Why parent of fragment is null after pause? I return to app after a long time pause in background, it crashing with null point exception when try to cast view.parent as View. Why fragment don't have parent after pause? class ToolboxSheetFragment : Fragment(R.layout.fragment_toolbox_sheet) { private lateinit var behavior: BottomSheetBehavior override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) behavior = BottomSheetBehavior.from(...

Pass null value when method declaration creates an empty map - input: Map<String, String> = emptyMap() in the interface - Kotlin I have an interface with following declaration. interface makeItHappenInterface { fun methodOne(params: Map = emptyMap()):Boolean } I want to call this method but the params sometimes could be null. .... var extraDtls = calculate(val1, val2) makeItHappenImpl.methodOne(extraDtls) // error in above line saying ---- Type mismatch. Required: Map Found: Map? so how to handle above error? should I change the method declaration in interface? or any other technique to fix this...

"Can't access ViewModels from detached fragment" on interface onclick I'm getting error "Can't access ViewModels from detached fragment" when onClick method implemented by AirportOnClickListener try do do anything with viewmodel (trigger event, set var etc). What's wrong with my code? I'm using hilt for DI @AndroidEntryPoint class SearchFragment @Inject constructor() : Fragment(), AirportOnClickListener { @Inject lateinit var adapter: RecyclerViewAdapter private var _binding: FragmentAirportSearchBinding? = null private val binding get() = _binding!! private...

How to add values from one to another data class? is it actually possible to connect two data classes by ID and then copy a value if IDs are equal?? data class Discount( val ID:String,val discountPrice:String) data class Catalog( val ID:String,val price:String, name:String, desc:String, discountPrice:String?) Catalog has over 4000 items and I need to copy discountPrice from Discount class to that Catalog..

java.lang.RuntimeException: Cannot create an instance of class When I start my app, it run fine without error but after run app is crashed everytime.and show logcat Messages com.example.weatherapp, PID: 15301 java.lang.RuntimeException: Cannot create an instance of class com.example.weatherapp.Presentation.WeatherViewModel at androidx.lifecycle.ViewModelProvider$NewInstanceFactory.create(ViewModelProvider.kt:204) at androidx.lifecycle.ViewModelProvider$AndroidViewModelFactory.create(ViewModelProvider.kt:322) at...

How to write Windows registry while installing MSI package written in Kotlin Compose for desktop? I'm getting stuck at trying to write the windows registry entries while installing the MSI package which is written in Kotlin Compose for desktop. Anyone can share experiences please? Thank you.

unexpected error during building android project. How to fix it? java.lang.ClassFormatError: StackMapTable format error: reserved frame type at org.jetbrains.kotlin.resolve.calls.components.ClassicTypeSystemContextForCS.argumentsCount(ClassicTypeSystemContextForCS.kt:23) at org.jetbrains.kotlin.types.model.TypeSystemInferenceExtensionContext$DefaultImpls.extractTypeVariables(TypeSystemContext.kt:260) at org.jetbrains.kotlin.types.model.TypeSystemInferenceExtensionContext$DefaultImpls.extractTypeVariables(TypeSystemContext.kt:276) at...

Suggest me a reference for learning Kotlin , Java I really want to learn application programming and I have prepared tutorials in my own language, but all of them are not at the beginner level and have not fully explained. I want a reference to teach programming to a beginner Something that explains the code line by line and tells what it is used for Please suggest me all the sites that have training And that my second language is English, and it would be better if the lessons were free And that I am taking kotlin, I want to master...

the maxInMemorySize value of config is not being set on every Jackson2JsonDecoder In our Webflux application we get an incoming request, of which the payload size can be bigger than the 256kb Jackson2JsonDecoder default. There is an config value we set like: spring: codec: max-in-memory-size: 20MB This seems to work on certain Jackson2JsonDecoder, but not on all, see screenshot of debug session: Right now, we can't seem to set the maxInMemorySize value on the Jackson2JsonDecoder our...

What is the proper way to use EditText content change listener? Am trying to do something when my EditText content is changed. Here is 3 ways i find to do it. 1. edittext.addTextChangedListener { //my code } edittext.doAfterTextChanged { //my code } edittext.addTextChangedListener(object : TextWatcher { override fun afterTextChanged(s: Editable) { //my code } override fun beforeTextChanged(s: CharSequence, start: Int, count: Int, after: Int) {} override fun onTextChanged(s: CharSequence, start: Int, before: Int, count:...

E/RecyclerView: No adapter attached; skipping layout in my fragment I can run this and I also got data appear but I got this warning on my Run terminal "E/RecyclerView: No adapter attached; skipping layout No adapter attached; skipping layout" How can I solve this class SpacedFragment : Fragment() { private lateinit var kanjiViewModel : KanjiViewModel private lateinit var spacedRecyclerAdapter : SpacedRecyclerAdapter private lateinit var day1Adapter: SpacedRecyclerAdapter private var _binding : FragmentSpacedBinding? = null private val...

How to make animated vectors start on their own in Jetpack Compose? The problem i have is that i can render SVGs but i can't make them automatically start, i've seen examples where with the onclick method i could start the svg but i'd need it to automatically start without any user action, is it possible? I used this documentation but it only rembers the svg https://developer.android.com/jetpack/compose/resources#animated-vector-drawables...

Google and Facebook Login Error in webview Kotlin App I am using Webview to turn my responsive website into a native app. All the things are working fine the thing is whenever I try to login with Facebook or Google they give an error some attachment put down anyone can help me out with this problem. Advance thanks

Best Practise of Kotlin serializable in kotlin Hey I am new is serializable in kotlin. I am reading through documentation. I get the basic idea from this. I want to learn best object oriented practise how to make write good code. I have this data coming from server. { "TopicOne": [ { "id": 1, "seconds": 5.856, "date": "21/10/2010" }, .... // more data...

Translate the following query in spring boot jooq query builder I have the following query: SELECT COALESCE(t2.name, t3.name) as name FROM table1 as t1 LEFT JOIN table2 as t2 ON t1.id = t2.id LEFT JOIN table2 as t3 ON t1.id2 = t3.id2 So I want to translate the above into jooq query builder! I did the following, but not sure if that is right or not: dbReader.select( t.name ).from(table1).leftJoin(table2).on(table2.id.eq(table1.id).or(table2.id2.eq(table1.id2)) something like that... Is that correct? Or there is a better way !

How to implement increase/decrease or manual change White Balance (Temperature and Tint) in CameraX API using kotlin? I have developed brightness or exposure which increases and decreases successfully on the slider, Now I have to develop same for white balance according to temperature increase and decrease the temperature with the help of slider NOTE:- brightness and white balance are different things @SuppressLint("UnsafeOptInUsageError") private fun Slider.setup(camera: Camera) { camera.cameraInfo.exposureState.let { value = it.exposureCompensationIndex.toFloat()...

Map table returned by function to JPA projection interfaces Let's say I have a interface SampleOverviewProjection { val id: Int val code: String val creationDate: Date val fooId: Int val barId: Int? val bazId: Int? } Where Sample, Foo Bar and Baz are more or less unrelated entities (inasfar as database relations are concerned) that are collected onto this Overview because the client wishes it. Because the query that connects them is somehow convoluted, we want to defer the logic that fetches the overview to the database, where...

KotlinPoet: how to generate a DSL with parameters I'm trying to generate this Kotlin code that contains a DSL with a parameter: listOf( navArgument(QUERY_PARAM) { type = NavType.StringType nullable = true defaultValue = null }, ) Is there a better way to provide the parameters to the DSL than just build the string manually? CodeBlock.builder() .addStatement("listOf(") .indent() .beginControlFlow("%M(${queryParam})", MEMBER_NAME_NAV_ARGUMENT) .addStatement([...]) .endControlFlow()...

Custom JWT Auth with Spring Webflux I'm trying to setup authentication with JWT with Spring Security inside a Spring WebFlux application. I'm using a custom authorization scheme based on custom JWT claims. The problem I'm having is that when I try to invoke a secured endpoint authentication fails with Authentication failed: An Authentication object was not found in the SecurityContext. Here is the SecurityWebFilterChain I'm using: @Configuration @EnableWebFluxSecurity @EnableGlobalMethodSecurity(prePostEnabled = true) class...

How to render specific block styles in java.awt.Graphics2D for an open-source QRCode library? I am writing an open-source library for the rendering of QR codes in Kotlin. I want to offer at least the styles of codes that are offered in https://www.qrcode-monkey.com Take a look at the body shapes, eye frame shapes, and eye balls shapes on their web pages. I am not a graphics person and don't have extensive experience with AWT. Is anyone able to help me with the code that would generate a similar look for those...

Can you help me fix an error when creating a pdf file using kotlin I need help creating a pdf file I downloaded this code from the Internet and when running, this error occurs Where is the problem please? kotlin code import android.Manifest import android.content.Context import android.graphics.Bitmap import android.graphics.Canvas import android.graphics.Color import android.graphics.Paint import android.graphics.pdf.PdfDocument import android.os.Bundle import android.os.Environment import android.util.DisplayMetrics import android.util.Log import...

Fatal Exception: java.lang.IllegalStateException kotlin.Unit coroutines Anyone has a clue on how to solve this. I have check online but no helpful resources. internal fun initialize(args: Map, completion: () -> Unit, error: (Exception) -> Unit) { // it crash at this point coroutineScope.launch { //I have some code here } } Fatal Exception: java.lang.IllegalStateException: kotlin.Unit at com.client.onenn.onenn$initialize$1.invokeSuspend(onenn.kt:70) at...

android. kotlin, the coverage test is failing on lateinit var member in android kotlin class it has a lateinit var member. The coverage test is failing on the function referring to it. The simplified class here: open class TestC constructor(context: Context) { private lateinit var mModule: NotificationModule protected fun setModule(module: NotificationModule) { mModule = module } protected fun getModule(): NotificationModule { return mModule } fun doSomething() { if (mModule.pushToken == null) {...

Running a foreground service in android kotlin to show notifications every minute through out the day using handler and runnable Running a foreground service in android kotlin to show notifications every minute through out the day using handler and runnable .Get the notification when i run the below code but after sometime the notifications stops. If the phone is in locked state and if i unlock it ,the notification starts coming but again stops after sometime. Please help me with this. ''' class MedTimerService : Service() { private val FOREGROUND_NOTIFY_ID = 5051 private val TIME_GAP_FOR_NEXT_MEDICATION = 24 * 60 *...

How to know pattern of string date in kotlin I want to convert in ZonedDateTime. How can I recognise pattern to pass in DateTimeFormatter.ofPattern(????????). val string = "May 9, 2020 8:09:03 PM" private fun getFormatDate(date: String): ZonedDateTime { val dateTimeFormatter = DateTimeFormatter.ofPattern(????????) return ZonedDateTime.parse(date, dateTimeFormatter) } Many Thanks

Kotlin Client,Python Server Socket Server receive data loop code can't exit What I'm trying to make is that if the Kotlin client sends the image to the Python server, the Python will Grayscale the image and send it back to the client But there's a problem with the server, recv image data loop doesn't end How should we solve this problem? Here is the code Kotlin Client class MainActivity : AppCompatActivity() { var ip = "35.216.104.58" var port = 4000 val binding by lazy { ActivityMainBinding.inflate(layoutInflater) } override fun onCreate(savedInstanceState:...

How to read QR codes with colors using zxing in kotlin and Jetpack Compose I am using zxing in kotlin to read QR codes, and it works great, however I want to read QR codes with colors and it doesn't work, only black and white, how to do this? this one reads it well, this cannot be read, CaptureActivityPortrait.kt class CaptureActivityPortrait: CaptureActivity() { } AndroidManifest.xml .......

How to force bottom Navigation to start nested graph navigation from the startDestination? I have a simple toy app that works on one mainActivity. It has a bottom navigation bar with separate nested graphs. For instance, the navigation graph "notification" has an additional destination to settings. If I move to "notification" >>> "settings" >>>> to "home"/"dashboard" nested navigation and get back to "notification", it will show the most recent state of nested graph, which is "settings". How to make the bottom navigation to get to the startDestination, which is "notification",...

App process does not die when stopping a bound foreground service I have a bound foreground service that is supposed to live even when the app is removed from recents, but with the option to also stop the service when the app gets removed. That optional path is what I am having trouble with. If the service is not set as foreground, stopping the service causes the process to die as well. This is the desired effect: However, if the service is set as foreground, the app process does...