Specify class fields to be serialized to JSON in Ktor Serving JSON content in Ktor as described in HTTP API - Quick Start - Ktor, as shown in the examples, works for common collections (lists, maps, etc.) and data classes. However, if I want to serialize a class that is not a data class and has fields that I want to exclude, how do I specify the fields to be serialized and their serialized names? Assume that I am using Gson, can I do it in the...

How to wait in Android while the data is being downloaded from Cloud Firestore? I want to download a small document from Cloud Firestore. This is my code: private fun getCoursesIndexDoc(): Boolean { // fetch the index document var docFetched = false var processCompleted = false db.document("all") .get() .addOnCompleteListener { task -> if (task.isSuccessful) { docFetched = true // get doc contents } processCompleted = true } // show progress dialog //...

How to add a message to EditTextPreference? I've extended EditTextPreference so I can customise it: class DeleteAccountPreference(context: Context, attrs: AttributeSet) : EditTextPreference(context, attrs) { override fun setDialogMessage(dialogMessageResId: Int) { super.setDialogMessage(R.string.delete_account_message) } override fun onBindViewHolder(holder: PreferenceViewHolder?) {...

Android waiting for listener freezing the app? I want to show a progress dialog and dismiss it after the onCompleteListener has responded as follows: class DialogSubjectsAdd: DialogFragment() { private val db = FirebaseFirestore.getInstance().collection("courses") private var docFetched = false private var processCompleted = false override fun onCreateDialog(savedInstanceState: Bundle?): Dialog { super.onCreateDialog(savedInstanceState) getCoursesIndexDoc() // show progress dialog //...

Change dialogMessage color I have a custom preference which extends EditTextPreference: class DeleteAccountPreference(context: Context, attrs: AttributeSet) : EditTextPreference(context, attrs) { ... } preferences.xml Which I have applied a custom theme to: styles.xml ... @style/AlertDialogTheme @color/colorIcons @color/colorLightBlack @color/colorAccent @color/colorExit @color/colorAccent #000000 @color/colorPrimary <a...

Why RawQuery in SQLite works only without Question Mark (Kotlin) This is the structure and data of my table funco inside database your.db (SQLite): Id Disp Tp 1 Ball 2 2 Light 1 3 Sea 4 This is my code: var db = SQLiteDatabase.openDatabase(this.filesDir.path + "/your.db",null, SQLiteDatabase.OPEN_READWRITE) val c = db.rawQuery("Select Id, Disp, Tp From Funco Where Id

Marker not very responsive to drag I am using Google Maps to set the location choice of the user. The user can drag a marker to set the position on the map. What I find is that it is extremely difficult to make the marker move. Let me first show the small code that I have: mMap.setOnMarkerDragListener(object: GoogleMap.OnMarkerDragListener { override fun onMarkerDragEnd(p0: Marker?) { if (p0 != null) { newlat = p0.position.latitude newlong = p0.position.longitude...

Retrofit pass String to url How can I pass the variable day by pressing a button to the apiInterface class? The fragment FragJornadas, from where I want to pass the variable to @Get in Interface? class FragJornadas : Fragment() { var jornada = "1" var dataList = ArrayList() lateinit var recyclerView: RecyclerView override fun onCreateView( inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? { // Inflate the layout for this fragment val view =...

Type mismatch: inferred type is Fragment but YouTubePlayerSupportFragment was expected I keep on getting this error since I upgraded my Android Studio. Here's my activity_main.xml (Relevant part) Here's my MainActivity.kt lass MainActivity : AppCompatActivity() { lateinit var youTubePlayerSupportFragment: YouTubePlayerSupportFragment lateinit var youTubePlayer: YouTubePlayer override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) initializeYoutubePlayer() }...

Casting to class extending a class I'm trying to fetch a class via name. I know that this class will extend my Event class. For further generic things I need the system to know that the class is a child class of Event. With Java I would probably cast it to something like Class, but how do I do this with Kotlin? My current code is: Class.forName(eventClass) as Class // The as should cast to Class extending Event I tryed things like T: Event or ?: Event

Passing Events Back to the Dialog's Host in Android crashing the app? I am trying to implement a dialog by following the guide given at https://developer.android.com/guide/topics/ui/dialogs#PassingEvents. I want to implement two events, onCancel and onDismiss. The dialog is a progress dialog. The problem is the app stops working when I click the menu item to show the dialog. This is Dialog code: class DialogSubjectsProgress: DialogFragment() {...

confilct version dependecy in android Gradle I need to add dependency RESTMock, but I get this error in Gradle. project :app > com.github.andrzejchm.RESTMock🤖0.3.3 > com.github.andrzejchm.RESTMockcore0.3.3 > com.squareup.okhttp3okhttp tls3.13.1 but I use com.squareup.okhttp3okhttp tls3.12.1 in project. I need version 3.12.1 and RESTMock together, anyway can I have together?

"Text-to-Speech " i need to build function same the one in ezPDF android app "Text-to-Speech " i need to build function same the one in ezPDF app need to use Text-to-Speech class when click on specific text in pdf ex: have line "Hi i'm Mahmoud , i work android developer" when clicked on my name or my job take word to use it in class "Text-to-Speech"

Can we implement lateint var check on a member variable of my custom class? It works on variables created , not on my custom class data members, as it contains some lateint variables. I have tried this : if(:: responseObject.docFront.isInitialized) this is not working, complilation error. responseObject

How use Kotln class in Java class in spring boot 2? I create a spring boot project from spring boot starter with bellow configs: Language: Kotlin Spring Boot: 2.2.0 M3 Packaging: war Java: 12 Now I add 2 simple classes as follow: class KotlinModel( var name: String = "", //var model: JavaModel ) class JavaModel { private String name = ""; //private KotlinModel model; } When I uncomment //var model: JavaModel, The project compile successfully, But when I I...

How to import own class in test - kotlin I want to add some tests to my project, but I don't see my classes. Why? @RunWith(SpringRunner::class) @SpringBootTest @DirtiesContext @EmbeddedKafka(partitions = 1, topics = [ServiceControllerTest.EXAMPLE_TOPIC]) class ServiceControllerTest { @Autowired lateinit var receiver: Receiver } E.g.: I can't import and use Receiver.

Gson.toJson() vs JSONObject.toString() Will #1 and #2 always produce the same output? What are the advantages of using one solution over the other one? Solution #2 looks cleaner and simpler to me, is it faster also? //#1 val gson = Gson() val j = JsonObject() //com.google.gson j.add("foo", gson.fromJson(getBar(), JsonElement::class.java)) val jString = gson.toJson(j) Log.d(TAG,jString) //#2 val j1 = JSONObject() //org.json j1.put("foo", getBar()) val jString1 = j1.toString()...

Kotlin: variadic (auto-infer) type arguments possible? I understood how basic type inference works in Kotlin, but i wonder if i can only call a function with either all type arguments or none of them, or if i can define variable type arguments somehow; EG: fun foo(t:SomeTuple?=null) = doSomething(t) this function can either be called via foo(someTuple) or foo(), while it's clear that the first two type arguments are inferable from the last; Is it possible to do something like foo() and still be able to infer and use A and B inside the...

show existing navigation menu connected to one activity in another activity I am in the process of building an app, and have a navigation menu in my first activity, however when i go to the second it doesn't show, so which bits of code do i copy from my first activity for the navigation menu to show there too? I have tried to copy what i thought was relevant bits of code from the first activity into the second, however that second activity crashed, so i tried to remove that added code, and failed to reverse it, so i imported the code from a backup to get it working...

retrofit dynamic fields alongside normal fields in single json object In my android app, I am using retrofit to call the API and cast the response json to My Class. I am okay with simple responses but one of them contain dynamic fields (which need to be gathered in a list or map). A sample of result json is something like this: { "_id":"id", "name":"somename", "paths":[ { "_id":"path id 1", "path":"path 1" }, { "_id":"path id 2", "path":"path 2"...

Kotlin - Generic function references Given the following class class Foo { fun bar() {} } I can reference the bar function like so Foo::bar I want to be able to do this for generic functions class Foo { fun bar() {} } But the compiler throws the following error Kotlin: Type inference failed: Not enough information to infer parameter T in fun bar(): Unit Please specify it explicitly. How can I provide the parameter for generic function references? Workaround The only thing I've been able to do is proxy...

how to fix this error : Could not get resource recyclerview v7 i want to use recyclerview and card view and i dont know why i am gettin this error when i add libraries that i need here is my dependencies in build.gradle dependencies { implementation fileTree(include: ['*.jar'], dir: 'libs') implementation "org.jetbrains.kotlinkotlin stdlib jdk7$kotlin_version" implementation 'com.android.supportappcompat v728.0.0' implementation 'com.android.support.constraintconstraint layout1.1.3' implementation 'com.android.supportsupport v428.0.0'...

TornadoFX unresolved JavaFx I wanted to create a new project that should be a desktop application. For this purpose, I have selected Kotlin language and TornadoFX framework. I have installed the TornadoFXplugin and created a new Ttornadofx-gradle-project. The base setup made by Intellij was successful but I have encountered a problem. When I wanted to run the generated project it failed. The project cannot resolve the java fx. I have dug through the web and found nothing that would fix the problem. The error log that I...

Android: error: annotations are not supported in -source 1.3 I've tried to add some modules, and when i rebuild the project i got this error: error: annotations are not supported in -source 1.3 (use -source 5 or higher to enable annotations) i'v deleted the modules, but the error is staying. tried clean and rebuild, didn't help. i understood it something to do with the java maven, but i didn't understand how to solve it. Maybe someone here could help? this is my Gradle: buildscript { ext.kotlin_version = '1.3.31' repositories { google()...

Kotlin - KFunction1..KFunction(n) unresolved reference The following function resolves to KFunction2 fun foo(a: Long, b: Boolean): Int { ... } I've tested this using val function = ::foo KFunction2 But when I do this val function: KFunction2 = ::foo I get an unresolved reference for KFunction2 My build.gradle includes a dependency for kotlin-reflect implementation "org.jetbrains.kotlinkotlin reflect1.2.71" Do I need another dependency to resolve the reference to KFunction2? Note same applies for KFunction1, KFunction3, etc.

Cannot create an instance of an abstract class error when using random in Android Studio I am currently following an Udacity course and the task is to create an app that rolls dice. When I try to use Random() I get this error "Cannot create an instance of an abstract class" I've already tried to ask the maker of the course and she hasn't responded yet so I'm trying this because I'm impatient val resultText: TextView = findViewById(R.id.result_text) val randomInt = Random().nextInt(6)+1 resultText.text = randomInt.toString()

Dialog Fragment can't pass back events to calling Fragment in Android? In my Android App, I have navigation drawer activity as the MainActivity. And I do not intend to do any tasks in the MainActivity other than navigation, I want to keep it simple and use Fragments for my tasks. So I have a Fragment which calls a DialogFragment, the DialogFragment passes back events to the Fragment. My implementation is similar to the code given here in the docs. But,...

Easiest way to parse individual query parameter data from an API URL on Android Kotlin From my Android app, I need to get the exact value from some API endpoints with this format: https://demo.com/api/v1/?msg=Thank+you!+Your+files+were+submitted+successfully!&amp;status=Successful What's the best way to fetch "Thank you! Your files were submitted successfully!" to show using Kotlin? Special notes to add: There's one way of getting the Query which is android.net.URI.getQueryParameter(). But it carries a bug of not being able to parse + or special characters in values to a space...

Android: Can't initialize object parser for b.a.a.a.e.a, no acceptable constructors found I'm getting up with a problem when I deployed my application into PlayStore. Everything works fine in emulator, until I deployed it into PlayStore. The application crash, and when I open it with my LogCat it say, "Can't initialize object parser for b.a.a.a.e.a, no caccepatble onstructors found". What should I do and how I fix it? Thank you.

FragmentTranscation within a RecyclerView.ViewHolder I have a complex RecyclerView.ViewHolder. Given that my app is targeted at tablets there's more space that allows for more complexity in the UI. When the user clicks a button inside that ViewHolder, I have to display another RecyclerView inside the ViewHolder. Given that the secondary RecyclerView is only needed when the user presses the button I don't want to load it immediately but seperate it out into a Fragment that will only be loaded when the user clicks the button within the...