Nio http server in kotlin with coroutine I'm writing a really simple nio http server(transferring 'Hello World!' to any request) in kotlin with coroutine. Firstly, I use only one thread to handle select, read and write job. Everything goes well. Then I use withTimeoutOrNull(timeout) to limit the server from running endlessly. I set the timeout limit to 10s, while my seletor will select blocking for 3 second. ... while (selector.select(3000)...

ERROR "Could not autowire. No beans of 'String' type found" occured in spring boot Hi I'm a newbie for kotlin and spring boot I can't understand error occurred in the constructor of class of AuthorizationViewModel can anyone help me? actually I didn't know the mean of the annotation I used completely. @Configuration class AuthorizationViewModel{ var Challenge: String = "" var PollUrl: String = "" var ResolutionUrl: String = "" var Interval: Int = 0 var PresentationRequest: String? = "" constructor(challenge: String, pollUrl: String, resolutionUrl: String,...

Android Databinding error in compilation with nullable parcelable argument I want to pass a Parcelable class Payment, that I created, from one fragment to another with safe args, but it can be null. I created the argument of type com.example.Payment and make it nullable. When I compile the app I get an error saying Expression in a class literal has a nullable type 'Payment?', use !! to make the type non-nullable in FragmentDirection, under the build folder. The error happended in this line : @Suppress("CAST_NEVER_SUCCEEDS") class FragmentDirections private...

Android Kotlin, catch Google maps current navigation point Is there any way, like any i Mean root or something, to catch in my app or service, current step in navigation from Google maps? I've tried to catch Google maps notification, but unfortunately not all needed informations are there. Is there any easy or not easy way to get this information from Google maps app?

AppBarLayout under a toolbar is it possible to put my AppBarLayout below my toolBar, because in the result the images in my viewPager2 are cropped on the top. hello, is it possible to put my AppBarLayout below my toolBar, because in the result the images in my viewPager2 are cropped on the top. I tried to add a relative layout first but it reduces the size of the images in the viewpager.in advance thank you for your advice <a...

Conditional nullable return type in kotlin I wrote some code and that work! public fun toTimeStamp(epoch: Long?): String? = when (epoch) { null -> null else -> toTimeStamp(epoch) } public fun toTimeStamp(epoch: Long): String = TIMESTAMP_PATTERN.print(toGregorianDateTime(epoch)) but when i converted it to extention function dosent work. compiler say method name is duplicated. I need somthing like this : fun Long?.toDate() : String? { // some code } fun Long.toDate() : String { // some code } or...

NavHostFragment crashes in onDestroyView I have a single Activity app with a FragmentContainerView and a BottomNavigationView setup: When the user enters the app I need to show a splash page(and onboarding if requires) and then navigate it to the home page. so I have created 4 nav-graphs, 1 for the splash, and 3 for the bottom nav. I'm using <a...

Finish secondary intent, first onActivityResult not firing I have an intermediary Activity where the user may be redirected to an additional registration activity. When I call finish() in the second/inner/registration activity, nothing happens. What is the right way to do this? (Below code is stripped down for readability.) Here is my first/outer/main Activity class: private val showRegistrationFormCode = 5 fun onClickRegister(view: View){ val extras = intent.extras if (extras != null) { val intent2 = Intent(this,...

Firestore won't add data I'm trying to add data to Firestore base but it doesn't work and I can't figure out why. ArtDetails class: data class ArtDetails ( val title:String = "", val url:String = "", val description: String = "", val webUrl:String = "" ) I created instance of base: var firestoreDb = FirebaseFirestore.getInstance() Data I want to store when I click on button: val firestoreFavourites = ArtDetails( title = selectedArt.title, url = selectedArt.url, description =...

Interval Operator in RxJava : Which part of code runs in background thread since I have subscribed on IO thread What I am doing: I am using the Iterval Operator from RxJava Output I have posted below What I am trying to find out: As you can see I have subscribed on IO thread. which part of code runs in background Code: class IntervalOperatorFragment : Fragment() { private val TAG = IntervalOperatorFragment::class.java.simpleName private var _binding: FragmentOperatorIntervalBinding? = null private val binding get() = _binding!! private val INTERVAL_PERIOD = 1L private val...

java.lang.IllegalStateException: Could not find method @{() -&gt; myViewModel.clickContinue()(View) in a parent or ancestor Context I have an android application and I making use of an activity with ViewPager2 which is loaded with a number of pages. I have a viewModel class which has a general function to check which page I am on and then handle to click event on a button accordingly, but when I data bind the function to the button, I get the following error: java.lang.IllegalStateException: Could not find method @{() -> myViewModel.clickContinue()(View) in a parent or ancestor Context for android:onClick attribute...

MediaScannerConnection.scanFile() returning null uri I'm trying to save a file as PNG of a canvas where the user can draw something and then call an Intent.ACTION_SEND so that the user can share it's drawing with other apps. The code is able to save the file without any problems, but when I try to use the MediaScannerConnection.scanFile(), the Uri returned by the function is null. I'm using the absolute path of the file created, so I can't understand why this is happening. My class, called BitmapAsyncTask inherits from AsyncTask (yes, I know...

MPChart won't display hourly weather data I'm creating a Weather app and i'm trying to display an MPChart which will use the hourly temps as Y points & the Hour (in "HH" format) as the XAxisLabels/ X points. I'm creating the LineData for the chart in my Fragment's viewModel and expose it to the Fragment via liveData. I also create the XAxisLabels for the chart on my Fragment. The LineData seem to contain the right entries (viewModel: [Entry, x: 0.0 y: 39.07, Entry, x: 1.0 y: 38.68, Entry, x: 2.0 y: 38.16, Entry, x: 3.0 y: 37.29,...

Android webview chromium exception - ContextResult::kFatalFailure: too few uniforms or varyings supported Hello i got this error on console only emulator, maybe sometimes real device E/chromium: [ERROR:context_group.cc(455)] ContextResult:kFatalFailure too few uniforms or varyings supported. when i try to use webview first its not get this crash but back page back page and then go to the page which contains webview i get this error looks like only got this error on emulator but maybe it can be real device. webView.loadurl method crash i try only load <a href="http://www.google.com/"...

How to add a header to a request from volley library I am developing an android app with kotlin and in this road i want to use a request to respond from restfull server ... Now look at my codes that i request it from server and its true but i don't know how to add the parameters of header to my request fun sendCode(){ val URL = "https://RestfulSms.com/api/MessageSend" val body : JSONObject = JSONObject() val header : JSONObject = JSONObject() body.put("Messages",messageText ) body.put("MobileNumbers",PhoneNumber )...

Is there any way that onItemTouchHelper is enabled or swapping system in item list only when long press in this item ?? android java kotlin "Please help me ! I am making android application and I want to enable swapping to item list only when long press is given to item list"

java.lang.ClassCastException androidx.viewpager.widget.Viewpager cannot be cast to CustomPager I wanted to use a viewpager that dynamically adjusts the height, so I created a custompager and tried to build it, but I got the following error. Error caused by at.ViewPagerAdapter.setPrimaryItem(ViewPagerAdapter.kt:34) at.CustomPager.onMeasure(CustomPager.kt:22) Anyone can help? Below is my code where the error occurred. class CustomPager : ViewPager { private var mCurrentView: View? = null constructor(context: Context?) : super(context!!) {} constructor(context: Context?,...

How to put the taken photos in RecyclerView in Kotlin My application uses the camera to take pictures and then saves them in the MediaStore. I would like to put these pictures in my RecyclerView using Glide but I don't know how to do it. A function that saves the image: private fun imageCapture() { // Set desired name and type of captured image val contentValues = ContentValues().apply { put(MediaStore.MediaColumns.DISPLAY_NAME, "${what_is_that_insect_tv.text}")...

Does Android In App Billing API come with KAPT (Annotations) support? I have checked https://github.com/android/play-billing-samples It doesn't have kapt With the powerful annotations feature extended by Kotlin in Android, I felt each application's individual billing flow & the present listener/callback functions in billing API are a perfect requirement to be covered by using KAPT. This...

androidx.navigation multiple destinations for menu item I have a single activity app using the androidx navigation library. For one of the menu destinations I effectively have a fragment as destination with no view whatsoever that depending on the state of the user provided configuration either redirects to the real destination that should be there or to one of currently two different views that tell the user that either he needs to setup a configuration first or that there currently is no active configuration (deleted?) and he needs to select one...

Flutter: non-static method registerWith(Registrar) cannot be referenced from a static context Im working on a flutter plugin that handles the generation of a service. However recently i found an issue with the GeneratedPluginRegistrant that Flutter-Framework uses. When i execute this command: flutter run The result is a Build Failured with the following message. GeneratedPluginRegistrant.java14 error: non-static method registerWith(Registrar) cannot be referenced from a static context...

Range of types for Kotlin generics Is it possible to specify a range of types for generics? Something like class Abc

Passing data to Flutter based on Android event Really struggling with the correct way to achieve the following. If I want to make a native call to Android FROM my Flutter app, there are plenty of examples that I can follow. eg: create an EventChannel and then listen for events and respond to requests from within my Android/Kotlin onMessage listener. However, what I cannot figure out is how to go the other way! I have a native event that is triggering in the background within native Android. When the event occurs, everything works fine and...

Kotlin: Set variable in secondary activity conditional on OnClick in main activity I have a main activity with four card views. I want each card view, when clicked, to go to a multiple choice quiz specific to that card. In my questions activity, I need to identify which of the card views was clicked in order to determine which set of questions should be called. I tried using boolean values in my main activity but am not able to reference them in my questions activity. Main Activity import android.content.Intent import androidx.appcompat.app.AppCompatActivity import...

Exoplayer gives errorcode 401 I am using exoplayer 2.7.3 and when i am trying to play some url i get below error: E/ExoPlayerImplInternal: Source error. com.google.android.exoplayer2.upstream.HttpDataSource$InvalidResponseCodeException: Response code: 401 I can able to play same url in some other place in app. But at this place this issue happens. Can anyone help me what might be wrong?

Send push notification with ktor I made a backend with Ktor framework for a android app and my question is: How to send push notification from server to phone? What tools could I use for this? I would like to send notifications that everyone will receive and that just given users will receive. I am not familiar with Ktor, but my goal with this project is to learn.

AwareLog: AtomicFileUtils: readFileLines file not exist. How can I fix? // My emu crash 2020-09-13 231227.789 22479-22509/com.example.xyz E/AwareLog: AtomicFileUtils: readFileLines file not exist: android.util.AtomicFile@d48dbb7 2020-09-13 231227.789 22479-22509/com.example.xyz E/AwareLog: AtomicFileUtils: readFileLines file not exist: android.util.AtomicFile@1817f24 2020-09-13 231227.882 22479-22500/com.example.xyz E/MemoryLeakMonitorManager: MemoryLeakMonitor.jar is not exist! <a href="https://i.stack.imgur.com/AWjga.png" rel="nofollow noreferrer">enter image description...

Kotlin-How can i put comma every three number like this 1,000,000,000 i have an issue and will be appreciated if u help me . this is an example of my issue : I have some variables like (10.000 , 20,000) that user can select them and increase there credit . when user click and chose one of them it goes to bank gateway and after payment it goes back to my app . I used a text view to get the amount . it's no problem with this . the amount that stored and show to user is 10000 or 20000 or 100000 and i want to be like this 10,000 or 20,000 or 100,000 actually every...

Kotlin: MVVM Firebase Authentication - Creating the User Model Layer It would appear that the Firebase authentication API talks directly to the Activities, as seen in https://firebase.google.com/docs/auth/android/manage-users Based on the architecture that my team has defined for our project: model cloud (CloudInterface for communicating with Firebase APIs) data (Model classes and ADTs for storing user, workout, exercise information) processing (processes data...

Android: ViewCompat.setOnApplyWindowsInsetsListener gets never called I am trying to hide one specific button at the bottom of my layout when the keyboard is opened, in order to make more view available for the user. I am using a base class EmailFragment where I set the function in order to achieve the above written functionality. My problem is that my hideButton function gets never called.. My min API is 21, in my AndroidManifest.XML I have android:windowSoftInputMode = adjustResize Code abstract class EmailFragment( layout: Int, // ... some other...