Why Retrofit doesn't send POST request to the server? In API declaration I have this code: @FormUrlEncoded @POST("loginByPass/") fun loginByPassword(@Field("login") login: String, @Field("password") password: String, @Field("phone") phone: String) : Observable Retrofit object I create this way: class API { companion object { fun getRetrofitAPI() : IAPI { val interceptor = HttpLoggingInterceptor() interceptor.setLevel(HttpLoggingInterceptor.Level.BODY)...

Simple clone of gradle test task not recognized as test in IntelliJ I want to have a very simple clone of a gradle task like this: project.tasks.register("runTests") { it.group = "otherGroup" it.dependsOn("jvmTest") } The problem is, that the source task (jvmTest) is a test task. And when I do the simple dependsOn like in my example, intellij does not recognize it as a test task (e.g. it only displays the output in the build terminal but does not show the fancy green, yellow and red test symbols) I tried to add it as follows...

Kotlin: how to use reduce/fold with a data structure as the accumulative argument? I want to use reduce/fold methods to create a new list from an existing List. This is the code I tried to write: val list: List = listOf(1, 2, 3) val newList = mutableListOf() val sum: List = list.fold(newList) { (acc: List, i: Int) -> { acc.add(i + 10) acc }} It doesn't compile. I want that newList will be (11,12,13). How can I do it in a functional manner? In Javascript, for example, this code compiles: list.reduce((acc, item) => { acc.push(item + 10)...

Is possible to recover whole app when it is killed(by user or by android), or at least get last activity? Assuming that the user closes the application through "recent applications" or that Android for whatever reason closes the application, I then want to recover the last activity that the user was in, is there any way to do this, by Android standards, or do I need to create sophisticated schemes? Ex: Activity A -> B -> C then user swipe to close app / android close it on reopen, should go to Activity C Thanks in advance for any help.

JavaFX BufferOverflowException on embedded device We're using a iMX6 SoM chip and a 480x272 LVDS display for our application. We're also using Gluon's OpenJFX and an embedded build of Java 8u241. Whenever we launch the jar file, we get spammed with the following errors java.nio.BufferOverflowException at java.nio.DirectIntBufferU.put(DirectIntBufferU.java:363) at com.sun.javafx.tk.quantum.UploadingPainter.run(UploadingPainter.java:153) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at...

Adding gif into Jetpack Compose Quick question really. I have a gif that I would like to place into my app. I know how to insert image resources, but when I try adding the gif it becomes a static image. DrawImage(image = +imageResource(R.drawable.gif)) Has anyone tried adding a gif into Jetpack Compose, as struggling to find docs online as to how?

How to pass an object's lambda variable throught an intent? I'm new to kotlin and Android, and i was looking into recyclerView but ran into a few hiccups. Basically i have, + 2 Activities, MainActivity containig a recyclerView and fullDetails activity that opens with onClick on each ticket of the recyclerView, +An ArrayList of objects,tempMenuList of options class, +The class contains a few strings an a lambda variable actionOfItem as i want to have individual functions for each object, +I'm trying to pass the lambda through an intent as serializable...

Android kotlin - return int for "parent" function This is the code private fun like(id: Int): Int{ val params = RequestParams() params.put("id", id) val client = AsyncHttpClient() client.post("https://www.ttt.com/ttt.php", params, object : JsonHttpResponseHandler() { override fun onSuccess(statusCode: Int, headers: Array?, response: JSONArray?) { return 1 } override fun onFailure(statusCode: Int, headers: Array?, e: Throwable, response: JSONArray?) {...

How do I pass a filename parameter to MediaPlayer in android kotlin? How do I pass a filename parameter to MediaPlayer in android kotlin? I have a sound file called "hello.wav" which is in the res/raw directory. I have tried the following code and it will not accept the parameter sndfil as there is no file called sndfil.wav in the res/raw directory... private var sndfil = "xxxxxxxxxx" fun playnow (sndfil: String) { mp = MediaPlayer.create(this, R.raw.sndfil) mp.start() return } playnow("hello") How can a filename...

Kotlin - Array of object (no null) I'm coding in kotlin, and i have a problem with the Arrays I would make a function that return an Array of Car (for example), but that array is build by data from file Exemple : fun buildAllCar(data:string) : Array { val array = arrayOfNulls(5) //In the real code, the size is retrieved by an other item for(i in array.indices){ array[i] = buildACarByData(data); //Just so you could see a sample usage } return array.requireNoNulls() } Without the requireNoNulls() ,...

Gradle : How to translate some groovy code to kotlin The groovy code below is working fine in a script build.gradle : task sourcesJar(type: Jar, dependsOn: classes) { from sourceSets.main.allSource classifier = 'sources' } artifacts { archives sourcesJar } I can't succeed in translating its syntax to kotlin build.gradle.kts. Could someone give me the correct translation ?

Are type arguments in interfaces an actual type? Don't think the title is best wording for this question, I have an interface with two type arguments, and I seem to be able to cast this as both of the types at the same time, see reproducable example: interface BaseResult { @Suppress("UNCHECKED_CAST") fun isSuccess(): Boolean { return try { val a = this as S //ClassCastException expected val b = this as E println(a) //com.BaseResultTest$ExampleResult$Error@17d10166 println(b)...

How do I handle an error in a Retrofit+RxJava request I use MVVM. I have a function that gets data from the server in JSON format. This feature is in my Repository how can I show the user an error if there is no Internet on the device and ask the user to turn on the Internet? val disposable = CompositeDisposable() disposable.add(apiRepository.getAllContacts() .subscribeOn(Schedulers.io()) .subscribe( {response -> contactDao.insertAll(response)}, { error -> error.printStackTrace() }))

Cannot Create Instance Of Class ViewModel I'm currently working on a countdown app, and whenever I open it, it fails with a message saying Cannot create instance of class com.nailuj29gaming.CountdownViewModel The stack trace is Process: com.nailuj29gaming.countdown.debug, PID: 17800 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.nailuj29gaming.countdown.debug/com.nailuj29gaming.countdown.MainActivity}: java.lang.RuntimeException: Cannot create an instance of class...

Android: End whatsapp call programatically with simulating keyevents [NON ROOT] I need clues to end whatsapp call programatically. it's for an app to call on whatsapp programatically with timers, so when the timer goes out, the call end itself for now the best i can find is with instrumentation framework, which need root/system apps signing. here's the code to start the call. it's done through contactId and intent to contacts contactId = getContactIdFromNumber(...

What is Kotlin for C++ push_back() and pop_back() on a string? In C++ creating and manipulating a stack of characters is rather simple: #include int main(){ std::string path {}; path.push_back('L'); path.push_back('R'); path.pop_back(); std::cout

How to upload an image to firebase storage from external storage after image capture? I've made a method which opens the camera, the user takes a picture and I receive a Uri. I want to upload the photo on firebase storage but it seems not being able to access the picture while my preview does. I've got this error when I try to upload on firebase using the Uri I received back : /content/media/external/images/media/64 open failed: ENOENT (No such file or directory) But my image is displayed in my ImageView (its a preview) and in my gallery app. My code looks like this :...

What does a sealed class do and explanation of the class below I have been doing android development for a while but I always looking forward to learning new things. I came across the code below on codelab for viewmodel unit testing. I really like the code base is arranged but do not understand some codes like the one below. I will like some guidance on creating a class that has a type of map as below. Basically I will like to know how Result still relate to Result and why the class is just called/implemented as Success(it). I will appreciate a kind...

How to encrypt a string with a public ecdsa key in Android using bouncycastle? I have a public/private key set created with sjcl.js in node.js. I need to encrypt a string in Android / Kotlin. import org.bouncycastle.crypto.ec.ECElGamalEncryptor import org.bouncycastle.crypto.ec.ECEncryptor import org.bouncycastle.crypto.engines.AESEngine import org.bouncycastle.crypto.modes.CBCBlockCipher import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher import org.bouncycastle.crypto.params.KeyParameter import org.bouncycastle.jcajce.provider.asymmetric.ec.IESCipher...

How to make the browser recognise a breakpoint set in some external Kotlin library in Kotlin/Js? Currently, I'm using this Kotlin/Js version: id("org.jetbrains.kotlin.js") version "1.3.70-eap-184" I have configured source map generation: target { browser { compilations.all { kotlinOptions { friendModulesDisabled = false metaInfo = true sourceMap = true sourceMapEmbedSources = "always" moduleKind = "commonjs" main = "call" } } } } Then, I...

Showing error to run Gradle in android studio.Selected java to create new project but shows Kotlin gradile I have uninstalled Android studio a few days ago and installed it now. when I created a new project it shows SDK is already up to date as in . when the project is created it shows the error to sync unable to Download https://services.gradle.org/distributions/gradle-5.4.1-all.zip and when I click on new it shows as...

java.lang.UnsupportedOperationException: Reflective setAccessible(true) disabled When I run my Ktor application with gradle run then I've got the following exception: 192111.795 [main] DEBUG io.netty.util.internal.logging.InternalLoggerFactory - Using SLF4J as the default logging framework 192111.810 [main] DEBUG io.netty.util.internal.PlatformDependent0 - -Dio.netty.noUnsafe: false 192111.810 [main] DEBUG io.netty.util.internal.PlatformDependent0 - Java version: 11 192111.811 [main] DEBUG io.netty.util.internal.PlatformDependent0 - sun.misc.Unsafe.theUnsafe:...

why dont set this value? i want set my gorterilecekkart value in code but it not set, it always see first value how i solved this problem? please help me? i dont know english enaugh sory. but my code i write comment class Sahnem : AppCompatActivity() { var gorterilecekkart=5 override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_sahnem) val parsUser = ParseUser.getCurrentUser().email...

How to clear phone cache? I was working on an android cache cleaning app, but I can't find anything on internet. Do any body knows how can I clear or delete cache files of all apps like any cache cleaning apps would do? Thanks

non reified generic return type: how to implement Kotlin's CoroutineContext.get I was checking out the classes and methods used in kotlin's coroutine mechanism. I stumbled accross the CoroutineContext class and especially it's get-method. CoroutineContext is an interface and get is defined as: abstract operator fun...

Android Studio with Kotlin gives "Unresolved reference" to plus sign in two lines but not in one In Android Studio, programming in Kotlin, if you write: val t = listOf("A","B") + listOf("C","D") everything is fine and dandy. However, if you write: val t = listOf("A","B") + listOf("C","D") the IDE will report a "Unresolved reference" in the plus sign. The compiler also won't compile. Why is the line break meaningful in this case? Am I missing something?

Kotlin code strikethrough line not showing on reopened app I’m looking for assistance in showing the strike thru line when the app is re-opened. I have a checkbox and when you put a check in it then the text also shows the strikethrough line. When you uncheck then the strikethrough line is gone. The issue is if you have the item checked with the strikethrough line and then close the app and reopen the checkbox is still checked but the strikethrough line is no longer showing. What is needed in order for it to stay? See below code. if...

variables don't update after inheriting from subclass Lets say I'm working on the following code in Kotlin: class Human(var head: Head, var body: Body, var legs: Legs) { var height = this.head.length + this.body.length + this.legs.length } class Head(var length: Int) { } class Body(var length: Int) { } class Legs(var length: Int) { } Why is the correct height Human.height -> x returned on initialization but does not update if changes are made to the individual parts? Is my formatting for using these subclasses even correct? I have found...

Android YUV_420_888 to RGBA with ScriptIntrinsicYuvToRGB NV21 and nio buffers in JNI I work with YUV_420_888 image format (from camera) and I would like to convert it to RGBA on Android. I know there are many available soulutions but I would like to use the built-in ScriptIntrinsicYuvToRGB and do the buffer copy in JNI/NDK. I know in this format Y,U,V planes are available and it is guaranteed that U and V planes will have the same pixelstride/rowstride and length and on some devices U and V might be overlapped. For simplicity let's see the case when Y's pixelstride=1,...

Android notifications grouping not working I'm trying to setup notifications. private fun sendNotification(id: Int, name: String) { val channelId = getString(R.string.default_notification_channel_id) val defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION) val notification = NotificationCompat.Builder(this, channelId) .setSmallIcon(R.drawable.ic_notification) .setContentTitle(getString(R.string.msg_new_ticket)) .setContentText(name) .setGroup(GROUP_KEY)...