload the associated model class to Firestore. I am trying to use countdown latches to block the main thread until the upload is complete. I know there are better methods out there and feel free to recommend some but I figured I could just through up a brief load screen. The issue is that the callback for the getDownloadurl task never gets called. I have searched and searched and...

Reactor lazy pagination with expand Based on How to collect paginated API responses using spring boot WebClient? I created the following crawler class class GitlabCrawler(private val client: WebClient, private val token: String) { fun fetchCommits(project: URI): Flux { return fetchCommitsInternal(project).expand { cr: ClientResponse? -> val nextUrl = getNextUrl(cr)...

Is there a way to retrieve Github repositories whose language has been changed? I am trying to get all repositories whose language was Java but had changed to Kotlin and vice versa. Does anyone know if it's possible to filter these repositories with the Github api?

@ControllerAdvice handle the exception but not customize response This is my exception handler @ControllerAdvice(basePackageClasses = [SignUpController::class]) class ControllerAdvice: ResponseEntityExceptionHandler() { @ExceptionHandler(Exception::class) @ResponseBody fun handleControllerException(request: HttpServletRequest, ex: Throwable): ResponseEntity { val status = HttpStatus.CONFLICT return ResponseEntity(ApiError(status.value(), ex.message), status) } } and my custom class data class ApiError(val status: Int,...

How to send data as a HashMap from javascript to kotlin in WebView on Android I am working with Android WebView and would like to send some data from javascript to native side which is written on Kotlin. On native side I have such a function, so I need HashMap with both Strings: @JavascriptInterface fun sendGoogleAnalytics(analyticsParams: HashMap){ analyticsParams.forEach { (key, value) -> Timber.v("Key: $key :: value: $value" ) } } I am not so familiar with javascript, so I have tried two options so far: var analyticsParams = new Map();...

Add a timer getting data from sqlite database and freeze app (android studio) I am trying to do every 30 sec getting data from sqlite database set to recycler-view. getting data from sqlite database is working but setting recycler-view time app freeze & system ui also crashing.tried using services also some problem facing. Below code written in kotlin language.Please suggest me some solutions fun reset_data() { timerTaskObj = object : TimerTask() { var millis = 0 override fun run() {...

Using Kotlin data class to group path variables in a Spring @RequestMapping annotated method Currently I am trying to reduce the number of parameters on @RequestMapping annotated methods in a class annotation with @RestController using kotlin data classes. Also I don't want to repeat myself on multiple @RequestMapping annotated methods which contain the same path variables. The code below shows my approach where /multiple/ABC/true/123 works as expected but /single/ABC/true/123 complains about a missing default constructor. data class Params(@PathVariable("param1") val param1:...

DynamoDB save only if GSI not exist I am trying to make my GSI(hashed_username) unique on application level. Came up with following code so far: val dynamoDBSaveExpression = DynamoDBSaveExpression() val expected = mapOf("hashed_username" to ExpectedAttributeValue( AttributeValue().withS(user.username) ).withExists(false)) dynamoDBSaveExpression.withExpected(expected) getMapper().save(user, dynamoDBSaveExpression) I do expect that save function will throw ConditionalCheckFailedException,...

How can I resolve these errors?

LiveData not Observing I implemented LiveData & ViewModel to mimic AsyncTaskLoader. I load file names from the camera directory in DCIM, and then i attach a fileObserver to Observe when a File (picture) is deleted, and then a callback tells the LiveData to re-fetch the fileNames The Problem: When I run the code for the first time, it works, that is, it fetches the file Names and calling setValue triggered onChange in the observing fragment. But when I delete a file (picture), the files are loaded again (as...

How to "vacuum" objectbox database file? tell me, how can I wait (analogue of VACUUM SQLite) database file? With saving entity IDs. I could not find the API. And my code does not work: val all = boxStore.allEntityClasses for ( clazz in all ){ val box = boxStore.boxFor( clazz ) val box2 = boxStore2.boxFor( clazz ) val ids = box.query().build().findIds() for ( id in ids ){ val obj = box[id] box2.put( obj ) } }...

Kotlin generics anomaly Ok so I have three interface types. 1- Movement 2- Animal - { Cat, Dog, Horse} 3- AnimalMovement Movement Interface interface Movement { fun moveAnimal(type:T) } Animal Interfaces interface Animal { fun takeSteps() fun jump() fun hide() } interface Cat : Animal { } interface Dog : Animal { } AnimalMovement interface CatMovement : Movement { } I then implement the CatMovement interface class CatMovementImpl : CatMovement { override fun moveAnimal(type:...

How do I inherit KDoc documentation in Java class? I have Kotlin classes with KDoc, for example: abstract class Something { /** # Documentation */ abstract fun someFun() } This class is extended by Kotlin and Java classes. KDoc is correctly inherited by Kotlin classes. KDoc is shown upon clicking Ctrl+Q in Intellij in the subclass. However, it does not work if the subclass is written in Java. KDoc is not inherited in this case. How can I inherit the KDoc in Java?

Set spinner item according to the value received Lets said I have two activities which named Activity A and Activity B. In Activity B, it has a spinner with three items, One,Two and Three. I'm passing value Two from Activity A to Activity B using intent. How can I set the spinner to display Two according to the value I pass from activity A in activity B ?

Kotlin 1.3.20 with Gradle 5.1.1 compileKotlin2Js execute hot reload In Kotlin 1.3.20 and Gradle 4.10.2, it is possible to hot reload js files with the following in Gradle: task watch { inputs.files 'src/main' doLast { compileKotlin2Js.execute() } } However, then we get a warning of: Deprecated Gradle features were used in this build, making it incompatible with Gradle 5.0. With Kotlin 1.3.20 / Gradle 5.1.1, the deprecation warning goes away, but the compileKotlin2Js.execute() results in the following error: Parameter specified...