when click on hamburger icon sometimes not open navigation drawer in android when click on hamburger icon sometimes not open navigation drawer but sometime work perfectlySometime issue with click on hamburger icon.Help me solve out this issue.My code is here :- activity_main.xml :- My Kotlin File :- override fun onNavigationItemSelected(item: MenuItem): Boolean { when (item.itemId) { R.id.navFormula -> { } } drawer_layout.closeDrawer(GravityCompat.START) return true }

Use Kotlin annotation class in Java class I'm writing new features in Kotlin but some stuffs are already wrote in Java. I'm writing tests in Mockito(Kotlin) but Mockito has problem with final class so I created: annotation class Mockable { } And I add: apply plugin: 'kotlin-allopen' allOpen { annotation('com.Mockable') } So using this annotation class I can mock Kotlin class. And there is my question. How I can use this annotation in Java class ?

How to import type extension function in Kotlin I wrote an extension function for Any type, that will retrieve object property value by its name. I want to be able to use it from everywhere in my project. Here is my extension function: package com.example.core.utils.validation import java.util.NoSuchElementException import kotlin.reflect.full.memberProperties fun Any.getFieldValue(fieldName: String): Any? { try { return this.javaClass.kotlin.memberProperties.first { it.name == fieldName }.get(target) } catch (e:...

Is it possible to get basePackages value from Spring application context? I'm working on a Spring extension (implementing some logic in a bean that will be constructed by Spring and provide some useful features to a developer). Is there a way to get basePackages (ComponentScan uses it to find our beans) value from my bean?

Extract substring between given strings Given the following string: be_de=Interessant für Dich; be_fr=Intéressant pour toi; What is the nicest way to extract the substring for a given locale in Kotlin? e.g. I have given the locale be_fr I want to have Intéressant pour toi as a result. The string is always in between the locale followed by a = and a ; There could be more locales with strings given, and the position of the value to extract always varies. Of course I could just create a substring after the first index of my...

Mockito test View visiblity I want to write test for view visiblity. I have something like this @Test fun showProgressBarTest() { val eventPlannerListFragment = Mockito.mock(EventPlannerListFragment::class.java) eventPlannerListFragment.showProgressBar(true) assertEquals(View.VISIBLE, eventPlannerListFragment.fragment_progress_bar.visibility) } But I'm getting: java.lang.NullPointerException at com.fs.wfm.ui.EventPlannerListFragmentTest.showProgressBarTest(EventPlannerListFragmentTest.kt:47) at...

Realm Kotlin file not able to access variables from class file I have a Person class, which is a RealmClass. I have a Kotlin File called RealmPersonRepo (it has an interface btw) which should be able to delete, set and get realm variables (don't know if they are called realm variables). RealPersonRepo can't find the realm variables. In the RealmPersonRepo.kt Android Studio cannot find return id, this.id = ..., return this.name, this.name = ..., etc. Here are my classes: Person.kt @PaperParcel @RealmClass open class Person: RealmObject(),...

RxJava execute something when multiple streams finish I want to execute something when both units and variables are set. How to do that? // getUserId(), getSomething(), getSomethingElse() all return Single getUserId().flatMap { getSomething(it) }.subscribe({ data -> units = data }) getUserId().flatMap { getSomethingElse(it) }.subscribe({ data -> variables = data }) execute(units, variables)

Center vertical in relative layout programmatically I have a linear layout like this: The following function gets a bitmap, sets it to an image view that has been created programmatically, then creates a trash can icon and puts the whole things into a relative layout and finally puts it into the linear layout. But there is a problem, I want the result to be like this: but the result becomes like this: <a href=""...

How can I communicate between an Android smarwatch and Tv running the same app? It seems I can't use WiFi Direct on the smartwatch and I would prefer to not have to use a bluetooth connection as it has limited range.

FireBase Firestore retrieve multiple documents by list of ID's I've got two collections for example Cities and Houses. Houses are not a nested collection of Cities, but a house contains a reference to a City. Wat is the most efficient way to get city information for each house in a list? For Example class City { var name: String = "" var property1: String = "" var property2: String = "" } class House { var cityId: String = "" var propertyA: String = "" var propertyB: String = "" } I've got a list of houses, how do I get for each house...

How does the delay function in Kotlin internally work? I have been trying to understand how Kotlin coroutines work and I came across the delay function. My understanding of this works is, delay suspends the current thread, where the thread, unlike sleep, does not consume CPU cycles and is freed to execute other tasks. How this works is that the code after the delay function is captured as a lambda(Continuation) and can be executed after the given time period by a different thread. The implementation seems similar to Javascript's execution...

Is extension function member function of particular class? Here two classes are given class A & B. class A has a extension function as a sub() and derived class B also has a same name function sub().If the extension function is member function of class A then why it can not be access by super keyword ???? open class A(var s : Int){ var a : Int = 5 var b : Int = 4 var c : Int = 0 constructor() : this(7) { //println("class A constructor has been called !!!") println("primary constructor value is $s") } fun...

Can't filter tests with includeTestsMatching I have a gradle project all written in Kotlin. While removing the deprecated junit gradle plugin I am unable to filter tests since I am getting this error: * What went wrong: A problem occurred evaluating root project 'the-project'.

Could not find method includeTestsMatching() for arguments [*MyClassPostfix] on object of type org.gradle.api.internal.tasks.testing.filter.DefaultTestFilter.

I am using Gradle 4.8, Kotlin 1.2.51, Junit5 5.2.0, and junit-platform-launcher 1.2.0. Relevant...

Gradle 4.4 requires Java 7 or later to run. Your build is currently configured to use Java 6 I imported a gradle project, from Kotlin Koans Project. Attempting to run the project Gives the Error "Gradle 4.4 requires Java 7 or later to run. Your build is currently configured to use Java 6."

Options Menu Available In All Activities I'm making an Android application and currently in my MainActivity I have an onCreate and listeners for an option menu. I want this menu available in all my activities and while I want to know if there's a better way to do that than copying the onCreate into each one. My code for the menu is below. // onCreateOptionsMenu() // Create options menu override fun onCreateOptionsMenu(menu: Menu): Boolean { menuInflater.inflate(R.menu.options_menu, menu) return true } //...

kotlinx.serialization convert Int to Boolean with custom serializer I've already spent a lot of time trying to write custom serializer, to replace Int (TINYINT from mysql) to Boolean during serialization. Using Gson I do it without problems, something like this (java): public class BooleanSerializer implements JsonSerializer, JsonDeserializer { @Override public JsonElement serialize(Boolean arg0, Type arg1, JsonSerializationContext arg2) { return new JsonPrimitive(arg0 ? 1 : 0); } @Override public Boolean...

How to wait for thread to initialize variable in Kotlin? I have an JavaFX-based application, written in Kotlin. JavaFX runs in a separate thread by default, and I want to ensure that the variable that is initialized in the main thread is ready when JavaFX reaches the part where it uses that variable. Java has wait and notify methods that I'd use on that variable, but they aren't available in Kotlin. I also looked into Kotlin coroutines, but they seem to be built around task dependency (i.e. one task can wait for another), but they don't work so...

How to keep service running in background in Android O? I need to keep a service running in background. This service is used to keep a Socket.IO/MQTT connection. In versions previous to Android O there were no problem keeping the service alive, but in Android O this is not possible because of the background execution limits. Is there any way to keep the services running, besides foreground service?

Finding field annotations using obj::class.declaredMemberProperties In the following test, the field id of class TestData is marked with the annotation Foo. Why is the output of .annotations and .findAnnotation() empty though? How can check if a field is annotated by a certain annotation? (This is not the same question as How to list field annotations in Kotlin? where the asker forgot to change the retention to RUNTIME) import...

Dagger 2 - cannot be provided without an @Inject constructor or an @Provides-annotated method I have a problem with Dagger 2 dependency injection. I'm using it in Android project but in a java-library module and in unit testing. ApiTestModule.kt @Module class ApiTestModule { @Provides @Named("testDatasource") fun provideGithubTestDatasource(): GithubDatasourceImpl { return GithubDatasourceImpl(Mockito.mock(GithubService::class.java)) } } TestComponent.kt @Singleton @Component(modules = [ApiTestModule::class]) interface TestComponent { fun inject(test:...

How do you pass the MethodChannel Result to a new Activity? fellow Flutter enthusiasts, pros, and future friends. I've been really banging my head from trying to pass the MethodChannel.Result from the MainActivity to a new activity (to handle the result handler after performing some work there). In iOS, I've stuffed the FlutterResult into a struct with other pertinent values and passed that into a new ViewController, and have been successfully running the result handler from there. How do I go about doing so in Android? Since the result isn't...

Kotlin Error inflating class fragment I can not understand why Kotlin gives me this error: Error inflating class fragment it's a code in a very simple fragment MainActivityFragment import android.support.v4.app.Fragment import android.os.Bundle import android.view.LayoutInflater import android.view.View import android.view.ViewGroup import kotlinx.android.synthetic.main.fragment_main.* /** * A placeholder fragment containing a simple view. */ class MainActivityFragment : Fragment() { override fun onCreateView(inflater:...

How to read text in edittext in android kotlin [duplicate] This question already has an answer here: Convert String obtained from edittext to Integer in Kotlin language 2 answers I am getting text in edit text as string,but I want to get as integer. I used. Edittext.text.toString().toInt() Then app is not...

App Crash on pressing system back or menu buttons My app crashes whenever i press the back button or the menu button. I'm using androidx and kotlin. Below is my logcat 07-06 184725.538 22303-22303/com.mnkafe.mnkafe E/InputEventSender: Exception dispatching finished signal. 07-06 184725.538 22303-22303/com.mnkafe.mnkafe E/MessageQueue-JNI: Exception in MessageQueue callback: handleReceiveCallback 07-06 184725.558 22303-22303/com.mnkafe.mnkafe E/MessageQueue-JNI: java.lang.NoSuchMethodError: No static method...

Smart cast an Arrow-kt Option I am trying to smart cast an Option from any Any variable so that I can determine if the Option is empty however the IDE is indicating that Option could not be smart cast because it is declared in a different module. fun hasEmptyValue(column: Pair): Boolean = when { column.second is Option -> column.second.isEmpty() else -> false }

Kotlin aar andorid Library crash I am try to build aar library now for getting device information. It seems fine when I build library, but when I integrate my test app with my library i keep crash. This is my crash log. 07-07 024423.033 8021-8021/ruri.sdk_test E/AndroidRuntime: FATAL EXCEPTION: main Process: ruri.sdk_test, PID: 8021 java.lang.ClassCastException: java.lang.String cannot be cast to android.net.ConnectivityManager at jinuooki.com.peterworks.peterBrix$Companion.event(peterBrix.kt:43)...

android.view.InflateException: Binary XML file line #16: Binary XML file line #16: Error inflating class Button I got this error in my code. Please help me to fix this. android.view.InflateException: Binary XML file line #16: Binary XML file line #16: Error inflating class Button at android.view.LayoutInflater.inflate(LayoutInflater.java:543) at android.view.LayoutInflater.inflate(LayoutInflater.java:427) at com.kensai.kensaicashier.adapter.EditMenuAdapter.onCreateViewHolder(EditMenuAdapter.kt:14) at...

Kotlin libraries syntax not colored When I browse through libraries in my project the Kotlin ones are not syntax colored. For example Java: And here Kotlin: What is the setting I can change to color it as well?

button click event not working for button in TableLayout i have this button in a TableRow and I'm trying just to call onClick event like this fun QA3CLK(v: View) { Toast.makeText(this, "You clicked the button", Toast.LENGTH_SHORT).show() } also i tried this in onCreate val QA3 = findViewById(R.id.QA3) QA3.setOnClickListener{view -> Toast.makeText(applicationContext,"button clicked", Toast.LENGTH_LONG).show() } but not working!! nothing happened when i click the button, no error no Exception...