passing data from fragment to activity is not same I have fragment in activity. and I want to send data from fragment to activity. how I get data in Fragment and send to my Activity: val edit = question!!.id (activity as QuestionActivity).kirimItem(edit) in activity : fun kirimItem(item: String) { idItem = item } and I call idItem in the button next onClick and show Toast the value from idItem in the fragment, when I test data, question!!.id = 8 but toast...

json response as Map I can`t get json response as a Map object. import com.google.gson.* import org.jsoup.* import com.google.gson.JsonPrimitive import com.google.gson.JsonElement // 1 count=10 at response fun getFilms(count: Int = 1): Unit { var n: Int = 0 val builder: GsonBuilder = GsonBuilder() val gson = builder.create() while(n

More than one file was found with OS independent path 'com/google/i18n/phonenumbers/data/PhoneNumberMetadataProto_WF' Can someone please help me? I have been stuck with error for few days I have tried to exclude it using package options but doesn't seem to work. caused by: com.android.builder.merge.DuplicateRelativeFileException: More than one file was found with OS independent path 'com/google/i18n/phonenumbers/data/PhoneNumberMetadataProto_WF' at com.android.builder.merge.StreamMergeAlgorithms.lambda$acceptOnlyOne$2(StreamMergeAlgorithms.java:75) at...

Kotlin `cinterop` tool fails in `NSObjCRuntime.h` I have a kotlin multiplatform project setted up like this: plugins { id 'kotlin-multiplatform' version '1.3.11' id "org.jetbrains.kotlin.platform.native" version "1.3.11" } repositories { google() jcenter() mavenCentral() } kotlin { targets { fromPreset(presets.iosX64, 'ios') { compilations.main { outputKinds('FRAMEWORK') cinterops { firebase { def proj =...

export data from firebase firestore I am doing an secret santa app for my university project and I store users into firebase firestore, then I want to pair them randomly. I think one way to do this is to download this database as json file. Can anyone tell me how to download firestore database as json file, or another way to pair them randomly? Thats how i authenticate and add user into database: registerButton.setOnClickListener { auth.createUserWithEmailAndPassword(emailEditText.text.toString(),...

Koin testing on Androidx with Activity I am trying to do some instrumented tests of a boilerplate code after migrating it to AndroidX. Note that before migration, all of them worked, but after, only unit tests work, the instrumented test crashes on Null Pointer exception, where it shouldnt. Here is the errror: Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'io.reactivex.Flowable io.reactivex.Flowable.subscribeOn(io.reactivex.Scheduler)' on a null object reference 025531...

Ddd images picked from image picker to recycler view, Android Studio, Kotlin I have been programming in Swift for 3 years and I am new to android development, I am trying to pick an image from image picker and put it into a recycler view, I can do this with hard coded images that are in my drawable folder but dont know how to do this with images I pick. When I pick an image it is succesfull and i can show the image filepath I/System.out: Tony image path is /document/raw:/storage/emulated/0/Download/Max.jpg When I try to add it to the array of already hard coded...

Get class of parametrized class in Kotlin I need to send Class as parameter of a function. The problem is that the class which I want to send is a parametrized class: class Animal { ... } Code below produces a compilation error: someFunction(Animal::class.java) Declaration of someFunction in Java: public someFunction(Class someClass) { ... } Am I able to send parametrized class to someFunction?

mock kotlin object from java junit test i have this kotlin object open class EnvironmentVars { val variables: Map get() = System.getenv() } Now, I need to test this from a Java Junit test, @Mock private EnvironmentVars environmentVars; @Test public void makeSureVarsCaseInsensitive() { LoaderFactory lf = new LoaderFactory(); // setup the mock Map myMap = new HashMap(); myMap.put("ENV", "ok"); when(environmentVars.getVariables()).thenReturn(myMap); // check caps...

onClick event in navigation drawer does not work Disclaimer: I already read the post at onClick event in navigation drawer, but sadly it does not work for me. I am pretty new to Android I am just making my first app in Kotlin and I wanted to integrate an NavigationDrawer. In it I have integrated an option "Website" which should just launch a website. Just when I click on it it closes the drawer, but does not start the Intent for the website. My...

Java 8 Date API - Get total number of weeks in a month I have a Kotlin function to get the total number of weeks in a month defined as such: Code fun getTotalWeeksInMonth(instant: Instant): Int { val calendar = Calendar.getInstance() calendar.time = Date.from(instant) return calendar.getActualMaximum(Calendar.WEEK_OF_MONTH) } However this is using a mix of the old Java date/time APIs (Date and Calendar) and the new APIs (Instant) How would I achieve the same result, using just the new APIs?

How can I catch an exception in Kotlin coroutine when I am awaiting it in another function? Sorry for the vague title, couldn't come up with something better. So I read this article and wanted to do the same. problem is that I can't do try { promise... } catch (e) { } cause the error gets swallowed. I can catch the error where I await it, but I don't want that. and my code looks like this: typealias Promise = Deferred fun Promise.then(handler: (T) -> R): Promise...

Room: handling complex data I have json received from a rest service which is comprised of some persons with each having a list of ids referencing some skills with each having a list of ids referencing some skill types: { "person": [{ "id": 1, "name": "Biatrix", "age": 29, "skillIndices": [ 1, 2 ] }, { "id": 2, "name": "Oren", "age": 27, "skillIndices": [...

Change bottom navigation selected item color androidx xml file drawable file: Gradle dependency implementation 'androidx.appcompatappcompat1.0.0-alpha01'

Why do when adding a column all rows get the value of null? I'm trying to add a new column to an existing table. Expected to be UNKNOWN instead all rows get the value of null. Please help. Here's my code. Grade.kt package com.example.demo.model import javax.persistence.* @Entity class Grade { @GeneratedValue @Id var id: Long? = null var grade: Int? = null var name: String? = null var enabled: Boolean = false @Enumerated(EnumType.STRING) var studentStatus: StudentStatus = StudentStatus.UNKNOWN } First I created...

Kotlin : problem with appcompat and gsm play service why does my app crashes when I have this : dependencies { implementation fileTree(include: ['*.jar'], dir: 'libs') implementation "org.jetbrains.kotlinkotlin stdlib jdk7$kotlin_version" implementation 'com.android.supportappcompat v728.0.0' implementation 'com.android.supportsupport v428.0.0' implementation 'com.android.supportdesign28.0.0' implementation 'com.android.supportsupport media compat28.0.0' implementation 'com.android.support.constraintconstraint layout1.1.3'...

Gremlin Driver Cannot Deserialize Response from Germlin Servier Running Bitsy Database I'm running a gremlin server with bitsy using the conf and properties file given in the github repo (https://github.com/lambdazen/bitsy/tree/master/src/test/resources/gremlin-server). I have, of course, changed dbPath to an appropriate path. My client is a kotlin application running gremlin console. I have no problem executing queries that result in string or map values,...

Generics Type and subtype Kotlin Is there a way to do something like this without having to specify two generic parameters? open abstract class test { lateinit var varZ : Z lateinit var varT : T } For example, I'd like to write something like this (which doesn't compile):) open abstract class test { lateinit var varZ : Z lateinit var varT : T }

Fatal EXCEPTION:main , kotlin.KotlinNullPointerException I want to build code that upload images and videos to firebase. I used two methods called onSaveInstanceState() and onRestoreInstanceState() for save variables. it's works !! ..but when activity gets rotation it gives error like below Here is my code : storage= FirebaseStorage.getInstance()...

Bytebuddy: method interception doesn't work in Kotlin Consider the following bytebuddy program to intercept method call load(): public class ByteJavaBuddyTest { public static class MemoryDatabase { public List load(String info) { return Arrays.asList(info + ": foo", info + ": bar"); } } public static class LoggerInterceptor { public static List log(@SuperCall Callable zuper) throws Exception { System.out.println("Calling database"); try { return...

error: [dagger.android.AndroidInjector.inject(T)] Found a dependency cycle: I have a SecurityService class to get a token with Rx2AndroidNetworking to whom I established an OkHttpClient that contains an interceptor and an authenticator that also require the call of the token which is causing me a cyclical dependence class SecurityService @Inject constructor(private val preferenceHelper: IPreferenceHelper, private val httpClient: ApiHttpClient): ISecurityService { override fun getToken(request: TokenRequest): Observable =...

Kotlin always tells me KotlinReflectionNotSupportedError I've just started converting to Kotlin from Java. I have a question: when I'm reflecting something like: XXClass::class.java or anything else. They don't work in JAR, but work fine from IDE. I'm using gradle modulebuild or gradle modulejar to generate the JAR file. After generating, it always tells me KotlinReflectionNotSupportedError: Kotlin reflection implementation is not found at runtime. Make sure you have kotlin-reflect.jar in the classpath. But I've already added them into...

Kotlin: foldLeft like in Scala? In Scala there is beside fold also foldLeft and foldRight. The difference is basically that the initial value (in foldLeft/foldRight) of the folding does not have to be of the same type T as the folding is applied to. Does Kotlin also have foldLeft? I've only seen foldRight so far, but it seems the initial value also has to be of type T. Can someone explain the difference and if there's foldLeft in Kotlin and why (perhaps) not?

How to create a class that came be used by other classes when there are only a few variable differences in kotlin I have 4 fragments that all use the same code with the exception of a few variables being different. the variables differ in name and then there are functions that call those variables. but all the rest of the code is copy and pasted. 99% the same. How do i properly create a class that other classes can inherit from and override the names of those 2-3 variables and function calls

How to open more than activity from Main Activity in Kotlin? I have created 2 Activities in Kotlin other than main activity (total 3 activity, 1.activity _Main, 2. activity _A, 3. activity _B).... now I want to make something that when button A is clicked than activity_A is open and when button B is clicked than activity_B is open.

How to upload array data to Firebase Firestore I have the following code for uploading to firestore: Map map = new HashMap(); map.put(ConstHolder.PHONE_NUMBER_KEY, phone_number); map.put(ConstHolder.STATE_KEY, state()); map.put(ConstHolder.PATH_KEY, cloudFilePath); map.put(ConstHolder.DATE_KEY, date); map.put(ConstHolder.CREATED_DATE_KEY, createdDate); map.put(ConstHolder.HINT_KEY, textFromHints()); All of the map's fields are just String and int so far. But now, I also need to save object as...

Create Observable with dispose handler rxjava We want to observe the changes in the size of a view and we create an extension like this: fun View.layoutSizeObservable(): io.reactivex.Observable { return io.reactivex.Observable.create { emitter -> viewTreeObserver.addOnGlobalLayoutListener { Log.d("MainFragment", "ViewTreeObserver Listener called back.") if (measuredWidth > 0 && measuredHeight > 0) { emitter.onNext(Size(measuredWidth, measuredHeight)) } } } }...

How to achieve non blocking with Coroutines I am trying to achieve non IO blocking coroutines (kotlin) in a way that will gain more network calls than threads. It is clear how to use coroutines in a way that doesn't block the main thread, however eventually each coroutine runs within a tread and a network calls blocks that thread (for comparison, using NodeJS allows to reuse the working thread while other requests are waiting for the response to come back). My use case is that for each incoming request I need to make 2-3 independent...

How does Kotlin dispatch the invoke operator? How does Kotlin disambiguate function calls, constructors, companion objects and invocation overloads? In Kotlin 1.3.11, I can declare two homonymous members in the same scope: fun main(args: Array) { fun test() = println("test function") val test = object { // I think this should fail to compile, but it does operator fun invoke() = println("test invocation") } test() // Prints: "test function" } But there is some weird interaction with scope. If I move...

SQLite Database is not showing Record in Kotlin In my project, I am adding data to SQLITE database in which I am able to successfully load data into the database while trying to retrieve the data then I am not getting any error in the log as well as I am not getting the result too. I am simply seeing the layout in the list_item.xml. Below is my code and Any help is appreciated. Language Used Kotlin Error No Error in the Error log message. Warning Not supplying enough data to HAL, expected position Code Adapter: class...