Android - mocking issue I have a custom class: class MyClass { var name = "" fun changeName(newName: String) { name = newName } } and my testing class: @Test fun testVerifyMock() { val instance: MyClass = mock() instance.changeName("newname") Assert.assertEquals("newname", instance.name) } I'm faily new to Unit Tests and I'm kinda stuck, can someone please point me to why I get this error: java.lang.AssertionError: Expected :newname Actual :null Basically the call...

Android Room Database - LiveData - Update/Insert/Delete, skip observer (callback) I'm new in Room Database, and recently I faced a problem that has to do with modifying the App's database (update/insert/delete) without causing the callback in observer to be fired. This is the Dao class for my model: @Dao interface ReceiptRowDao { @Query("SELECT * FROM my_model ") fun getMyModels(): LiveData @Update fun update(receiptRow: ReceiptRow): Int } My Database class: @Database( entities = [ (MyModel::class) ], version = 1,...

Autocomplete on Android Anko layout not working after migrate to androidX I want to update my android project with Anko layout library to androidX from android support library. I did these: Upgrade Android Studio to 3.2 Add these lines into gradle.properties android.useAndroidX=true android.enableJetifier=true Refactor all class from android design library to androidX Everything is good, I can build and run on my phone. But in my Anko UI classes most of functions or variables are red so autocomplete is not working because Android Studio can't find...

Latest android studio 3.2 not creating fragments with kotlin as a source language I am trying to create fragment using below steps but not able to create fragment in latest android studio 3.2. Is there any another way to create fragment. Steps to create which I used: 1) Go through 2) Added name of that fragment like below with kotlin as a source language. Followed above steps and hit finish button but nothing is...

Replacing fragments in FragmentActivity is freezing my application for more than 5 seconds I have FragmentActivity called StartupActivity. This activity holds 5 Fragments -> LoginFragment, LostPasswordFragment, RegistrationFragment, Login2Fragment, CityPickFragment. I can switch between fragments using ToolBar BackButton. Problem is, that replacing certain fragment using suppportFragmentManager and simple transaction is lagging the app. If I click BackButton it takes nearly 5 second to switch fragment. Fragments has simple layout with 1 ImageView 2 EditTexts and Button (+...

Can't run debug mode in intellij idea I can't debug Junit tests in just one of my projects in intellij idea. The error i get is "Error running 'Test': Unknown error'. I was trying to rebuild project, invalidate caches. Also I can, run tests, I just can't debug them.

Type not recognized with generics in Kotlin I have this interface: interface IInterface { fun test(body: T) } I want to implement this interface like this: class MyClass: IInterface { override fun test(body: JsonObject) { if (body is com.google.gson.JsonObject) { } } } My problem here is type JsonObject not recognized like "com.google.gson.JsonObject". So i can write this code without error in my compilator (intelliJ). override fun test(body: NotExistingClass__) { So, how to define the type of T...

Bean method into field injection I have TestConfiguration class ` @ActiveProfiles("dev") @ContextConfiguration(classes = arrayOf(Configuration::class), initializers = arrayOf(ConfigFileApplicationContextInitializer::class)) class TestConfiguration { @Bean @Profile("dev") open fun abstractRequestService(@Value(value = "\${apiUrl}") apiUrl: String, @Value(value = "\${defaultContentType}") defaultContentType: String): AbstractRequestService {...

Generic extensions of KProperty1 in Kotlin I have the following code: import kotlin.reflect.KProperty1 infix fun KProperty1.eq(value: R) { println(this.name + " = $value") } infix fun KProperty1.eq(value: KProperty1) { println(this.name + " = " + value.name) } data class Person(val age: Int, val name: String, val surname: String?) fun main() { Person::age eq 1 // Valid. First function Person::name eq "Johan" // Valid. First function Person::name eq "Johan" // Valid. First function Person::name eq...

Update of Android studio from 2.3.3 to 3.2. ERRORS I recently updated my Android Studio from 2.3.3 to 3.2 but unfortunately it have been two days, that I'm trying to fix bugs but, I resolved the most but I still have some problems that persist in my projects: 1/ The gradle build keep showing me this error about Kotlin version: The Android Gradle plugin supports only Kotlin Gradle plugin version 1.2.51 and higher. Project 'XXX' is using version 1.1.4-3. => The problem is my kotlin is declared as automated update version : classpath...

Kotlin for a Cordova/Ionic based plugin is it possible to use Kotlin as a framework/language as a Cordova plugin? first issue is that it's not copying the .kt file, because it looks for *.java or *.xml if so anyone know a reference on how to setup?

When consuming data from a REST API, is it better to generate a data class or just a simple normal class? Assume that I have an API which will return me a response about user information: name age In normal class, I will create a UserInfo class: class UserInfo (val username:String, val age:String) But I found a lot of people who suggested that it should be a data class (and part of them suggested it MUST BE): data class UserInfo (val username:String, val age:String) AFAIK, no matter UserInfo is a data class or not, it is public final by default, it auto-generates getter function of the...

Kotlin to SAP HANA char set I have Spring boot Kotlin application running on Tomcat 8.5 on JVM 1.8 and connecting to SAP HANA. I use JdbcTemplate.batchUpdate() for inserting data into tables. I have to deal with German alphabet and that causes some troubles. When I try to write data with SAP HANA Studio correct version of string is written - for example Qualität is written correctly as Qualität. When I use JdbcTemplate.batchUpdate, Qualität is exported as Qualit�t. How can I force JVM/Kotlin/JDBCTemplate to use...

How can I create a Room annotated subclass of a non Room one? Given the following initial model, everything seems to work OK with Room: interface ParentModel { val name: String val age: Int } @Entity(tableName = "parents") open class ParentRoom( @PrimaryKey override var name: String, override var age: Int) : ParentModel However, I don't want to use an interface, I want that to be a real class I can make instances of: open class ParentModel(open val name: String, open val age: Int) @Entity(tableName = "parents") open class...

requireNotNull vs sure operator !! in Kotlin We have a Kotlin based application and recently we added third party code quality tools (like Codacy). However, we started facing UnsafeCallOnNullableType errors. We found that approach viable to use is to add requireNotNull checks on all parameter which maybe null. Currently, we are using sure operator (!!) Do we have any specific reason or convention to chose one over the other. As far as I see, both will throw an Exception and will block the execution flow, except one will throw...

How to check whether a List contains null in Kotlin? I'm having trouble understanding why class Main { private val outputStreams: List @JvmOverloads constructor(outputStreams: List = LinkedList()) { if(outputStreams.contains(null)) { throw IllegalArgumentException("outputStreams mustn't contain null") } this.outputStreams = outputStreams } } causes the compilation error ...Main.kt:[12,26] Type inference failed. The value of the type parameter T should be mentioned in input types (argument...

Is there any way to use Koin inject with generic? I heve base class and I would like to use Koin injection on this base class like: abstract class BasePresenterFragment : BaseFragment() { lateinit var presenter: T by inject() // here is problem override fun onStart() { super.onStart() presenter.subscribe() } override fun onStop() { super.onStop() presenter.unSubscribe() } } I know there are solutions for inject viewModel but not for simple injection. So is there any way to use Koin...

File upload in spring webflux - Required MultipartFile parameter 'file' is not present I'm trying to upload a file using Spring Webflux, but I'm getting the error Required MultipartFile parameter 'file' is not present. @RestController @RequestMapping("/documents") class MyController(val myService: MyService) { @PostMapping fun create(@RequestParam("file") file: MultipartFile): Mono { return myService.create() } } I've also tried replacing @RequestParam("file") file: MultipartFile with ServerRequeset, but I get the error: "Failed to resolve argument...

Kotlin/Anko/OpenCV/CameraView can't create handler because thread hasn't called Looper.prepare() So, I'm currently attempting to convert a picture taken using CameraView into Grey Scale using OpenCV. After the picture is taken, I use Anko in order to process it asynchronously. After the processing is done, I write the image to the MediaStore. The Activity has a CameraView and a Button to take the picture. However, when I press the button,...

Can I instantiate an object by the class name in Kotlin What is the equivalent of the following Java code in Kotlin? Class.forName(className).newInstance()

Kotlin Android MVP + Dagger 2 lateinit property presenter has not been initialized Trying to use Dagger with Kotlin on Android. And got the exception: Caused by: kotlin.UninitializedPropertyAccessException: lateinit property presenter has not been initialized at com.ad.eartquakekotlin.main.MainFragment.onViewCreated(MainFragment.kt:43) at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManager.java:1471) at androidx.fragment.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1784) at...

Kotlin declaration cannot be used with the specified API version I have an issue with Kotlin in Android Studio 3.2, for some cases I get the message, that a certain declaration cannot be used with the specified API version, for example this one: For some reason Android Studio thinks, I am on API version 1.0 even though I specified a newer version: buildscript { ext.kotlin_version = '1.2.71' repositories { google() jcenter() } dependencies {...

MvRx xml layout files not rendering in android studio In the example repo from AirBnBs new framework MvRx xml layout files does not render in the android studio editor as shown in the screenshot below. Neither can I make the views render in Android Studio for my own projects full_screen_message.xml FullScreenMessageView.kt: package...

R.id not found when writing Espresso test I tried writing a small test to try Espresso. package com.mycompany.myapp.somemodule import com.mycompany.myapp.R import other.uselful.imports @RunWith(AndroidJUnit4::class) @LargeTest class DemoTest { @get:Rule var startActivity: ActivityTestRule = ActivityTestRule(StartActivity::class.java) @Test fun aDemoTest() { onView(withId(R.id.theElementId)) .check(matches(isClickable())) } } Android Studio doesn't show any error. if I ctrl+click on...

Stop bash script from dying when exiting Java / Kotlin application I'm starting a bash script from Kotlin, but the bash script stops running as soon as the Kotlin application exits. val pr = ProcessBuilder("/home/vlad/liq", script, input).start() Where script is a liquidsoap script and input is a parameter that's being passed into the script Typically, it'll run something like the following: ./liq blah.liq http://somedomain.com:8090 liq then executes a liquidsoap script which is the first param and the second param is then used as a param for the...

How can I call an intent from a fragment Calling an intent with onClick Listener from an activity is not a problem, but the same code in a fragment throws an unrechable code error in Intent that says none of its constructors can be called with these parameters. Here's my code: class FragEqCrew : Fragment() { override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? { // Inflate the layout for this fragment return...

What are the best online certifications in programming? [on hold] I'm thinking about attacking online certifications in programming and i want to know what are the best ones that can help me work in companies in real life (in addition to capacities and skills i know). Thank you

Android Navigation Component with Transition from Drawerlayout Is it possible to change the transition effect from opening a fragment from a drawerlayout with the android navigation component. There is nothing in the android docs.

Hibernate lazy relations are fetched n+1 without properties being called I am using hibernate and doing a simple query to select all of a given entity. I only want the entity and not its relations. However hibernate does fetch the relations and the relations of the relations, in a n+1 manner. It's a Spring Boot application and written in Kotlin. The relations are annotated with FetchType.LAZY and the query i'm doing looks like so: entityManager.createQuery("SELECT a FROM Apartment a") .resultList This is the only code that i am calling and i do NOT even...

Spring Boot Mongo findById returns null I have a collection, with documents having a field named _id of type String, not generated manually. I have been trying to get a document using its id. val criteria = Criteria.where("_id").`is`("a2z3e44R") val document = mongoTemplate.findOne(Query.query(criteria), MyDocument::class.java) // returns null val criteria = Criteria.where("_id").`is`(ObjectId("a2z3e44R")) val document = mongoTemplate.findOne(Query.query(criteria), MyDocument::class.java) // returns null val...