java/kotlin Normalizer fails to normalize some accented letters I noticed that the Normalizer leaves some non-ascii letters alone, such as the first letter in the name of the Polish city Łódź. Here are some more: import java.text.Normalizer fun main() { for (i in 0xC0..0x170) { val ch = Char(i) if (!ch.isLetter()) continue val norm = Normalizer.normalize(ch.toString(), Normalizer.Form.NFD) if (norm.length >= 2) { // println("'$ch' => '${norm[0]}' ${norm[0].code} '${norm[1]}' ${norm[1].code}") }...

Android Kotlin - Saving Preferences (key value pair) - not working for me I am trying various simple Android Kotlin examples, to save some persistent data in my app. To start, I am using a straight forward example of writing one key-value pair, and reading it back. here's my code, in my activity's OnCreate() val sharedPrefFile = "MyPrefFile" val sharedPreferences: SharedPreferences = this.getSharedPreferences(sharedPrefFile, Context.MODE_PRIVATE) fun setPref() { val editor = sharedPreferences.edit() val myName = "Elvis"...

Android Studio Database inspector icon does not be shown im learning using room database in kotlin but i cannot see database inspector icon in android studio. has anyone any solution ?

How to export canvas to Png image and save it to gallery in jetpack compose? I created an application for image editing. I create some effected-on images from the gallery but can't save them after editing them. This is an example of a canvas that I want to save as png. var resizedBitmap: Bitmap? = null Canvas(modifier = Modifier.fillMaxSize(0.75f)) { val canvasWidth = size.width val canvasHeight = size.height with(painter) { draw(painter.intrinsicSize) } drawRect(black, size = size.copy(width = size.width /...

Kotlin Android - adding values to data class error, Why would it cause my app to crash I am trying to have a grid layout in a recyclerview to show and image text and a double variable. The goal is to add a search bar that will display the results to the recycleView. I am new to kotlin so forgive me if the problem is obvious. I am not sure exactly what is causing my app to crash, but I narrowed it down to 1 line of code in my MainActivity.kt dataList.add(mealData("mealTitle.toString()", Restaurant.toString(),R.drawable.food1,"mealCat.toString()",...

Converting Kotlin to swift get out of index error I a. trying to convert my Kotlin code to swift but I got an Index out of range error any help is appriatcted. Swift func getMaxBeauty(arr: [Int]) -> Int { // Write your code here let n = arr.count var beauty = 0 var leftMax = Array(arrayLiteral: n) leftMax[0] = arr[0] for i in 0...n { leftMax[i] = max(leftMax[i - 1], arr[i]) } var rightMin = Array(arrayLiteral: n) rightMin[n - 1] = arr[n - 1] for i in (n - 2)..

ProcessBuilder command with single quote fails I have the following code: val process = processBuilder .command(listOf( "curl", "--location", "--request", "GET", "$url", "--header", "'Authorization: token xyz'" )) Running this will result in the command failing, It's actually not picking up the header properly. I know the curl is good, because printing the command and executing it directly in terminal...

Fill the space at the bottom of screen in AlertDialog I have used a constraint layout and set both height and width to match_parent but still, there's some space I can't seem to get rid of. And also I'm using this layout for an AlertDialog. I tried creating a style for it but that doesn't seem to work either. Does anyone know how to fix this? Layout: AlertDialog: val view = View.inflate(this, R.layout.no_internet_alert, null) val builder = AlertDialog.Builder(this,...

Cannot make chat bubble after second without arrow also the time setting with text Hello i cannot make chat bubble for one message with arrow and after that without arrow until the other will send message like in WhatsApp messages screen also I am not able to do the mechanism for timing and text to be shown in same row while message characters are more it will move to second line as shown in screenshot. Please anyone who have make any chat app share its solution

what's the difference of the kotlin version between gradle setting and IDE? I'm wondering of the difference of the kotlin version between gradle setting and ide. I can see the kotlin version of IDE(Tools -> Kotlin -> Configure Kotlin). And there is another kotlin version defined in build.gradle. I want to know the difference. I think that the version in buidl.gradle affects to real project and some dependencies. And the version in IDE affects when we wrtie the code. Is my guess is right?

mockk calls original class only instead of mockked results I have this class that I need to test. I am thinking it is because I am creating a new instance of the class A: class A { fun getName() = "Name" } class B { private a = A() fun amend(){ return "${a.getName()}-BName" } } Now I want to test class B in BTest.kt @Test fun amendTest(){ val b = B() val cls = mockk<A>() //everytime getName is called return empty string every { cls.getName() } returns "" //call ammend method val...

Kotlin convertion to and from the byte array Recently I'm trying to make a byte array from an object of class containing a few variables of primitive types. The problem has began with saving a double to the 8-byte format. After getting it back retrieved value isn't the same but kind of very close. First I checked such expression val value = Double.fromBits(1.2.toBits()) and it gave me a correct answer. So, I guess there's something wrong with my implementation of moving long integer into byte array but I can't find the bug. Samples...

gRPC response error : Unknown return value type: java.lang.Double while response value is correct I am working on a project based on Microservices architecture also have implemented a gRPC communication between internal services. I have implemented a grpc-interface module which contains my .proto files and I will add it to my microservices as submodule. Here is my build.gradle file for my grpc-interface module: buildscript { ext { protobufVersion = '3.19.1' protobufPluginVersion = '0.8.18' grpcVersion = '1.44.0' protobufJava = '3.19.4' } } plugins...

Android: Unable to go back to previous page in Webview I'm loading a url in WebView which has a flow of 3-4 screens but I'm unable to go back to previous page even if it's available. I'm using below code in the fragment to load url in webview. binding.webView.settings.javaScriptEnabled = true binding.webView.settings.minimumFontSize = resources.getInteger(R.integer.webView_small_font_size) binding.webView.settings.javaScriptCanOpenWindowsAutomatically = true binding.webView.setOnKeyListener(object : View.OnKeyListener {...

How to extract content of Mono and set to a variable in Kotlin? I have a function foo() that return Mono I want to store the String output in a variable e.g. - fun foo(): Mono { return Mono.just("Hello") } fun consumeFoo() : String { val result : String = // Set this variable to "Hello" by calling foo() } In this case how to set result to string inside Mono ? Note - I want to achieve this in a non-blocking way

Smart algorithm to randomize a Double in range but with odds I use the following function to generate a random double in a specific range : nextDouble(1.50, 7.00) However, I've been trying to come up with an algorithm to make the randomization have higher probability to generate a double that is close to the 1.50 than it is to 7.00. Yet I don't even know where it starts. Anything come to mind ? Java is also welcome.

Android Sound Localization Does anyone know how to do sound/media Localization in android like we do with strings translations to support different languages in the app? because i didn't find any good resources for this feature.

How to handle frequently changing row in recycler view in anroid I am working on a tool that list device based on certain value and the signal is on of them defined by RSSI value rssi Here this(RSSI) value changes frequently which keeps updating the rows in the recycler view. I have just started with recycler view and by looking internet I am using a list adapter with diffutil callback. But it behave the same here is example...

Android Kotlin retrigger retrofit api call which return Flow I'm wrapping and callback base api call using callbackFlow i Have my repository function which return Flow repository.kt fun getItem: Flow = callbackFlow { api.send( param, OnLoadDataCompleted { override fun onFinish(resultStr: String) { trySend(it) } } ) } I'm able to collect the above flow in my UI viewmodel.getItem.onEach { updateUI(it) } .flowOn(Dispatchers.IO) .launchIn(viewmodelScope) Question is how can I call...

Background suspend fire and forget channel processing in Kotlin + Spring What is the correct way to rake Channel in the background? Suppose I have long polling bot with onMessage(callbackSuspendAction: suspend.() -> Unit) and this callback is a heavy computation (20-30 seconds) I put these events to the messageHandlersQueue: Channel in the following way: messageHandlersQueue.send( coroutineScope { launch(start = CoroutineStart.LAZY) { val vkClient = VkClient(actor.userActor) processVkUserQuery(msg.chat.id, addressName,...

How to make a button like this? [Kotlin] I want to make a button like this how can I do it? I want to change the color of shadow of the button.

How to learn material 3 component attribute use case Can someone help me on Material 3. I found this two method darkColorScheme and lightColorScheme . When I checked the definition of this function I found so many colors used in the function. I am confused which one using where so, Is there any documentation or blog where this type of attribute is using i.e. secondaryContainer, tertiary etc. this is few example I want to learn each attribute where this is using according to their name. I am new in material design with <a...

Regex ignoring matches between square brackets Hi I'm trying to create a Regex to help separate a string into a series of object fields, however having issues where the individual field values themselves are lists and therefore comma separated internally. string = "field1:1234,field2:[[1, 3],[3,4]], field3:[[1, 3],[3,4]]" I want the regex to identify only the commas before "field2" and "field3", ignoring the ones separating the list values (e.g. 1 and 3, ] and [, 3 and 4. I've tried using non-capturing groups to ignore the character after...

I am getting this error kotlin Android Problem 2022-07-17T12:12:26.242+0200 [ERROR] [org.gradle.internal.buildevents.BuildExceptionReporter] Execution failed for task ':app:kaptDebugKotlin'. A failure occurred while executing org.jetbrains.kotlin.gradle.internal.KaptWithoutKotlincTask$KaptExecutionWorkAction java.lang.reflect.InvocationTargetException (no error message) Try: Run with --scan to get full insights. Exception is: org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:kaptDebugKotlin'. at...

Android Navigation Error: You must call setGraph() before calling getGraph() I'm trying to make an memo app, and this is my first time with application programming. When I tried to run the code on my device it just dies after showing the IntroActivity and the error log says: "You must call setGraph() before calling getGraph()" Below is the code. class ListActivity : AppCompatActivity() { private lateinit var appBarConfiguration: AppBarConfiguration private lateinit var binding: ActivityListBinding override fun onCreate(savedInstanceState: Bundle?) {...

Create over rides nothing package com.example.studentregister import androidx.lifecycle.ViewModel import androidx.lifecycle.ViewModelProvider import com.example.studentregister.db.StudentDao import java.lang.IllegalArgumentException class StudentViewModelFactory( private val dao: StudentDao ):ViewModelProvider.Factory { override fun create(modelClass: Class): T { if(modelClass.isAssignableFrom(StudentViewModel::class.java)){ return StudentViewModel(dao) as T } throw...

Cannot use vibration in a Thread I'm trying to use the vibrator service inside a Thread class but when I do so, I have an error which says "Type mismatch: inferred type is String but Context was expected" here is my code : class myThread: Thread() { override fun run() { var vibration = getSystemService(Context.VIBRATOR_SERVICE) as Vibrator for(i in 1..5) { vibration.vibrate(100) Thread.sleep(1000) } } } It works in my mainActivity class but it doesn't in a Thread....

Platform class kotlin.Unit requires explicit JsonAdapter to be registered In a retrofit interface I have defined a method return type as ApiModel . but when I call the method I get the error below. Platform class kotlin.Unit requires explicit JsonAdapter to be registered so I tried to create my own JsonAdapter as below. class UnitJsonAdapter { @ToJson fun toJson(writer: JsonWriter) { writer.nullValue() } @FromJson fun fromJson(reader: JsonReader): Unit { reader.close() return Unit } } but I face this error....

Trying to display buffer from node backend to ImageView Kotlin I'm having issues trying to display buffer images to Kotlin, I don't know if I'm doing it wrong, I've tried everything, The return of the backend looks like this. I use node backend and mongo db database. Here is the output from backend I'm trying to display:...