Implement Java method that returns Collection in Kotlin I'm using Kotlin with Spring Security. When implementing this method: public interface UserDetails extends Serializable { Collection

Waiting for all Flows in a loop finished I have an API that return data as flows: suspend fun loadData(...): Flow suspend fun loadDetails(...): Flow When I get data I need to load details for few items and convert result to live data: job = SupervisorJob() val context = CoroutineScope(job + Dispatchers.Main.immediate).coroutineContext liveData(context = context) { emitSource( api.loadData(...) .flatMapConcat { items -> items.forEach { item -> if (item is Details){...

Mappings and usage of Kotlin data types and Swift data types Let's say I have a function foo which takes two arguments: actual fun foo(list1: List, list2: List) { ... } According to the https://kotlinlang.org/docs/tutorials/native/apple-framework.html Kotlin's Long type is mapped to KotlinLong and Kotlin's Double is mapped to KotlinDouble. Now I would like to call this function from my iOS App. Let's say I have two arrays: let list1Numbers =...

How to populate a new list inside reduce function - Kotlin Reduce function is first choice to find total of elements in the Array/List I want to create an Array of the totals till that index of array. So for [2,1,2,1,2,1,1] as Input, I am expecting [2, 3, 5, 6, 8, 9, 10] as output I know the Javascript way, but failing to get it in Kotlin JSFiddle here var sumArr = [] var res = intrv.reduce((a,b) => { sumArr.push(a+b); return a+b }) console.log(sumArr) What should be the...

requestFocus() work for physical keyboard but dont work for softwere keyboard I set on change listener for my input edit text and with an if say change focus its work for the physical keyboard but don't work for emulator keyboard I don't know why this is my code binding.smsInput1.addTextChangedListener { if (it.toString().trim().length == 1) { SMS = binding.smsInput1.text.toString() binding.smsInput2.requestFocus() } }

What can be the causes of this logcat? What do I check for? Recently Android 9 and 10 devices have reported this crash in the Google play reports. I am not able to understand what can be the cause of this crash, I have tried several devices, Samsung remote test labs, but I could not reproduce this crash and nearly all models I tried worked fine. However, the crash reports have increased reaching thousands now. And the crash only happens on Android 9,10 devices. Can someone please guide me on what to look for, or the possible issues that could be the...

android bottom sheet fragment will flash when activity finish I use bottom sheet fragment and put a button in fragment to start activity2. But when I finish the activity2, bottom sheet fragment will flash and show from bottom. It seems that bottom sheet will dismiss when startActivity and show again when activity finish. Here is the screen shot Is there any idea to make it not happen activity1.xml activity1.class class BottomSheetActivity: AppCompatActivity() {...

Kotlin implementing custom mongoDbRepository im trying to create custom mongo repository according to this https://docs.spring.io/spring-data/mongodb/docs/current/reference/html/index.html#repositories.custom-implementations to later inherit from. but i cant figure out how to deal with kotlin generic. i cant use inline+reified since im overriding interface method @Component...

IllegalStateException: TabLayoutMediator attached before ViewPager2 has an adapter fragment_news_details NewsDetailsFragment class NewsDetailsFragment : Fragment() { lateinit var binding: NewsDetailsBinding override fun onCreateView( inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle? ): View? { binding = inflater.bind(R.layout.fragment_news_details, container) return binding.root } override fun...

Unable to use listOf(), hashMapOf(), mutableListOf() and other function in Kotlin I am getting below error when I am trying to use listOf(), hashMapOf(), mutableListOf() and other function in Kotlin. Sentence: var moreBooks = hashMapOf("Wilhem Tell" to "Schiller") Error: Unresolved reference: hashMapOf I have tired Invalidate Cache/Restart, still not working. Earlier this used to work. Please help

Unexpected logcat errors when running android camerax without an ImageCapture use case Finished going through the codelabs tutorial and everything is working just fine, but after removing the ImageCapture use case, I get a reoccurring error in the logcat every 50 ms or so. Here are three lines of said error: 07-28 182216.225 211-29468/? E/mm-camera: module_faceproc_port_event_func:886] MCT_EVENT_MODULE_BUF_DIVERT 65539, Cannot start FD, active 10002, frameid 432...

Firebase verifyPhoneNumber from a repository class I am producing an Android Application and wish to log in users by phone verification with Firebase. I was following the Firebase documentation and came across the verifyPhoneNumber method: PhoneAuthProvider.getInstance().verifyPhoneNumber( phoneNumber, // Phone number to verify 60, // Timeout duration TimeUnit.SECONDS, // Unit of timeout this, // Activity (for callback binding) callbacks) // OnVerificationStateChangedCallback I am...

Calender is not getting displayed when click on ediitext I refered this answer, but onclick on edittext calender is not displaying... When click on eddittext it is working like a normal one like keyboard is displaying. Can you explain where I'm wrong? Here is my code: val myCalendar: Calendar = Calendar.getInstance() val edittext1 = findViewById(R.id.dob) as EditText val date = OnDateSetListener { view, year, monthOfYear, dayOfMonth -> // TODO...

Hibernate Concurrent ManyToMany relationship I am having troubles when running last test against a Kotin Spring Boot application. One critical object has a ManyToMany relationship to another one: @Entity data class Subscriber( @ManyToMany @JoinTable(name = "subscriber_message", joinColumns = [JoinColumn(name = "subscriber_id")], inverseJoinColumns = [JoinColumn(name = "message_id")], indexes =[ Index(name = "idx_subscriber_message_message_id", columnList = "message_id"),...

How to replace getExternalStorageDirectory() by getExternalFilesDir in kotlin I am practicing with MediaRecorder and when I use getExternalStorageDirectory () I see this warning 'getExternalStorageDirectory (): File!' is deprecated. I have investigates and suggest me to use getExternalFilesDir, the problem is that I don't know how. My code val path: String =Environment.getExternalStorageDirectory().toString() + "/grabacion.mp3"

Android report that language data is available when there is no data and internet connection I have a situation there... I try to check is some language (f.e. Russain) is available for TTS engine (Google) on android. Here the code in Kotlin: val localeRU = Locale("ru") var isAvailable = ttsWorks.tts.setLanguage(localeRU) var text = when (isAvailable) { TextToSpeech.LANG_AVAILABLE -> "LANG_AVAILABLE" TextToSpeech.LANG_COUNTRY_AVAILABLE -> "LANG_COUNTRY_AVAILABLE"...

When I am entering the stoppages then map is loading too slow.How to make it fast Whenever I am adding latitude longtude on map to draw route.source and destination with two waypoints but it take almost 6 second which is quiet slow Example location Amritsar -source Delhi -waypoints one Chennai -waypoints two Jalandhar -destination

IntelliJ IDEA ( Kotlin not configured ) IN Edutools Plugins So I Install the program in IntelliJ IDEA Edutools Plugins Name Is Memulai Pemrograman Dengan Kotlin, And when I install that program on my IntelliJ IDEA, I get an error, this is my error screenshot : I use Java version OpenJDK 13.0.2 2020-01-14 OpenJDK Runtime Environment (build 13.0.2+8) OpenJDK 64-Bit Server VM (build 13.0.2+8, mixed mode, sharing) I use the Gradle version...

Why is my CameraX CameraView showing a blackscreen? I have been implementing CameraView for my app and it used to work few weeks ago, but now it is just showing a black screen, meaning the preview is not shown. As a result, it seems like the videos being recorded aren't being saved either. Can someone correct my code please? Manifest: build.gradle(app) def camerax_version = "1.0.0-beta07" implementation "androidx.cameracamera core$camerax_version" implementation "androidx.cameracamera camera2$camerax_version"...

After adding Kapt plugin - A failure occurred while executing org.jetbrains.kotlin.gradle.internal.KaptExecution First of all, I'm pretty much aware that a lot of questions on this error had been posted already here, and none of them seems to be having a proper solution especially the one I need. I'm stuck with the following error for over a week. I'm working on an android project which is being built using Kotlin, MVVM, Clean Arch, and Navigation Components. I recently added realm database, and for that I had to add the following plugins. apply plugin: 'kotlin-kapt' apply plugin: 'realm-android' The...

kotlin.KotlinNullPointerException at com.example.myapplication.ui.home.HomeFragment I'm trying to manipulate elements from xml of a fragment, but all tries I did, result in some error. When I use root!!.qr_code.visibility = View.INVISIBLE, I got this: What is wrong with my elements reference? FATAL EXCEPTION: main Process: com.example.test, PID: 26445 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.test/com.example.myapplication.MainActivity}: kotlin.KotlinNullPointerException at...

No primary or default constructor found for interface org.springframework.web.reactive.function.server.ServerRequest I am trying to implement WEBFLUX with kotlin. But with a simple GET API, I am getting the below exceptions - java.lang.IllegalStateException: No primary or default constructor found for interface org.springframework.web.reactive.function.server.ServerRequest at org.springframework.web.reactive.result.method.annotation.ModelAttributeMethodArgumentResolver.createAttribute(ModelAttributeMethodArgumentResolver.java:220) ~[spring-webflux-5.2.7.RELEASE.jar:5.2.7.RELEASE] Exception while invoking...

getUid can only be called from within the same library group (groupId=com.google.firebase) I'm trying to save a user in the repository with a method, when I set the document id as the current user id logged in it gives me this error user.getUid can only be called from within the same library group (groupId=com.google.firebase) class FirebaseRepository { var db = FirebaseFirestore.getInstance() var auth = FirebaseAuth.getInstance() var user = auth.currentUser fun saveUser(user: User): Task{ var documentReference =...

Kotlin data class overhead According to the official doc, a Kotlin data class has the following generated functionalities: equals()/hashCode() pair toString() componentN() functions corresponding to the properties in their order of declaration copy() Now I understand that these functions are useful sometimes, I feel that in a lot of cases they are not necessary becase regular Kotlin classes already have auto-generated setters and getters. For example, in a Spring controller, if I want to create a DTO class to store and...

How to get data from Contract State form of a state, without casting? Is there a way to retrieve data from ContractState form of a state data, without casting ? I was trying like this given below using reflections, but it doesnt gave values (I guess it is returning state field "status" 's metadata). historyForId is of type : ArrayList val temp2 = historyForId.first().get("contractStateData")!!.javaClass.getDeclaredField("status")

How to execute button.setOnTouchListener when some conditions are met (Kotlin) I made button and give it touchlistener. When I hold it, function named "fun" is executed repeatedly with milliseconds. But I want to add a condition in addition to holding button. (Just like "a == true") when I write the code such as if ( a == true ) { button.setOnTouchListener(RepeatListener(initialInterval, normalInterval, View.OnClickListener { fun() })) and here is RepeatListener I found at this site. import android.os.Handler import android.view.MotionEvent import...

How to hide automatically created room app in android I m using room in android. Now it creates an another database app automatically. How to hide that app. so now i have 2 apps , one main app and another database app. Hiding or locking that app whatever u know plz tell

SQLDelight Schema Generation Failing I'm using SQLDelight on Android and started reading about SQLDelight's Gradle DSL so that I could generate a database schema and prepare for a small migration. I've been working with pretty much all default configuration, so I added this very minimal sqldelight block to my build.gradle: sqldelight { Database { schemaOutputDirectory = file("src/main/sqldelight") } } After I added...

Adding Markers to Google Maps from Firebase with Kotlin I am new to android/kotlin and am trying to make the android version of my ios app. I have followed the Maps Activity tutorials and have a functional map with the ability to add a marker to it straight from code (lat/lng & title in the code). Where I am running into trouble is adding a set of markers from my database (firebase realtime database). I have it set up for the android version and firebase recognizes that it is connecting, but I am lost on how to actually bring the values in. The...

Android WebRtc terminated What is the place where I can understand that the WebRtc peerconnection is terminated/closed? Or that its disconnected? There is the PeerConnection.IceConnectionState but close event is coming only if I close it.