Kotlin Enum to Basic Type mapping I have a login API, which accepts that a field, type is either "email" or "phone". I'd like to make them Enums enum class LoginBodyType (val value: String) { EMAIL("email"), PHONE ("phone") } I have a data class similar to follows class LoginBody (val type: LoginBodyType) { var phone: String = "" var email: String = "" var password: String = "" } so that when I call the login function, it will be something like this val body = LoginBody(LoginBodyType.EMAIL) body.email =...

Resolving a condition that requires Boolean but found Boolean? Kotlin 1.4.0 Resolving a condition that requires Boolean but found Boolean? I have the following code: detailList.firstOrNull()?.postCode.takeIf { postcode: String? -> postcode?.run { this != ZERO } }?.also { postcode -> view.editTextPostcode.setText(postcode) } Here I get a error that saids required Boolean found Boolean? As postcode could be null, I am wondering why its not smart casted to a non-null. This works by removing the safe call operator...

Integrating Native code with CameraX to Custom React Native Component Fails Hello I have an app that used now deprecated Camera module in android for displaying the camera view and drawing filters onto it using mlkit face detection. Recently we've decided to upgrade it to CameraX, I did all the necessary steps to make it work as a separate android app and it works. When I want to incorporate it to our existing Custom React Native module no matter what I do, it doesn't show anything on the screen. I've checked the view sizes and they seem to be ok. Below is the code I...

how to Mock a usecase using Mockito I am trying to mock a use case in android, but I get the following error org.mockito.exceptions.misusing.InvalidUseOfMatchersException: Invalid use of argument matchers! 3 matchers expected, 1 recorded: Unit test - mocking quaControlRequest = QuaControlRequest("2", "3", "4", "result", "engineerName", quaControlSignature) val captor = argumentCaptor() every(quaControlCheckCompleteUseCase.execute("1", quaControlRequest, capture(captor))).thenAnswer { } Usecase...

Cannot access 'android.support.v4.app.Fragment' which is a supertype of 'com.google.android.youtube.puTubePlayerSupportFragment'.layer? I am getting this error "Cannot access 'android.support.v4.app.Fragment' which is a supertype of 'com.google.android.youtube.player.YouTubePlayerSupportFragment'. Check your module classpath for missing or conflicting dependencies" but I implemented all things correctly regarding youtube player API private fun initializeYoutubePlayer() { youTubePlayerFragment = supportFragmentManager .findFragmentById(R.id.youtube_player_fragment) as...

RuntimeException AndroidInjection.inject in Dagger2 service I have a service and I'm using dagger2 v2.27, In the google play store consolo y have the following crash (I don't have this crash in Firebase console tho) Caused by: java.lang.RuntimeException: at dagger.android.AndroidInjection.inject (AndroidInjection.java:124) at app.ui.main.ServiceNotificationListener.onCreate (ServiceNotificationListener.java:34) at android.app.ActivityThread.handleCreateService (ActivityThread.java:3758) I'm using a Service that extends Android...

How to get ISO and Exposure time of captured photo with Android CameraX? I use Android CameraX in my application for taking photos. When I capture a photo, I can either use the ImageCapture.OnImageCapturedCallback or the <a...

Chat using WebRTC with React hooks and Kotlin Websockets I'm trying to implement a text chat using webRTC. My client app uses React and the server Kotlin. I am trying something like this: On server side I have a ChatWebSocketHandler: class ChatWebSocketHandler: TextWebSocketHandler() { private val log: Logger = LoggerFactory.getLogger(MeetingWebSocketHandler::class.java) private val INIT = "init" private val LOGOUT = "logout" private val chats: MutableMap = HashMap() override fun afterConnectionEstablished(session: WebSocketSession) {...

MPAndroidChart use exact value numbers on yAxis I'm using MPAndroidChart in my app. I want my values on yAxis to be custom. This is how my entries look like: [Entry, x: 0.0 y: 70.0, Entry, x: 1.0 y: 20.0, Entry, x: 2.0 y: 11.0, Entry, x: 3.0 y: 11.0, Entry, x: 4.0 y: 8.0, Entry, x: 5.0 y: 8.0, Entry, x: 6.0 y: 3.0] Currently with a minimum 0 and maximum 70 I have [0, 10, 20, 30, 40, 50, 60, 70, 80] but I want it to be [8, 6, 11, 20, 70] for yAxis. Does anyone know how to use the exact values?

What is the performance impact of having 2-3 chained BaseFragments I was wondering if it's a bad practice to have a Fragment that extends a BaseCategoryFragment that also extends a BaseFragment. BaseFragment is an abstract class that has some methods that are useful in all fragments in my app, BaseCategoryFragment extends BaseFragment and has some methods that are used only by a group of fragments. Is there any antipattern or performance impact of having them chained like this?

Retrofit doesn't send POST request I can't seem to get the POST request working with Retrofit. My code: ApiService.kt contains a function @Headers("Content-Type: application/json") @POST("resume") suspend fun resumeAsync(@Body request: JSONObject): Response Then in my ListViewModel.kt I have a function fun resume(id: String) { coroutineScope.launch { try { val paramObject = JSONObject() paramObject.put("id", id) val response = Api.retrofitService.resumeAsync(paramObject)...

Android Navigation Drawer ActionView animation I want animate navigation drawer menu item action view, but it is not work. my navigation view menu: menu_item_action_view.xml: and I try to animate actionlayout like this (Kotlin): val view = mainActivityNavigationView.menu.findItem(R.id.storeTitle).actionView view. animate().rotation(0).setDuration(500).start() and it give me this error: 09-15 134235.680 28286-28286/com.example.android_barcode E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.android_barcode,...

How to count child entities with room efficiently? I have those entities in my app: @Entity(tableName = "parents") data class Parent( @PrimaryKey val name: String = "", val numberOfChildren: Int = 0 ) @Entity(tableName = "children") data class Children( @PrimaryKey val parentName: String = "", val name: String = "" ) I want to update numberOfChildren to count how many children per parent. Initially I thought about fetch the children, count and insert to parents and then again to the database but It seems to me...

How to build text chat app using React, WebRTC and Kotlin I'm trying to integrate a chat in my app. The client app is using React Hooks and the server is built with Kotlin. After long searches, I can't find a suitable example. They are mainly using JavaScript with different libraries. Please help me with suggestions or examples!

canvas draw bitmap crash on Android 10 but not on Android 8 I used canvas to draw bitmap and I used two version of android 8 and 10 to test. Somehow android 10 crash and I just dont seems to understand this error message: java.lang.IllegalArgumentException: software rendering doesnot support hardware bitmaps Below is my code. The crash is on the this line: canvas.drawBitmap(bitmap1, 0F, 0F, null) private fun DrawRectTextAndBitmap() { val strOwnerName: String = "Owner: " + tvOwnerName.text.toString() val strCtcName:String =...

Kotlin Async API definition with Generics I moving my framework written in Java Android to Kotlin, to be able to support crossplatform trend. I'm pretty much new to Kotlin and I can't figure out all the details all the way. The issue that I have is to rewrite existing Java interface to Kotlin, and to be able to include in/out varaince to be able to easily pass different generic subclasses. Existing Java API is this: /** * Channels API * * @author Veljko Ilkic */ public interface ChannelsAPI { /** * Get channel list...

Kotlin - Open other fragment on click CardView in another fragment I'm new in Android Studio and having trouble opening fragment on click CardView in other fragment. I have Navigation View in layout and navigate to other fragment (fragment_home, fragment_gallery, fragment_slideshow, and other fragment layout.). But I have to create CardView in fragment_home to click for open some fragment layout (Gallery and Slideshow). I have Her is my Layout: 1. fragment_home.xml 2....

Error when getting chat messages from socket.io server in Kotlin When I want to get Messages from my Server in socket.io, I get the following problem: "Unresolved Reference "toString()" My code so far: import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import com.github.nkzawa.emitter.Emitter import com.github.nkzawa.socketio.client.IO; import com.github.nkzawa.socketio.client.Socket; import kotlinx.android.synthetic.main.activity_main.* class MainActivity : AppCompatActivity() { private lateinit var socket:Socket; private...

setvisibility for button is not working in android Basically the idea is adding the address in activity address when clicks on plus it will redirect to next page where the user gets the address form onsubmit it will fetch address and add to previous activity recycleview. scenerios:-- 1-->when the recycleview is empty in address actvity it shows the empty text and also the button is not visible ==>no problem in here 2-->when the recycleview is not empty in address actvity empty text is gone but button is not visible ==>im unable to see...

How to read data from room I have created the entities and the dao classes, and also the database class, where i populate the database. Now i want to test it and read some datas. How can i do it? This is an example of one entity: @Entity(tableName = USER) data class UserEntity( @PrimaryKey @ColumnInfo(name = ID_USER) val idUser: Int, @ColumnInfo(name = USERNAME) val username: String, @ColumnInfo(name = PASSWORD) val password: String, @ColumnInfo(name = PROFILE_PICTURE) val profilePicture: String ) {...

retrofit get list of data class from data class i have to data class and one json how to get from ResponseJsonTemplates list of ResponseNomenclatureWithPriceModel if in ResponseNomenclatureWithPriceModel i have list of PriceNum data class ResponseJsonTemplates ( @SerializedName("arr") var nomList:List ) data class ResponseNomenclatureWithPriceModel ( @SerializedName("NomenclatureInfo") var dataName:DataNum, @SerializedName("Price") var dataPrice:List )

Is there any way to not use in-memory authentication? @PreAuthorize, @Secured, @RoleAllowed don't work Questions: 1.How to link Authority to annotations? Intent is to use current annotations to lock some APIs: @RoleAllowed("ROLE_VIEWER","ROLE_EDITOR"),@Secured({ "ROLE_VIEWER", "ROLE_EDITOR" }),@PreAuthorize("hasRole('USER') or hasRole('ADMIN')"). @EnableGlobalMethodSecurity(prePostEnabled=true,securedEnabled=true,jsr250Enabled=true) is used already. DB is shown below. Firebase is used to generate/authenticate. CREATE TABLE IF NOT EXISTS USER ( ID VARCHAR (50) NOT NULL PRIMARY KEY, NAME...

How do I click color to a custom spinner? Hi guys I am working on a custom spinner, which has rows of different colors, I want to press a row and it reflects a color in the textViews I work with, the problem is that when pressing one of its rows nothing happens, I have Tried with this method but it doesn't work. Example: <a href="https://www.digikey.com/es/resources/conversion-calculators/conversion-calculator-resistor-color-code-5-band" rel="nofollow...

Scanning files from device and sorting .mp3 files from it in Kotlin I am trying to create a music application in Kotlin. Currently, I have managed to play and pause a pre-defined song and also have integrated seek bar into it. But, I want to play the songs from the device local storage. So, I want to get the songs in the phone storage. I have found several solutions for it in the stack overflow but, all of the solutions are in Java. Can anyone sort it out for me? The current code I have done is package com.ashiquemusicplayer.mp3player import...

Hot to get all layes from featureserver (ArcGIS) How I can get all layers from feature server. If I use this URL for get layers: FeatureServer On this link I have this layers: My question is how to get: <a href="https://sampleserver6.arcgisonline.com/arcgis/rest/services/Sync/WildfireSync/FeatureServer/0" rel="nofollow...

Java method not available in Kotlin? I am using the ejml-library (written in Java) in a Kotlin project. I imported the library (everything seems to work fine) in IntelliJ. However, some methods which should be available (e.g. the inherited getDDRM() method of the class SimpleMatrix) are not recognized and I can't use them. Whats very weird is that the very same procedure used with Scala (also using IntelliJ) works. That is, in Scala I can access the method - with Kotlin I can't. It would be great if someone could shed some light...

Kotlin difference between CoroutineScope and withContext To change the thread in a function I use either CoroutineScope or withContext. I don't know's the difference, but with CourineScope I can also use a handler. Examples: private fun removeViews(){ CoroutineScope(Main).launch(handler){ gridRoot.removeAllViews() } } private suspend fun removeViews(){ withContext(Main){ gridRoot.removeAllViews() } } I call this function from a coroutine that works on background thread (IO). Is any more appropriate than the other?

EvictingQueue in Kotlin I need a collection that: has a fixed size is mutable will re-index elements once a new element is added, removing the oldest element (like a shift register) I think Guava's EvictingQueue and Apache Commons <a href="https://commons.apache.org/proper/commons-collections/apidocs/org/apache/commons/collections4/queue/CircularFifoQueue.html" rel="nofollow...

Flutter app crashing at start in Release mode not debug [Plugin registrant Google maps error] app crashin at start on android devices (Release.apk only nodr Debug.apk) here is a error screen hereis myapplication.kt file: @RequiresApi(Build.VERSION_CODES.O) override fun onCreate() { super.onCreate() FlutterFirebaseMessagingService.setPluginRegistrant(this) } override fun registerWith(pluginRegistry: PluginRegistry) {...

Multiple Objects in a recycler view Kotlin I would like to display 2 objects in my recycler view which will only have two cells/rows. Each row displays an object in the form of the respective layout xml file. To do this I have an adapter but I have no idea how to tell the adapter that I have two different objects to display. So I know I need two different view holders but can someone help me with the correct logic please? I have a Person object and a Car object (each with thier own xml file - using databinding) My Adapter class is as...