how to solve java.lang.IndexOutOfBoundsException: Index: 2, Size: 0? When there is a checkbox in the item in the recycler view, After pressing the Select All button, clicking the checkbox of the second item causes an error. I don't know how to solve this prolem?. It is said that the cause of the error occurs during build. -> data!![position].selected = checked, listener.onCheckboxChanged(position, isChecked) Lets check my code. interface CartItemListener { fun onCheckboxChanged(index: Int, checked: Boolean) } class CartViewActivity :...

Hi am trying to add onclick to list view in navigation menu.But not working I added a recycler view to the navigation view. And then Added listArray ti the recycler view. But i cant implement onclick Listener for that recycler vire items. Implementing OnNavigationItemSelectedListener is correct? please tell me how to implement onclicklistener. this is my code. in MainActivity am adding stringlist-array like this class MainActivity : AppCompatActivity(), NavigationView.OnNavigationItemSelectedListener { val recyclerview = findViewById(R.id.menuitems)...

Flutter Load Kotlin instead of Java for my custom plugin I am trying to use Flutter to develop my own plugin. I have developed a JAVA class com.talio.travel_app.FlutterNativeImagePlugin My pubspec.yaml flutter: plugin: platforms: android: package: com.talio.travel_app pluginClass: FlutterNativeImagePlugin ios: package: com.talio.travelapp pluginClass: FlutterNativeImagePlugin Then I run the following command flutter pub get The system shows error Couldn't read file LocalFile:...

Spring WebClient: Retry with WebFlux.fn + reactor-addons I'm trying to add a conditional Retry for WebClient with Kotlin Coroutines + WebFlux.fn + reactor-addons: suspend fun ClientResponse.asResponse(): ServerResponse = status(statusCode()) .headers { headerConsumer -> headerConsumer.addAll(headers().asHttpHeaders()) } .body(bodyToMono(DataBuffer::class.java), DataBuffer::class.java) .retryWhen { Retry.onlyIf { ctx: RetryContext -> (ctx.exception() as? WebClientResponseException)?.statusCode in...

In kotlin, is there any way I can stay at current fragment after I reload all the fragments? The problem I am having is every time when reloading the fragment adapter, the screen goes back to the default (first) fragment. I saw a lot of examples in Java but don't know how to solve this in Kotlin. Any solution that: 1. Allows only refreshing current fragment, or 2. Refreshes all but still stay at the current one after refreshing, either one will work.

How to take a picture without exif metadata(e.g. ModifyDate, CreateData, DateTimeOriginal) using Camera2? I want to take picture without exif metadata, such as ModifyDate, CreateData, and DateTimeOriginal. Is there any setting I can do when initializing camera2 before taking picture? Thanks.

how do i read and write an excel sheet in android studio using kotlin I want to use excel to store my data. I know I can use sqlite but I want to stick with excel. I've seen many sites which did not give me a clear idea of what should I be using, and the is no such help when it comes to kotlin. how do I read and write an excel sheet using android studio (KOTLIN)? S.S

How to make GroupBy result list to new Map in Webflux How to make GroupBy result list to new Map in Webflux There is my input list and expect result. then what should I do to make the result. // expect { "timestamp": "2019-06-13T000000.000", "result": { "first": 1, "second": 2, "third": 3 } } // input list [ { "timestamp": "2019-06-13T000000.000", "first": 1 }, { "timestamp": "2019-06-13T000000.000", "second": 2 }, { "timestamp":...

Kotlin JPQL SELECT CASE ClassCastException I am using Spring Data JPA with EclipseLink running on MariaDB. I've declared the following interface method in my repository: @Query("""SELECT CASE WHEN COUNT(tj.id) > 0 THEN true ELSE false END FROM TrackingJob tj WHERE tj.id = :id AND tj.parent IS NULL""") fun isMasterTrackingJob(@Param("id") id: Long): Boolean When calling this from code, I always get a ClassCastException: java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Boolean at...

Sharepoint conflictbehaviour fail not working I'm trying to configure sharepoint to throw an exception when an existing filename is uploaded again. I've tried to set @microsoft.graph.conflictBehavior to fail in order to do this, but my tests keeps failing because no exception is thrown. Here is the Kotlin function i use to upload a document. Any help is greatly appreciated! private fun upload(document: Document): Document { val driveItemUploadableProperties = DriveItemUploadableProperties()...

Fragment : DialogFragment but appearing as regular fragment not dialog? (kotlin) I have created a custom dialog and created its own fragment. When the fragment opens it opens like a regular fragment even though the design for the dialog is only a couple hundred pixel square in the middle of the screen? It was previously behaving like a dialog until I abstracted it to its own fragment : dialogfragment and now behaves like a regular fragment. I should mention I am navigating to the dialogfragment if that is also part of the problem here.

Calling runOnUiThread on database handler I built a function in database handler to grab data from sqlite + html page using jsoup. How can i set runOnUiThread to handle data of thread inside a database habdler function? or How can i attach returned data of thread to Activity from Database Handler file? files: -ListInvests.kt > to use DatabaseHandler function to attach data to ListAdapter -list_invests.xml > is the list items -startinvest_main.xml > is the view that will show list DatabaseHandler.kt (code of thread only)...

How to pass data from main activity to BroadcastReciever in Kotlin I am trying to pass a some value from class GeofenceBroadcastReceiver : BroadcastReceiver() to MainActivity but it doesnt seem to be working class GeofenceBroadcastReceiver : BroadcastReceiver() { override fun onReceive(context: Context, intent: Intent) { val intent = Intent(this, HuntMainActivity::class.java) intent.putExtra("nameValue", "My name") its giving an error on Intent, I also tried to write name of the Activity after this@, I am very new to coding and kotlin so...

Pre seeding Room Database is not working but database is created in Kotlin I am trying to pre-seed my database in Kotlin using Room Database. It doesn't give me any error when I Build and Run it and the database gets created but it is not seeded. Please see my code below: FareMatrix.kt import androidx.room.Entity import androidx.room.PrimaryKey @Entity(tableName = "fare_matrix") data class FareMatrix( @PrimaryKey var id: Int = 0, val entry_plaza: Int? = null, val exit_plaza: Int? = null, val classification: Int? = null, val amt_total: Int?...

Why Google Sign In Return Error Code 10 Even SHA1 Fingerprint Is Correct? I am trying to use Goole Sign In in my android app but I am getting exception with error code 10. Error code 10 means DEVELOPER_ERROR and indicates that application is misconfigured for Google Sign In. This means either SHA1 or package name is wrong at Google API Console. But I think there is no error but I am still getting the same error. Here are a few screenshots. Google API Console OAuth Credential Detail: ...

Why onTorchStatusChanged isn't called when torch is switched on? I'm wirting a class that listens to changes in torch status (flashlight), using camera2 API. I'm new to android development so I'm just trying and experimenting! The class (MyClass) is instantiated in a fragment and a reference to that view is passed (even though I'm not using it in this code right now). class MyClass (view : View){ private val cm: CameraManager = view.context.getSystemService(Context.CAMERA_SERVICE) as CameraManager private val tc:...

'by viewModels()' Kotlin property delegate unresolved reference I'm trying to implement viewmodel with kotlin. First I added the needed dependecies: implementation 'androidx.appcompatappcompat1.1.0' implementation 'androidx.corecore ktx1.2.0' // ViewModel implementation "androidx.lifecyclelifecycle viewmodel ktx2.2.0" // Annotation processor kapt "androidx.lifecyclelifecycle compiler2.2.0" Then I created a simple viewmodel: class MyViewModel: ViewModel() { val greeting = "Hello World" } But when I tried to access the view model from the...

How to change Retrofit baseUrl from shared preferences at runtime I am trying to change the Retrofit baseUrl from SharedPreferences in my app at runtime, but the change is only implemented when I close and open the app. I have tried using onSharedPreferenceChangeListener() and onPreferenceChangeListener() but I still get the same result. How do I implement the listeners so that they change the baseUrl at runtime? private val moshi = Moshi.Builder() .add(KotlinJsonAdapterFactory()) .build() private val retrofit =...

How do you resolve a 'java.lang.NoClassDefFoundError' when importing libraries in Kscript? I'm new to Kotlin scripting, and I'm trying to use Kscript to import libraries. I've been following the tutorials, and trying a very simple script (below) that imports a couple libraries. When I go to run the script, I get the below error (this error happens with any import I try to do). The script runs fine when I remove the imports. Any ideas on how I can fix the imports in my code? Error message: [kscript] Resolving dependencies... [kscript] Resolving...

Kotlin: FragmentManager is showing error when called from Fragment [working with Adapter] AdapterClass: class TeamsAdapter( supportFragmentManager: FragmentManager, teams_list: MutableList, match_id: String ) : FragmentPagerAdapter(supportFragmentManager) {code} Fragment Class: lateinit var teamsAdapter: TeamsAdapter teamsAdapter = TeamsAdapter(supportFragmentManager, match?.teams!!, matchId) Error: Unresolved reference: supportFragmentManager But the entire code works fine when inside an Activity instead of Fragment Class.

RecyclerView with Headers using different viewholder for elements in Array My Adapter Looks Like this package com.example.recyclerviewheadertest import android.service.autofill.Dataset import android.util.Log import android.view.LayoutInflater import android.view.View import android.view.ViewGroup import android.widget.TextView import androidx.recyclerview.widget.RecyclerView class MyAdapterClass(private val myDataset:ArrayList): RecyclerView.Adapter(){ val NORMAL_VIEW :Int = 1 val HEADER_VIEW :Int = 0 class SomeViewHolder...

How to call enqueue callback? I tried to use enqueue callback but it shows that as an error like "Type mismatch. Required: Callback" and this is exactly what I wrote. fun searchLocation(searchString: String){ showProgress.value = true val retrofit = Retrofit.Builder().baseUrl(BASE_URL).addConverterFactory(GsonConverterFactory.create()) .build() val service = retrofit.create(WeatherNetwork::class.java) service.getLocation(searchString).enqueue(object : Callback{ override fun...

Kotlin native serializatin setup Please, can someone help me to set up a simple kotlin native project with serialization? I followed steps from https://github.com/Kotlin/kotlinx.serialization , but I can’t add a dependency on the serialization runtime library… Source code is here: GitHub toni-megalopter-com/KotlinNativeSerializationPOC KotlinNativeSerializationPOC. Contribute to toni-megalopter-com/KotlinNativeSerializationPOC...

How to set a splash screen to last as long as my database loads? I am still relatively new to Android. I followed this codelab on Architecture Components to store around 2k objects in my database from a server. I implemented my splash screen using a layer-list (source) which entails that the splash...

When a value is declared "by lazy" in Kotlin is that phrase always optional? If I simply remove all "by lazy" initializations in a Kotlin program will the program keep the same semantics? By the same semantics, I mean program logic will remain the same, although various initializations may occur in a different time or sequence than before.

Dynamic leading text for android's EditText I've looked into using a TextWatcher and an InputFilter, but I'm not too sure how to approach this problem. The idea is to have an EditText that inserts text from right to left. As the use input changes, I would like the following to occur. - User enters "1" -> Text formats as 00:01 - User enters "2" -> Text formats as 00:12 - User enters "8" -> Text formats as 01:28 How could I approach this? Inputfilter seems to be for excluding text and using setText inside the TextWatcher appears to...

Kotlin + JPA: Reference to another object when reading but save with ID only I have a One-to-many relationship, as described below: @Entity @Table(name = "some") data class SomeEntity( val otherId: UUID, @Column(nullable = false) val number: String = "12345", ) { @Id @Column(updatable = false, nullable = false, unique = true) val id: UUID = UUID.randomUUID() } @Entity @Table(name = "other") data class OtherEntity( @Id @Column(updatable = false, nullable = false) val id: UUID = UUID.randomUUID(), ) I have no need to specify that...

How to change and save switch preference summary So I recently joined the Kotlin train, and I have a fragment which changes the theme of my android app, I made the fragment restart after successfully switching theme, and then from the MainActivity reopen the fragment using a bundle set earlier in the fragment. All these work. The problem i'm having is I also tried to change the android:summary field after switching theme, but each time the activity restarts, it switches back to the default summary value What could I be doing wrong?...

Building apps on SLOW INTERNET, is that possible? I used to try coding at my college (android studio) which had a terrible internet architecture and it wouldn't load. What I want to know: Is it possible for me to code on a bad/low internet (since I'll be on a farm) and still be fine? I'd be using VS Code + Flutter and probably Node or .Net for the project. *by bad/slow internet I mean Satellite Internet - a really slow one.

How to get max and min coordinates of View/ViewPort I have a layout bigger than screen size, with many imageviews. I can zoom it and also scroll. When I click on a imageview, the layout will scroll until the imageview gets in the center, and the layout will also zoom. Android documentation (https://developer.android.com/training/gestures/scroll?hl=pt-br) tells me to create a RectF with ViewPort max and min coordinates, but how can I do that?...