I have the download URLs of my Firebase images, and I want to convert those to references to the images in the cloud. Is there a clean way to do so? The end objective is to delete those images, if that matters, and I have a StorageReference to my images folder in Firestore in the same scope. Here is the code snippet: private val images = ArrayList() private val storageRef = Firebase.storage.reference .child("images") fun delete(position: Int): Boolean { val toDelete = images[position].url // And then what? return true } The MyImage object simply contains the bitmap of the image,...

How to calculate the sum of an attribute in a list Jpa? If I wanted to have an attribute of my order table so that it adds up to the total price of the list of products, which I should use since I could not find a solution, please @Entity @Table(name = "ordenes") class Orden( @Id @GeneratedValue(strategy = GenerationType.IDENTITY) val id: Int? = 0, val createdAt: LocalDateTime? = LocalDateTime.now(), val updatedAt: LocalDateTime? = LocalDateTime.now(), val nombre: String? = "", val...

How can I identify nouns in a string in Android Studio? I have an Android application written in Kotlin and I want to identify nouns in a text that the user entered. Basically, I need a POS tagger. What's the best thing I can use for this?

Android UI elements null when returning from intent I have added a button to a fragment that starts a new activity. It works, but when returning from the intent, I have no access to the ui elements any more (from the activity that holds the fragment) - they are null. What is the proper way to handle this setup? I have the following configuration: Activity A indcludes tow fragments (Frament 1 and Fragment 2) Fragment 1 has a button to start a new Activity B. The intent is given activity (Actvity A) as argument. When returning from Activity B,...

Edit variables and use another class (Kotlin) Please help, the program not work. I want to change the variables a and b and put them in the names Thanks.............................................................................................. class Asd(){ lateinit var a: String lateinit var b: String var database = FirebaseDatabase.getInstance().getReference("RedCars") .child("20-8-2020 18:0") .addValueEventListener(object : ValueEventListener { override fun...

Do Kotlin Extension Functions declare member variables implicitly? I have a data class User data class User(name: String?, email: String?) and I created an extension function to get the best identifier (name first, then email) fun User.getBestIdentifier(): String { return when { !this.name.isNullOrBlank() -> this.name !this.email.isNullOrBlank() -> this.email else -> "" } But I noticed that in my IDE if I get rid of all of the this words, it still compiles and runs. Like: fun User.getBestIdentifier(): String { return when {...

Kotlin select from list I have a situation like class Ball {} class WhiteBall : Ball {} class BlackBall : Ball {} val listOfBalls: List = ... How elegantly get first balls from the list/array while, for example, i've taken if (ball is WhiteBall) balls++ return@takeWhile balls

How to change language of DialogFragment I have my DatePickerDialog and CalendarDialog all set up and working fine. Problem is I would like to switch it to another language. Using stackoverflow I have come across following soultion which solved my problem partially, by writing: val locale = Locale("hr_HR") Locale.setDefault(locale) val config = Configuration() config.setLocale(locale) Only 1 small part of calendar is translated then to croatian<a href=""...

LiveData not emiting new values after two searchs So, I have an app that has a searchview, each time I search for a cocktail it refreshs the list with that cocktail, this works with the first and second search, after doing it for the third time the livedata is not emiting again and hence I cant see the loading if the new searched data View private fun setupObservers(){ viewModel.fetchTragosList.observe(viewLifecycleOwner, Observer { result -> when(result){ is Resource.Loading -> {...

Is There A Serverless Key Value Database That Supports Arrays I Can Use That Works With Kotlin (and/or Java)? [closed] The title is self explanatory. I need a database that is serverless, works with Kotlin/Java, which is also a Key Value database, which also supports arrays. I've looked around and I haven't really found much so any help would mean a lot!

How to change a list from one type to another with map function I have a livedata in my viewmodel that returns a Resource which I want it to return a Resource , I want to apply the map function in this method but I did not understand correctly the difference with the switchmap one fun getTragosFavoritos() = liveData(Dispatchers.IO) { emit(Resource.Loading()) try{ emit(repo.getTragosFavoritos()) }catch (e: Exception){ emit(Resource.Failure(e)) } } I want to do the map right here, I have tried fun...

IBM Cloud Natural Language Understanding API android.os.NetworkOnMainThreadException Error I'm using IBM's Natural Language Understanding API to return information about tokens in the input text. This is the code that I have in my onActivityResult to make a syntax feature request: authenticator = IamAuthenticator("my_api_key") naturalLanguageUnderstanding = NaturalLanguageUnderstanding("2020-08-05", authenticator) naturalLanguageUnderstanding.serviceUrl = "my_url" syntax = SyntaxOptions.Builder().sentences(true).build() features = Features.Builder().syntax(syntax).build()...

How to sum the cost of each item in a One To Many relationship JPA? How could I calculate the total of an order in a one to many relationship, when the customer buys a certain number of items in the order attribute, he wants to know, he could start to investigate, to carry out that. I'm really a little confused, I really want to learn @Entity @Table(name = "orders") class Order( @Id @GeneratedValue(strategy = GenerationType.IDENTITY) val id: Int? = 0, val name: String? = "", val address: String? = "", val...

Getter for defaultDisplay: Display!' is deprecated. Deprecated in Java I need the width of the screen. But recently found Android defaultDisplay deprecacted with message: Getter for defaultDisplay: Display!' is deprecated. Deprecated in Java Code: val displayMetrics = DisplayMetrics() windowManager.defaultDisplay.getMetrics(displayMetrics) return displayMetrics.heightPixels Please suggest an alternative.

How to modify the item count of recycleviewer when the end of the last is reached? I am looking to modify the number of items that is displayed in my recyclerviewer on the event that the last item of the current itemcount is viewed.. var mainadapt = MainAdapter() Timeline.adapter = mainadapt fun OnLastItemReached(){ Timeline.adapter.itemCount += 10 } The code above is incorrect since the method ".itemcount" isn't a class variable so it can't just be modified at will. But it is the logic that I am trying to showcase, Basically...

¿How Glide module in CustomInfoWindow? Kotlin I am currently using Glide to upload images to my app. It works fine until I have to load an image into a CustomInfoWindow. I get a warning that has to do with the problem, also I think it has something to do with the available cache. Warning: Logcat: W/Glide: Failed to find GeneratedAppGlideModule. You should include an annotationProcessor compile dependency on com.github.bumptech.glide:compiler in your application and a @GlideModule annotated AppGlideModule implementation or...

Problem using Apache Poi to write excel file(xlsx) in Android Studio. Looking for solution or alternatives to write excel other than apache poi So i'm newbie and working on a project in android studio and i need to write data in excel file in internal storage(.xlsx). I've got the permission and now i'm using apache-poi newest release. i've been countering problems after problems since i'm new with android studio. I've included apache-poi, ooxml, ooxml-schema, xmlbeans. and i've got problem on importing javax.xml.XMLstreamreader, so i tried to include stax-api-1.0-2.jar but now i got this error while running my application :...

removeAt removes elements in passed ArrayList too I've never saw this @RequiresApi(Build.VERSION_CODES.LOLLIPOP) private fun eraseOldLocations() { val a: ArrayList =myUbs val minTime: Long = (now- tenDaysago) val z = misUbs.size for(i in 0 until z){ if( myUbs[i].time

android google map supportmap fragment can't be initialized in fragment I'm trying to create implement a Google-Map in android using fragment : override fun onCreateView( inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle? ): View? { return inflater.inflate(R.layout.fragment_map_test, container, false) } override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) //the line below get's error val mapFragment = view?.findViewById(R.id.sp_map_test) as...

how to pass a context to retrofit object? [duplicate] here is my code, so I have a retrofit service like this object RetrofitService { private val loggingInterceptor = HttpLoggingInterceptor().setLevel(HttpLoggingInterceptor.Level.BODY) private val okHttpClient = OkHttpClient.Builder() .callTimeout(30, TimeUnit.SECONDS) .connectTimeout(30, TimeUnit.SECONDS) .readTimeout(30, TimeUnit.SECONDS) .writeTimeout(30, TimeUnit.SECONDS) .addInterceptor(loggingInterceptor)...

Repeating Alarm gives notification inexact time I set repeating alarm set at 3:55AM. Suppose in the noon, at 1:00PM I on alarm button from app. Instantly i get notification for 3:55AM alarm. but why this? val pendingintent = PendingIntent.getBroadcast( mContext, pos, notificationmassage, PendingIntent.FLAG_UPDATE_CURRENT ) val am = mContext.getSystemService(Context.ALARM_SERVICE) as AlarmManager...

Handle Koin in base fragment (Module already loaded error) I have a base fragment and 2 more fragments eg fragmentOne, fragmentTwo that extend the base fragment. abstract class BaseFragment(): Fragment(){ init{ loadKoinModules(listOf(sampleModules)) } override fun onDestroyView() { super.onDestroyView() unloadKoinModules(listOf(sampleModules)) } } When I landed on fragmentOne, koin modules are loaded and everything is fine. I navigate from fragmentOne to fragmentTwo, loadKoinModules is called again before...

swap elements by scope function in kotlin Hi guys i'm new to kotlin and working on transposing a matrix. I was so impressed by [swap function in kotlin][1]. (Actually this one is why i learn kotlin) var a = 1 var b = 2 a = b.also { b = a } println(a) // print 2 println(b) // print 1 now I'm trying to use it on my transpose function. class Matrix(val matrix : Array){ val rowSize = matrix.size val colSize = matrix[0].size } fun transposeMatrix(matrix: Matrix): Matrix { return Matrix(matrix.matrix.mapIndexed { rowindex,...

How Do I Convert An ArrayList of UUID To A ByteArray (Java or Kotlin Answers Work)? object UUIDConversion { fun UUID.toByteArray() : ByteArray { val byteBuffer = ByteBuffer.wrap(ByteArray(16)) byteBuffer.putLong(this.mostSignificantBits) byteBuffer.putLong(this.leastSignificantBits) return byteBuffer.array() } fun ByteArray.toUUID() : UUID { val byteBuffer = ByteBuffer.wrap(this) val firstLong = byteBuffer.long val secondLong = byteBuffer.long return UUID(firstLong, secondLong) } } I have the...

How do I test a Kotlin suspend call in Android with MockK? everyone. I'm trying my hand at TDD with an Android app. I'm writing it in Kotlin, and because of that I've turned to MockK for testing, but there's one thing (for now) that I haven't been able to find out how to do: test a suspend call. I wrote a test for a LiveData value in a ViewModel, and made it work. However, when I added coroutines to the mix, I started getting the "Method getMainLooper not mocked" message. Here's my code: ToDoListViewModelTest.kt class ToDoListViewModelTest {...

how to call Flutter Function after contact change notification from Native(Swift &amp; Kotlin) So I am trying to update contacts upon change notification. I was unable to find any flutter plugins that did so(If you do know any plugins that does so please let me know!! ). I decided to implement the notifications and send a call to do a functionfrom native to flutter. How do you do that? I am really confused.

Kotlin fragment : activity returns null outside onActivityCreated I'm trying to use startActionMode inside a fragment. startActionMode works fine in the onActivityCreated method. But outside onActivityCreated method, activity returns null and hence activity?.startActionMode(mActionModeCallback) doesn't work. package com.akshat.music import android.app.Activity import android.content.ContentUris import android.content.Context import android.net.Uri import android.os.Bundle import android.provider.MediaStore import android.util.Log import android.view.*...

RecyclerView notifyItemMoved() should only move those items whose positions are not fixed I have requirement of a RecyclerView such that some of its elements(continuous) are fixed at its positions. When I am calling adapter.notifyItemMoved(from, to) , elements should move in such a way that fixed elements doesn't move. Is it possible in RecyclerView? If yes, then how?

Android Two-Way Data Binding with Double (Kotlin) I have a ViewModel class defined as follows: class StockLoadTaskModel : ViewModel() { .... .... var d: Double = 10.0 } That is bound to the following layout: And I have also the following Converter object: object Converter { @JvmStatic @InverseMethod("stringToDouble") fun...

Kotlin Adapter does not load view and Picasso crashes I have this adapter class, where I want to display photos. It seems that the problem is that XML views are not loaded properly in ViewHolder. Where I am making a mistake? class PhotosAdapter(private val photos: ArrayList, private val listener: PhotosListener) : RecyclerView.Adapter() { override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder { val itemView: View = LayoutInflater.from(parent.context).inflate(layout.list_item_photo, parent,...