Floating action button in Constraint Layout I have got three Constraint Layout inside a Master Constraint Layout which is inside a Scroll View. So basically the structure is like: This is just to give an idea of the structure. I need a floating action button to be visible at the bottom of the screen through out the scroll view. Just like in the image below. How do i achieve it?

kotlin writting nfc tag failing to write more then 4 pages or any numbers I have the following problem in my code I can not write more than 4 pages on my nfc tag also the only data that can be written are strings that are only letters and not exceed the length of 4. The tag has a writable size of 888 bytes. class HomeActivity : AppCompatActivity() { lateinit var adapter: NfcAdapter lateinit var mifareTester: MyMifareUltralightTagTester lateinit var myTag: Tag lateinit var intentFiltersArray: Array lateinit var pendingIntent: PendingIntent val techListsArray =...

Use enum names without prefix in Kotlin? Is it possible to use enum name without its prefix? enum class Color { red, blue, green } data class Shape(val color: Color) fun main() { println(Shape(color = red)) } P.S. Or maybe it has something like literal types in TypeScript? I don't actually need Enum, the string value would be fine as soon as the Compiler would be able to check the values at compile time, like in TypeScript. type Color = 'red' | 'blue' | 'green' class Shape { constructor(public color: Color) {} }...

How can I read Uri , double values from json file in kotlin? I have a Car class and it has brand name , price and uri for image. I have a recyler view in my main activity. I can store my brand name and my other strings in json file and show all strings in recyler view but how can I store and read uri and double in json file? NewCar var newCar = Car() newCar.brandName = brandName.text.toString() newCar.modelName = modelName.text.toString() newCar.price = price.text.toString().toDouble() newCar.fuelType =...

BotNavigation Error after using this piece of code package com.example.meals2 import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import androidx.navigation.findNavController import androidx.navigation.ui.AppBarConfiguration import androidx.navigation.ui.setupActionBarWithNavController import androidx.navigation.ui.setupWithNavController import com.google.android.material.bottomnavigation.BottomNavigationView class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) {...

Flash Player in an android webview I am looking for a way that when creating a webview flash player can run ... CLARIFY: I need to do it because a client asked me, it is impossible to replace the flash with something else :) i was seeing solutions and they were with hardware acceleration but I feel that it is already deprecated. I am looking for a solution no matter if it is in kotlin or in java, since I only require it to work for android device the solutions as I looked for this, they are TOO OLD things and they do not...

Kotlin Activity cannot be null with Websocket When a websocket connection is made I want to show an alert message with Alerter(UI) library that connection is made succesfull. But it crashes every time when I want to show the message. It gives me the error: "Activity cannot be null" Probably because I call the function from another Class. This is the code. class MainInstall : Fragment() { ... override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState)...

Kotlin Error at runtime - Unresolved reference Object ID I am starting to learn android development using Kotlin. I am trying to call object ID in my MainActivity.kt but I am getting an error Unresolved reference : btnDatePicker Given below is the code Given below is the code in MainActivity.kt class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) btnDatePicker.setOnClickListener { Toast.makeText(this, "works",...

Can I put arguments in my Fragments constructor So I have a fragment like this: class MyFragment(val thing: SomeDataObject) : Fragment { override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) // do stuff using

thing

} } And I create and attach it like this: val myFragment = MyFragment(SomeDataObject()) supportFragmentManager.beginTransaction() .replace(R.id.contentFrame, myFragment) .commit() Where I take a variable thing as a parameter -...

How to add protobuf into flutter/kotlin android project I'm trying to add protobuf to my flutter project. Here's the tree ls flutter_project: android docker ios protobuf Readme.md test assets docs lib pubspec.lock build gen oboe pubspec.yaml .proto files are in the protobuf folder I followed the instructions on https://github.com/google/protobuf-gradle-plugin. Here are my build.gradle files:...

Sort list of custom objects based on comparison to string I'm looking to sort a list based on most closely matching to a query. So for my case, I have a custom object called movie, which has several fields, the one I'm concerned with is title. When I do the search, the OMDb API returns some results but unfortunately, the API's results are a little wonky sometimes in the way they're sorted. For instance, searching "Guard" returns "The Old Guard" first, even before movies titled "Guard" and "The Guard". So what I'm looking to do is take the query...

Translate mongodb aggregate query into Java/Kotlin Spring Data So I came up with a query that I'm not really sure how to translate into Spring Data. This is the query: db.collection.aggregate([{ { $group: { _id: "$field", count: { $sum: "$count" }, data: { "$addToSet": "$$ROOT" } } }, { $sort: { count: -1 } }, { $limit: 10 }, { $unwind: "$data" } ]) The problematic part is...

How to display total checkbox checked in a recyclerview I am trying to create a simple pokedex where you can keep track of how many pokemons you have collected. The trouble I am having is the checkbox in a recyclerview. I want to have the total which is currently at zero, go up for each checkbox checked. If unchecked the number will go down. The total number is simply just shown in a text view. Below is an image showing what I am trying to explain, in case I am not explaining it as clearly. <a href=""...

I keep getting "modifier override is not applicable to local function' when trying to use onclicklistener I'm trying to write a code for a small quiz app. When you click the plus button it takes you to a separate page where you input the question and answer. When you click the check button it takes you back to the previous page and a new button with the text set as the question is created. I'm running across an error when I try to put override under my buttonclick event. Is there anyway I can get around this? Newbtn page: package com.example.test import android.app.Activity import...

what are advantages of using livedata over flow ? (observe / collect) I have a question about Kotlin Flow. if we ignore the lifecycle awareness of livedata, why do some guys still prefer to convert flow to livedata (.asLiveData()) and observe it? i want to know if livedata has the upperhand in observing the data over collect in fragments? thanks for your time.

Calling one suspend function asynchronously from multiple places I have a 3 question about android coroutine When calling a function of a singleton class asynchronously from multiple places, I am curious about how to control coroutines. class MainViewModel @ViewModelInject constructor( private val mainUseCase: MainUseCase ) : ViewModel() { fun addAsyncValue() { viewModelScope.launch { mainUseCase.asyncValue() } } } class MainViewModel2 @ViewModelInject constructor( private val mainUseCase: MainUseCase ) :...

How can i user hilt Inject RepositoryManager for ViewModel(viewmodel creat by invoke)? this is my RepositoryManager @Singleton class RepositoryManager @Inject constructor(private val retrofit: Retrofit) { fun obtainRetrofitService(serviceClass: Class): T { return retrofit.create(serviceClass) } } ViewModel： class GankViewModel @ViewModelInject constructor() : BaseViewModel() { @Inject lateinit var repositoryManager: RepositoryManager fun getGankGirl() { repositoryManager.obtainRetrofitService(GankApi::class.java)...

Database repository comparison and/or update in Android Kotlin? I'm new to android programming and want to try to learn best practices. My first app I'm building is a podcast app to display podcasts from an rss feed and play them. What I have so far is working, but I know I can make it work better. I'm using a Room Database with a Repository pattern, which might be overkill because I probably don't need to persist the podcast list across app death if I'm just going to re-parse the feed on startup. In my repository class I'm calling my FetchRSS class to...

error: Ambiguous getter for Field You can @Ignore the ones that you don't want to match I have the following code structure: interface Watchable { fun show: Show } @Entity @Parcelize data class TopRatedShow( @Embedded val show: Show, @PrimaryKey(autoGenerate = true) @ColumnInfo(name = "topRatedShowId") val id: Int = show.id ) : Parcelable, Watchable { override fun show(): Show { return show } } But my code wont compile and throw: error: Ambiguous getter for Field(element=show, name=show, type=com.zk.*.Show, affinity=null, collate=null,...

Can we download multiple files in a Single Coroutine in Android Kotlin Hi all Developers pls sort out my query as much as possible. I'm working on Image Album application. Here while user click on particular album we should download all related images to that particular album. For example album name is Tree so that album have multiple image url's array. So i should download all images from that album by array of url's Ex : imageArray = arrayOf("url1","url2","url3","url4",....etc url(n)) i should put them in for loop or else recursion then i should download...

Espresso IdlingResource example in kotlin and coroutine doesn't work Basically I wanna create an example which is the same to android/testing-samples, except using kotlin and coroutine. The SimpleIdlingResource.kt would look like class SimpleIdlingResource : IdlingResource { @Nullable @Volatile private var mCallback:...

How to get out of this token authenticator Hilt dependency cycle? I have a function that returns an api, which needs an OkHttpClient instance @Module @InstallIn(ApplicationComponent::class) object AuthNetworkModule { @Provides fun provideAuthRetrofitService (@AuthQualifier okHttpClient: OkHttpClient): IQuipsAuth{ return Retrofit.Builder() .baseUrl("${Config.BASE_URL}/") .client(okHttpClient) .addConverterFactory(GsonConverterFactory.create(GsonBuilder().setLenient().create()))...

Getting FirestoreList but can' t add to other MutableList I made 10 different arrays in Firestore. private var list:MutableList?=null private var images:MutableList?=null private var imagesList:MutableList?=null private val db = Firebase.firestore private val groupOne =db.document("animal_voices/level_one").get() private val groupTwo =db.document("animal_voices/level_two").get() private val groupThree =db.document("animal_voices/level_three").get() private val groupFour =db.document("animal_voices/level_four").get() private val groupFive...

How to call function after updating data in room persistence library this is my function inside viewModel class : fun updateMenu(menu: Menu) = viewModelScope.launch { menuDao.update(menu) // updating menu to database total = hitungTotal() // calculate all subtotal to total } private fun hitungTotal(): Int { var sum = 0 menuList.value?.apply { for (i in this.indices) sum += this.get(i).subTotal } return sum } my question is, i want hitungTotal() function is executed after the database is updated

Suspend function reference as parameter of let gets error Why Kotlin can't reference to suspend function as the parameter of let/also and other functions? class X fun a(x: X) {} suspend fun b(x: X) {} X().let(::a) X().let(::b) // Error: Type mismatch

Corda - Register and Listen to Handler/Responder Flows Consider the following Corda flow pair: Sender Flow class SendFlow(val message: String, val session: FlowSession) : FlowLogic() { @Suspendable override fun call(): Boolean { return session.sendAndReceive(message) } @StartableByRPC @StartableByService @InitiatingFlow(version = 1) class Initiator(val message: String, val recipient: Party) : FlowLogic() { @Suspendable override fun call(): Boolean { return...

Unable to use String.contains() in Kotlin 'if' expression Koltin I have created a 'list' of things and want to skip those things which do not contain the character 'o' in them. For which I am using the str.contains() function, but this is throwing error for me. fun main(args: Array) { val list = listOf("book", "table", "laptop", "pen") for (str in list) { if (!str.contains('o')) { continue } println(list) } }

unresolved reference: android build failed with kotlin dsl (reproducible in an empty project) My build.gradle.kts(:app): plugins { id("com.android.application") kotlin("plugin.serialization") version "1.4.21-release-Studio4.2-1" kotlin("android") kotlin("android.extensions") kotlin("kapt") } android { compileSdkVersion (30) buildToolsVersion ("30.0.2") defaultConfig { applicationId ="learnprogramming.academy.relaf" minSdkVersion(24) targetSdkVersion(30) versionCode =1 versionName ="1.0"...

Cannot add Google's "NearbyMessages" Cocoapod to Kotlin/Native project I wonder if anyone can help me to add a cocoapod to a kotlin native module, not having much luck so far! The library is Google's NearbyMessages API. https://developers.google.com/nearby/messages/ios/get-started So far I have: Cloned the KMM with cocoapods sample app. <a href="https://github.com/Kotlin/kotlin-with-cocoapods-sample" rel="nofollow...

Firebase OTP verification onVerificationCompleted not called I'm trying to set up OTP verification so when the user enters their phone number, I send them a pin code, the onCodeSent() is called and I receive the code pin, but the problem is when onVerificationCompleted() is called, I would like to move to another activity where the user can enter the code pin to verify but it is not called at all and I don't understand why. Any help would be appreciated guys, thank you. val auth = PhoneAuthOptions .newBuilder(FirebaseAuth.getInstance())...