Gson: How pass JsonObject/JsonElement as serializable? In my Kotlin project I must use com.google.gson.JsonObject. val jsonRedir = JsonObject() someCustomMethod(jsonRedir) The problem is that method someCustomMethod has one Serializable paramter. But JsonObject is not Serializable. How I can fix this? I must pass exact JsonElement or JsonObject to someCustomMethod

Is there a generic way to deserialize single-valued value objects (without custom Deserializer) in Jackson We use a lot of value objects with a single value. For (de-)serialization we use Jackson with the kotlin-module. A example value object in Kotlin: data class MyValueObject(val value: String) or as Java class MyValueObject { private String value; public MyValueObject(String value) { this.value = value; } public String getValue() { return value; } } These value objects have to be serialized and deserialized and should be serialized "value only", eg. "theValue" instead of...

Tab layout in kotlin example I am developing an app using kotlin, Since I am a beginner in kotlin can someone please help me with - implementing slider layout with view pager, with tab style for all slider fragments?

Passing information between two alert dialogs ImageView in first alert dialog opens second dialog to change an imageResource of the ImageView in the first dialog. However I don't know how to make connection between two alert dialogs Both have different xml layouts, so I assume that in second dialog I should make a reference to the layout of the first dialog private fun editItemDialog() { val dialogBuilder1 = AlertDialog.Builder(this) val inflater = this.layoutInflater val dialogView = inflater.inflate(R.layout.edit_dialog,...

MVVM design pattern implementation in kotlin for a recyclerview I am a beginner in Kotlin and trying to implement MVVM design pattern on android development. I have to implement a Recyclerview in a fragment. How we can set adapter with value to a recyclerview from the viewmodel class since the api call is observed within the viewmodel. My fragment class is look like as below class NotesFragment : Fragment() { lateinit var binding:FragmentNotesBinding lateinit var viewModel:NoteListViewModel companion object { fun newInstance(param1: String):...

Does "in" operator manage switiching position in destruction declaration While playing with Kotlin Koans I have found that Kotlin has a collection function called withIndex that has the following signature : fun Array.withIndex(): Iterable while IndexedValue is a data class : data class IndexedValue with the following constuctor : IndexedValue(index: Int, value: T) What I didn't get is that when I switch product and index their value get switched thing that I think is managed by in operator. for ((product, index) in products.withIndex()) {...

CallBack after object instanciation, which contains asynchronous function I got a Product class, which is constructed with a code. This code is made to call the open food facts API to instanciate all the class variables. The fact is the API call is an asynchronous function. So in my main Thread, when i try to access my object parameters, it's empty. Since i cannot interrupt the main Thread, how am i suppose to make a callback on my object instanciation ? Here is the code Product.kt class Product(code: Long) { val client = OkHttpClient() var name:...

Creating a GET method with request body in kotlin using ARest Framework I am setting up a new service consisting of GET, DELETE and POST method APIs using ARest framework in kotlin. I am wrapping up the inputs in a data class and passing it out to the methods. In this case DELETE and POST method works fine but I face some problem with the GET method. Data class for wrapping the input : class GetRequest(@QueryParam("aaa") var aaa: String? = null, @QueryParam("bbb") var bbb: String? = null,...

Delegate runner 'androidx.test.internal.runner.junit4.AndroidJUnit4ClassRunner' for AndroidJUnit4 could not be loaded I try to run Kotlin instrumentation tests for android. In my app/build.gradle: android { dataBinding { enabled = true } compileSdkVersion 28 defaultConfig { applicationId "com.myproject" minSdkVersion 18 targetSdkVersion 28 versionCode 6 versionName "0.0.7" testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" } sourceSets {...

BoundaryCallback for PagedList never gets called I've created a Room Database on my device, which returns // The Int type parameter tells Room to use a PositionalDataSource object. @Query("SELECT * FROM Word ORDER BY id") abstract fun getByFactory(): DataSource.Factory This factory call is then used in my repository, where I connect it with my boundaryCallback val boundaryCallback = MyBoundaryCallback() return wordDao.getByFactory().toLiveData( pageSize = 20, boundaryCallback = boundaryCallback ) My boundary callback is basic...

How to handle addListenerForSingleValue properly after onSaveInstanceState I'm using Firebase from a long time and I really appreciate its flexibility to fetch some data from its realtime database with low effort. However, I'm having some problems on handling the result of the call of addListenerForSingleValueEvent. Every time some UI operation has to be performed after it returns my application crashes if onSaveInstanceState has already been called. There is any way to abort the operation during onPause() the same way we can do with addValueEventListener? I know...

How to lazy inject class in Kodein? I need to write wrapper for my repositories (it also known as Unit of Work) in Kotlin Android application using Kodein. It would look something like this and will be registered in RepositoriesModule: class RepositoryWrapper(val first : FirstRepository, val second : SecondRepository) : Wrapper object RepositoriesModule { val module = Kodein.Module(name = "RepositoriesModule") { bind() with provider { AndroidFirstRepository() } bind() with provider {...

Evaluate code block in Kotlin (to hide variables inside scope) In Scala, you can write val x = { ... do some complex computations .. 42 } to hide stuff inside of the code block. The closest I came in Kotlin is: val x = { ... do some complex computations .. 42 }() Is there a better way? EDIT: isn’t run {} in the above example essentially the same is calling run costly?

How exactly does bufferedReader() work in Kotlin? So I'm trying to read data from a .json file in my Android project: val file = context.assets.open("myfile.json").bufferedReader().readText() This works fine and successfully prints out my .json file as one String. However I want to know how exactly bufferedReader() and why .readText() can't be called directly on the opened .json file.

Make a notification when device is connect to internet How to send a notification when I will connect my device to the internet? I want to make this like Facebook or Snapchat. When I connect a device to the internet, these apps send notifications to me. How I can make this?

smart home like application choose image particular gadget in android studio I have a map that includes a lot of gadgets. like AC, Light, Tv, etc.like a smart home application I want to choose a particular gadget on the map image which in the show in imageView problem is how to select the product in the image I write below reference code link for image selection Image Selection but it draws a square on the image but I want to be selected a part of the image for example, I have a human image. I...

OpenApi/Swagger CodeGeneration, specify class access controller to "open" Using OpenApi to generate clients code based on Specification. I managed to change package names based on the config file, yet didn't find any option of changing classes access controller I would like to change a few class, or all, to open (While generating code to kotlin, the default final) Generated classes should be open to inheritance. How can I specify code OpenApi or Swagger code generator to generate open classes?

I need help for post to my api. What should I do? I'm making a login for my application. Which I am currently stuck in posting problems to my Api This is my Api that is made to support login. { success: false, message: "Please provide complete and accurate information.", data: [ ] } fun loginUrlSuccess(urlApi : String) { Log.d("login", urlApi) authSignin_cgi = gson.fromJson(urlApi, DtoProfile::class.java) loginsSuccess = authSignin_cgi.success val queue = Volley.newRequestQueue(context) val stringReq =...

using foreach like an expression I would like to use a foreach loop as an expression (just for fun) but i'm not able to do it, and i'm stuck on it In my example i want to convert a String to a bytecode representation of this String. What's working, but is ugly in my opinion fun bytecoderepr(arg: String):String { var bcr:String = "" arg.toByteArray().forEach { bcr += it.toString() } return bcr } Works as expected and returns "10399111110102524848" for "gconf400" What's not working, but i'd like...

How to convert String to Function in Kotlin? fun getApple(): Apple = {...} fun setOrange(orange: Orange) {...} val funMap = hashMapOf("getApple" to this::getApple, "setOrange" to this::setOrange) funMap["getApple"]() I want to put the method in the map. Then get the method by string, but can't be invoke if function type different. Any other way to convert string to function?

Why is Kotlin's Random number function called nextInt()? The documentation says: Gets the next random Int from the random number generator in the specified range. I'm struggling to understand the "next" bit - as if there was an initial Int... Why is it not simply called Random.random(10)?

Access Main thread from coroutines I am testing a class that shows an alertDialog and I want to do some UI testing. The problem is that both the dialog and the espresso task need to run in the UI thread but, the espresso task is not executed, it's waiting for "someone" to select an item from the UI. So the test intends to show the alertDialog and select an item (with espresso) and then assert that the return from the function that showed the UI return the selected item value. This is the class I want to test: class...

Not using Kotlin in my code but still getting kotlin error while building a signed apk after adding some dependencies While trying to build a signed apk using progaurd rule enable, i am getting some error Kotlin message and error dependencies. In my android code i am not using any Kotlin but still, it is showing the error. While in the unsigned apk i am not getting any error. I am using the latest version of Android studio and all my dependencies and gradle files are updated and also i have migrated all my codes to AndroidX. my error message Cannot find a version of 'org.jetbrains.kotlin:kotlin-stdlib'...

Replace object in list by id in Kotlin I want to check by id if object is in list and if yes I want to replace that object by new. I tried to use map to do that: products.productsList.map{ if (it.dbId == prod.dbId) prod else it } but it doesn't work. I want to replace all object not field one by one. Any ideas? For better understanding. I have object: newProd = Product(dbId = 1, name, etc) and list of...

Unresolved reference:DetailActivity I am working through an example of changing an image in Android Studio, but cannot work out what is the problem with Unresolved Reference for DetailActivity. I am working thought this example and cannot see what is the problem or what is missing. package com.example.sandpit8 import android.content.Intent import android.os.Bundle import android.support.design.widget.Snackbar import android.support.v7.app.AppCompatActivity; import android.telecom.Call import android.util.Log...

Confused with Data class items in This array (POKOs) I am getting this data from my API. Confused with Pokos or data class. How can i access only values ? Thanks in Advance

Display MJPEG image fullscreen within WebView I'm trying to display a MJPEG Video Stream from a AXIS Video Encoder within an Android WebView. Basically I'm nearly at the point where I'm happy with the result. On a Phone (Samsung Galaxy S8) it looks perfectly and fills the whole screen. But on a Tablet (Galaxy Tab A) I get a black Border around the Image in the WebView. I already set a bunch of options to the Webview to disable scrolling and so on. settings.loadWithOverviewMode = true settings.useWideViewPort = true settings.cacheMode =...

add value from campanion object to textview // class where i define a value name as mobilno class UserInfo{ companion object { var mobile:String="" var itemId:Int=0 var mobilno:String="03134701365" var qty:Int=0 } } enter code here UserInfo.mobilno=findViewById(R.id.verify_no)

Which is better for Java Developer to learn Kotlin or Scala? [on hold] Which Programming Language is better to learn for Java Developers either Kotlin or Scala? and also as Job perspective and future endeavor

Share jsContext on LiquidCoreAndroid I investigate how can I use LiquidCore in my Android Application. The problem I found is that if I create more JSContext()- I tried with 3 - the memory increase a lot, to about 230MB just for 3 JSContext(). The documentation say that "To get started, you need to create a JavaScript JSContext. The execution of JS code occurs within this context, and separate contexts are isolated virtual machines which do not interact with each other." Is there any way share JSContext and to make them to have...