MultiSelectListPreference keeps old values. Is it a bug and what can be done? I wrote a MultiSelectListPreference in xml as follows and used it in a PreferenceFragment: And the array is a b c When in the UI checking all choices, the result in preferences file is a b c Now changing the array to be A B C and going to preferences UI again. The user sees only the new choices, and if checking all choices the resulting preferences file is a A b B c C And if unchecking all choices the result is...

Jetpack compose lifecycle viewmodel: -> unresolved reference: compose I copied over the code from this website to play/pause an audio with a single button which changes icons: https://semicolonspace.com/android-compose-music-button/ First I got this error: Jetpack Compose - Unresolved reference: observeAsState but the first anser of the question resolved...

Picasso showing image on physical device, but not on emulator--why? override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) { val message = messages[position] if (holder is MeViewHolder) { holder.textViewMessage.text = message.message } else if (holder is SenderViewHolder) { holder.textViewMessage.text = message.message Picasso.get() .load(message.user.profileImage)...

How to start a startForegroundService using WorkManager Hi due to issues with startForegroundService not able to run in the background on certain android version. I am trying to startForegroundService using a WorkManager but unable to get it to work. this is what I tried so far. Forground service that needs to start ContextCompat.startForegroundService(context, CarInfoProcessingService.createIntent(context = applicationContext, pushMsgData = message.data)) class that starts the foreground service class BackupWorker(private val...

How to use reified with a class with generics If I have a class like the following: class SimpleClass { var test: Int = 1 } I can do something like this: inline fun myFunction1(): T { //Do something with T } But if I have a class with generics: class ComplexClass { var test: T? = null } How can I do the same? The following doesn't work: inline fun myFunction2(): T { //Do something with T //Do something with C } How can I do it?

Hide the system's own bottom navigation - elements should be arranged at the bottom everyone. I have an app in which I hide the navigation bar and show a bottom navigation. If I hide the former, the navigation should be at the bottom edge. how can I do this? My layout file for the navigation: Code for hiding: currentApiVersion = Build.VERSION.SDK_INT val flags: Int = View.SYSTEM_UI_FLAG_LAYOUT_STABLE or View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION or...

Turning the screen off in android I am trying to make that on a push of a button, the screen will turn off. (same action when pressing the physical button on the phone to turn the screen off) I saw some answers in different posts, but they are very old and not working. I tried using wakelocks and powerManager, but all sulotions I found are deprecated now.

Scroll position of LazyColumn or LazyRow in pixel? I want to detect scroll position of my LazyRow. For example I scroll 2000px in a LazyRow and then navigate to another screen and come back. when I come back, LazyRow is scrolled 2000px and state is saved correctly. However I need that initial 2000px scroll position. how can I achieve that? rememberLazyListState().firstVisibleItemScrollOffset As shown above, LazyListSate only gives firstVisibleItemScrollOffset and not the whole scrolling position.

Increase hexadecimal places I'm trying to increase the number of places a hexadecimal is using. I've managed to do this when I'm using String, by using String.format("%04X", bytes). But my source is of ByteArray and I would like to avoid partially converting it to String, change the number of places and then convert it back into bytes. So the idea is in my source I have something like this 0D which I want to be 000D in my final representation. But I want to achieve this before fully converting my source to hex...

What are the benifits of using Higher order functions in Kotlin? I am learning about higher order functions[HOF] and lambda in Kotlin. I checked the Kotlin docs but didn't understand it, I found one benefit of HOF: You can perform any operations on functions that are possible for other non-function values. so, What are 'non-functional values'? and What are those 'operations'? In a higher order function if a lambda is taking two parameters and returning a value, then can't we...

How do I setup and retrieve the authorization code? So I am using seatgeek api. The grant type is an authorisation code. Therefore you are provided with an authorization url. This authorization url will then redirect user back to the redirect url you created.This time with the code appended to it. Next you will use this code to retrieve the access token. The authorization url is <a href="https://seatgeek.com/oauth2?scope=offline_access,&amp;client_id=xxxxxxxxxxxxxxxxxx" rel="nofollow...

Not able to access image from intent after close and open the application again (android) I've been trying to build an app that is able to recover a photo from the gallery and use it in a recycler view with some content information previously registered. I'm able to recover this photo normally, set it into the recycler view but when I close the app and open again, I receive the message saying that I don't have permission to access this content. java.lang.SecurityException: Permission Denial: opening provider com.android.providers.media.MediaDocumentsProvider from...

Detect if Expedited is OutOfQuota for WorkManager Android When use WorkManager with one of these: .setExpedited(OutOfQuotaPolicy.RUN_AS_NON_EXPEDITED_WORK_REQUEST) .setExpedited(OutOfQuotaPolicy.DROP_WORK_REQUEST) At this time, I want to detect if the device could not run as expedited. Is it possible to Try-catch or any other ways to detect when OutOfQuota? Thank you.

how kotlin open a file with onlcick button i just want to open the file in kotlin. i google it, most of the code use startActivityForResult but it is depricated. so i found this one // get reference to button val btn_csv_me = findViewById(R.id.btnCSV) as Button // set on-click listener btn_csv_me.setOnClickListener(object : View.OnClickListener { override fun onClick(view: View?) { val...

How to fetch Json data directly from webview link android studio? I developed android app using kotlin and iam able to open webview also but iam unable find json data in logcat from website link? there is no api in middle. I want fetch data from random website directly with url? there is no (key, value)? not json url.

Kotlin multiplatform project error only in android When I start my android emulator I get this error after a few seconds: E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.android, PID: 23405 java.nio.channels.UnresolvedAddressException at sun.nio.ch.Net.checkAddress(Net.java:107) at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:663) at io.ktor.network.sockets.SocketImpl.connect$ktor_network(SocketImpl.kt:44) at...

Usb device is null even when plugged usb cable to mobile Try to get usb device when plug phone. I tried to plugged in computer with mobile and also plugged-in mobile power charge. But always device return null. I don't know if it's problem because of permission. I saw few similar questions that about device get null always. But can't see any solution. AndroidManifest.xml device_filter.xml MainActivity.kt class MainActivity : AppCompatActivity() { private val ACTION_USB_PERMISSION =...

Control item to add I can't get the items already on the screen to be added again. I would like to put a check to ensure that if they are already present it does nothing, otherwise it adds the new ones. Thanks in advance I tried to search online but maybe I'm doing something wrong in the search...

Abrupt process termination in Java [duplicate] It's possible to terminate program execution in Kotlin using exitProcess(n) function: if (n < 1 || n >= 20){ println("Number out of range") exitProcess(n) } where n is the value that cause the program to exit. It's not possible to use break because its not inside a loop and the method has no return value, it is void and hence I can't use return. What is the equivalent function in Java for exitProcess(n)? It works in Kotlin but I'm writing in Java but unable to find an equivalent function in...

JavaFX - Kotlin how to change values in Spinner? everyone. So I have a Spinner, and I can't figure out why the values in it are not changing. This is my code for the SpinnerValueFactory, this code is located inside the init{...} function val spinnerValueFactory: SpinnerValueFactory = SpinnerValueFactory.IntegerSpinnerValueFactory(1,100); spinnerValueFactory.value = 1; ageSpinner!!.valueFactory = spinnerValueFactory; And this is my Spinner declaration. @FXML private var ageSpinner: Spinner? = null; When I run the program, the spinner...

Capturing a camera snapshot on Android in Kotlin I would like to take a picture from the front camera and save it to a variable as a bitmap or as an array of bytes How can i do this?

Recyclerview empty when changing data class My app is working fine when using the data class that i'm currently using from an online exercise: https://android-kotlin-fun-mars-server.appspot.com/. But when I try to change it to my own data class and json file (https://opendata.visitflanders.org/tourist/activities/breweries.json) This is...

Android: I am trying to access the button using id name in main activity but its showing an error class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) createBirthdayButton // This is not working } Here id name is "createBirthdayButton" but i am not able to access it in my Main Activity class

Kotlin multiplatform can't a find static library, even when I specify an absolute path Here is my .def file: headers = /Users/semyon/Projects/SortedMapKotlinMultiplatform/src/nativeInterop/cinterop/jsw_rbtree.h staticLibraries = /Users/semyon/Projects/SortedMapKotlinMultiplatform/src/nativeInterop/cinterop/jsw_rbtree.a package = jsw_rbtree When I copy this /Users/semyon/Projects/SortedMapKotlinMultiplatform/src/nativeInterop/cinterop/jsw_rbtree.a and execute in terminal it outputs Permission denied, what is expected, it indicates, that the file exists. After trying to rebuild...

How can I darker in ImageView I need to change the image programmatically setting an type of "darker". I need do that bacause the text view in the recycler view need to be in contrast with the background image. How can I put this effect? I need something like this

why DataBase Dao can`t does this query?(android) I made a project with room data base library but I have a problem at dao data base when i want select all data from data base, dao cant does this and gives me two error: at com.pOable.note.MainActivity.getDao(MainActivity.kt:20) at com.pOable.note.MainActivity.onCreate(MainActivity.kt:25) MainActivity.kt20 lateinit var Dao: Dao MainActivity.kt25 binding = ActivityMainBinding.inflate(layoutInflater) and this is my dao: @Dao interface Dao { @Insert fun...

what oboe stop call back after the first video end and the second starts When we add two videos oboe stop call onAudioReady function, it stoped after the first video end so the second video is playing with out sound I try to print a log inside fir callback but there is no think happen

show legend on PieChart im trying to display my data on Piechart on my Kotlin app using EazeGraph library EazeGraph i want when i click on slice ( or display it automatically ) it display to me the data of this slice in a legend or text kotlin code pieChart.addPieSlice( PieModel( "All Members", stats.countAllmembers!!.toFloat(),...

Android: WebView inside of appBarLayout unable to scroll I have an activity which I will show xml for below, containing a webView inside an appBarLayout. Now to be frank, I don't know where the appBarLayout came from because I dont remember adding it in. But anyways, the screen has stacked in the following order top->bottom: a textView, a videoView, and a webView. So the HTML being displayed in the webview is only maybe the bottom half of the screen. Below the xml snippet, I have a image of how this looks from the design POV. The closest I ever got...

Long-run task with WorkManager at android 12+ According article, WorkManager can execute more than 10 minutes (long-run). In order to do this, we need to call setForeground. And the same time, android 12 and higher restrict start foreground services. How to execute long-run task on android 12 in such case? In my case, AlarmManager fire at target time and set OneTimeRequest for WorkManager. I want to use setForeground just...