How to customize Google Map API in Android (Kotlin ) , so that Navigation works offline? In Built feature of Google Map Offline mode. Navigation works offline just by simply setting up your route when you have a connection. How to customize Google Map API in Android (Kotlin ) to make it work Offline i.e. google map navigation should work when there is no internet connectivity? Please provide if any Git repository as an example for iOS and Android.

RecyclerView very slow to switch between BottomNavigationView tabs I am using BottomNavigationView with recyclerview and fragments. It works with some warning errors. When I load for the first time before displaying the data in the Recyclerview I get the message E / RecyclerView: No adapter attached; skipping layout after this the elements already load normally. When I change the tab (in BottomNavigationView) and return to the same tab it takes a while to load the elements and again the previous message is displayed. It takes a long time, it's as if...

LiveData not updating after database change on Worker I have a Worker that send some images to a server. When the Worker starts, I need to change my view status to "In progress" and when the Worker finish, I need to change my view status to "Finished". But, when I update the Room Database inside the Worker, my view can't understand that the database has changed and the LiveData is not notified. If I make the same call before the Worker starts, the LiveData understand the changes and updates my View. The problem that I have is that my view...

Localization don't show on device I have added string localisation according to the instructions found on Android Official Documents. But despite that when I run the app with the langauge & input set prioritising one of then non default languages that have been translated, it doesn't appear in that language on the app. I have tried 2 physical devices and a virtual one. I have added the correct files: <a...

My Firebase database isn't getting written to from my android kotlin app I am unable to write to my firebase database even when my "setValue" is called successfully from this kotlin code: class InsertActivity : AppCompatActivity() { // get the database reference private var firebaseDatabase: FirebaseDatabase? = null private var databaseReference: DatabaseReference? = null override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_insert) firebaseDatabase =...

How to modify list of objects that cointains a unique field in transaction? I have a list of objects that cointains field - order that is unique. Method is under @Transactional annotation. I want to make backend for a drag-and-drop (https://run.stackblitz.com/api/angular/v1?file=app%2Fcdk-drag-drop-sorting-example.ts) , but when i want to change orders i get exception: Duplicate entry... for key order_uniq. My steps for example (object 1 to...

Two arrayList in a RecyclerView How can I show both arrayList in the same recycleview In my activity DetPartido: val resultado = (response.body()!!.golesLocal)!! + (response.body()!!.golesVisitante)!! Rv_DetLocal.adapter = DetLocalAdapter(resultado!!) My adapter: class DetLocalAdapter(val det_partido: List): RecyclerView.Adapter() { private var context: Context? = null override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): DetallesViewHolder { val layoutInflate = LayoutInflater.from(parent.context)...

Why is Kotlins type inference failing when Javas isn't? Given the following code (which uses a dummy return but shows the issue): import com.github.roookeee.datus.api.Datus import com.github.roookeee.datus.api.Mapper import com.github.roookeee.datus.immutable.ConstructorParameter data class EntryDto(val id: Long?, val title: String, val content: String) data class EntryEntity(val id: Long? = null, val title: String, val content: String) { fun toDto(): EntryDto { val mapper: Mapper = Datus.forTypes(this.javaClass,...

Defining a Receiver Intent Filter with a String on Android (Kotlin) Using Xamarin.Android (C#), you can use a String to define an Android Intent Filter by creating an attribue on the class: [IntentFilter(new[] { "my-string" })] public class MyAwesomeReceiver : BroadcastReceiver And then register it in your activity like so: LocalBroadcastManager.GetInstance(this).RegisterReceiver(MyAwesomeReceiver, new IntentFilter("my-string")); And then send the broadcast like so: var intent = new Intent("my-string"); broadcaster.SendBroadcast(intent); However, it...

Kotlin coroutine doesn't seem to launch I have a service that has a flow similar to the snippet below. Here you can see: Vertx handler that launches a coroutine in httReqScope context that calls suspendHandler suspend function (1) inside suspendHandler depending on request param value one of two logic paths are invoked: (2) external service is called via another suspend function and await() is called on CompletableFuture (3) result is calculated and returned immediately without any "suspend" calls import...

One `onClickListener` for many buttons in kotlin? How to create one onClickListener for many buttons in kotlin, i know there is already a solutin for it in Java but how to do it in kotlin ?

Enable EditText in specific "when" statement I'm creating environment picker with hardcoded and custom fields. My EditText's is 'android:enabled="false"'. In 'Custom' I need to enable all of them for input, suddenly isEnabled() is not working. What do I need to add to enabled those EditText fields ? Manifest Base class with spinner options class DebugMenuActivity : AppCompatActivity(), AdapterView.OnItemSelectedListener { var environment_list = arrayOf( "Prod", "Custom", ) Spinner for filling EditText...

Kotlin - Generic Type Parameters Not Being Respected Consider the following example: import kotlin.reflect.KProperty1 infix fun KProperty1.test(value: R) = Unit data class Foo(val bar: Int) fun main() { Foo::bar test "Hello" } Given that test expects a value of type R, why in this context, where the property type is Int, does it allow me to pass a String?

Unable to connect to adb check the event log for possible issues verify that your localhost entry I want to run my app but they gives me this error don't know what to do

JDBC shows syntax error but the query runs just fine in HeidiSQL I'm using jasync for ktor to connect to mysql. All my queries run fine except this one query. It shows a syntax error even after remove parts of the query. Mysql is running and processes queries just fine. I run the same query in HeidiSQL and it returns just fine, no errors. USE ${city.getString("DbName")}; SELECT m.id AS meter_id, m.meter_num AS meter_number, IF( l.split = 0, m.route_id, CONCAT( CAST(m.route_id AS CHAR),...

Mockito UUID.randomUUID() kotlin how mockear a uuid.Random with mockito-core, i try val id = "493410b3-dd0b-4b78-97bf-289f50f6e74f"; val uuid = UUID.fromString(id) Mockito.`when`(UUID.randomUUID()).thenReturn(uuid) but the response is org.mockito.exceptions.misusing.MissingMethodInvocationException: when() requires an argument which has to be 'a method call on a mock'. For example: when(mock.getArticles()).thenReturn(articles); Also, this error might show up because: 1. you stub either of:...

When should I use Object type vs straight Kotlin file While working with Kotlin, I see you can define methods in a Kotlin file that has no class or object type (i.e. a file without class Test or object Test). I also see when you put methods into a Kotlin file without the class or object keywords, you need to import the method (i.e. import com.package.testMethod) to the file you want to use it. A little more context, I was trying to make some utility methods and started tinkering with both object and kotlin file with no class/object My question...

Kotlin - Retrofit receives json with an object, but the object always display as NULL using Coroutines Im working with Retrofit2 - Coroutines and recently im stuck iwith an issue that is weird. I have this Coroutine for User Authentication fun checkUserLoginCoRoutine(){ GlobalScope.launch(Dispatchers.Main) { val request = repository.signIn(userRequest) try { val response = CoroutineUtil().retryIO(times = 3) { request.await() } when(StatusCode(response.code()).description){ StatusCode.Status.OK -> {...

getActualMaximum function returns the non-existent value in kotlin I have the following code to get the last day of the month but what is strange is that returns 31 for the last day. On that month of the year there should be only 30 days. Therefore, when I tried to parse the string data, I get Caused by: java.text.ParseException: Unparseable date: "2020/6/31 000000" Some tips or example will be lovely. I would love to hear from you! val cal: Calendar = Calendar.getInstance().also { it.clear() it.set(Calendar.YEAR, 2020)...

How can I turn this into a lambda? Android studio is giving me a squiggly saying that I should/could turn this into a lambda. I'm just getting back into my android app and also happen to be a newbie to kotlin...and never was a java programmer. I come from the C#.Net and JavaScript side of things. popup.setOnMenuItemClickListener(object : PopupMenu.OnMenuItemClickListener { override fun onMenuItemClick(item: MenuItem): Boolean { if (item.itemId === R.id.action_vitals) {...

Listen for socket opening before sending back to the server I'm making an app that send me the device location, and notify if the device not moved for 15 minutes, so I wrote the below: import android.content.Context import androidx.lifecycle.MutableLiveData import org.java_websocket.client.WebSocketClient import org.java_websocket.handshake.ServerHandshake import java.lang.Exception import java.net.URI class SocketClient { val uri = URI("ws://10.0.2.2:8080/ws") val message = MutableLiveData() fun connectWebSocket(context: Context) {...

Is it possible to skip source map generation for inline functions in Kotlin JS? In a Kotlin JS project I have a logging class: class Log(val name:String) { inline fun info(message:(() -> String)){ console.log("Info[$name] : ${message()}") } } Which inlines nicely when compiled to javascript as: var log = new Log('TEST'); console.log('Info[' + log.name + '] : ' + 'Testing log lambdas!!!'); console.log('Info[' + log.name + '] : ' + 'So much testing!!!'); BUT the result source map still maps the Log.info file which causes the console to...

Block each Deferred&lt;String&gt; item. Suspend function not entirely consumed In the runBlocking function, I fetch user id with async and await, which blocks until String is returned. val userId = async { fetchUser("username@gmail.com") }.await() // blocking Then, I want to do the same for Deferred list. val defferedList: List = listOf( async { fetchUserData(userId) }, async { fetchWeather(1.12, 0.15) }, async { fetchUserExtraData(userId) } ) When I run any of the functions below I notice that all three Deferred items run concurrently despite adding...

Maintaining the state of fragment when navigating to other fragment using Navgation Architechture component In my project I have used Navigation component to navigate between fragments. But when I navigate from one fragment to other fragment the previous one fragment loose its state when coming back to it. For ex. I have fragment A and write something in its editText and then I navigate to other fragment B. But when I come back to my fragment A using backpress the editText in fragment A is empty. Is there a workaround or solution to this issue?

Save large amounts of data with Hibernate through a Spring CrudRepository I'm trying to use a Spring CrudRepository saveAll() on a large amount of data (Anywhere from 10,000 records to 100,000 records), but I'm experiencing slow performance up to 5 hours to save the records. Are there any suggestions to improve performance? I have a Spring app written in Kotlin and I'm using this Spring CrudRepository saveAll() on Entities to get them into an Azure SQL Server Database. I have already tried the following 1) Bumping up the jpa.properties.hibernate.jdbc.batch_size up...

lateinit property llMain(RecyclerView) has not been initialized I have Activity with searchItem and tabHost. TabHost have other activity. And I have a search function in the database that displays the result in another activity, which is located in the tabhost.But when you try to search, it gives an error: kotlin.UninitializedPropertyAccessException: lateinit property llMain has not been initialized. I understand that the error is that when a function is called, it goes into viewTab and tries to call llMain. But I can’t figure out how to fix this....

Populate recyclerview from json retrofit I'm new with Koltin and I'm looking for some help. I want to populate a recycler view from an API with retrofit. I have an adapter for the recycler view, my data structure class, and the clases to do the parse of the json. But the only thing I dont know is how to fill the recycler view. My adapter looks like others adapter, the parameters that I'm passing are the context and the data structure class: In this case is called listforRV Using live data: fun ListRV(): LiveData { if...

Getting "Suspension functions can be called only within coroutine body" when calling withContext(Dispatchers.Main) inside a lambda I am creating a coroutine using the script below: fun bar(completion: () -> Unit) { GlobalScope.launch(Dispatchers.IO) { val lambda = { withContext(Dispatchers.Main) { //Suspension functions can be called only within coroutine body completion() } } foo(lambda) } } fun foo(lambda: () -> Unit) { //...do something heavy lambda() } But I am getting the error Suspension functions can be called only within coroutine body when I call...

Can I listen to a document content that has not already been created? My requirement is the followin, I need to listen to a document value that has not yet been created. My use case is this, I launch a cloud function that writes to an specific path in my firestore database, then from android I attach a listener to that value that has not yet been created, and then when its created a launch the logic with the data that has been placed at the database. db.collection("home").document("homeTest/light_id").get().addOnCompleteListener {...

ViewGroup: Null Pointer Exception Whenever I try to inflate the container "ViewGroup" it faces a null pointer exception. Please me overcome the problem. import android.view.ViewGroup class NavigationDrawerAdapter(_contentList: ArrayList, _getImages: IntArray, _context: Context): RecyclerView.Adapter(){ ... override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): NavViewHolder { var itemView = LayoutInflater.from(parent?.context)...