Kotlin set variable and call method in main class from companion object I'm new to Kotlin, and I don't understand if/how I can call a function or set a variable from the companion object: class MyClass { public var myVar: Boolean public fun myFunc(): Int { ... } companion object { private fun doStuff(){ myVar = true myFunc(1) } } } I get unresolvedReference on myVar = true and myFunc(1).

Insert an object inside an object using Room library in android Directory model @Entity(tableName = "directory") class Directory(@Expose @SerializedName("id") @PrimaryKey(autoGenerate = false) var id: Int? = null, @Expose @SerializedName(DIR_NAME) @ColumnInfo(name = DIR_NAME) var dirName: String? = null, @Ignore @Expose @SerializedName(DIR_IMAGES) var dirImages: List? = null ) : Serializable { companion object { const val DIR_NAME = "dirName" const val DIR_IMAGES = "dirImages" } } Image model...

Android Studio 3.1.2 can't delete file opened by itself I just installed brandnew Android Studio and haven't to mess with the configuation. It happened when I try to clean Kotlin project, I didn't even touch the code or the config manually. Kotlin is configed by running Configure Kotlin in project and I press clean project. It fail to delete a file and it has to be deleted manually after closing Android Studio. Later it failed to create debug directory 'C:\Users\myname\AndroidStudioProjects\thesimpleplainbasic\app\build\intermediates\res\debug'

[TOO_MANY_ARGUMENTS] [Here is my code, it throw me the error: [TOO_MANY_ARGUMENTS]Too many arguments for protected/protected and packege/open fun onACtivityResult(requesteCodeInt,resultCodeInt,date:Intent): Unit in android.support.v7.AppCompatActivity

RecyclerView SnapHelper - how to change background of snapped and unsnapped items? I'm using recyclerview with horizontal LinearLayoutManager. I want to change recyclerview item color, when item is snapped in a middle. So i used LinearSnapHelper. At the moment, each items, which were previously snapped stays with snapped background color. So I saved snapped item position in adapter and then in onBindViewHolder I accessed snappedPosition and change background of each recyclerView items to default except snapped one. But after notifyItemChanged(position) ive got...

kotlin Extension function in assertj I'm try to implement a extension function in my test with assertj. I have a custom exception like this: class MyException: Exception { constructor(message: String, code: Int) : super(message) constructor(cause: Throwable, code: Int) : super(cause) } I would like to check the property code in my test. unfortunately we use the java assertj, that's why I tried to implement a extension function. I have the following, my test: @Test fun `Creating webdto without name fails`()...

Calling finish() on a child activity is closing the entire app instead of only that activity I have an abstract class called BaseActivity that I use as a base for some other activities on my android project to handle some common code. This was made in Java and I didn't have any problems with this but now I'm migrating this BaseActivity class to Kotlin and I'm having the following problem: Once when one of the implementations/child's of the BaseActivity calls the finish() method to close his correspondent screen, the app itself closes. Also note that this problem is happening when...

Kotlin primary and secondary constructors during inheritance I am learning Kotlin and I'm kind of stuck with the constructors. I've written a program to help me understand the concept. The program is as follows: open class Animal(){ var name :String = "noname"; constructor(name:String):this(){ this.name = name } open fun eat(){ println("$name the animal is eating") } } class Dog: Animal{ constructor():super() constructor(name : String):super(name) override fun eat(){ println("$name the dog is...

Anyone knows how to use mpandroidchart in kotlin Android latest I tried to use it but getting some commands missing. like they are available but not working with other commands like I watched them in java tutorials.

Kotlin .kt files not recognized in Android Studio I opened my Studio today and Android Studio didn't recognize Kotlin files. .kt files started showing up as just an ordinary file. I checked my Plugins and I still have the Kotlin plugin. I tried uninstalling and installing it again. But no use. I tried building my building my project from Terminal and it works fine. But Android studio doesn't understand Kotlin files. Configuration: Android Studio 3.1 kotlin_version = '1.2.41' OS: MacOS Sierra

Staggered layout with FlexboxLayoutManager I there any way to implement a staggered layout using google's Flexbox library similar to this The above layout is created using StaggeredLayoutManger also maintaining the aspect ratio of the image I have tried the code: recyclerView.apply { layoutManager = FlexboxLayoutManager(context).apply { flexWrap = FlexWrap.WRAP justifyContent = JustifyContent.CENTER }...

Android Toast lost its background in my App As an android developer we know Toast's most role in whole application. I have a problem with Toast in my application. It's alignment is not center with the text. I have added image here. Please lemme know the issue. fun putToast(content: String) { Toast.makeText(this, content, Toast.LENGTH_SHORT).show() } and the code snippet i have shared here.

Navigationbar doesn't fitSystemWindow after adding a Fragment to the content My NavigationView doesn't appear below the status bar any more if I commit a Fragment transaction. Why does adding a layout to the content (mActivityContent in layout_slidingpanel.xml)) affect it's parent views? The following order applies to the layout hierarchy: activity_main.xml: layout_slidingpanel.xml: Then, a LibraryFragment is added to the mActivityContent FragmentLayout: supportFragmentManager.beginTransaction()...

How to initialize Array<List<Model>> in Kotlin? I have a JSON string which coming from rest API and I'm binding that into List object. I have all category/sub-category data into this list object List but I don't know how to separate sub-categories from those data into Array format. How can I add sub-category list into Array object? How can I declare and initialize Array in Kotlin? All categories should be in List format and all sub-categories in Array format. For Example: List Array, List>, ...etc>> CategoryDO data class: data...

SomeApp "is never used" Below in the image 1 you can see I created a Kotlin class that extends from the Application() class: I also added the necessary stuff in my Manifest file as you can see in the next image: However I can't figure out why Android Studio maintains that I am NOT using my Class at all! It is underlined and grayed out and on mouse over you see...

How to create an AWS Lambda function on Kotlin? Does AWS Lambda functions provide support for Kotlin language? Currently Lambda function creation wizard don't contains Kotlin option in the runtime dropdown list: But there are Java 8 and different Node.js versions. Which platform is more appropriate for function written on Kotlin in context of AWS Lambda - JVM or Node.js? And which Kotlin frameworks can I use to write a Lambda function?

Object is not part of the schema for this Realm in Kotlin I have one open class like this open class NewsResponse( @field:SerializedName("news") val news: List? = null ):RealmObject() And NewsItem class like this open class NewsItem( @field:SerializedName("created") val created: String? = null, @field:SerializedName("link") val link: String? = null, @field:SerializedName("description") val description: String? = null, @field:SerializedName("title") val title: String? = null ):RealmObject() I have also added apply plugin:...

RxJava2. Execute a request for every item in a list I have a list List FileModel is just a class contains id: Int id - is ID of photo file I need to fetch and cast to Bitmap I have a request: fun getFile(fileId: Int): Single This request returns ResponseBody which we can cast to Bitmap And fun generatePhoto(responseBody: ResponseBody): Single What I want is to create a function fun getPhotos(list: List): Single { // Execute getFile(...) for each item in the list // Cast getFile(...) result to Bitmap using...

Android Studio 3.2 Canary 14 error anyone tried the new Canary build of Android studio with Navigation Editor? It does not want to run with GitHub viewer sample from Google. I mean it compiles without errors but I can not visually see what there should be with fragment navigation, only "Waiting for the build to finish" although I tried to build the project like 20 times Here is the screenshot: As you can see, it is from Android architecture samples,...

How to fix conflicting Kotlin dependency in IntelliJ IDEA? We're creating a multi-platform project in Kotlin and part of a certain module uses the experimental coroutines feature. We're using Gradle to build the project/library together. The common module's gradle build script looks like this: apply plugin: 'kotlin-platform-common' dependencies { implementation "org.jetbrains.kotlinkotlin stdlib common$kotlin_version" implementation...

Kotlin - NDK - nullable type I have simple data class that I am returning from NDK. However, in some cases, I want to return null pointer and test it in Kotlin code. How to achieve this? My data class: data class SimpleData(var name: String? = "") In Api file: external fun getSimpleData(): SimpleData NDK file: JNIEXPORT jobject JNICALL Java_cz_MyAPI_getSimpleData(JNIEnv *env, jobject thiz) { if (some condition) return nullptr; //fill and return SimpleData //filled via jobject obj = env->NewObject...

Spring boot kotlin unit testing on files I am using spring boot kotlin to develop my application that consume Google Trends rss feeds. for Testing I am using Junit4 and Mockito this is my code interface GoogleFeedsInterfaceService { fun googleRss(url: String, xInt,yInt):List { val reader = XmlReader(URL(url)) val feed: SyndFeed = SyndFeedInput().build(reader) return feed.entries.subList(x,y) .map { entry -> Rss( title = entry.title, image =...

How to start activity from adapter in kotlin android I have created a simple Adapter. I am trying to start Activity from within the Adapter when user clicks on an item. I am not able to get the context in the onClick. I am performing onClick inside MyViewHolder class. Here is my adapter code: class LeadListAdapter(context:Context, private val leadList: List) : RecyclerView.Adapter() { var activity:Context = context override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder { val inflatedView =...

Kotlin android Tabhost Can anyone help to tell me how to create xml and kotlin file for each tab in order to design layout and run some function? I would like to design every tab in order to show different info and run different function in each tab. here with my code of activity_main.xml:...

setBackgroundColor recycleView in fragment [duplicate] This question already has an answer here: findViewById in Fragment 31 answers How do I “findViewById” with fragments? 2 answers...

Android crash inflating behaviour I'm trying to add a bottom sheet in one of my apps. I know how to use them and I implemented one while following a medium tutorial (and reading the problems people had in Stack Overflow) which works just fine. But when I try to replicate that in my project, it keeps crashing no matter if I put it in the main Activity or inside a Fragment. It's driving me crazy as it crashes even if I copy the same xmls and procedure from the example I have working. activity_main.xml...

Issues while translating a static method to kotlin from java I am trying to understand and translate a java code to kotlin. The code is available here. Basically there are two class files DeviceListActivity : Allows user to select an item from a ListView SerialConsoleActivity : Performs read/write operation on the selected item The relevant code section from...

TimerTask is not getting called In MainActivity.onCreate() I set up a timer: val t1 = fixedRateTimer("PingTask", true, initialDelay = 0, period = 10000) { val pt = PingTask(myDataset, myStatus, viewAdapter) println("Initializing timer...") } The timer class looks like this: class PingTask(val hosts: Array, val hostStatus: Array, val adapter: MyAdapter): TimerTask() { override fun run() { println("Timer called...") But it seems that it's never called, because there is no output...

Margin 8 dp everywhere, top, right, left and bot I want to have 8dp margin everywhere, top, left, right and bot, so I set Layour_Margin all 8 dp, check my xml: but this no work good, check how it's look, on top i dont have a margin

Android AlarmManager and BroadcastReceiver empty intent data I have found out that somethings work wrong on Android O. I have done the implementation of Reminder functionality. I wanted to send broadcast on fixed time. AlarmManager works correctly, BroadcastReceiver executes onReceive but the intent has no data. I have checked everything and while I set up alarm data is attached to the intent. I think that in past it was working well and something has happened in the meantime. Here is the code that shows how I set up Intent, PendingIntent and alarm....