Prevent my fragment and list from being created every time they are displayed I'm using databinding and fragments with navigation component for the first time in my app. Everything works fine with regard to navigation and loading my list. The problem I have is this: When I'm in my list and I click on one of the items, I navigate to the item's detail fragment. But when I return to the list (onBack), the fragment and the list are loaded again, they are re-created. What I want to achieve is that the fragment and therefore the list are not recreated. That they remain in...

How to write from golang to kotlin? Hi I'm very new to kotlin so i'm bit confused to convert some part of my code to golang. I have a json like, { "w" : "a", "x" : [ { "y" : "b", "z" : 0 }, { "y" : "c", "z" : 1 } ] } and i want to put the values of x in a map. In golang i had stored the unmarshlled content in "data" which is a map[String]interface{}. fmt.Printf("Results: %v\n", data) The output of Results was w=a x=[{y=b,z=0}, {y=c,z=1}]...

one button to play and pause with media recording in kotlin I would like to know how I can do it with one button to play and pause my MediaRecorder My intention is to press the button and start recording and when I press it again it will pause and record. buttonRecordandplaying.setOnClickListener { grabacion = MediaRecorder() grabacion.setAudioSource(MediaRecorder.AudioSource.MIC) grabacion.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP)...

android MVVM activity is not the controller so in MVVM architecture even in google samples we can see things like this: class CharacterListActivity :BaseActivity() { val ViewModel: MainViewModel override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) viewModel.getData() // Bad!!! ... viewModel.state.observe(this) { state -> when(state) { Success -> { navigatetoNextPage() } // Bad!!! Progress -> {...

Android - Pass a object to a view tag with Databinding I am trying to control some states of my views with their tags. I have a sealed class with objects related with my views. sealed class AuthFieldState: BaseFieldState(){ object IdentifierFieldState: AuthFieldState() object NameFieldState: AuthFieldState() } And I'm passing this to view like this: android:tag="@{AuthFieldState.IdentifierFieldState}" But its showing me a build error: Could not find accessor AuthFieldState.IdentifierFieldState Do you guys knows how can I handle this one?

Create custom view that scrolls like the Date in Google Calendar´s Agenda I want to create a custom component that works like Google Calendar´s Agenda. Mainly, what I want is a Date on the left side that stays on top of the screen while i´m scrolling, only until the next day comes to the top of the screen. Then, the date of the previous day just scrolls as usual, and now the new date at the top of the screen is the one of the new day (It´s harder to explain than I expected... for better...

How to create bottom navigation with floating action button How to create this design I have used this code but not get expected result ic_plus.xml dimens.xml 56dp In Menifest android:theme="@style/Theme.MaterialComponents.NoActionBar" But I am getting this <a...

Kotlin / Android - images lose arrangement when animation starts (sometimes!) I'm building my first kotlin app and I've built a simple card game. I've made some card elements to design the gamecard (like card picture, card back, card text, ...). To have it more feel like a game I made a function called "karteAnim" (card-animation) which assigns an animation to the different elements of the card. It work's fine most times. But sometimes the arrangement of the elements in the card lose their position and f.e. the images are on top of each other during the animation...

Kotlin - Wondering why viewBinding makes XML root full screen I am wondering why adding viewBinding to my app, makes the XML root display in full screen when running the app. The root doesn't display in full screen in the designer view inside Android Studio. Due to the root displaying in full screen, I had to add android:gravity="center" to vertically align the childs in the center. While I don't think this should be a problem, I'm still interested in knowing why this is the case. <a href="" rel="nofollow...

Reference of a Java static method of a type parametrized class in Kotlin How to write method reference to a Java static method of a generic class in Kotlin? Example below shows that :: operator works only in case of non-generic classes (Colections in this case). However using the same approach doesn't seem to work for List interface that has a type parameter. import java.util.Collections import java.util.List fun toSingletonList(item: Int, toList: (Int) -> MutableList): MutableList { return toList(item) } fun main() { println(toSingletonList(1, {...

view.measure works only first time this code would measure parentlayout.measuredHeight with View.MeasureSpec.UNSPECIFIED to know how much tall parentlayout wants to be, then hides as many child views until parentlayout.measuredHeightparentlayout.height){ viewsList[bannerword.size-quantisihidano-1].visibility=View.GONE hidedviews+=1 parentlayout.measure(View.MeasureSpec.makeMeasureSpec(swippon.getWidth(), View.MeasureSpec.EXACTLY),...

Kotlin function as map value In Java you can have: final Map associations = new HashMap(); associations.put("first", One::new); associations.put("second", Two::new); In Kotlin this translates to: val associations: MutableMap = HashMap() associations["first"] = Supplier(::One) associations["second"] = Supplier(::Two) Without kotlin-reflect, is this the only way or am I missing something? That doesn't look so good or Kotlinish imho.

How do I define a java defined stored proc to return multiple result sets? I'm trying to define a java (written in Kotlin) method that returns multiple result sets when called as a stored procedure. Code is below. the Hsqldb website;s features page indicates that this should be possible, what am I missing? I currently get an array out of bounds error on index 1: val createProcedure = """ CREATE PROCEDURE GET_CACHED(dir VARCHAR(100), hashCode INT) MODIFIES SQL DATA LANGUAGE JAVA DYNAMIC RESULT SETS 9 EXTERNAL NAME...

callback of registerForActivityResult(RequestPermission() does not run I'm trying to request permistions as it is written in the https://developer.android.com/training/permissions/requesting . Something is wrong. In Logcat there is no Log.d output from callback of registerForActivityResult. proggy() not run from callback. It set permissions okey. But when I changed implementation 'androidx.activityactivity ktx1.2.0-alpha06' to implementation...

How to make custom toolbar menu visible for my android app? I have prepared the custom toolbar toolbar.xml file as below: Now I have created a menu directory, and in that toolbar_menu.xml file as below: Now I have included this toolbar layout in my main activity. xml with tag. After all this implementation I have set the toolbar in MainActivity.kt which is as below: override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main)...

Is there any way in Kotlin to add a custom function to a property inside an interface? Ultimately what I would like to do is have a class with a field inside of it that I can call a function on. I have tried extensions functions but that only extends the class definition that the field is defined as. I tried to do it in an interface but ended up with a standard function call. so, private interface Geometric{ var position: Float3 get() { return position } set(value) { this.dirty = true this.position = value } fun...

Exo Player Is it possible to dynamically play ranges of an mp3 file without clipping? I'm new to the audio world so sorry if I'm not using the right terminology. I'm wondering if it's possible to dynamically play ranges of an mp3 file. So when I need it to I could specify a range and have only that range play from the mp3. I thought that the clipping function Exo Player has might work but I don't want to have to release the source and recreate it every time I want to move the range in the file. In my research I kept coming across this enhancement request: <a...

Why is the time incorrect when I convert from milliseconds to local time in Android? fun format(input: Long, outputFormat: String = "yyyy-MM-dd'T'HHmmss", locale: Locale = Locale.US): String { SimpleDateFormat(outputFormat, locale).apply { return format(Date(input)) } I have the following method above, when I enter the following command: println(format(1596095340000)) I am expecting to get 2020-07-29T174900 however I end up getting this instead 2020-07-30T074900 Do I have to manually do the offset myself, and if I do how would I do that? I...

why is there error, when i use querydsl in kotlin? i want to use querydsl in springboot(kotlin), but when i test querydsl by useing findOne(), there is error.. Account data class @Entity data class Account( val username: String, val firstName: String, val lastName: String ) { @Id @GeneratedValue val id: Long? = null } AccountRepository interface AccountRepository : JpaRepository, QuerydslPredicateExecutor test code @DataJpaTest class AccountRepositoryTest { @Autowired lateinit var...

Why am I getting a 400 Bad Request error with Fuel on a perfectly good request? I have this Kotlin class: package eu.fliney.spica import com.github.kittinunf.fuel.Fuel import com.github.kittinunf.fuel.core.extensions.jsonBody class API { private val urlBase = "https://alles.cx/api" fun login(username: String, password: String) { Fuel.post("$urlBase/login") .jsonBody("{\"username\": \"$username\", \"username\": \"$password\"}") .also { println(it) } .response { result -> println(result.toString()) } } }...

Calling viewModelScope only executes on first call I have a ViewModel method that executes a api call. For some reason, I can only execute this once. class MyViewModel : ViewModel() { fun apiCall() { // Function call gets here every time. // viewModelScope is not active on subsequent calls viewModelScope.launch { // Only gets inside here the first call executeApiCall() } } suspend fun executeApiCall() = withContext(Dispatchers.Default) { // Only gets inider...

Is it possible to use Kotlin's by-delegation with an existing class/object (i.e.Arrow's Either)? I have a few specialized classes that I would like to create using Kotlin and Arrow. Basically, I would like to wrap an instance of Either and use delegation to use the methods of interest. Although the following code can meet my needs, I have been trying to use Kotlin's by-delegation, but it does not appear to fit with this use case. Is it possible to change the following to use this Kotlin language feature? Thank you for your time and interest. data class EitherWrapper1(private val...

how to mock BUILD.VERSION.RELEASE using Mockk This is my code which I need to Unit Test fun getVersion(): String { return try { Build.VERSION.RELEASE } catch (e: Exception) { "Not Available" } } However, When I write the test Code using Mockk Like this mockkStatic(Build::class) every { Build.VERSION.RELEASE } returns ("1.1.1") it gives an error saying io.mockk.MockKException: Missing calls inside every { ... } block. Can someone help me with it.

How can I use the response variable outside of the Fuel.post method? I have a post method like this Fuel.post("$urlBase/login") .jsonBody("{\"username\":\"$username\",\"password\":\"$password\"}") .response { request, response, result -> val (bytes, error) = result if (bytes != null) { val jsonResult = JSONObject(String(bytes)) val token = jsonResult["token"].toString() } } I want to be able to use the result variable or the...

Axon framework, Is it possible to update subscription message using previous state Suppose I have this subscription query like this queryGateway.subscriptionQuery( FetchListOfBookQuery, ResponseTypes.multipleInstancesOf(Book::class.java), ResponseTypes.multipleInstancesOf(Book::class.java) ) so it will subscribe to list of the books in db and If I want to add a new book I would have something like this in my projection. fun on(event: BookAddedEvent){ var book = repo.save( Book(event.bookId) ).block()...

I there a simple way to get a value from string resource file for data class in Kotlin? I hope to pass a default value for var name from string resource file. The code will not be compiled because I hope to pass a Context paramter for data class MVoice(), I don't think it's a good way. I there a simple way to get a value from string resource file for data class in Kotlin? Code @Entity(tableName = "voice_table", indices = [Index("createdDate")]) data class MVoice( @PrimaryKey @ColumnInfo(name = "id") var id: Long = 0, var name: String = getString(R.String.Name) ) Untitled

When we add a new kotlin class/file in androidStudio along with main acitvity, we get xml file releated to the kotlin class/file. But When i started new project in android studio with tab layout activity instead of blank activity i tried to add a new activity along with main activity normally we get xml file added automatically when we add new Kotlin class, but here I am not getting new xml file added please let me know what we can do.

I wonder the size of bitrate and chunk of AudioRecord in Android I try to receive 10 bits of audio data per second (i.e., 0.1 seconds per bit) from Android. It sends data such as 01001011 (0: 18 kHz, 1:16 kHz) to Android using different frequencies. I want to receive exactly 1 bit of data per 0.1 second, but I don't know exactly where to change it. I had run the same project at Python, where I could change the size of chunk right away using pyaudio. (Use Chunk=4410 (=44100/10)) I thought the buffer size was simply CHUNK size of Python, but the data did not...

recyclerView won't scroll smoothly for first time I have a recyclerView inside a fragment, this fragment is located in a viewpager2. I read data from server and convert them to my ModelClass, them create an ArrayList and pas this array list to recyclerView. here is my recyclerView item layout: and here is my recyclerView adapter: class NewsRecyclerViewAdapter : RecyclerView.Adapter() { private val items = ArrayList() lateinit var...

set calendar constraints of 180 days for materialDatePicker I am using materialdatepicker for Android (Kotlin) and need to ensure that the start and end date is no more than 180 days apart. How do I write the constraints for this?