element is not allowed here in xml files for android studio After importing from github, all my xml files have issues saying attribute/element _ is not allowed here. The file was working fine before I uploaded it to github and after factory resetting my PC and trying to import from github I get this error. Any ideas on how to fix it?

Android Studio & Kotlin: ListView won't get fixated below app_bar using anchor in CoordinatorLayout Hey fellow programmers, there's a listView I have that I can't fixate below the appbar in a CoordinatorLayout (using layout_anchor). This is my xml: While in the layout's text editing view there seems to be no problem, in the Design view the layout_anchor "@id/app_bar" also throws the error unexpected resource type: "id" expected: string I tried changing android:fitsSystemWindows to false but this...

Draw gradually a line with Cavas How can I draw gradually a line? It needs to grow until it reaches the final Y. First I'm trying just to draw a normal line, but nothing appears when I run my app. See the code: class DrawLine(context: Context) : View(context) { override fun onDraw(canvas: Canvas) { super.onDraw(canvas) val paint = Paint() paint.color = Color.WHITE paint.strokeWidth = 2f canvas.drawLine(starOffButton.pivotX, starOffButton.top.toFloat(), starOffButton.pivotX,...

Error: Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 1 path $ on retrofit i try to catch api response with retrofit in kotlin android but always get this error Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 1 path $ i try search solution and found this but not resolve my problem this my api response and my model...

Firmware Update OTA with mobile phone (Android) over BLE to ESP32 with SD Card? How can I do firmware update (or any file/image/video) over the air using mobile phone update (eg. Android) and writing it into the external SD card of the ESP32? Also vice versa, downloading content from the SD card of the ESP32? I know that BLE is not suitable for large transfer file, but this is a part of the product requirement. What is the best way to approach this? I can't really find any resources on the internet that does this.

android: kotlin flow multiple events I am using flow in my app however I am having some issues with it hitting the logic twice with distinct or 8/9 times without it. I am using livedata as flow with databinding. xml code private val amountFlow = amount.asFlow().mapLatest { Timber.d("FLOW : amountFlow ${it}") if (it != null && it.length >= MIN_QUERY_LENGTH) { it.toIntOrNull() } else { null } }.distinctUntilChanged() this debug statement is called twice using...

Making an array of cars move to the left on a grid after a delay - Android I am trying to make cars on a grid to move after a delay using an array of i positions and j positions. What I am doing here is looping through all the boxes, finding boxes that have cars using the arrays, making them move to the left (or back to beginning if on edge of screen) and updating the positions. So far everything works until I add the delay where it crashes. var pcarsloci = arrayOf(2,2,2,8,8,8,11,11) var pcarslocj = arrayOf(0,3,5,0,3,5,2,6) k = 0 //let k...

Object received from fragment is null in the onCreateDialog method inside DialogFragment I am getting null in MyExistingComplain when i log it. But this only happens inside the onCreateDialog method. I want to update the layout of this dialog with the object values inside MyExistingComplain. Here is my DialogFragment: package com.example.atry.MakeComplaint import Retrofit.INodeJS import Retrofit.Observables import Retrofit.RetrofitClient import android.app.AlertDialog import android.app.Dialog import android.content.Context import android.location.Address import...

JPA - Cascade clears reference I am using Cascade to manage deletion of @OneToMany relation. For sake of example lets assume that there is a Work entity which contains a list of Employees. class Work( (...) @OneToMany(Cascade = [CascadeType.REMOVE]) @JoinColumn(name = "work_id") var employees: MutableList? = null ) class Employee( (...) @ManyToOne var work: Work? = null ) When I map DTO to Entity, I do not map list of Employees - this list is empty. Now let's assume I made a company...

ViewModelProviders is deprecated in 2.2.0 Currently I update androidx.lifecycle:lifecycle-extensions version from 2.2.0-alpha01 to 2.2.0and it shows that ViewModelProviders is depricated. So what is the alternative way to use ViewModelProviders in kotlin?

Why local variables could not update only when onClick invoked in MvRx When I'm using MvRx to build user profile views, it works almost fine, but one case makes me puzzle, why local variables cannot be updated when onClick invoked? In particular, when profile activity is resumed from edit name activity, views using the name are updated to the new name, but the onClick{} does not，why？ // profile activity ProfileActivity ...{ // ... inner class MyController : TypedEpoxyController() { override fun buildModels(data: MyState?) {...

Extract String in Data Class Kotlin I have a data class something like: class Person { var name: String var title: String } And I give some values which are inserted at a database using room (for example Person("John","Vicepresident") and Person("Martha","President"). I am wondering if there is any way I can extract strings like "Vicepresident" and "President" in an xml file and after that using different localization files. Extract strings usually need context which i am not able to use out of a function.

What is the different between String.toRegex() extension and Regex("pattern") I have investigated Kotlin documents but couldn't find the sensible answer about my question. When I use String.toRegex() in Android 5, getting crash for namedGroups. But if I use Regex(Pattern) there are no problem. I shuffled documents but couldnt find sensible datas. What do you think about it? What is the difference for toRegex() and Regex("pattern"). Thanks a lot.

NoSuchFieldError: Companion when using MockWebServer in kotlin only module I have a modularised project, where the api layer is separated into its own module. As this has no dependency on the Android SDK, I have made it a kotlin only module. This has the kotlin jvm plugin as shown below in the build file. This results in a java.lang.NoSuchFieldError: Companion error when I try to use MockWebServer (only this, everything else works fine). Using kotlin dsl in the build file, the build.gradle.kts file looks like this: plugins { kotlin("jvm") kotlin("kapt")...

Kotlin Polymorphisme with default value for parameter Hi i am new to kotlin and i would like to have 2 Polymorphique class with default parameter but it doesn't seem to work. Here is my code : private fun add(request: Request, share: Boolean = false, number : Int){ Do something ... } private fun add(key: String, share: Boolean = false){ Do something ... } So here is my 2 fonctions, request is OKHTTP request but it doesn't mater. Both work and compile. But my probleme is that i can't use the default value because the compilator doesn't...

Changing fragment get IllegalStateException must not be null in kotlin Hi I am getting some information from web with coroutines in my program When the information is receiving I change the fragment In this case the program crashes and the Null error takes the following options progress.isIndeterminate = false adapter = CircularAdapter(itemsData, this@CircularFragment) rc.adapter = adapter adapter.notifyDataSetChanged() swipe_refresh.visibility = View.VISIBLE lyt_progress.visibility = View.GONE swipe_refresh.isRefreshing = false This is my code I even cancel...

Coulden't Toast message in onPostExecute in asyncTask My app is crashing on Toast in OnPostExecute. I tried to put context insted of MainActivity() as Context in Toast but it's throwing same error The exception is java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference What is happening? How should I solve it? AsyncTask is in MainActivity private class InsertInDateDb(var context: MainActivity, var dateEntity: DateEntity) :...

How to configure DrawerLayout using Navigation Components I have 2 fragments where I would like to use the hamburger icon to properly access the DrawerLayout. HomeFragment and FavoritesFragment. What happens is, when I click the hamburger icon, and select favorites menu item, it navigates to FavoritesFragment, but the hamburger icon becomes a back arrow. I would like to show the hamburger icon on both fragments. This is the what I have on my MainActivity: setupActionBarWithNavController(navController, drawerLayout)...

Kotlin observeForever every time is null i'm trying realise some global object for my app and observe inside to some LiveData from my DAO. Here is how it looks: object appCommon { @Volatile lateinit var config: Config suspend fun initAppCommon() { GlobalScope.launch(Dispatchers.Main) { Database_mW.getDBInstance(AppController.appInstance).ConfigDAO().getLive() .observeForever(Observer { config = it }) } initConfig() }...

How to right the path in app.get function on rest api when my sql query has to select by two elements from the table? i'am very new in android apps developping, I am trying to do an authentification on my app using rest api but i could'nt wright the right path on my function "app.get" app.get('/getPatient2/:id_patient/',function(req,res){ var query = "select * from Patient where id_patient = " + req.params.id_patient ; connection.query(query,function(error,results){ if (error) throw error; res.send(results); }) }); Well, when i test on my browser using the path : <a...

Can't retrieve resources programatically using Kotlin So, I was trying to load a drawable programatically in my kotlin app via resources.getDrawable(R.drawable.XXX) and all I got was Method threw 'android.content.res.Resources$NotFoundException' exception. , whatever the target drawable was. After trying different things, I finally tried on a newly created Kotlin project, only to find out it didn't work either. I then created a new Java project, and everything worked flawlessly in this one. I found nothing about people having the same problem...

Cannot serve static files with Ktor I am reading the Ktor doc, and I'm trying to understand how to make Ktor serve static files. What I figure so far is this, but I don't know what I am missing ? (I get the index.html explicitly, but cannot for example get the css) @Suppress("unused") // Referenced in application.conf @kotlin.jvm.JvmOverloads fun Application.module(testing: Boolean = false) { val client = HttpClient(Apache) { } routing { // This is supposed to be it, or ? static("static") {...

manually set Firebase Firestore cache I am looking for a solution for my problem, i have a chat app which displays all the users correspondence as a Recyclerview a listener, in-order to improve user experience when a user send a message i manually update the Recyclerview with the current list plus the new message with an "uploading indication" then when the message actually uploads to Firebase the listener overrides the local list i used and updates the last message to "uploaded", problem is if i rebuild the activity the listener...

Kotlin is it possible to start an activity from a class? I am new to kotlin, i am creating a framework to handle all my api call, the problem is that it doesn't have context. I would like to start an activity when i receive a certaine call of the api but i have no activity so i can't Intent. What i have tried : val intent = Intent(this, testActivity::class.java) startActivity(intent) But it's that that i need context. I also tried to create a global Class Application with a companion object context but i get an error Required Context found...

LiveData's postValue() works just once from onCharacteristicReadRequest() method of BluetoothGattServerCallback New with LiveData and ViewModel concepts, need guidance. I override the following 2 methods (both run on a background thread) of BluetoothGattServerCallback (below snippet is part of my BluetoothModule class): private var btGattServerCallback: BluetoothGattServerCallback = object : BluetoothGattServerCallback() { override fun onCharacteristicReadRequest( device: BluetoothDevice, requestId: Int, offset: Int, characteristic:...

Kotlin Location is far from my location How can i make it more accurity private lateinit var fusedLocationClient: FusedLocationProviderClient override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val name=findViewById(R.id.editText) as TextView var text="" locationManager = getSystemService(LOCATION_SERVICE) as LocationManager? val button =findViewById(R.id.button) as Button var mainlink=""...

Kotlin: Getting the difference betweeen two dates (now and previous date) Sorry if similar questions have been asked too many times, but it seems that there's one or more issues with every answer I find. I have a date in the form of a String: Ex.: "04112005" This is a date. 4th of November, 2005. I want to get the difference, in years and days, between the current date and this date. The code I have so far gets the year and just substracts them: fun getAlderFraFodselsdato(bDate: String): String { val bYr: Int = getBirthYearFromBirthDate(bDate) var cYr:...

Equivalent of stream in Kotlin what is the equivalent of this code to kotlin? stack = stack.stream() .map(e -> // some code here) .collect(Collectors.toCollection(ArrayDeque::new)); I currently have this one stack = stack.withIndex() .map { (i, v) -> { // some code here }} .toCollection(ArrayDeque::new) I cannot resolve the ArrayDeque::new part. How to do this in kotlin? Update this is my original code and im working for a stack using ArrayDeque, I need to update the stack on specific...

How do I set a Content Type Charset in Ktor client (Not an accept charset) A beginner here, Is there any other way of adding Content-Type Charset instead of doing header("Content-Type", "application/json; charset=UTF-8") ? val client = HttpClient { Charsets { Charsets.UTF_8 } // This sets the accept header only, does not set the content type charset } client.put { contentType(ContentType.Application.Json) url(url) body =body } This however works client.put {...

Android: On BackPressed Fragment doesn't load content so, I'm using the Android Navigation component inside my project. I have an Activity with 3 fragments that load perfectly and do everything they need to do. The problem is with one fragment that doesn't load its content when its returned to from backstack. I'm using navigate functions declared in the ViewModel with Directions from the Navigation. example ( vm.navigate(SomeFragmentDirections.actionSomeFragmentToOtherFragment) A(activity) -> B(fragment) -> C(fragment) -> D(fragment) when I...