Kotlin - Type inference failed for findViewById i'm trying to access the setOnClickListener method of the clear button that comes from Google's Place Autocomplete API R.id.place_autocomplete_clear_button. i found an answer here: but i get the error stated in the title placeAutocompleteFragment?.view?.findViewById(R.id.place_autocomplete_clear_button) I know in Kotlin you can apply the: apply plugin: 'kotlin-android-extensions' and then import it in the working class:...

Android Studio ERROR: Failed to resolve Error Please help me `apply plugin: 'com.android.application' apply plugin: 'kotlin-android' apply plugin: 'kotlin-android-extensions' apply plugin: 'kotlin-kapt' static def gitBranch() { def branch = 'GitHub' try { def gitcheck = 'command -v git >/dev/null 2>&1'.execute() gitcheck.waitFor() if (gitcheck.exitValue() == 0) { def proc = 'git rev-parse --abbrev-ref HEAD'.execute() proc.in.eachLine { line -> branch = line } proc.err.eachLine { line...

Passing Captured Image intent to Another Activity using KOTLIN this is my code from my CameraFragment, and i want it to pass/share the image captured to my CrimeListFragment(my other activity).. i don't know how to call it. anyone willing to help ??? private lateinit var imageView: ImageView private lateinit var button: Button private lateinit var next: ImageButton private var photoFile: File? = null private val CAPTURE_IMAGE_REQUEST = 1 private lateinit var mCurrentPhotoPath: String private val IMAGE_DIRECTORY_NAME = "DCIM" override fun...

writing nodejs applications in kotlin with intellij idea ce I am trying to develop a Nodejs application using Kotlin 1.3.11 using the IntelliJ IDEA CE development environment. Unfortunately I haven't made any progress towards a running application. To ensure everything is setup correctly I want to print out a simple "hello world". I searched for articles or tutorials about the topic but I didn't find much about bringing those three together (Kotlin, IntelliJ, Nodejs). The most specific ones which I found are: <a...

getter is deprected after converting code to Kotlin I'm trying to set some values to some dialog properties based on list item position and have just converted some code from Java to Kotlin, but for some reason, all the myList[position] instances within the click listener return this error: 'getter for position: Int' is deprecated. Deprecated in Java. However for `onBiWhat alternative can be used to resolve this error? class MyRVAdapter(private val myList: ArrayList) : RecyclerView.Adapter() { override fun getItemCount(): Int {...

I can not undcerstand the generateSequence function in Kotlin I'm baffled by the generateSequence in Kotlin. I seem to be reading the manual all worng: This is the function signature (for generateSequence with seed): fun generateSequence( seed: T?, nextFunction: (T) -> T? ): Sequence So the Sequence should be of the same type of the seed and so should the next value going to the next iteration generation.... But the example in the man is: fun fibonacci(): Sequence { return generateSequence(Pair(0, 1), { Pair(it.second, it.first +...

Kotlin - Clear Button listener for google's Place Autocomplete API onClick not called I'm trying to create a listener for the clear button that comes from google's Place Autocomplete API. i called my clearButton() method in my fragment's onViewCreated method clearButton() placeAutocompleteFragment?.view?.findViewById(R.id.place_autocomplete_clear_button) ?.setOnClickListener { View.OnClickListener { Log.d(TAG, "Cleared") it?.findViewById(R.id.place_autocomplete_search_input)?.setText("") it?.visibility = View.GONE }...

Android Studio error How fix this error? Please help me protected fun wrapSlidingMusicPanel(@LayoutRes resId: Int): View { @SuppressLint("InflateParams") val slidingMusicPanelLayout = layoutInflater.inflate(R.layout.sliding_music_panel_layout, null) val contentContainer = slidingMusicPanelLayout.findViewById(R.id.mainContentFrame) layoutInflater.inflate(resId, contentContainer) return slidingMusicPanelLayout } fun setAntiDragView(antiDragView: View) { slidingLayout.setAntiDragView(antiDragView); } private fun...

Unresolved reference to KFunctionN I am trying to create function references in Kotlin, my understanding is I should be able to access the generated KFunctionN interfaces at compile time, but I am getting an 'Unresolved reference' compilation error for KFunction1. For example: inline fun passFn(someFn: KFunction1): R { //consume someFn } I have kotlin-reflect on the class path and working fine. Any ideas what I am missing?

Kotlin - Performant and scalable way to get class instance property value by id or by string I would like to make the properties of a class and it's child classes available at runtime for read and write via by integer id or by the name of the property with performance as close to that of a regular compiled read or write as feasible. There may be many instances of the this class and it's child classes (say up to 1 million) and each class may have hundreds of properties, so I want to minimise the memory used by each property in each class instance. The broad solution groups that I see...

sortBy() selector not sorting List I have a sortedBy{} statement which intends to sort a List by the length of the String elements: var animals: List = listOf("tiger", "cat", "dragon", "elephant") fun strLength(it: String) = it.length animals.sortedBy { strLength(it) } animals.forEach {println(it)} However it only prints the initial order. Any idea why?

Request focus for an editText that is in a recyclerView I’ve created a custom view that can be inflated on a fragment which contains a recycled view. The custom view is to handle some form style things for clients, so the recyclerView has at least one row that has and editText. I’ve been trying to requestFocus() on the first rows editText, but I’m have zero luck. I’ve spent hours pouring over similar problems, but I’m yet to find one that works with a custom view. The biggest problem I’m having is that I can’t find somewhere to...

How to properly handle generic types? I am trying to create a custom function that will handles all my API response, but I don't know how to properly handle it. This is my code My Custom callback interface ResponseCallback { fun onSuccess(response: T) fun onError(code: Int, message: String) } This is how I call my request API createRequest(getLogin(id), object : API.ResponseCallback{ override fun onError(code: Int, message: String) { } override fun onSuccess(response: LoginResponse) { } }) and...

Kotlin Koans: Operator overloading I'm completing Kotlin Koans's Comparison exercise and am wondering why compareTo() is the function being overriden but compare() is the function being used. How do the two functions relate here? data class MyDate(val year: Int, val month: Int, val dayOfMonth: Int) : Comparable { override fun compareTo(otherDate: MyDate): Int = when { year != otherDate.year -> year -...

Extension function and tail call optimization (TCO) in Kotlin I have the following function that uses TCO: tailrec fun superDigit(n: String): Int { val sum = n.fold(0) { sum, char -> sum + char.toString().toInt() } return if (sum < 10) sum else superDigit(sum.toString()) } If I implement the same function as an extension function like this: fun String.superDigit(): Int { val sum = fold(0) { sum, char -> sum + char.toString().toInt() } return if (sum < 10) sum else sum.toString().superDigit() } Is the extension function tail call...

Values not received from Coroutine's Channels My code-flow is the following: SqlDelight queries ( 2x ) -> Coroutine Channels ( 2x ) -> Coroutine Channel ( 1x ) I noticed that the Queries' Channels are emitting, but the Presenter never receive the values. Also the for-loops iterating on Channels are never quitted, I think this is good, but I can't figure out why values are never received so :/ ViewModel init { // When ViewModel is instantiated, start observing for UiModels launch( IO ) { startObserving() } } private suspend...

AutoCompleteTextView with search ime options I want to do the searching with autocompletetextview, so I need to add imeOptions to autocompletetextview with "actionSearch" and it would be like this: Then, I set editor listener to the view like simple EditText with actionSearch, so it would be like this: acPetShopSearch.setOnEditorActionListener(object : TextView.OnEditorActionListener { override fun onEditorAction(v: TextView, actionId: Int, event: KeyEvent): Boolean { if (actionId ==...

How to Check Double value is Null or Zero in kotlin How to Check Double value is Null or Zero in kotlin val ratio:Double? = 0.0 val calRatio = if (ratio == null || ratio == 0.0) 0.12 else ratio ratio in null , 0.0 , 0.1 if ratio null or 0.0 then return 0.12 and ratio is 0.2 or more then return same ratio value how to check this algorithm not use if statement

How to disable RECENT button of a mobile programmatically through AccessibilityService in Android I am trying to create an app , In that I want to disable all the buttons. I have managed to disable the Home, Volume and Back buttons but I'm unable to disable the Recent button. I have tried disabling the Recent button using Accessibility but had no luck. Any ideas or help would be appreciated, Thank you I'm new to Stack so guide me if I have done any mistake in asking the question. My Code: (Which isn't working) class MyAccessibilityService : AccessibilityService() { override...

android studio - Unresolved reference R and libraries must be same version specification i'm out of town right now, and so i'm working from my laptop for the first time. I cloned my repo from github, and i was expecting i could run my app smoothly , but i'm getting error "Unresolved reference R" everywhere throughout my code. Also i got this error too in my gradle: I've clean/rebuild project no luck. Everything was running fine from my PC at home.

How can i delete a image from gallery after using Intent ACTION_PICK? I need to delete a image from the gallery after using Intent.ACTION PICK. my code works ok when i dont use google photos to select the picture. i already ask for the permissions in my manifest. This is my fun with the intent: fun selectPhoto(){ if (ContextCompat.checkSelfPermission(this,android.Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED ){ val intentOnResult = Intent(Intent.ACTION_OPEN_DOCUMENT) intentOnResult.type =...

Play different Youtube videos on button press (Android) Suppose I have the following code: val billiejean = "B02LXuKWGTI" val smoothcriminal= "CBrWNbjw3RA" bjbutton.setOnClickListener{ play(billiejean) } smbutton.setOnClickListener{ play(smoothcriminal) } fun play (video:String){ //something } Pressing bjbutton makes the app play Billie Jean. Pressing smbutton makes the app play Smooth Criminal What code should I put in the 'play' function? Help most appreciated.

DialogFragment searching for incorrect component As I try to open a Dialog during app deployment, the Logcat unexpectedly seems to be searching for a component that isn't within a certain layout file, then returns this error: No view found for id 0x7f090100 (id/mViewPager) for fragment TabbedDialogFragment. Why is TabbedDialogFragment searching for a ViewPager rather than a TextView (where the text will go)? TabbedDialogFragment class import android.widget.TextView import android.os.Bundle import android.view.ViewGroup import...

Java private static final field and anonymous inner classes vs. Kotlin const val and object expressions/declarations Let's say I have a Kotlin interface: interface Dog { fun walk() } I want to create an Kotlin object of this class with slight modifications, like so: val poodle : Dog = object : Dog { override fun walk() { ... } } However, I also want to add a what is equivalent to a private static final field in Java to this object, like so (this is a working example in Java):...

Getting first onNext signal from list of Mono Consider there are 3 functions that results in Monos. I am trying to get the first result emitted by any of the Monos. Here's a test to describe what I am looking for: fun main() { StepVerifier .create(firstElement()) .expectSubscription() .expectNext(3) .expectComplete() .verify() Thread.sleep(2000) } fun firstElement(): Mono = Flux.concat(_1(), _2(), _3(), _4()).next() fun _1(): Mono = 1.toMono().delayElement(Duration.ofMillis(1000)) fun _2(): Mono =...

Why does toString on an IntArray adds an address to a list in kotlin? I have just started playing with kotlin and was going through the udacity bootcamp course for kotlin I want to solve below problem statement: Create an integer array of numbers called numbers, from 11 to 15. Create an empty mutable list for Strings. Write a for loop that loops over the array and adds the string representation of each number to the list. Additionally see the nos are added properly (print out the contents of the list) Below is my code for this: var numbers : IntArray =...

How to convert String to Byte Array in iOS module of Kotlin Multiplatform project? This is my first experiment of Kotlin Multiplatform and it seems that I've not got some peaces completly. My backend sends a notification message via socket in UDP Multicast (I probably need to implement this part per platform as I don't think Kotlin does it for me). Then I want to pass this message (which in form of Byte Array) to my common module. This module is responsible to parse the message and return result to platforms. Just to simplify my work, I want each platform to return...

how to set BottomNavigationView items in the center in android (Kotlin) I have 3 items in my BottomNavigationView that I resized every Item with this code : val menuView = bottomNavigation.getChildAt(0) as BottomNavigationMenuView for (i in 0 until menuView.childCount) { val iconView = menuView.getChildAt(i).findViewById(android.support.design.R.id.icon) val layoutParams = iconView.layoutParams val displayMetrics = resources.displayMetrics layoutParams.height =...

Why do suspending functions throw exceptions in finally As the title says, why do suspending functions throw exceptions in finally? With regular functions, the finally block executes all of them

Does swift have standard (scope) functions like in Kotlin? In Kotlin we have a list of standard (scope) functions (e.g. let, apply, run, etc) Example of usage below val str : String? = "123" str?.let{ print(it) } This makes the code looks more succinct without need to have if (str != null) In swift, I code it as below var str: String? = "123" if str != nil { print(str!) } I have to have if str != nil. Is...