Autocomplete or Code Analyzer not working in Android Studio I am currently working on recyclerview adapter. I can not work further because my autocomplete/code analyzer is apparently not working. I need it to generate the implementation of Recyclerview.Adapter automatically. please help me.. I have a hunch that the problem was caused by my gradle configuration. FYI, everything works fine before i resync my gradle (module). here is my current gradle configuration: plugins { id 'com.android.application' id 'kotlin-android' id...

How to build a custom seekbar with scale on Top [![enter image description here][1]][1] how to build this seek bar in android, the scale on top irregular intervals. [1]:

Probem while reading field in document from firestore in kotlin private fun logInRegisteredUser() { if (validateLoginDetails()) { // Show the progress dialog. showProgressDialog(resources.getString(R.string.please_wait)) // Get the text from editText and trim the space val email = et_email.text.toString().trim { it if (document != null) { arrList = document.get("organization") as ArrayList if...

How to set layout params for a dynamic view in Android This type of question has a lot of answers but essentially what I'm looking for is to inflate a view with additional layout params like margin and the container would be the activity_main. Activity class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val root = findViewById(R.id.root) val view = LayoutInflater.from(this)...

Predicate alternative in Kotlin I try to create lambda in Kotlin. I has following Java interface: public interface Specification extends Serializable { @Nullable Predicate toPredicate(Root root, CriteriaQuery query, CriteriaBuilder builder); } And in Java I can return new Specification from method like: private Specification nameLike(String name){ return new Specification() { @Override public Predicate toPredicate(Root root, CriteriaQuery query, CriteriaBuilder criteriaBuilder) {...

Sharing value between two recyclerviews in one activity for Android How to share value between two RecyclerView? That are in one Activity? Below is my code with just one RecyclerView binding. That is OK and I understand how it works. What I want to add another RecyclerView in the same page. Both RecyclerViews are tables. When user clicked on item in first RecyclerView anything changed in second RecyclerView. Repository usually returns List of data from Room database. What I appreciate would be some code example or maybe some tutorial with example. This is...

How to save changed data from ListView items to Database? I have a ListView and each item looks like this. Each item have a Switch and a CheckBox, which have isChecked states i got from Firebase. And here an overall activity layout: At the bottom, there are two buttons. On the left is the "Save" button(id:agree_button) and the right is "Undo All"(id:undo_button). How to...

Navigation Component : How to pass safe args from main fragment to navigation drawer in Main Activity which hosts the main fragment? I want to get safe args from the main fragment in the main activity, to provide them to the navigation drawer. How can I get arguments in NavController.OnDestinationChangedListener, from an API called in the main fragment or any other fragment.

Create Unit test that includes Databinding Mockito? Currently, I am looking for an example which will be able to run my tests. I have an activity that hosts a fragment, and my tests throw the Null Pointer exception at the binding.elementName = value. @Test fun testingSignUpValid() { val signUpFragment = spy(SignUpFragment::class.java) val email = "String" val password = "String" val fullName = "String" val isValid = signUpFragment.validateForm(null, password, fullName) } binding.editTextEmailAddress.error = "Not a valid...

Convert list of object into another object using map operator kotlin? I have the following JSON data [ { "type": "carousal", "items": [ { "type": "story", "data": { "display_name": "grinning 1" } }, { "type": "story", "data": { "display_name": "grinning 2" } } ] }, { "type": "carousal", "items": [ { "type": "story", "data": { "display_name": "grinning 3" } }, { "type": "story", "data": { "display_name": "grinning 4" } } ] } ] Corresponding data classes are data class...

Why is Looper.getMainLooper() null on unit test I'm trying to make unit test for a class that extends from a view and I'm getting a null pointer exception due to at some point in the parent class, it's trying to use Looper.getMainLooper().thread which actually is null. After trying to understand why the view initialisation was failing, throwing a NPE, I noticed that it seemed to be because Looper.getMainLooper(). How should I write unit test for a view that checks for main looper and where do tests executed on MockitoJUnitRunner are...

How to pass different value when switchMap is not executed? Android + Kotlin I have a huge understanding problem here, I have a ecommerce app and I cannot properly calculate value of users cart. The problem is, my solution works well to the point but I have an issue when there are no products in the cart. Obviously LiveData observer or switchMap will not get executed when it's value is empty. It seems like something trivial, only thing I want to do here is handle the situation when user have no products in the cart. Is the livedata and switchMap a wrong approach...

View objects are not showing in code. I'm making a Custom Dialog open class BaseActivity : AppCompatActivity() { private var doubleBackToExitPressedOnce = false private lateinit var mProgressDialog: Dialog override fun onCreate(savedInstanceState: Bundle?) { val binding = ActivityBaseBinding.inflate(layoutInflater) super.onCreate(savedInstanceState) } fun showProgressDialog(text: String) { mProgressDialog = Dialog(this) mProgressDialog.setContentView(R.layout.dialog_progress) mProgressDialog.tv_progress_text.text = text...

Convert given string to list of integers in Kotlin? I want to convert a user given string to list of integers. If i write 12345 i want [1,2,3,4,5] I am trying this code to achieve it but gives an exception. fun main() { println("Enter Number") var numberList = readLine().toString().split("").map { it.toInt() } println(number) } This gives a NumberFormatException: For input string: "" If i remove .map from it and enter 12345 numberList becomes [, 1, 2, 3, 4, 5, ] But if i change delimiter to " " -with SPACE- and enter two numbers...

Save MediaPlayer State I'm currently working on an Music Player and now I want to save on which song and position the mediaplayer stopped. The songs are stored in my assets folder and i read them into a list. I came up with the idea to write the index of the song and the position into an .xml or an .json, but I wanted to know if there's a better way to save the data?

How to intercept o.s.ws.client.MessageTracing.sent and o.s.ws.client.MessageTracing.received in kotlin How to intercept o.s.ws.client.MessageTracing.sent and o.s.ws.client.MessageTracing.recived in kotlin, to perform some masking on the request and response of soap envelop before the logging process performed I've tried the below but the msgs didn't printed @Configuration class MaskingInterceptor { @Bean fun applyMasking(): ClientInterceptorAdapter { return object : ClientInterceptorAdapter() { override fun handleRequest(messageContext: MessageContext): Boolean...

How do you test a case of Layout Binding in Mockito or any Unit Test (for coverage)? I am currently looking for a way to test a couple of methods, and I am using Layout Bindings. buildFeatures { viewBinding true } After most login, at some point, the code interacts with the binding and it throws a Null Pointer, I debugged a bit and noticed that the spy(k) Fragment's Binding is null, and even if I were to do the same logic inside the activity its binding is null as well. Any ideas/ advice can provide more source code if necessary.

What is the difference in my code as compared to the code I found on Google to check if my code is right? in short, the question is, I want to delete the last element of the DOUBLY LINKED LIST and I wrote this function... fun deleteLast(){ if(isEmpty()){println("list is empty")} if (head!=null && head?.nextNode == null){ head = null }else { tail = tail?.previousNode tail?.nextNode = null } } I went to the tail without traversing it and made its previous as new tail and new tail next(old tail) as null. And my result is desirable. after writing this I pinged...

Finding button by id and change itself width I need to correct button's width automaticly, but for it, I think, I need to use code like below class MainActivity : AppCompatActivity() { val displayMetrics = DisplayMetrics() val width = displayMetrics.widthPixels val button_main=findViewById(R.id.button_main) override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) button_main.setWidth = width / 3 } } Unfortunately , if I use...

Code conversion issue from JAVA to Kotlin I am trying to integrated this awesome Calender event library in my Kotlin project https://github.com/alamkanak/Android-Week-View I have created a Kotlin project. I am unable to convert the MonthChangeListener in kotlin MonthLoader.MonthChangeListener mMonthChangeListener = new MonthLoader.MonthChangeListener() { @Override public List onMonthChange(int newYear, int newMonth) { // Populate...

Kotlin for Android, Beginner developer: how to best store and organize informational data in mobile app? I just started learning Android app development recently. I would really appreciate the help. I have pretty much learnt the basics and made some very simple apps (Google Kotlin Course). Main question: If you have an app that shows a bunch of informational data, where should you store it? And how would you organize the data? Background: I am trying to make my own app, and decided to start by making a small part of the app. The app works sort of like an encyclopedia for ingredients used in...

Change language of context menus How to change the language of the context menus(cut/copy/paste) that appear on long pressing in form fields or text fields in an Android App. Currently, the options appear in the app's set language and I want it to show in the system's language.

Actual/expect funs in shared throw NoSuchMethodError in Kotlin Multiplatform I am developing a dummy weather app with the help of Kotlin Multiplatform. I am using Decompose and MVIKotlin to try and share all the business logic except the native uis, SwiftUI for IOS and Compose for Desktop and Android. I am trying to have a expect composable (for dark theme and for loading of images) // In common main @Composable expect fun isDarkMode() : Boolean @Composable expect fun loadWeatherIcon(id : Int) : Painter // In android main @Composable actual fun isDarkMode() :...

How to use signature pad library with jetpack compose using Android and Kotlin? I was using this library to get signature https://github.com/gcacace/android-signaturepad with Android app written in Kotlin, now I moved to jetpack compose and I want to use it with the new UI library my old code was: XML Fragment class SignatureFragment : Fragment() { private lateinit var signatureBinding: FragmentSignatureBinding override fun onCreateView( inflater:...

How to use generics for ViewModel in Kotlin? I want to create a MainFragment for my existing fragments and create a ViewModel object for each fragment that is provided by viewModels() like this: class MainFragment: Fragment() { private val viewModel by viewModels() } But I get this error: Cannot use 'VM' as reified type parameter. Use a class instead. This is what I want to have: class ProfileFragment: MainFragment() {} And simply use viewModel object from the parent class. How to solve this?

How to fix this error ? Attempt to invoke virtual method 'void android.widget.ImageView.setImageDrawable(android.graphics.drawable.Drawable)' I have 3 XML layouts united with 1 activity with ViewPager and that contain gif assets that I retrieve from firebase storage. When trying to retrieve 2 image assets this code works. But when I retrieve another 1 image asset, this code has an error, and the application force closes. I can make sure that there is nothing wrong with my 3rd XML layouts. See my onCreate function below : override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState)...

Ad failed to load : 0 WHEN USING TEST AD I'm struggling to implement adMob in my app i'm using test ad native id in order to even see things work I keep having this error : Ad failed to load : 0 . I have seen some posts in here that it might be because account is not yet accepted on GoogleAdMob, but I'm using TEST ID, plus i made that account over 12 hours ago, I don't get it. inner class AdItemViewHolder(val view: View) : RecyclerView.ViewHolder(view) { fun bind() { val adLoader:AdLoader = AdLoader.Builder(context,...

Kotlin/Native compilation fails on windows with Java ZipException I've created a new Kotlin/Native application using IntelliJ Idea and it fails to compile. I hadn't change anything. Does it even work on Windows?

Is constructor a function in Kotlin? I just came across a data class as follows. class A{ } sealed class B data class C(val isNext: Boolean = false, val builder: () -> A): A class D: A{ } To create an instance of the class, the developer used the following declaration. C{D()} My understanding of lambda, () -> A is that its a function without name that takes no arguments and creates an instance of A, however given that A's constructor is called, can I presume that its a function?

How to create a viewmodel without using kotlin ktx? I found kotlin extension (ktx) today and tried to use it. Using this, I tried to create a view model using by viewmodels(). But I heard that KTX is going to be deprecated soon, is that correct? Better not to use it? So, how do i create a view model in the future? constructor? Or ViewModelProvider.get(this)?