Data is not transferred from activity to fragment I'm trying to write a data transfer from an activity to a fragment, but I'm catching "NullPointerException" Code MainActivity: val btn1 = findViewById(R.id.button) btn1.setOnClickListener { BlankFragment2.getNewInstance(321) val fm = supportFragmentManager val ft = fm.beginTransaction() ft.replace(R.id.fragment, BlankFragment2()) ft.commit() } Code Fragment: class BlankFragment2 : Fragment() { var str: Int = 0...

How to navigate between Fragment through dynamically created Button? I'm sorry for my bad English. Hello, I'm creating an app that when you click a Button it will create a Button and when clicked, it will navigate to another Fragment. I've already tried making it but for some reason when I click the dynamically created Button, I was sent to the home screen. Here's my code: FirstFragment.kt: class FirstFragment : Fragment() { private lateinit var binding : FragmentFirstBinding override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,...

What are the in and out positions in Kotlin Generics? I want to start with what I know, or at least I think I know, so what I'm asking would be more clear. First of all, I know that you can declare a variable of a supertype and assign an object of a subtype to take advantage of polymorphism with Inheritence and Interfaces. I know that generics provide type safety because the type parameters are invariant by definition, so where A is a subtype of B, Foo<A> is not necessarily a subtype of Foo, and may not be used in place depending on mutability...

Android Google OAuth issue - kotlin I am trying to implement Google login using Google OAuth. Our method uses OAuth to receive a token and send it to the server, and the server sends the token back. So I wrote the following code. However, in the handleSignInResult method, the catch statement is thrown and error code 8 is displayed. Below is the code written by referring to the official document. override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) binding =...

Trying to build a program that enables users to select image from gallery but when I run and choose the image the image doesn't appear in the app Trying to build a program that enables users to select image from gallery but when I run and choose the image the image doesn't appear in the app I have been trying to fix this for the last two hours and can not locate the problem exactly. I don't know if the problem is related to permissions on the part of the application or the problem is from my code. Please help CODES xml kotlin package com.example.projectc import android.app.Activity import...

What does NULL&lt;NULL&gt; or null&lt;null&gt; means? [closed] What is NULL or null ? I tried to Google it but could not find any useful content.

Android ProgressBar does not work unless the progress value and max value are the same The xml code: I set android:max="3660" because that's the maximum value the progressbar will ever have. Kotlin Code: override fun onTick(millisUntilFinished: Long) { meditationProgress++ meditationProgressBar.progress=meditationTimeInSeconds-meditationProgress } Variables: private var meditationProgress = 0 private var meditationTimeInSeconds:Int = meditationTime*60 I actually tried replacing "meditationTimeInSeconds" by "30" in the onTick...

Is there a way to access the Cosmos DB Gremlin API from Java / Kotlin similar to Spring Data? We want to use Cosmos DB Gremlin api from Java, respectively Kotlin and wonder which is the best way to do so. We know the Tinkerpop gremlin-driver works. But is there a way that supports typed mapping in the way Spring Data does? An first attempt would be https://github.com/microsoft/spring-data-gremlin , but that's deprecated now. They recommend looking at generic spring data approaches...

Kotlin upload images and description to Firebase I am trying to upload images from the phone gallery and a short description of the image to firebase. When I click on the "add post" button it should send me to the gallery where I select an image and after that, it requires a description and it can be posted. The problem is, when I click the "add post" button it doesn't open the galley but it says "No apps can perform this action" Blockquote package...

Make retrofit fetch new data from server only if localy cached data is older than 5 minutes I have to make my retrofit client fetch new data from the server only if the locally cached data is older than 5 minutes or if it doesn't exist private fun initRetrofit(){ val retrofit = Retrofit.Builder() .baseUrl("https://newsapi.org/") .addConverterFactory(GsonConverterFactory.create()) .build() val service = retrofit.create(NewsService::class.java) val call = service.getCurrentNews( "bbc-news",...

Kotlin Modifier for Continuous Coordinate Inputs - Jetpack Compose? I'm trying to have a box or image object be able to translate around the screen using X and Y coordinates received from the console/commandline or external app. Is there a way to tweak the Kotlin Modifier PointerInput() to accept continuous X and Y inputs instead of detecting drag gestures? I am using Jetpack Compose API. Box() { var offsetX by remember { mutableStateOf(0f) } var offsetY by remember { mutableStateOf(0f) } Box(...

how to fake Result.toMappedResponse? Trying to make fake class for testing do not know how make it return the needed list with MyData objects. val result = Result.toMappedResponse( //Put something here to make it return List of MyData ) override suspend fun getMyData( ex: String, us: String ): Result { return result } And this is not a fake original function override suspend fun getDepartmentExtensions( ex: String, us: String ): Result { return Result.toMappedResponse( {...

What is wrong with my sharedPreference I setup to save user inputted data? The code below relates to my DatePicker method that you can choose a date and the TextView displays the date chosen as shown I have a saveData() and loadData() function and when I go to save the data from my DatePicker, it doesn't display the date chosen by the user after I go back into my Letter created. I currently have a setOnClickListener within my ActivityMain that doesn't seem...

How understand, what link from web view is YouTube link, to open it in YouTube app? I want, when user click on web view link,it's open YouTube app. How i can parse this link,i.e what algorithm should i use,to know,whether it link on youtube video (exact video, not channel or simple YouTube site). Because you can have,for example youtube.com,or youtu.be,so it not so obvious solution of this problem. Probably i should use regex,but i am not sure, what it right way. May be somebody decompile youtube app and asee sources of this app to know,how it understand,what it correct...

Jetpack Compose State List Drawable Equivalent What is the best way to get functionality of a StateListDrawable in Jetpack Compose?

Passing Database into Repository to Get the Right MongoDB Collection The way I want to layout my data in Mongo is: account - sites - orders - etc where account will be a UUID. So it might end up looking like... a131258b-0ae1-442a-ba57-37d1ed4cd784 - sites - orders - etc 71af278b-0cb6-44f0-9f75-4c3f3bb262a7 - sites - orders - etc The account will be part of the auth token, so my current plan is to just pass that account UUID into all the repository methods and subsequently, into the getCollection method. fun findAll(accountId: String):...

Upload image and description on Firebase using Kotlin At the moment, my application uploads images on firebase, but I want to add a description of that image too. After that, I need to retrieve both image and description on Home Page. But I am stuck at the part where I also add upload the description of the image.. package com.giveandshareauth import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.app.Activity import android.app.ProgressDialog import android.content.Intent import android.net.Uri import...

Android Editable on TextWatcher not appending correctly I´m adding a Thousands separator on my TextWatcher Code: override fun afterTextChanged(s: Editable) { var initial = s.toString() if (!TextUtils.isEmpty(initial)) { initial = initial.replace(".", "") val formatSymbols = DecimalFormatSymbols() formatSymbols.groupingSeparator = '.' val formatter: NumberFormat = DecimalFormat("###,###,###", formatSymbols) editText.removeTextChangedListener(this) val myNumber = initial.toDouble() val...

How to sort by the first letter of a word in Livedata Recyclerview? I have dataclass retrofit from json and a LiveData.I'm sending the adapter list with observe.How to sort by the first letter of a word in observe? private fun getAllTeams(){ viewModel.getMyGroupMembers().observe(viewLifecycleOwner, Observer { it.sortedBy { it.name } it.forEach { it.name.toCharArray().sorted().joinToString("") } Log.d("sort",it.toString()) scoreAdapter.submitList(it)...

Intellij-idea Debugger - Coroutine tab : "An error occurred on fetching information" I'm trying to do some coroutine example represented on : https://github.com/Kotlin/kotlinx.coroutines/blob/master/kotlinx-coroutines-core/jvm/test/guide/example-basic-02.kt and It's debugger not working properly. As you see, even code about coroutine like...

Scheduling another worker from another worker I have read the following post on WorkManager about scheduling worker from another worker. I am attempting to convert our job services, which are written in Java, to WorkManager in Kotlin. In our current code base, when a job service is invoked, it can conditionally invoke another job service. I have a custom job service which fetches Firebase token in the background as follows: public...

How can I get the name of the function within which something is being called in an Android lint check? I'm writing a lint check to flag code that is calling a specific function from within a click listener on an Android view. For example: // case 1 button.setOnClickListener(object: View.OnClickListener { override fun onClick(v: View?) { myTestFunction() } }) // case 2 button.setOnClickListener { myTestFunction() } // case 3 fun someOtherFunction() { myTestFunction() } I would like to flag the use of myTestFunction in both cases 1 and 2 above, but not case 3. It's easy enough to...

Cannot find a Toast message in Android Studio Good morning all ! I am making an android application which contains activity when starting which makes animations but the application just displays a Toast message like "Off bar" continuously even when I close the application I could not detect where I display the Toast after several code reviews the question I want to ask is can I trace the Toast to find the place I display it using the Context because I am doing a function which displays all my Toast with this function takes two arguments...

Why Compiler is not giving warning or showing error for (Any class) methods in kotlin First of all I would like to tell you that I know these methods have internal implementation. My point is its a very confusing behavior. If you are teaching someone that we must need to provide a method body if the method is not declared as abstract in kotlin. So next day your student would come with the picture of Any class and he would ask Sir how this class is working. They don't declared their methods leading with abstract keyword and they don't even have a body. Is their any personal...

How can I create a function that I can access from both a ViewModel and Activity? I am building an android app that has a MainActivity and several fragments. I am using a ViewModel and ViewModelFactory for each of the fragments. I need to create a function that will perform network requests and would like to have it available in one of the fragments so I can display a progress bar to the user. I would also like to access this function from MainActivity in the override function onOptionsItemSelected when a user clicks on the button in the menu in the top right. When called...

Intellij's Kotlin Compiler "Target VM version" options are confusing In the IntelliJ IDEA (Community 2021.1) Settings for the Kotlin Compiler, there's a "Target JVM version" menu with the following confusing options: 1.6, 1.8, 9, 10, 11, 12, 13, 14, 15, 1.6. Are these in chronological order? Why are there two 1.6's? Which one is the latest? Why don't these match the JVM versions here? <a...

How to Sort Descending a Salary in Live Data Recycleriview? Iam using observe for recyclerview Aadapter.There is Default name Sort Ascending:If i write descending method in adapter it will be a Sort Descending but i need the use navigation item (onOptionsItemSelected) private fun getAllTeams(){ viewModel.getMyGroupMembers().observe(viewLifecycleOwner, Observer { val sortedDescending = descending(it) val sortedList = it.sortedBy { it.name } Log.d("sorted",sortedList.toString())...

FlatMapElement Kotlin Beam non Serializable lambda I have an existing Apache Beam project with Java 8, Apache Beam 2.27.0, Maven and Dagger 2. I migrated this project in Kotlin : Kotlin JDK 8 with version 1.5.0 Everything seems to be good except the use of native MapElement or FlatMapElement with Typedescriptor and lambda expression. A part of my pom.xml file 2.27.0 UTF-8 official 1.8 true 1.5.0 1.2.0 1.8 2.35.1 3.7.0 1.6.0 3.0.0-M5...

How do I disable Wildcard imports for all Kotlin files in Android Studio? The Android Kotlin Style Guide says: Wildcard imports (of any type) are not allowed. How do I configure Android Studio to do this automatically?

Can/should I back a parameterized class with a parameterized collection? I am trying to implement a parameterized Queue backed by an Array. Just a simple exercise to get more fluent with generics in Kotlin: class Queue(val size: Int = 1000) { private var count = 0 private var front = 0 private var back = 0 private val queue = Array(size) { null } // Here's what's bugging me fun enqueue(new: T) { if (count >= size) throw Exception("Queue is full") queue[back] = new back = if(back == size-1) 0 else back+1 count++...