Android Studio RecyclerView androidx.constraintlayout.widget.ConstraintLayout cannot be cast to android.widget.TextView I just started learning Android apps in Android Studio using Kotlin Programming. When I want to create a simple RecyclerView example. I encounter bugs when using the recycler view adapter. I have followed few tutorials online but the bug still exists in the code. I think the bug comes from the GameFragment.kt where it needs to set the layout manager (the below is the code related to initializing the recycler view). val adapter = GameAdapter() binding.recyclerView.adapter = adapter val...

Kotlin : How to update a value of a RecyclerView I want to update at any time some values in my RecyclerView. Here is my data class ParameterText: data class ParameterText( var parameterName: String?, var parameterValue: String? ) Here is my ViewHolder class ParameterTextViewHolder: class ParameterTextViewHolder(itemView: View) : ViewHolder(itemView) { val parameterName: TextView = itemView.findViewById(R.id.parameterName) val parameterText: TextView = itemView.findViewById(R.id.parameterValue) } Here is my Adapter (in my...

Android Drag and drop objects relatively I am working on a project where need the movement of object over the image. The object movement should be relative. so Is there any suggestion for me, where should I start from. I want to achieve the above thing

How to hide navigation bar, status and action bar in kotlin I am using this code but only navigation bar hides except it nothing hides window.decorView.systemUiVisibility = View.SYSTEM_UI_FLAG_IMMERSIVE window.decorView.systemUiVisibility = View.SYSTEM_UI_FLAG_FULLSCREEN window.decorView.systemUiVisibility = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION actionBar?.hide()

How to execute same function for multiple objects in parallel using coroutines in android My problem : i have a function to get name,icon,etc like details of an app from its application info and add the fetched info in a list like : void getAppInfo(ApplicationInfo info){ .....do some heavy work.... ...add the results in a list... list.add() } So i want to run this function for multiple info type objects in parallel to fetch the details of all apps faster using coroutines. Actually i have a list of all installed apps and want to pass these apps application info to...

Kotlin CoroutineScope not working - JavaFx (with TornadoFx) Right now, I'm having a problem using Kotlin Coroutine in JavaFx (with TornadoFx). The problem is that my CoroutineScope is not working after Kotlin init block + launch extensions with some CoroutineContext is not working too. My View abstract class. abstract class View( title: String? = null, icon: Node? = null ) : tornadofx.View(title, icon), CoroutineHandler, Injectable, Cleanable { val viewScope: CoroutineScope = CoroutineScope(SupervisorJob() +...

JPA Query Postgressql Issue I have the following query defined in a CrudRepository: interface RoundRepository : CrudRepository { fun findByGameId(id: Long): Round? @Query("select r from Round r where r.game.id like ?1 order by r.createdAt desc") fun findLastByGameId(id: Long) : List } Game and Round Entities are defined as follows: @Entity class Game( @ManyToOne(optional = false) @JoinColumn(name = "firstplayer_id", referencedColumnName = "id") var firstPlayer: User, @ManyToOne(optional =...

Android Kotlin Room Repository unable to retrieve row from within ViewModel In a previous question (Android Kotlin Room Repository unable to retrieve row from within detail activity) I described my app that displays a list of walking routes (downloaded from the cloud) in a RecyclerView and, when a route is selected I want to display all details of the route - a simple Master-Detail app. I have most of it working fine using a Room database and a Repository. The database is correctly populated and the...

Need help to generate table dynamically android i have a requirement to generate table dynamically in android. can someone help me to generate this ui and the value of rows in table will dynamically increase and decrease. I'm using Kotlin for coding.

StateFlow collect emit NullPointerException My repository layer have a MutableStateFlow, collecting it in my ViewModel. I am getting this NPE on some user devices Fatal Exception: java.lang.NullPointerException at a.b.c.ui.viewmodel.HomeViewModel$collectFlowState$$inlined$collect$1.emit(HomeViewModel.java:189) at a.b.c.ui.viewmodel.HomeViewModel$collectFlowState$$inlined$collect$1$1.invokeSuspend(HomeViewModel.java:12) at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(BaseContinuationImpl.java:33)...

Firebase Realtime Database Accept Friend Request (Kotlin) I was trying to do a chatting app. And i created a rvUsers where all users are shown. I can even send friend requests via Firebase Realtime Database. But i cant get the data which shows that user has sent a request, and change buttons to Accept Friend Request etc. My UsersFragment.kt class class UsersFragment : Fragment() { private var mUsersRVAdapter: FirebaseRecyclerAdapter? = null private var currentUserId = FirebaseAuth.getInstance().currentUser!!.uid private var FriendRequestRef:...

Can't read/write correctly in SharedPreferences with Mockk in instrumented test Trying to run an instrumented test whith Mockk in gradle I have: testImplementation 'androidx.testcore1.2.0' def mockVersion = "1.10.4" androidTestImplementation("io.mockkmockk android$mockVersion") The test is: @Test fun TestOnboarding(){ val activityScenario = ActivityScenario.launch(OnboardingActivity::class.java) onView(withId(R.id.bottom_nav_right_button),isDisplayed())) } The precondition to run successfully this test is that this method must returns false: public boolean...

How can i extract a DTO from multiple tables in a micronaut application in Kotlin? I am trying to extract into a list of DTO from multiple tables using a Native query but the documentation is just not helping. Here are the two entity classes : @Entity @Table(name="addresses") data class Addresses ( @Id @Column(name="address_id") val address_id:Long=0, @Column(name="address_name") val address_name:String="", @OneToOne @JoinColumn(name = "emp_id") private var pos: Employee? ) import...

OnClickListener is not working inside my adapter class I looked at many solutions posted online but they couldn't solve my problem. Probably the adapter position is returning -1 but why. Can anyone suggest me a solution for this? I am Posting my Code snippets below and thanks in advance for taking your precious time in answering my questions. java.lang.ArrayIndexOutOfBoundsException: length=10; index=-1 at java.util.ArrayList.get(ArrayList.java:439) at...

Getting an "Unresolved reference" error for an editText id in main activity I have just started Android Development with a basic app which takes the username and display in Toast but came across an error in the main activity. It says "Unresolved references: editName". I tried making the app again, manually importing editText widget and changing the id name but nothing works. It would be great if someone can tell me what's going wrong.

How to load the elements ready from a Jsoup Query in a RecyclerView in a fragment? I am using Jsoup and GoogleNews to show some news in a Recycler view. I have used this tutorial and I've able to to show the results in the RecyclerView but depending of the quantity of news related to the search it takes several seconds to show all the results. What I would like to do is show each element in the RecyclerView...

How to implement ZenPolicy rules? Does anyone here know anything about ZenPolicy and how to implement a rule? I am trying to replicate the Do Not Disturb setting where calls are not allowed through, but exceptions are possible, eg. Media sounds, Touch sounds etc. I have managed to disallow calls but when I toggle the exceptions settings (from my app), this reverts to "starred contacts only". I am attaching a screenshot of what I am trying to replicate in my app. Here is the code I am using so far: 3 -> {...

Add x axis as datetime label in MPAndroidChart? (Kotlin) I believe this question and answer explains how to format time series data into readable date labels in Java. How do you do the same thing in Kotlin?

Reified generic type ignored by Jackson I query a REST API wihch can return different data types. I'm trying to find an elegant way to parse the result into Kotlin object. My current solution, which works: data class RestResponse(val data: T?, val error: String?) data class Item(val name: String, val quantity: Int) data class User(val username: String, val dateOfBirth: LocalDate) fun item() = get("item") { object: GenericType() {} } fun user() = get("user") { object: GenericType() {} } private fun get(method: String, auth:...

adding array of recycleview with generate number when i click add button I want to make alert dialog like this [first picture][1] [after click button "tebang" screen will be show alert dialog like this[2] [after click button "+" array of recycler view is added][3] Everyone help me please, because i don't get reference to make this view. Thank u [1]: [2]: <a href="" rel="nofollow...

Random code 400 (bad request) response from Retrofit 2 call in Android I am using Retrofit 2 to communicate with a server. It works correctly sometimes, but occasionally (and quite often), it gives me response 400 (Bad request) to the same request. Usually I am getting bad request response after 4-5 consecutive call. I am using a loop to make continuous API call until list mark empty. Is there any idea why it’s happening and how I can fix this issue? Thanks in advance

Quarkus: REST resource can't find entities created in test I'm trying to create a test for a REST resource I've created with Quarkus, Panache & Kotlin. The test first writes a few entities to the database and then performs a REST call that should return these entities. However the REST resource can't seem to find the entities. If I query the database directly in the test, the entities are there. My code looks like this: @Entity open class TestEntity : PanacheEntity() { companion object : PanacheCompanion { fun createTestString(): String...

Can't estabilish simple mysql connection Kotlin I've made simple connection object. Added mysql connector jar. package com.example.dbclientapp import java.sql.DriverManager import java.sql.SQLException object Test { private lateinit var records: String @JvmStatic fun connection(): String { try{ val c = DriverManager.getConnection( "jdbc:mysql://localhost/invoices", "root", "" ) println("OK !") val s = c.createStatement() val r =...

please help, i want to call activity kotlin from java activity this my code from IntroActivity.java, and MainActivity is kotlin file ( MainActivity.kt ) public void run() { Intent intent = new Intent(IntroActivity.this, MainActivity.class); startActivity(intent); finish(); }

Incremental annotation processing requested private java.util.List farmerVillage; [WARN] Incremental annotation processing requested, but support is disabled because the following processors are not incremental: androidx.room.RoomProcessor (DYNAMIC). Entity @Entity data class ConnectedFarmer( @PrimaryKey val farmerCode: String, var farmerVillage: List ) Room Db--> @Database(entities = [ ConnectedFarmer::class], version = 2, exportSchema = false) @TypeConverters(ListTypeConverter::class) abstract class FarmerAppDb :...

How to read excel data using spring boot by Kotlin? I want to read the excel file using spring boot by Kotlin. I have searched Google, only I found is java spring boot, no Kotlin. Some one please help me on this asap, thanks for your help, I will appreciate well

I tried coding for a button to open a new intent and save data in a dynamically created button but nothing happens when I click it I've been trying to make a app that allows you to add a short answer question so when you click the plus button it takes you to a separate activity where you input your question and answer. When you're done you click the check button and you're taken back to the same activity where a new button appears with the text set to the question inputted. However, when I tested it, the button would do nothing when I clicked it. Is there anyway I can refactor my code? Newbtn page: package...

Cannot create an instance of class ViewModel class I am trying to follow MVVM pattern in my Android app but getting error while creating an instance of ViewModel. Error: Cannot create an instance of class DemoViewModel class. Here is my code: DemoFragment.kt: class DemoFragment : Fragment(R.layout.fragment_demo) { lateinit var mViewModel: DemoViewModel override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState)...

Kotlin suspend function makes fragment been popped without reason I have the following function which saves several records in a local Sqlite DB managed by Room: fun commit() = CoroutineScope(Dispatchers.IO).launch { try { //Get the serialization of all objects to update, insert or delete val tables = TablePriorityRepository().getAllByPriority() val repObjAction = ObjectActionRepository() val insertGroup = insert.values.groupBy { it.getNestEntityName() } val...

Is it possible to achieve the same efficiency of Coroutines but with Java? I had an interview today. I was asked why Kotlin is better and I mentioned that with Kotlin we have Coroutines which makes it easier and so much better to perform heavy operations but with Threads(Java), if many threads are created and running at the same time it might cause out of memory issue. And he replied, the same can be done with threads also in Java. I'm a junior developer and I recently switched to kotlin, so my knowledge is limited about this and I can't find more about the same on...