Kotlin: runOnUiThread Unresolved Reference I am attempting to use Activity.runOnUiThread(Runnable), but Android Studio seems to think that the function does not exist. I've made sure "android.app.Activity" is imported. I am trying to use threads to connect to a bluetooth device and read the data. I've listed the paired devices and clicking one of the paired devices brings me to a second screen where I can then connect/disconnect the socket from the selected device. Connecting and disconnecting is working. I'm now trying to send the...

Backend Internal error: Exception during code generation While I'm turning off internet connection on the phone I have an exception Cannot evaluate the expression: : Backend Internal error: Exception during code generation Cause: Can not generate outer receiver value for class When internet is on, everething works fine! StartViewModel.kt package andy.schedulekpi.ui.fragments.start import android.content.SharedPreferences import androidx.lifecycle.MutableLiveData import andy.schedulekpi.network.api.ApiFactory import...

How to get data from any asynchronous operation in android (Disclaimer: There's a ton of questions which arise from people asking about data being null/incorrect when using asynchronous operations through requests such as facebook,firebase, etc. My intentions for this question was to provide a simple answer for that problem to everyone starting out with asynchronous operations in android, as I couldn't really find an example of this after searching, feel free to send me a link if there is and I'll remove this) I'm trying to get data from one of my...

Kotlin delegation, what should I test? In Kotlin the powerful construct of delegation can be used to extend functionality of existing interfaces by reusing existing implementations. class Demo : Map by HashMap {} Questions: What should I be testing? Testing hashmap from the example is not the target of this test. It seems very verbose to verify the complete implementation, I would rather like to verify that the delegation of the proper fields take place. When using mutation testing, e.g. using <a href="http://pitest.org/"...

How to build a KStream from SubscriableChannel I'm working with Spring cloud streams and wanted to fiddle with KStreams/KTables a little. I'm looking for the methodology of going from a standard Kafka topic to turn it into a stream. I've done this in KSQL but I'm trying to figure out if there is a way to have SpringBoot handle this. The best I can find is examples where both @Input and @Output channels are already KStreams but I think that is not what I want. Kafka Setup Inside of SpringBoot I'm doing the following: My data comes...

OkHttp: NoSuchMethodError copyInto in TlsUtil Running instrumentation tests with RESTMock we are getting this error java.lang.NoSuchMethodError: No static method copyInto$default([Ljava/lang/Object;[Ljava/lang/Object;IIIILjava/lang/Object;)[Ljava/lang/Object; in class Lkotlin/collections/ArraysKt; or its super classes (declaration of 'kotlin.collections.ArraysKt' appears in /data/app/com.example.debug-1/base.apk) FATAL EXCEPTION: pool-6-thread-1 Process: com.example.debug, PID: 6606 java.lang.NoSuchMethodError: No static method...

How change upper-hint in MaterialDesign EditText? I use TextInputEditText and kotlin. I try to change hint programaticaly. But it changed just in box. Add when move-up when i wrote something - upper hint not showing. I use this code in onCreate: editTextChooseDate.hint = "Please choose the Date" and later I check if editTextChooseDate has some test and try to change hint by: editTextChooseDate.hint = "Selected Date" There is editTextChooseDate in xml: I expected to change upper-hint programaticaly.

Kotlin addproximity I can not show alert by proximity on the map, even without marker it sends the notification do not know if I'm using the right var can someone help me? FULL CODE: https://pastebin.com/3nKS66dJ private var markers: ArrayList = ArrayList() private var currentLocation: Location? = null private var allMarkersMap: HashMap = HashMap() private var markersRef: DatabaseReference? = null private var markerChildEventListener:...

change background Listview I want to change iTem ListView position 1 when i click button provious it s emergency

Avoiding Deadlock while running a three legged transaction In an accounting system, money can be transferred between accounts. To avoid deadlock while double booking transactions (Transfers between accounts) Transfer from account to account is based on id order: @Transactional override fun doubleBookPrepaid(eventId: Long, srcPurposefulAccountId: PurposefulAccountId, trgPurposefulAccountId: PurposefulAccountId, amount: Money): Pair? = if (srcPurposefulAccountId.accountId < trgPurposefulAccountId.accountId) { // Locking minimal account ID...

Filter a list of numbers by a list of numbers So I have a set of data where each object has a unique ID. And I also have a list of ID's that I want to filter out. So an easier example of what I'm trying to do is the following: How could i filter a list of numbers by another list? val list1 = listOf(1,2,3,4,5,6,7) val list2 = listOf(1,2,3) So say I wanted the list to filter list1 by list2. So that the remaining numbers are 4,5,6, and 7 in the new list. Thanks!

What is the web dependency in the Kotlin Spring Boot tutorial? In the Kotlin Spring Boot tutorial it asks you to include the web dependency, like this: but in the actual Spring Boot initializr, I don't see that: <a href="" rel="nofollow...

Why I cannot resize and position my dynamic dialog (with no XML associated)? I have studied many questions and answers in Stackoverflow, then I made a dummy function, that I run after a click in my app. It's the code: fun openDialog(cx: Context) { val alertDialog = Dialog(cx) var linLayout = LinearLayout(cx) linLayout.setOrientation(LinearLayout.VERTICAL); // Set width, height and weight linLayout.layoutParams = LinearLayout.LayoutParams(500,1000,1F) // top and left position linLayout.x = 0F linLayout.y = 0F val title...

Cannot get list to be loaded in android kotlin I have an issue trying to get the list view loaded. Here is the sample code that I'm using to load the list view. The SearchFragment calls the adaptor to load the data. The MainActivity calls the SearchFragment. activity_main.xml row_layout.xml search_layout.xml MainActivity.kt package sample import android.support.v7.app.AppCompatActivity import android.os.Bundle import android.support.v4.app.FragmentTransaction import...

Is it possible to store an instance of a Countdown Timer inside a Room database? I am just curious if a Countdown Timer can be stored in a room database. The reason is if the app crashes or closes, it can re-instantiate the timer and continue where it left off. I also would like to remove the instance when the time runs out. I figured I could do that with a query in the DAO.

using interface in kotlin i'm new with kotlin , i got one problem with interface in kotlin , there is my interface interface Products{ fun Succes(res:Product) fun Error(msg:String) } i used this interface in constructor of some function like this fun homeProducts(url: String, onRecived: Interfaces.Products){} i did set value in this function ( homeProduct ) and i know its working fine , but problem is i cant imp this interface inside function ServerCalls(this).homeProducts(url,onRecived = { //...

Calling 3rd party native library in your own android app Is it possible to write code for native libraries you do not have the source code for in your own android app? For example - RarLab's android app comes with a native library librarlab_rar.so for at least 4 different platforms. Assuming that I'm doing this for experimental and copyright isn't an issue and I don't plan to distribute the app externally, is it possible to compile a Java/Kotlin...

How to disable my Geofence BroadcastReceiver? I'm following Android's tutorial on defining a broadcast receiver for geofence transitions. The BroadcastReceiver works, but I'd like to disable it inside the broadcast onReceive() method. class GeofenceBroadcastReceiver : BroadcastReceiver() { override fun onReceive(context: Context?, intent: Intent?) { Log.d(TAG, "Received...

ApiException trying to authenticate user on firebase with google account I'm trying to authenticate my firebase app using the google account, but it's returning an exception every time, com.google.android.gms.common.api.ApiException: 12500: I added the web client credentials (Auto-created for Google Sign-in) in the provider configuration in firebase, but it didn't work. class LoginActivity : AppCompatActivity() { private lateinit var auth: FirebaseAuth private lateinit var googleSignInClient: GoogleSignInClient override fun...

How to properly handle cancellation in coroutine's computation code? Here is my understanding of cancellation in coroutine: If a parent coroutine is canceled, the children will stop too. If a child coroutine throws Exception, the sibling and parent coroutine will notice it and stop. Except for SupervisorJob, it will continue active even though one of the child coroutines is stopped. So, I write a code snippet to practice my understanding. Code Snippet 1 fun main() { val parentScope = CoroutineScope(SupervisorJob()) parentScope.launch...

Eclipse is not showing “Run as Kotlin Application” option. Only shows “Run Configurations” I've installed the Kotlin Plugin for eclipse and when i go to compile the code doesn't have the options to Run as Kotlin Application

Unresolved reference: viewModelScope I am tring to use viewModelScope.launch(Dispatchers.IO) in my android project android studio show the error "Unresolved reference: viewModelScope" I copy pasted the dependency from official site. I also tried to migrate to android x. I added the latest dependency from official sites also tried Invalide cache and restart yet did'nt work. My Module level gradle file dependencies dependencies { implementation fileTree(dir: 'libs', include: ['*.jar']) implementation...

D/BluetoothLeScanner: Stop Scan by itself every few seconds I'm developing an app that needs to function on new and older devices. This app needs to continuously scan for BLE advertisements. It is crucial that no advertisement is lost and crucial but less so, that the advertisement is received by the app the moment it is sent. On newer phones like my S10+, I don't see any issue. When disabling power optimizations, installing a ScanFilter and running a foreground service, the app has no problem continuously scanning in the background. However, when I...

How to open a closed Room Database I'm trying to implement a backup feature for my db. To do so, I have to first close the database, then upload the file. After successfully uploading the file, I have trouble re-opening the database. I'm using Room library. Here is my Database Code @Database( entities = [Activity::class, Entry::class, EntryActivityJoin::class], version = 1, exportSchema = false ) @TypeConverters(LocalDateConverter::class) abstract class MonkDatabase : RoomDatabase() { abstract fun...

How to get fileds inside the Any object I have JSON response like this

{
  "facilities": [
    {
      "facility_id": "1",
      "name": "Property Type",
      "options": [
        {
          "name": "Apartment",
          "icon": "apartment",
          "id": "1"
        }
      ]
    }
  ],
  "exclusions": [
    [
      {
        "facility_id": "1",
        "options_id": "4"
      },
      {
        "facility_id": "2",
        "options_id": "6"
      }
    ]
  ]
}

If i convert this to data class, i get List for...

Unsolved references using Kotlin in Android Studio New to programming and running into unsolved references in android studio Tried everything to my limited knowledge which isn't much https://imgur.com/a/SPkbPJc Thank you.

upload image to matrix server I am using matrix.org to upload attachment file when I do it from matrix server web the image payload is like this and when I upload it the file content is like I am using the following code to get my file content fun getContentOfImageFile(imageFile: File): String { return FileInputStream(imageFile).use { inputStream ->...

How to make an Android app (Kotlin) that sends user input to my e-mail address? I want to make an app (in Kotlin) for my company in which the user inputs his/her name, e-mail ID, and age and when s/he click submit, the data must be set to my e-mail ID, without opening the G-Mail or any other app.

different responseBody in retrofit with rxJava I'm new in rxjava and retrofit. I've developed my requests with rxjava and MVVM design pattern. I have a ViewModel class, which I write my requests as below : fun sendCode(phone:String){ val sendCodeDisposable = RetrofitClientInstance.getRetrofitInterface() .sendCode(phone) .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribe({ it-> sendCodeLiveData.value = it },{...

Is it possible to load a pre-populated database from local resource using sqldelight I have a relatively large db that may take 1 to 2 minutes to initialise, is it possible to load a pre-populated db when using sqldelight instead of initialising the db on app launch?