Kotlin user input and function May some of you will find time to help me and answer a few questions. I'm implementing an app that will ask user questions, then takes answers, puts them into the 'if' condition, and in case the condition is met (or not) it will switch the fragment. Using android studio it seems that the User interface looks fine now. Next, I have to add a function, which variables need to be taken strings from user input. And when the function runs, it switches fragments. Please take a look of what I've...

Spring injects a bean other than what is specified in @Configuration Recently I've made an error while wiring beans in Spring that caused a behaviour that I'm unable to replicate. Instead of a property sourced with @Value getting injected into Stuff (see the complete demo code below) a value of another bean of type String defined in @Configuration was used when the application was deployed. What I find puzzling is that everything works as expected when running locally (including the unit test), the output is foo not kaboom, and that this 'bean swap' happened...

How can I know Firebase Uri extension After I uploaded file to firebase storage I uploaded firebaseFirestore And I get from firebasefirestore. I want to know firebase uri extension. Image, mp4, docx,pdf I am using kotlin How can I know uri extension ? help please

I gave all the internet permissions but i cant connect with the server in postgres So i am programming an app for a school project and i need it to connect to my remote database (i have it in postgres and its being hosted by heroku) i searched all over the internet, i gave the permissions, and it doesnt work... Im running the app on my physical cellphone (I have deleted a few letters in url so i dont lost control over the server) import java.sql.Connection import java.sql.DriverManager class Database { private var connection: Connection? =...

How to test function that observe live data Trying to write unit test on a function that observe livedata from the another class Could someone help me with it please. The class I'm trying to test: override fun observe(activity: AppCompatActivity) { appCoordinatorManager.getState().observe(activity) { when(it) { is AppCoordinatorManager.State.AssociateWithReferralProgramSuccess -> { navigator.navigateToDashboard(null) } } AppCoordinatorManager.getState() private val state =...

LiveData observes twice instead of only one I'm using MVVM as architecture on my app, but I watch an unexpected escenario in the observer code: myViewModel.getUserInfo().observe(this, androidx.lifecycle.Observer { user -> if (user!= null) { } else { //THE FIRST TIME THROW HERE } In my viewModel I have this: class MyViewModel : ViewModel() { fun getUserInfo(): MutableLiveData { val liveData: MutableLiveData = MutableLiveData() liveData.postValue(UserInfoResponse("user"))...

A grey display overlapping android navigation button below when using BottomSheetFragment? A grey banner is being shown att bottom when the bottom sheet fragment pops up and covers the whole android navigation buttons.

Dagger/MissingBinding but module exists I'm trying to put dagger into my project and I'm facing a compilation issue I don't get since I've done everything like the android developer tutorial. I get: error: [Dagger/MissingBinding] INotificationService cannot be provided without an @Provides-annotated method Here is my app annotation: @HiltAndroidApp class App : MultiDexApplication() { Activity annotation: @AndroidEntryPoint class MainActivity: AppCompatActivity() { Fragment annotation: @AndroidEntryPoint class...

Retrieving String value based on where condition from room database - kotlin Below is the function : getConfigurationSettingOfBattery() @Query("select configurationSetting from " + DatabaseConstant.mUserBatteriesTable + " WHERE batteryId = :batteryId") suspend fun getConfigurationSettingOfBattery(batteryId: String) I have created below function to get the String value from a table or an entity: suspend fun getConfigurationSettingValue() { try { //Inserting log data in batteryDetails table. var configValue = prefManager.getConnectedBatteryId()?.let...

google support for kotlin in android development As we now Google announced in 2017 first-class support for Kotlin. But what does it change? Is there more documentation for new features written in Kotlin language? How does it affect Java? My another question: Are Kotlin written aps generally faster?(on Android device)

java.lang.RuntimeException: Cannot create an instance of class com.example.breatheeasy.userinterface.viewmodels.MainViewModel So i've started to get the following error on a Fragment and ViewModel that was previously working fine java.lang.RuntimeException: Cannot create an instance of class com.example.breatheeasy.userinterface.viewmodels.MainViewModel The code for the ViewModel in question is class MainViewModel @ViewModelInject constructor( private val mainRepository: MainRepository) : ViewModel() { val runsSortedByDate = mainRepository.getAllRunsByDate() fun insertRun (run : Run) = viewModelScope.launch {...

I created an app like online shopping for college project I face the problem real time updating in cart [This is the problem I face, when I update the product quantity the price updated in the top but not in the bottom,here my code and what should I fill in the pending area` override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) { (holder as ViewHolder).bind(cartItems[position]) holder.itemView.decrement_in_cart.setOnClickListener { val count = holder.itemView.cart_item_count.text.toString().toInt() if(count >= 1) {...

Not able to use setOnClickListener on button through button id in Kotlin I want to use setOnClickListener by the help of Button's id in Kotlin but when I try to do so I am getting an error. MainActivity.kt class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) btnDatePicker.setOnClickListener { } } } XML file activity_main Here I am getting error in main.kt that btnDatePicker is not defined. Please help me to resolve...

Why do I get a nullpointer exception in my unit test? So I'm trying to use a repository pattern in my app. I'm trying to test the data fetched from the API in my unit test. So far this is my code for my unit test: private lateinit var viewModel: SearchResultViewModel private lateinit var repository: Repository private lateinit var remoteDataSource: RemoteDataSource private lateinit var search: String @Before fun setUp(){ remoteDataSource = RemoteDataSource() repository = Repository(remoteDataSource) viewModel =...

How to add two dots for each nth character? I am developing an Android NFC application. This application can scan an NFC tag (here I have an NXP NTAG 5 boost tag, which is an NFC Forum Type 5 tag). Since the UID of the NFC-V tag is reversed, my goal is to display the (re)reversed UID of the NFC tag, where each byte is separated by two dots. Below is the method I use to do this. It reverses the UID well and converts it to hexadecimal well but I can't figure out how to insert a ":" separator every other character. fun...

Show multiple registered user`s location on the same map (Android Studio, Firebase, Kotlin) So my app shows my location on the map, and it also saves the latitude / longitude onto Firebase. This is how it looks like: The current path of my user location is just "/users/userlocation". However, I want to save "userlocation" under each user, then I want all these markers to be shown on the same map which I already created here: MapsActivity: private lateinit var map: GoogleMap private val...

How to embed my Jupyter Notebook into Kotlin app? I want to create a Kotlin app that gets text input and predicts emojis. I have done the machine learning part in Python in Jupyter. How can I turn the notebook into a mobile app?

Is there an easy way to call parent super function from inner class? I have the following code class DrawingActivity : AppCompatActivity() { private inner class ImageInfoObserver : Observer { override fun onChanged(imageInfo: ImageInfo?) { // Is there a way to perform DrawingActivity.super.finish() ? superFinish() } } fun superFinish() { super.finish() } override fun finish() { ... super.finish() } Currently, I need to specially create superFinish() function, in...

How to order the elements of a mutableList in kotlin in a custom way I'm trying to create a list of objects in kotlin, but I need the order to be defined by the user, that it can be ordered in any way chosen by the user, but I don't know how to achieve it. How can I do it?

Recyclerview onClick Listner not working via databinding I am trying to use data binding to bind recyclerview with a custom adapter and handle its onClick event via an interface which is then implemented by the MainActivity although the recyclerview inflates correctly when I try to use the onClick method it's not triggered in the main activity.I have recyclerview insde a fragment . Recyerview xml interface interface IMainActivity { // fun onLoginButtonCLick() fun onRegisterClick() fun...

How to get data asynchronously Means in IO thread from room database and update UI using on Main thread using Flow or LiveData in kotlin? I want to use observer in the activity on the list getting from room database, and fetching data should be in IO thread (should run Asynchronously) Currently I am not using coroutine with While fetching data from room. below is my code in DAO @Query("SELECT * FROM grocery") fun getAll(): LiveData in Repository class

lateinit var groceries: LiveData

init { groceries = groceryDao.getAll() }

in ViewModel

lateinit var groceries: LiveData init...

What's an inline constructor in Kotlin? First of all I have to clarify I'm not asking what's an inline function is or what's an inline class is. There's nowhere in Kotlin Language documentation or specification any reference to an inline constructor but if you look in Arrays.kt source you see this class: <a...

Usage of ? and !! in android development I know why do we use ? and !!.if we are sure about our variable does not come null we use !! and if might be null we use ? but in which states in android development we use them .I don't understand because I saw examples on internet they just show making a variable null and show something thanks for helping

Jetpack DataStore Type I'm actually using hawk lib I'm my project (https://github.com/orhanobut/hawk). But it's deprecated as I can see and I changing to JetPack DataStore (https://developer.android.com/topic/libraries/architecture/datastore?hl=pt-br). As I can see, the best alternative is to use the Proto DataStore option to...

Android Kotlin does spinner_listener run through during initialize? I write a kotlin app and wonder, why the code runs through the listener during initializing it. I try to explain the question with my code: class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) findpath() //check, if Dateien existieren, sonst create in function checkOrCreateFiles() binding = ActivityMainBinding.inflate(layoutInflater) var view = binding.root...

Retrofit is returning blank OMDBapi in Kotlin I am trying to retrieve movie data from OMDB api but always returns empty. I tested the link in the browser and it is working but when I call from retrofit with Hilt, nothing happens. Where am I getting it wrong? this is the link http://www.omdbapi.com/?apikey=e34a581&s=batman below is my code AppModule @Module @InstallIn(SingletonComponent::class) object AppModule { @Singleton @Provides fun...

How can I use glide in fragment with kotlin? I have a fragment and in "onViewCreated" I'm calling Glide.with(requireActivity()).load(user.image).into(ivChannelImage). I've tried Glide.with(requireContext()).load(user.image).into(ivChannelImage). It gives me java.lang.reflect.InvocationTargetException. ivChannelImage is an ImageView. How can I fix it?

Auto Scale Text View don't return to max size I have simple calculator with auto size text view as below. When I put many many digits it works perfectly and digits are smaller for big numbers. Problem is when I delete some digits or whole number. The size of digits leave small and I need to reset app to go back to default max size. How to fix it to make digits big again ?

How to watch item click on fragment initiate by FragmentStatePageAdapter from fragment that holds viewpager I have a Fragment(InsiraDocumentosFragment) that has a viewpager and in that fragment I initialize an adapter(InsiraDocumentoAdapter) to initialize the viewpager. The adapter(InsiraDocumentoAdapter) initializes generic fragments (DocumentoFragment) that I update dynamically, I can now update the image that is shown inside it, but I need to get the click on that image to either change it or to remove it, but this needs to be done in the Fragment that contains the viewpager, because is in this...

Call EditText's onClick event, when clicking inside of the layout it is in I've written a custom layout made up from a Linear Layout, A TextView, an EditBox and another TextView. What I want to do is, when I click anywhere on the layout (it might be the edit box, or the textviews), to call the EditText's onClick event. I can get focus to it, by setting layout's onClickListener. val customLayout: LinearLayout = findViewById(R.id.custom_layout) customLayout.setOnClickListener { val editBox : EditBox = findViewById(R.id.edit_box)...