What is the difference between Java static method and Kotlin companion object ? Why it is giving error in Andorid Data Binding? Hi Guys I have one scenario, where I am working with Android data binding . I am trying to bind one small util method to the view as bellow //Java Code public class Util { public static String capitalize(String text) { return text.toUpperCase(); } } And Xml Layout code as bellow //layout.xml--Android ... It is woking fine, but when I am converting the Java class to kotlin as class Util { companion object...

View is null inside custom Dialog Android Kotlin I created custom Dialog in kotlin class.Here is a my code class SPCalendarDialog(context: Context) :Dialog (context,R.style.DialogTheme){ private var listener: OnSPCalendarListener? = null private var year: Int = 0 private var month: Int = 0 private var dayOfMonth: Int = 0 override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setCancelable(true) setCanceledOnTouchOutside(true) setContentView(R.layout.sp_calendar_dialog) val calendar =...

How to filter a specific SSID from scan result in android? I am new in android development and I am working on an application that scan for all available WI-FI and then show them in a list and its working fine here is the code: private var wifiManager: WifiManager? = null private val arrayList = ArrayList() private var adapter: ArrayAdapter? = null private var wifiReceiver: BroadcastReceiver = object : BroadcastReceiver() { override fun onReceive(context: Context, intent: Intent) { val results = wifiManager!!.scanResults...

MongoDB reactive template transactions I've been using mongodb for my open source project for more than a year now and recently I decided to try out the transactions. After writing some tests for methods that use transactions I figured out that they throw some strange exceptions and I can't figure out what is the problem. So I have a <a href="https://github.com/K1rakishou/photoexchange-backend/blob/master/src/main/kotlin/com/kirakishou/photoexchange/database/repository/PhotoInfoRepository.kt#L328" rel="nofollow...

Kotlin alertdialog. Im new at android programming and need some light im having trouble trying to show an dialog message who confirms the user logout, the greater issue is that im using menu drawner and it calls a fragment but i dont know how to show an dialog message on fragments. i have been trying this: import android.os.Bundle import android.support.v4.app.Fragment import android.view.LayoutInflater import android.view.View import android.view.ViewGroup import android.support.v7.app.AlertDialog class LogoutFragment : Fragment(){ override fun...

How to mock Android Lifecycle components? I am trying to build an Android app following the recommended design structure. Let's say, there is a UserRepository for handling the users. However, I would like to have certain settings in the app, for example "Show profile picture", "Sort by", etc. I would like to store these settings in a Room database, just like the Users. According to my understanding, the cleanest way is to have a separate...

Didn't find class "com.example.android.App" on path: DexPathList on Android 4 I have Kotlin MultiDex application using Dagger 2 for DI. Everything almost fine, but I have device with API 17 (Android 4.2.2), and sometimes application crashes immediately after launch with exception java.lang.RuntimeException: Unable to instantiate application com.example.android.App: java.lang.ClassNotFoundException: Didn't find class "com.example.android.App" on path: DexPathList[[zip file...

How to create a default body for a Retrofit call directly in the interface? I would like to add a default body to a single Retrofit call inside the interface I made. Let's say I have a Retrofit interface such as: import retrofit2.Call import retrofit2.http.* interface ExampleAPI { @POST fun makeRequest(): Call } And I would like to add a default body to the request with fields such as: param_one: j32n4n4jt param_two: k23n45k43t I am aware I can wrap the generated function and inject the body via: import retrofit2.Call import retrofit2.http.*...

Custom typeface not initialising in fragment I'm trying to use a custom typeface for a TextView in a LinearLayout that I created programmatically, but it's not working. I tried both FontManager.getTypeface(activity!!.baseContext, FontManager.FONTAWESOME) and FontManager.getTypeface(activity!!.applicationContext, FontManager.FONTAWESOME) but neither of these worked. Any idea on what's gone wrong and how to fix this issue? FontManager object object FontManager { private const val ROOT = "fonts/" internal const val FONTAWESOME =...

How to join a Kotlin SupervisorJob I am trying to process a tree of data objects. Each tree leaf is supposed to be processed through a function using a coroutine. The whole process should be done using a fixed size threadpool. So I came up with this: val node = RootNode() val localDispatcher = newFixedThreadPoolContext(16) fun main() { val job = SupervisorJob() val scope = CoroutineScope(localDispatcher + job) handleEntry(node, scope) runBlocking { job.join() } } The handleEntry method...

IntelliJ IDEA removing the character after on reformatting code IntelliJ removes the character after while reformatting. For example if I misspelled "Father" as "Fathr" and want to add an "e" afterwards, the editor removes the "r" on adding "e". I'm new to Kotlin and would really appreciate some help.

kapt3 build generated errors this is how my gradle looks //Dagger DI implementation 'com.google.daggerdagger2.10' kapt 'com.google.daggerdagger compiler2.10' compileOnly 'org.glassfishjavax.annotation10.0-b28' //Retrofit & OkHttp implementation 'io.reactivex.rxjava2rxandroid2.0.2' implementation 'io.reactivex.rxjava2rxjava2.1.12' implementation 'com.f2prateek.rx.receiversrx receivers0.1.0' implementation...

why recyclerview doesn't work on android pie? I have one problem. After update build.gradle to Android Support Revision 28.0.0 recyclerview does not load on android 9 emulator. same happens on physical device. on previous versions works fine. Then I have tried to migrate with android x, but nothing has changed. I used debugger to find if gradle gets into the recyclerview adapter but it does not. here is my build. gradle file: apply plugin: 'com.android.application' android { compileSdkVersion 28 buildToolsVersion '28.0.3'...

How to chain calls, depending on result, when the second call is a recursive method? I am working with java rx version 1.2.10 In my Api, I have to chain two async calls : The first call gives me items The second call gives me the subItems from these item, but if the subItems have more "subItems" I have to call recursively the second method and add the respective subItems. In my code, I wrote something like for the firts call : override fun getSportList(dCSServiceContext: DCSServiceContext): Single { return dCSService.get(dCSServiceContext).flatMap { item ->...

How to use sass/scss in create-react-kotlin-app I'm trying use scss in a kotlin-react application using create-react-kotlin-app in node for easy bootstrapping, but I'm stuck with setting the configuration to make it work I already ejected, so I can manually edit the webpack config. I already added the following to dev config and the corresponding equivalent to prod. { test: /\.scss$/, use: [ require.resolve('style-loader'), { loader: require.resolve('sass-loader'), options: { importLoaders:...

Adding path to base url in Spring Rest Docs? I have following configuration to use with Rest Docs: webTestClient = buildWebClient().mutate() .filter(documentationConfiguration(restDocumentation)) .baseUrl("https://api.my-domain.com/") .build() In my case I use path prefix to my service - service/foo Is there a way to insert such prefix without modifying production code?

property getter or setter expected in Kotlin ViewModel class I have following ViewModel class : class PersonViewModel( context: Application, private val dataSource: MoviesRemoteDataSource) : AndroidViewModel(context) { internal val compositeDisposable = CompositeDisposable() val person: ObservableField() private val isVisible = ObservableBoolean(false) fun showPerson(personId: String) { val personSubscription = dataSource.getPerson(personId) .subscribeOn(Schedulers.io())...

How to subscribe an observable who needs another hot subscription - RxJava I need to subscribe to an observable who needs another observable to subscribe. Something like: val someSingle = Single.create{singleEmmiter -> dataStream.subscribe {elementInDataStream-> if(elementInDataStream == "somethingiwant"){ . . . val someresponse = //someCode singleEmmiter.onSuccess(someResponse) } } } I have to something like that because in the dataStream...

How to change AppBarLayout content based on Navigation library destination I need to change my AppBarLayout based on Navigation component destination for example I have FragmentA and FragmentB I want when user go to FragmentA add TabLayout to AppBarLayout like YouTube application I have tried to add TabLayout to the activity and hide/show it based on navigation destination, But I found it useless because I need to access Activity and after that I need to findViewById and set ViewPager but I need to do that with new android Navigation component and clean code...

notifyDatasetChanged() is not working in koitlin notifyDatasetChanged() is not working, But instead of notifydatasetChanged(), if i pass the eventList with data to adapter directly after initialising recycler view list loads fine. How to resolve this ActEvents.kt class ActEvents : AppCompatActivity(){ // Initializing an empty ArrayList to be filled with animals var eventList: MutableList = ArrayList() @set:Inject var retrofit: Retrofit? = null private lateinit var personDisposable: Disposable /*******************...

I want to draw arc with color filled with animated gradient I'm drawing multiple arcs on canvas in a circular way, It's like speedometer(but not speedometer) , arc color changed with gradient color when speed reaches to high or low or average, But I want that, gradient color should be changed with animation, like if arc is in black color, when speed becomes high, arc should be changed to red gradient with smooth gradient animation. I have wasted my lots of time. please help me to solve it out. Thanks in advance.

Kotlin API Call Returns Null Object I am new to Kotlin and I am accessing the [an open API] (ttps://data.gov.sg/dataset/realtime-weather-readings). The code successfully executes, just returns a null object. Data Structure object WeatherObject { data class WeatherResponse(val data: WeatherData) data class WeatherData( val api_info: Status, val metadata: MetaData, val items: Items ) data class Status( val status: String ) data class MetaData( val stations: List, val reading_type: String,...

Add condition for limitation of joinToString in Kotlin I have a list of string like this: val texts = listOf("It is a", "long established fact that a reader will be distracted,", "by the readable content of a page when looking at its layout.", "The point of using Lorem Ipsum is that it has a more-or-less normal", "distribution of letters, as opposed to using, making it look like readable English.", " Many desktop publishing packages and web page,",...

How do i prevent playing multiple songs at the same time in my music player app? I am trying to build a music player app and I face problem when I try to play another song when a song is already playing. I want my app to stop playing the already running song and start the new song. I fetch the details of songs as a bundle from the adapter class into my songPlayingFragment. I tried implementing pause(),stop(),and release() methods. But none of them worked. I believed that I implemented them in the wrong section of code. This is my code without implementing any of the...

Build swing program using gradle with kotlin plugin, need -include-runtime How to put -include-runtime in build.gradle for kotlin swing program. Background: - buntu 18.04 64-bit - OpenJDK 11.0.1 - kotlin 1.3.10 - gradle 5.0 - Swing example borrowed from http://zetcode.com/kotlin/swing/ Compile: kotlinc KotlinSwingSimpleEx.kt -include-runtime -d swing.jar Run and Worked: java -jar swing.jar Run and Worked: kotlin -classpath swing.jar com.zetcode.KotlinSwingSimpleExKt However, the followings not work: "gradle build" or "gradle compileKotlin" Run, but...

Kotlin ktor UDP server + docker issues I have Ktor-based ultra-simple udp server: fun main() = runBlocking { val server = aSocket(ActorSelectorManager(Dispatchers.IO)) .udp() .bind(InetSocketAddress("localhost",9090)) while (true) { println(server.incoming.receive().packet.readText()) } } And I don't have problems with it on host/my-pc, but it just not working on docker. It's running, but it don`t receive UDP-packets. That's my Dockerfile:...

How to implement onItemClick and onLongItemClick in RecycleView for kaitlin in android I have used Kotlin for implementing click listeners How to properly use it, currently click is not detecting class AdptEvents (val items: MutableList, val context: Context) : RecyclerView.Adapter() { override fun onCreateViewHolder(parent: ViewGroup, p1: Int): ViewHolder { return ViewHolder(LayoutInflater.from(context).inflate(R.layout.row_event, parent, false)) } override fun getItemCount(): Int { return items.size }...

I have two WhatsApp accounts on same device and want my App to open the two accounts when try to share text I have two WhatsApp accounts on same device and want my App to open the two accounts when try to share text, what I change in the following code to do that ? val waIntent = Intent(Intent.ACTION_SEND) waIntent.type = "text/plain" waIntent.

package

= "com.whatsapp" waIntent.putExtra(android.content.Intent.EXTRA_TEXT, redirectUrl) startActivity(Intent.createChooser(waIntent, "Share with"))

RecyclerView not showing data from firebase (Kotlin) can anyone help me? i try lesson online for android-firebase, but it an old one. So the code change already. I got stuck at "onBindViewHolder" and "onCreateViewHolder" because the lesson don't have that. class UsersAdapter(databaseQuery: DatabaseReference, var context: Context): FirebaseRecyclerAdapter( FirebaseRecyclerOptions.Builder().setQuery(databaseQuery, Users::class.java).build() ) { override fun onBindViewHolder(holder: ViewHolder, position: Int, model: Users)...

PreferenceFragmentCompat won't change color when change theme and recreate activity I'm using PreferenceFragmentCompat for preferences and when I change theme preference using ListPreference to a dark theme and recreate activity text stays dark and becomes not visible. If I reopen this fragment text becomes white, but it returns to black color on orientation change Here is my styles: @color/colorPrimary @color/colorPrimaryDark @color/colorAccent @style/preferenceLight true false true @color/primaryText @color/secondaryText...