How to get an unbound reference to function in Kotlin In java you can write the following code: Animal anim = new Animal(); Method method = anim.getClass().getMethod("dynamicOnBind"); and then invoke it with any object (reference) that i want. Let's say with a new Animal: method.invoke(new Animal(),"dynamicOnBind"); But in Kotlin the follwoing link: https://kotlinlang.org/docs/reference/reflection.html#bound-function-and-property-references-since-11 <a...

haw i can add a new text style for my app in android studio? [enter image description here][1]i need to no haw i can add a new text style to my app in android studio ,i was try that one but it does not work

How to programatically skip transition in motion layout and start a certain constraint set I am pretty new to motion layout in Android and I have been wondering how I can skip the transition to state and start a particular constrain set this being the android:id="@+id/start_budget" I have tried following the given steps in the following solution but I it did not work , and I am wondering is there a special case for motion layout? <a href="https://stackoverflow.com/questions/45263159/constraintlayout-change-constraints-programmatically">ConstraintLayout: change constraints...

No Callback from MediaSessionCompat.Callback() I have stared tirelessly at the documentation that android provides for the MediaButtonReceiver class (https://developer.android.com/reference/kotlin/androidx/media/session/MediaButtonReceiver?hl=en) and the guide on responding to media buttons (<a href="https://developer.android.com/guide/topics/media-apps/mediabuttons" rel="nofollow...

Only collect nested objects of a json API response I have a project that uses Retrofit and Moshi. The API I'm using provides a response along these lines: { "response": { "nameObjects": [{ "name": "Name 1", "number": 123 }, { "name": "Name 2", "number": 456 } ] } } As a result my model looks as follows: data class ApiResponse(response: Response) data class Response(nameObjects: List) data class NameObject(name: String:...

How to get Methods from KClass in Kotlin In java when i have a Class instance, i have the getMethod that return a Method and it is very easy to use. As i can see Kotlin makes life harder because such a method doesn't exist. is there a nice way to get a specific method beside of turning the KClass to Class and then using it exactly as in Java?

How to implement clicklistener on adapter on kotlin wiouth null listener? I am trying to implement a listener on a recyclerview adapter. the thing is that I have donde that other times and it works fine, but this time it does not. The adapter is call from a popupview, could that be it? this is where the debug shows me the error on the adapter class override fun onCreateViewHolder(parent: ViewGroup, p1: Int): CarListItemViewHolder { //inflate view val v: View = LayoutInflater.from(parent.context).inflate(R.layout.adapter_car_list_item, parent, false)...

Error using Ion, RecyclerView and SwipeRefreshLayout with NewsAPI I am using Ion to populate my app with news articles from NewsAPI. I am also trying to incorporate a SwipeRefreshLayout method to refresh these articles. I'm not entirely sure what I'm doing wrong in my code however when I compile the app, initially no articles show, however when I click into the searchbox in my app, the articles suddenly appear. Here is a part of my code: val list = ArrayList() override fun onCreateView (inflater: LayoutInflater, container: ViewGroup?, savedInstanceState:...

how do i return the number of elements in the array in kotlin? Im trying to return the number of items in an array list but its not working this is my code: override fun getItemCount(): Int { val list = ArrayList() val ref = dbSavedStories.child(currentUid!!) ref.addValueEventListener(object : ValueEventListener { override fun onDataChange(snapshot: DataSnapshot) { for (childSnapshot in snapshot.children) { val key = childSnapshot.key list.add(key.toString()) }...

AudioSystem downloads partial file I'm trying to download a file using AudioSystem. However, it fails to download the complete file. I've tried with other audio files and can replicate the bug with them. I've also tried various hosting services, and it didn't help. There are no exceptions thrown. This was working correctly a few weeks ago, so I'm not sure what happened since then. Would appreciate some help since I'm not too familiar with handling audio files. import java.io.File import java.net.HttpURLConnection import...

sharedPreferences - saving background color between sessions sorry for newbie question but I'm starting with Kotlin and Android app development. Currently I'm trying to create simple Activity that will switch background colors. I add 2 buttons that are working and switching colors between white and green, but would you be able to help me how to save it between the session using sharedPreferences ? I cannot retrieve these states from the preferences. Code sample below: class OptionsActivity : AppCompatActivity() { override fun...

¿How to change the text color of SearchView? I'm trying to set the text color of the SearchViews of my app to white. I've added to my app's main theme "searchViewStyle" to define the style of every one. @color/colorPrimary @color/colorPrimaryDark @color/colorAccent @style/CustomSearchView Then I created the "CustomSearchView" style, in the same file. @drawable/ic_small_search @font/roboto @null @null @color/colorWhite @color/colorWhite @color/colorWhite And this is what I have in the...

How to set materialFavoriteButton to true if item has already been put to favorites? I'm using materialFavoriteButton (by Ivan Baranov) to add a particular item to favorites and I insert that data to my database. But when I click on that same item again, it shows that materialFavoriteButton as false or empty by default. I'm thinking that I could use sharedPreferences to check whether the item has already been favorited. If it has, then I want to set the materialFavoriteButton as true, in other words, it has to be colored in since it's already in the database. Any suggestions...

Why isn't my Android app recognizing the PNG in a sub-directory of the drawables directory? I thought I might sub-divide the drawables folder into folders for each of the screens, but now one of my XML files doesn't recognize the background image I want to use. What is the correct syntax to use a PNG from a specific folder? Side question - is this not common practice? I sense that it's not since Android Studio didn't suggest this...

Is there anything wrong in this Generic Interface or Kotlin compiler is not able to infer types? Assume we have a Adapter interface: interface EventAdapter { val event: E // ... } And a few implementations: inline class MessageCreateAdapter(override val event: MessageCreateEvent) : EventAdapter { /* ... */ } inline class MessageUpdateAdapter(override val event: MessageUpdateEvent) : EventAdapter { /* ... */ } // ... And we create an extension to the Event to get respective Adapters: fun E.toAdapter(): EventAdapter? { return when (this) { is MessageCreateEvent ->...

Noob question re: firebase-crashlytics dependency implementation Admittedly, I have very minimal programming experience and this is my first time using Android Studio so bear with me. I am looking to determine what's causing my Samsung J3 Prime to crash and Firebase Crashlytics seemed like a good route to take. I've been following the guide found here and am on Step 3, adhering to the 'Kotlin+KTX' instructions (that's just what I...

Migrating Spring Boot Applications to the Latest Java Version (Java 15) I have a spring boot project set up to use Java 8 and Kotlin. I want to migrate the project to Java 15, but unfortunately I haven't found any documentation useful for that purpose. So far i was able to upgrade my Spring boot version from 2.3.3.RELEASE to version 2.4.0 and reference the project to use Java 14 in jvmTarget based on a project example created using the spring initializr. However, I didn't the find a way to upgrade to Java 15. Any ideas would be very appreciate it. This is how my...

How to use @Parcelize now that kotlin-android-extensions is being deprecated? How do I replace annotation class Parcelize from package kotlinx.android.parcel with Parcelize which is not coming from the kotlin-android-extensions plugin?

how to set this response in recycler view dynamic in Android "seats":[ { "length":1, "id":"D", "width":1, "available": true, "fare":425, "totalFareWithTaxes":456.00, "serviceTaxAmount":25.00, "serviceTaxPer":5.8800, "operatorServiceChargeAbsolute":6.00, " operatorServiceChargePercent":1.4100, "ac":false , "sleeper":false , "row":0 , "column":0 , "zIndex":0 , "commission":null , "ladiesSeat":false, "bookedBy":null }, { "length":1, "id":"2", "width":1, "available":true, "fare":425, "totalFareWithTaxes":456.00, "serviceTaxAmount":25.00,...

How to use interfaces as listeners from and Dialoge in Android? Good morning Ladies and Gentlemen, I have a really big problem and can't go on. I don't know how I can use a interface in android as an event listener. I defined an interface ProfilePictureTakenEvent with the method onProfilePictureTaken. In an dialog, which is opened by a button click on a fragment, the user can take an Image with the camera. I used the method startActivityForResult for it. The result (the image) of this action I get in the fragment (the overriden method onActivityResult)....

How to get the same html-string from EditText that i put it there I try to use html-tags for my text in EditText and I want to save it in Room database. So I created a string with html tags like that: EditText.setText("Hi there".parseAsHtml()) It works, but when I try to get it back from the EditText like that: EditText.text.toHtml() I get this: Hi there Why EditText changing my tags and adds something else? I don't need "p" and "span" tags at all. What am I supposed to do? How to get my original string back from the EditText?

Room Database App Crashes When No Data Exists I am working on Android Application in Which I am getting specific Data from Room Database by specific path in the Storage. My App Got Crashes as It does not have Any Data in the Storage and the Logcat gives me this.. java.lang.IllegalStateException: Room cannot verify the data integrity. Looks like you've changed schema but forgot to update the version number. You can simply fix this by increasing the version number. at...

Code for sending ArrayAdapter to another activity? As we can send String type to another activity like this public static final String EXTRA_MESSAGE = "com.example.android.twoactivities.extra.MESSAGE"; what should be the code for this private static final ArrayAdapter LIST_OF_CUSTOMERS = P.S.- I am writing this code in MainActivity and want to send Database in the form of ListView to another activity named saveScreen

How can i use KLIPS (Kotlin Language Integrated Production System) for an Android App? https://github.com/vjache/klips - (inspired by C Language Integrated Production System = CLIPS) I tried to include this library to gradle like this: implementation "org.klipsklips1.0" But it doens't work. Anyone know if it's possible to solve this and use the klips in android?

Sorting comment and reply based on parent value in array list I have a list with comments and replays. if a comment is a replay it is identity with parent value. This is my list: sortedComment.add(CommentTest(1, 0)) sortedComment.add(CommentTest(2, 0)) sortedComment.add(CommentTest(3, 0)) sortedComment.add(CommentTest(4, 1)) sortedComment.add(CommentTest(5, 2)) sortedComment.add(CommentTest(6, 3)) sortedComment.add(CommentTest(7, 6)) sortedComment.add(CommentTest(8, 6)) sortedComment.add(CommentTest(9, 2))...

How to overwrite status codes in swagger-ui generated by jooby I have approximately the following API using jooby v1.6.8: class App : Kooby({ fun functionWhichReturnsUnit() {} path("/my/api", () -> { /** * * Endpoint which returns nothing (status code returned: 204 No Content) * */ post("/post/something"){ functionWhichReturnsUnit(); Results.noContent(); } /** * * Install API Doc and export your HTTP API: */ use(new ApiTool() .swagger("/swagger") ); } The problem I...

ElasticSearch how to set specific index for a QueryBuilder (Java API) I'm trying to convert this multiple GET operation of elasticsearch into the Java/Kotlin code equivalent curl "localhost:9200/index1, index2/_search?pretty=true" -d '{ "query" : { "bool" : { "must" : [ { "indices" : { "indices" : ["index1"], "query" : { SOMETHING1 } } }, {...

Firebase In-App Messaging messageClicked not working Android Kotlin I am using Firebase In-App Messaging in my project. I made firebase and application connection. I can send a campaign from Firebase to my app. It's working. But I want to add a click listener to this campaign. When I searched for the solution, I found this link: <a href="https://firebase.google.com/docs/in-app-messaging/modify-message-behavior?platform=android#implement_an_event_listener_for_card_interactions" rel="nofollow...

removeObserver not working, observer keeps being executed I have an activity that uploads pictures. Inside this activity I have following observer which is working perfectly: pictureViewModel.customCreateResult.observeForever { result -> onResponsePostPicture(result!!)} I need to use observeForever because the user sometimes navigates to other activities. This is working fine and is not the problem. When the user decides to leave this activity with the observer. So when Finishing the activity I'm calling: override fun onDestroy() {...

Kotlin compiler nullability check I'm a kotlin newby and wondering why the kotlin compiler does not recognize that my variable is never going to be null and how to get around it the nicest way possible. var myString: String? = null val myList = mutableListOf() for (element in 1..2) { if(myString == null) { myString = if(somecondition) "a" else "b" } //compiler error, cannot infer type String? to String myList.add(myString) } A little explaination and how to handle those cases the best way would be...