Detect if any string passed parameter is empty I'm working in android studio and I got a function that gets the values from different EditText. fun changeUserAccount( userName: String, password: String, confirmPassword: String, realName: String, accountEmail: String, applicationContext: Context ) { } I need to check if these strings are empty and if possible, wich of them is. Except the creation of different "if" cases or a "when", which is the best and most optimal way to do that?

Android FAB transform to menu As per the updated material guidelines, the floating action button can transform into a menu as shown below: Can someone help me with some code or a some links on how to implement this behavior? Thank you.

couldn't call Recycler filter method from activity -kotlin I'm trying to implement search filter in recycler view but i ccouldn't call "adapter.filter.filter(newText)" from my activity i have implement the filterable in my adapter class but it shows error class Shop_stocokListingAdapter( internal var ShopList: List, private val context: Context, val token: String ) : androidx.recyclerview.widget.RecyclerView.Adapter(), Filterable { var shopFilterList = ArrayList() init { shopFilterList = ShopList as ArrayList } override fun...

android studio gitmap deprecated. instead ImageDecoder.createSource I am new to Android Development. I am trying to upload image into Firebase storage. However, I am having issue with uploading. Then I am looking at one of codes that I got from tutorial which was published 2 years ago. val bitmap = MediaStore.Images.Media.getBitmap(contentResolver, selectedPhotoUri) val bitmapDrawable = BitmapDrawable(bitmap) picture_btn.setBackgroundDrawable(bitmapDrawable) these codes are shown as deprecated. Due to that fact, inside my uploading function, following...

Bottom view cutout for rounded bottom screen corners When there is a full screen enabled from the device display setting and the phone has a rounded edge on the bottom then my buttons at the bottom cut out a little bit. I have found some reference for notch cutout but not able to find the bottom cutout. Solution Assumption: Margin at bottom >> Not fulfill my XD requirement. My buttons should be at the bottom without margin. Please refer below screenshot.

Android Studio - Kotlin Int function to string I have summary function that have two int parameters and a booelan paramater. Here is my function fun sum(s1:Int, s2Int,strBoolean = false) : Int{ if (str == false){ return s1+ s2 } else { return (s1 + s2).toString() } } this function returns of s1 + s2 but i have booelan paramater, if i set it to true ,my return will be s1 +s2.toString() but i get error in toString how can i fix it

Binding cannot be cast to binding error on navigation I use fragments with navigation in my app. I have the mainFragment class and the adminPwdFragment class. I want to go from the mainFragment to the adminPwdFragment with the press of a button on the interface. But I always get this error when tapping the button : 2020-05-16 171253.302 1423-1423/com.example.lejosremote E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.lejosremote, PID: 1423 java.lang.ClassCastException:...

Fetching photo from places api android private fun getPhotoAndDetail(id: String?) :Bitmap{ var bitmap:Bitmap= BitmapFactory.decodeResource(this.resources,R.drawable.common_full_open_on_phone) val placeRequest=FetchPlaceRequest.builder(id!!, listOf(Place.Field.ADDRESS,Place.Field.PHOTO_METADATAS)).build() placesClient.fetchPlace(placeRequest).addOnSuccessListener{ it -> val place=it!!.place val photoMeta= place.photoMetadatas!![0] val photoRequest=FetchPhotoRequest.builder(photoMeta).setMaxWidth(500)...

Error while implementing function for search in ListView I was implementing searching in a list view but failing badly, then got a peace of code from a YOUTUBE video refrence but its in JAVA but I'm working with KOTLIN when i was converting it, again i was failing. can you help me with KOTLIN code for this JAVA code @Override public Filter getFilter() { Filter filter = new Filter() { @Override protected FilterResults performFiltering(CharSequence constraint) { FilterResults filterResults =...

Why data in room automatically deleted when have a new data in Kotlin I have a feature namely draft. I already success showing draft data from room to RV as a list. And also open that data into detail page with different id (primary key), this is a success too. But the problem is, If I only have 1 data in the list draft, and then when I open it in detail page, it's showing. But when I have 2 data (for ex: data 1 and data 2), let's say data 1 it's pref draft and data 2 it's new draft. Then when I open data 1 in the detail page, the data from the room it's...

How to get Sent and Seen Status in Chat App Firebase Kotlin I need to implement sent and seen feature in my chat app. Can anyone suggest the logic for this. My Chat Structure look like this. I created two database references like from user1 to user2 and another with user2 to user1 so that i can display both the messages when two users logged in an app. --- Messages | | - From User1(userId) | TO User2(userId) | Message information |...

Text is not in front of image I want a text in front of my image, but instead I cant see the text Output As we see here, I dont see the text above the image and I dont know why

Tracking total number of steps for current day using Google's FIT API I am trying to get the total number of steps for the current day using Google's FIT API. I'm using the code from https://developers.google.com/android/reference/com/google/android/gms/fitness/HistoryClient This is the particular code snippet which I'm using from that page val response: Task? = Fitness.getHistoryClient(context,...

Access ApplicationCall in object Is there a thread-safe method in Ktor where it is possible to statically access the current ApplicationCall? I am trying to get the following simple example to work; object Main { fun start() { val server = embeddedServer(Jetty, 8081) { intercept(ApplicationCallPipeline.Call) { // START: this will be more dynamic in the future, we don't want to pass ApplicationCall Addon.processRequest() // END: this will be more...

Can use data class with init{} and Gson I have a data class data class CardHistoryModel( val serviceType: String? = null, var title: String? = null ) { init { title = when (serviceType) { "CARD_TO_CARD" -> "CARD" "CARD_TO_ACCOUNT" -> "ACCOUNT" else -> "NON" } } } I get response from the server and with Gson And Retrofit convert to CardHistoryModel.kt I need to fill 'title' variable with 'serverType' when using the above code, serviceType is null can I use...

Kotlin get runtime class from generic implementation I'm trying to build a register component that takes in a list of QueryHandlers in my application. Below you can see the queryHandler and Query definition. They both implement an interface with generics. class MyQueryHandler(): QueryHandler class MyQuery(val query: String) : Query Now, I have a component in Spring that is using BeanPostProcessor to catch the Bus bean definition and call to it the function registerQueryHandler for each of the query handler he gets in the list....

Unit Testing ViewModel with Kotlin Coroutines and LiveData? I am developing news app and I have implemented testing in my MainViewModelTest what I have tried achieve to check where I am getting the correct response from the internet or not. I already wrote that logic but I am getting more errors. I followed this this tutorial below MainViewModelTest.kt where I have implemented internet response test. class MainViewModelTest...

How to schedule something to happen on a specific day of the week I'm making an app that sends a notification at a certain time chosen by the user with date picker. The user can choose if the notification repeats daily, weekly or monthly but i would like to add a feature that the user can choose if the notification repeats on certain days of the week using the dialog. How can i achieve this? The notification would go off at the same time the user specified but only on the chosen week days. <a href="" rel="nofollow...

How to enable GPS(location )in kotlin automatically I am working on location part. So I want to enable GPS automatically in kotlin. Any help will be appreciated

recreate is in an infinite loop on a spinner I'm working on a project that works with a spinner and I wanted that when I click on the spinner option the activity would restart. But when I start running the program it will stop an infinite loop lateinit var option : Spinner var alreadyRecreated = false override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) option = findViewById(R.id.spinner) val options = arrayOf("business", "entertainment",...

Android ExoPlayer Java code working but not Kotlin I am trying to stream video content using ExoPlayer in my existing Android Kotlin project, i used Google's codelabs example in java and converted it into Kotlin. I have the Java and Kotlin in separate activities using the same XML file and everything else, however, the Java code works and the video file streams normally, whereas the Kotlin version just loads up the player avtivity but no...

Using androix backButtonPressedCallback I need to implement a custom onBackButtonPress method for Fragments. example in LogoutFragment, after logout is handled. user cannot go backStack but a message is shown like press again to exist and is exited. I used this solution. But is not working. Then I saw <a href="https://developer.android.com/guide/navigation/navigation-custom-back"...

Example of correct stubbing: doThrow(new RuntimeException()).when(mock).someMethod() I am developing a news app and I have implemented Mockito testing in MainViewModelTest.kt class but when I run the test I am getting the following exceptions Argument passed to when() is null! Example of correct stubbing: doThrow(new RuntimeException()).when(mock).someMethod(); Also, if you use @Mock annotation don't miss initMocks() at...

DAO: Decide when to flush the changes I've ran into an issue when using Exposed, I've decided to use DAO because they seem intuitive but I want to decide when to flush the changes and store them locally instead of flushing them everytime I set the value. I need this because I need to store data about a player in and I want to update it only when he disconnects. Thanks for helping!

Sharing ViewModel between three fragments I have three fragments A, B and C. B and C are child fragments of A. How do I get all three to share the same view model. From this medium article, this is what I should do: viewModel = activity?.run { ViewModelProviders.of(this)[SharedViewModel::class.java] } ?: throw Exception("Invalid Activity") } However this one is about sharing a...

Flag being modified twice after ``awaitAll()`` being called on a list of async coroutines I'm not getting why the flag is being set twice to true in this init function // flag being initialized to false init { // todo check viewModelScope.launch(context = IO) { val deferredList = listOf( async { loadUser(id) }, async { loadImg(id) } ) deferredList.awaitAll() flag.postValue(true) } } Shouldn't awaitAll wait for the two tasks being completed?

Issue loading tensor flow model in java I am running this code to load up this model (extracted form a tar) https://tfhub.dev/google/albert_large/3 println(TensorFlow.version()) val modelBundle = SavedModelBundle.load("./albert3") graph = modelBundle.graph() hasRun = true and I am getting this error Tensor :0, specified in either feed_devices or fetch_devices was not found in the Graph java.lang.IllegalArgumentException: Tensor :0,...

Firestore metadata get method doesn't succed I have an issue with Firebase's Firestore in my app, based on a MVVM architecture. When I try to get an object from a document reference, the addOnCompleteListener never succed (neither the other listeners). Here is my code of ItemRepo.kt in wich I call the get method to my document reference. NOTE: myDocRef is called in the init of the viewModel and is ordered by those two fields. I've tried to use directly that reference and also a new one, local in the function getMyItem private val...

How To Move Activity Form Fragment "Kotlin" how do you move the activity from the fragment? using kotlin btnGlobal.setOnClickListener { val intent = Intent (getActivity(), Main2Activity::class.java) getActivity()?.startActivity(intent) }

How delay function is working in Kotlin without blocking the current thread? Past few days I am learning coroutines, most of thee concepts are clear but I don't understand the implementation of the delay function. How delay function is resuming the coroutine after the delayed time? For a simple program, there is only one main thread, and to resume the coroutine after the delayed time I assume there should be another timer thread that handles all the delayed invocations and invokes them later. Is it true? Can someone explain the implementation detail of the delay...