kotlin, android: draw single pixel from byte-array I'm trying to code a little game containing a self-designed GUI, with the goal of teaching myself android-kotlin. I have figured everything out, except of getting my pixels from an unsigned-byte-array to the screen. The Problem: the .drawRGB(r,g,b) method does colour the whole canvas instead of a single pixel, I need a way to manipulate a single pixel, a method something like .drawSinglePixelRGB(r,g,b,xpos,ypos), but after two hours of research I am still stuck. My current project structure...

koltin enum generic function I need a Kotlin function to return an enum value from a string when given a default value for the enum. Each enum class has a valueOf() method, but I am after a generic that works for any given enum class. For a sample enum I can do: enum class Example { first, second, third ; companion object { // Note same exact code also works if not in companion object fun valueOrDefault(value: String, default: Example) = try { valueOf(value) } catch (e:...

How do I wait for the Firebase DB to finish loading? [duplicate] I have a problem with preloading a DB, from which a list is created and then should be displayed in a fragment. If I run the function and wait a few seconds, then everything is ok (for example, start the function at the moment mineActivity starts and then call the fragment where the list is displayed). But I would like to run the function every time a fragment with this list is called, but I don't know how to track the filling of the list and the completion of receiving information from the...

How to detect if any video in playing by any app on android device? I'm trying to detect playing video in background service on android included playing video with default media player,browser, messenger and ... is there any solution to do that?

How to implement partial content on spark-java framework webserver to allow download pause/resume support I have embedded sparkjava framework webserver in android to list device files on webpage which can be access on desktop browser connected to the same android hotspot running webserver. I have added several header like Accept-Ranges, Content-Length and Content-Range but I don't know how to work with range. Files are downloading with no resume support, what I want to do is allow download managers to download files in parts/chunk.

Multiple files are not getting copied to local directory in Android I am using below code to save image data into local directory from Uris obtained through pick intent. private fun sendImages(uriString: String, messageBody: String, uriList: ArrayList) { val pathList = mutableListOf() val fileNameList = mutableListOf() var fieSize = 0 var multiSize = 0 if(uriList.isEmpty() && uriString.isNotEmpty()) uriList.add(Uri.parse(uriString)) val localId: String = "localId" for(i in 0 until uriList.size) {...

Problem with specific code in Kotlin : Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 75 path $.data I have a probleme right now. I'm trying to fetch data from an api rest WebSite Url, i've made all the things i was needed to do, but it doesn't working. I don't know what is this problem, thank's for helping me Error : Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 75 path $.data AllClass.kt import com.google.gson.annotations.Expose import com.google.gson.annotations.SerializedName class ClassVal { @SerializedName("pagination") @Expose var pagination: Pagination? =...

Spring cloud stream with kafka streams binder: how to set `trusted.packages` to all? I have a simple stream processor that looks like this (Kotlin) @Bean fun processFoo():Function { return Function { input-> input.map { key, value -> println("\nPAYLOAD KEY: ${key.name}\n"); println("\nPAYLOAD value: ${value.address}\n"); val output = FooAddressPlus() output.address = value.address output.name = value.name output.plus = "$value.name-$value.address" KeyValue(key, output) }} } These classes FooName, FooAddress and...

Firebase Firestore Kotlin Quizz QuestionList I have question and problem. I want to create quizz with connecting firestore firebase. I create database with example question. How can I make the next question appear when I click on a question? What do i need to do first? There will probably be a loop somewhere. Do you list the values ​​from the firestore to and on the basis that it will be randomized? val db = FirebaseFirestore.getInstance() val docRef = db.collection("quizz").document("question1") docRef.get() .addOnSuccessListener {...

How to send complex model with files in flutter via chopper to spring Assume we are creating a social network site. I try to send a model that contains multiple comments each comment could contain multiple files. MainModel List comments; String uid; .... //other properties here Comment class should look like: String comment; List attachments; ... other data of comment The question is: How to send this MainModel via flutter (chopper lib) and receive it in spring boot. I saw threads where people just send a simple file with flutter to spring boot, but never...

What is the difference between Sealed class and inheritance principle in Kotlin? I'm new with Kotlin. I'm reading a book and a sealed class is displayed there as an "extension" of Enum. I can't see the similarity between them. The way I see the things, Sealed class is more related to inheritance, because each class can inherit from it and to add function and properties to it For example: sealed class messageType class MessageSuccess (var msg: String) : MwssageType() class MessageFailure (var msg: String, var e: Exeception) : MwssageType() I don't see here values like we...

Yandex Metrica doesn't show crashes and users I want to use Metrica instead of firebase and config it completely but it doesn't track any crashes or users in dashboard. Codes : https://gist.github.com/alirezanazari/cecec7f8d4231d04ad9a121137e98b16 and also gradle dependencies config: appmetrica { postApiKey = "dashboard key"...

Is there a way to optimalize this better? Is there a more optimized/efficient way to do this? Tried some things, this seems right, but better to know if there is a better way of doing this. This is for my discord bot, command called "8ball" where you ask bot a question, and he replies with random reply. val num = Random.nextInt(1, 9) var text = "" when (num) { 1 -> text = "Yes" 2 -> text = "No" 3 -> text = "Maybe yes" 4 -> text =...

Optimising a repeating code in when expression Kotlin One of my methods returns a boolean value according to the elements of a list whose size can go from 0 to 4. I used a when expression, but the "problem" is the repetition (redundancy) of my code. Here it is: list.apply { return when (size) { //size in 0..4 0 -> false 1 -> get(0) == 9 2 -> get(0) == 9 || get(0) == get(1) || get(0) + get(1) == 8 3 -> get(0) == 9 || get(0) == get(1) || get(0) + get(1) == 8 || get(0) == get(2) || get(0) + get(2) == 8...

OpenGL ES 2 - Textures Are Not Displayed Before I refactored the code to display multiple different textures everything was working fine but now all I am getting are black boxes that are smaller than how their size supposed to be and obviously they don't have any textures! I didn't even touch the vertexes, I don't why the size is affected at all. Screenshot (the black big box should've covered the whole screen and the small square at the bottom should've been way bigger. Have no clue what affected their size):<a...

Why do I get the error E/RecyclerView: No adapter attached; skipping layout? I'm trying to use recycler view in my android app but I keep getting the error in the title. I searched a lot about this error but I can't seem to fix it. Most people say it's usually a silly mistake but I just can't find it. Here is my code: class PostsActivity : AppCompatActivity() { var recyclerView: RecyclerView? = null var postObjList : ArrayList? = null var postContentList : ArrayList? = null var viewModel : PostsViewModel? = null override fun...

Why isn't my delete .kml method channel working? Here are my futures: Future addKml(GoogleMapController mapController) async { const MethodChannel channel = MethodChannel('flutter.native/helper'); try { int kmlResourceId = await channel.invokeMethod('KML'); return mapController.channel.invokeMethod("map#addKML", { 'resourceId': kmlResourceId, }); } on PlatformException catch (e) { throw 'Unable to plot map: ${e.message}'; } } Future deleteKml(GoogleMapController mapController) async {...

Kotlin, do a get request and parse Json response Can someone help me to correct and continue my code? I aim to send a get request and parse the json response. And How can i use a var outside the {} val productUrl = "https://...../product/$resultBarcode.json" productUrl.httpGet().responseString { _, _, result -> var data = result.get() } println(data)//Why I cannot read my var data? It's red Thanks

How to migrate this Realtime Database example code to Firestore Database Kotlin RecyclerView I was trying to migrate one example project "X" to see how it works somehow, but i did find a wall trying to put works the methods into: private fun retrieveUsers() { val users = FirebaseDatabase.getInstance().getReference().child("Users") users.addValueEventListener { object : ValueEventListener { override fun onDataChange(dataSnapshot: Datanapshot){ if(view?.search_edit_text?.text.toString() == ""){ mUser?.clear()...

Spring boot best approach for managing unhandled bookings I am in the process of developing a hotel booking system with a spring boot backend. Once a customer places a booking, the booking will be saved on the database with the status - "new" and there is an API endpoint available for the hotel's internal system to poll new bookings. Once the bookings are pulled, the hotel's system will mark the status of the booking as "confirmed" via the API. All this is working fine, however now I need to implement a way for both the hotel and the admins to be...

How to create a custom layout context for "exit" selection How to create an Exit selection Custom Layout XML and show it as popup on the main activity when a user clicks exit button ? button_exit.setOnClickListener { ... } Kotlin is preffered.

how to update selectionTracker when adapter is renewed? I've implemented a tracker to my recyclerView, and it works fine. my problem is when I add some items to my recycler or even renew the whole adapter, the tracker won't work. the crash is out of range for returning key from dataArray which is passed to ChatItemKeyProvider in the creation of SelectionTracker the code for getKey is this: @Nullable override fun getKey(i: Int): String { return mPokemonList[i]!!._id } what I've tried so far: everyTime I add some data to my adapter,I set...

I want to trigger OnScrollChangeListener for certain space scrolled I have a scrollView that needs to hide a keyboard when I drag certain Y offset , currently it will always close my keyboard when I enter an edittext but what I want to do is to execute the hideKeyboard() when for example the view has been scrolled Y units binding.scrollView.setOnScrollChangeListener { view, i, i2, i3, i4 -> hideKeyboard() } I want to add a condition like this binding.scrollView.setOnScrollChangeListener { view, i, i2, i3, i4 ->...

how access folder specific app android studio I have the following code with which to access a specific folder of the external storage, the question is how I can do the same but for a folder of my internal storage application val rootPath = "content://com.android.externalstorage.documents/document/primary:" val samPath = Uri.parse("$rootPath${Environment.DIRECTORY_DOWNLOADS}%2fajua") val REQUEST_CODE_PICK_FILE = 1 val intent = Intent(Intent.ACTION_GET_CONTENT) intent.type =...

Android - How to change app language by user and save changes forever? I was searching for how to change an android app language programmatically and the way that I got is the following way: Locale myLocale = new Locale(lang); Resources res = getResources(); DisplayMetrics dm = res.getDisplayMetrics(); Configuration conf = res.getConfiguration(); conf.locale = myLocale; res.updateConfiguration(conf, dm); And as you know the above solution is not a great one. It was really buggy and the changes just saved in the activity that code run and in addition the...

Android DialogFragment getDialog() and getView() returning null I've got a DialogFragment that I need to show from a Fragment. This is my DialogFragment: class MyDialogFragment : DialogFragment() { companion object { @JvmStatic internal fun newInstance(): MyDialogFragment = MyDialogFragment() } override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? = inflater.inflate(R.layout.my_dialog_fragment container, false) override fun onViewCreated(view: View,...

Spring cloud stream with kafka stream binder: using TopologyTestDriver I get the error of "The class is not in the trusted packages" I have this simple stream processor using kafka streams binder. @Bean fun processFoo():Function { return Function { input-> input.map { key, value -> println("\nPAYLOAD KEY: ${key.name}\n"); println("\nPAYLOAD value: ${value.address}\n"); val output = FooAddressPlus() output.address = value.address output.name = value.name output.plus = "$value.name-$value.address" KeyValue(key, output) }} } I'm trying to test it using the...

Call startActionMode from a fragment I'm tring to launch contexual action mode menu from a fragment when a button is clicked. I'm not sure how to call "startActionMode()" from an onClick method in my fragment. MyFragment class MyFragment : Fragment() { ... private var mActionMode: ActionMode? = null // when this button is clicked it should launch the Contextual Action Bar (CAB) fun myCAB() { // Check to see CAB is currenty active. if(mActionMode != null) return...

Correct kotlin syntax for onErrorResume with two arguments How to properly translate some java code like the following into Kotlin: Mono mono = ... Mono x = mono .onErrorResume(BadJOSEException.class, e->Mono.error(new RuntimeException())) OnErrorResume comes from Spring Reactor and is defined as follows: fun Flux.onErrorResume(exceptionType: KClass, fallback: (E) -> Publisher): Flux //Extension for Flux.onErrorResume providing a KClass based variant. I tried several options, but all give compilation errors, and Intellij is also not...

Building non-blocking VertX server with CoroutineVerticle I'm experimenting with VertX+Couroutines and just want to check if this setup is blocking at any point or has potential issues that i need to be aware of. For example, is runBlocking being used correctly in this instance or should i rather do a deployVerticle? And then inside requestHandler, i'm doing GlobalScope.launch, this seems to be discouraged, what is the correct scope to use here? I've added VertX 4.0.0-milestone5 to my Gradle build script, i'm not using VertX Web: val...