Kotlin fastest PDF generator what is the faster PDF generator for laravel? Can anyone please advice me on which pdf generator I can use, that can implement bootstrap?

Diffrence between getting resource via getResource() vs direct way [duplicate] This question already has an answer here: Difference between getString() and getResources.getString() 3 answers I was wondering what is the diffrence between 3 ways of reaching the resId in Kotlin if there is any. I was trying to find some simple answer but couldn't find...

Access inner class of superclass child I have the following abstract class: abstract class AbstractBook { abstract val type: String abstract val privateData: Any abstract val publicData: Any } and the following class which inherits the AbstactBook class: data class FantasyBook ( override val type: String = "FANTASY", override val privateData: FantasyBookPrivateData, override val publicData: FantasyBookPublicData ) : AbstractBook() And then there is this class which should include data from any type of...

How can a title of an article by the side in android I'm a begginer in Android and my teacher gave me the task to create this layout, I know how to create the layout that the subheading will be on the top but not on the side here's the code:

How to write annotation processors for kotlin/native? Is it possible to write our annotation processors in kotlin/ native or kotlin multiplatform modules? If so, then how? I found this tutorial for kotlin: https://github.com/osamarao/ViewModelAnnotationsKt But I am not sure how to implement the same in kotlin/ native.

FusedLocationProviderClient always returns false in onLocationAvailability callback on Sony Xperia Z2 FusedLocationProviderClient always returns false in onLocationAvailability callback on Sony Xperia Z2. Permissions are granted, location is enabled. In location preferences set up option to use wifi, network and gps. Everything works fine on emulator, Samsung, BQ, Nexus, Xiaomi. OS versions from 6 to 8. But on Sony (andorid 6.0.1) I have this problem. Any ideas ? I'm over Callback private val mUserLocationCallback = object : LocationCallback() { override fun...

Advantage of adding asSequence() in Array in Kotlin Anyone can help me pointing out the difference between the use of asSequence() in the following piece of code. val numbers = 1 .. 50 val output = numbers.asSequence().filter{ it < 10 }.map{ Pair("Kotlin", it)} output.forEach(::println) Adding asSequence() val numbers = 1 .. 50 val output = numbers.asSequence().filter{ it < 10 }.map{ Pair("Kotlin", it)} output.forEach(::println)

Conver the string of date and time into date string in kotlin I want to convert the datetime string like "2018-04-13T200000.0400" into "April 13,2018" . I have used the code val sdf = SimpleDateFormat("yyyy/mm/dd", Locale.getDefault()) val startDate = sdf.parse(data.start_time) but with this code my app crashes. Any help regarding this

Read information of the German EC/Giro Card through NFC in Android Does anybody know a way on how to read the data of a German Giro Card/EC Card through NFC? I have been trying it with EMV Card Readers, and somehow the succeed on reading the Card Number, but aren't able to read the bank Identification Code (BIC) / SWIFT. It would help me a lot since by combining the Card Number and BIC i can generate the IBAN.

Mongo updateOne with upsert false not working? I am buidling an application with Kotlin and MongoDb, using KMongo to create, read, update and delete documents. Everything is working fine except for the updateOne method. When trying to update a document with upsert set to false, it still updates the document by adding a new attribute. This my code: fun updateOneEmployee(id: String, newEmployee: String): UpdateResult { var options = UpdateOptions() options = options.upsert(false) return Collection.updateOne(Employee::id eq...

Kotlin: Expose composite class properties as public host class properties Say we have a Composite class class Composite(val one: Int, val two: Int) and a Host class class Host(val comp: Composite) Now we can print the properties of the Composite object fun hostTest() { val comp = Composite(2, 3) val hst = Host(comp) println(hst.comp.one) println(hst.comp.one) } Is it possible in Kotlin to expose the Composite properties as direct properties of the Host class? So, I want to write something like this: fun hostTest() { val comp =...

Cannot override Java function in Kotlin I am currently developing a BLE-enabled Android app targeting API 27 using Kotlin. I am attempting to override a function within android.bluetooth.BluetoothGatt. There are a number of callbacks available to be overridden to enable the handling of certain BLE events. For example, I override onConnectionStateChange() in the following way: private val bluetoothGattCallback = object : BluetoothGattCallback() { override fun onConnectionStateChange(gatt: BluetoothGatt, status: Int,...

Not able to remove RealmMigrationNeededException, changes to properties not being updated In the model class that I'm using along with Realm for an app, I accidentaly let the Price property be nullable, and the Image property was commented out. The Image property was commented out because it was of type: Data, and Realm does not support this. I was later suggested to use bytearrays for Data type properties. My model class looked like this initially: open class ProductModel : RealmModel { @PrimaryKey var Id: String? = null var Name: String? = null var Group:...

.kts script in a Grdale project I have a Kotlin Gradle project. If I create a .kts file it works anywhere except the /src/main/kotlin folder. IDEA highlights the whole file in red. Gradle throws out compilation exception. The exception is ...src/main/kotlin/test.kts: (3, 1): Cannot access script base class 'kotlin.script.templates.standard.ScriptTemplateWithArgs'. Check your module classpath for missing or conflicting dependencies`. What is the problem? My build.gradle: plugins { id 'org.jetbrains.kotlin.jvm'...

JavaFX: ObservableArrayList adding elements freezes application In my JavaFX application I try to set choicebox items (around 90 string items) like this: private fun initChoiceBox(choiceBox: ChoiceBox, elements: List) { val detectLabel = "Detect language" choiceBox.items = FXCollections.observableArrayList(detectLabel) choiceBox.selectionModel.selectFirst() choiceBox.items.addAll(elements) // hanging is here } The method above is called from javafx.concurrent.Task#onSucceeded: private fun initializeSelectLanguage() { val...

Cannot resolve corresponding JNI Function | Open CV | Android | Kotlin I've successfully compiled and able to run the app into the device, since I am getting this issue trying to use any JNIs function. Here is the error which I am stuck at -

Is it possible to hide certain corda nodes from others in the network? Is it possible to define the set of peers known/ seen to a node? I.e. In a network of 4 nodes (A,B,C,D) can A's peers be set to be only C & D and B's peers be set to C & D, whereas C and D can see all the nodes as normal. The goal would be to hide A from B in this case (and vice versa).

How to override hidden Java callback in Kotlin: Reflection I am using Android API 27 and Kotlin and wish to override a BLE callback that is hidden via @hide. This question follows on from a previous question of mine. The callback in question is onConnectionUpdated and is defined within <a href="https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/bluetooth/BluetoothGatt.java" rel="nofollow...

LiveData unit testing error when using postValue in init block I'm trying to write a unit test for a view model using live data. LoginViewModel.kt class LoginViewModel @Inject constructor( val context: Context ): ViewModel() { val username = MutableLiveData() val password = MutableLiveData() val isLoginButtonEnabled = MediatorLiveData().apply { fun combineLatest(): Boolean { return !(username.value.isNullOrEmpty() || password.value.isNullOrEmpty()) } addSource(username) { this.value = combineLatest()...

Static variable for state management I'm having trouble understanding the problem in this scenario. I have a class used for Analytics Tracking, lets call it FlurryTracker, it has 2 methods StartTrackingScreen(ScreenName) and StopTrackingScreen(). Now if I have a static var called screenName and each time start tracking screen is called screenName is reassigned. startTrackingScreen(activity: Activity, screen: DhTracker.Screen) { screenName = screen.getName() val lastScreen = Singleton.getLastScreen()...

Change value of SwitchPreference in Android I have a PreferenceFragmentCompat with switch preferences. One of the preferences requires a permission and I have figured out how to ask for the permission. My problem is that if I have to check for permission, the switch shouldn't change value until the permission result is received, but it does. So my question is, how do I change the value of the switch in such a case?

Kotlin Concurrency: mark a class as synchronized I have a class that handles HTTP request. There is no reason for this class to ever be used by multiple threads, so I'd like to make it fully synchronized. The reason I'm not simply letting this class be un-synchronized is because it contains multiple usages of the kind: if (jsonOutput != null) { // ... jsonOutput!!.writeTo(PrintWriter(writer)) // ... } Notice that I'm using the !! operator in a null-check, which should not be needed in Kotlin. The compiler forces me to add...

Android Kotlin - How to read NFC tag inside Activity I found some recent posts here about reading NFC Tags with Android. The conclusion that I got is that to performing an NFC read action triggers a separated intent. What I want to achieve is that only my current activity is reading the NDEF message from a NFC tag in text/plain format. So first question: Is it neccessary to list the intent-filter in my manifest? I think this is not neccessary since I do not want to launch my app via NFC tag event, right? Second question: How do I...

update firebase realtime database in specific period with kotlin I am writing Kotlin Android App with Firebase Realtime Database, and I want to update GPS data in specific period(10sec), not in real time. I tried both Timer() and Handler(), but the update time was not accurate, sometimes less than 10sec. I read this but it doesn't help. val myTimer = Timer() val task = object : TimerTask() { override fun run() { val...

Converting Java lambda to kotlin public static Function required = objects -> (Function) (wrapper) -> { if (LIVRUtils.isNoValue(wrapper.getValue())) { return "REQUIRED"; } return ""; }; How do I convert this Java8 lambda approach to Kotlin lambda?

MenuItem.SetOnActionExpandListener() with Kotlin Like basically everything with Kotlin Android Development, I am having trouble finding an example of how to utilize the MenuItem.SetOnActionExpandListener() in Kotlin. My menuItem is a search action, and I need to trigger a function whenever the user closes the search. However, when searching how to do all of this, the only examples I find are in Java with zero information about how to do it in Kotlin... I am attempting to use <a...

how to get data from object _field in firestore i need to get data from object (named "0") in a document in firestore, is that possible ? this is my code now: val db = FirebaseFirestore.getInstance() val docRef = db.collection("accessories") .document("brand0") docRef.get().addOnCompleteListener(OnCompleteListener { task -> if (task.isSuccessful) { val document = task.result val group = document.get("0") as...

Get JSON Results with Retrofit and RxJava 2 in Kotlin I am new in the Android/RX world and I am making an app which uses the TMDB API in Kotlin using MVVM architecture for practice. My Data model is: data class Credits ( val credits: MutableList) data class Details(@SerializedName("genres") val genres: MutableList, @SerializedName("overview") val overview: String, @SerializedName("credits") val credits: MutableList, @SerializedName("title") val title: String, @SerializedName("vote_average") val...

Null-Pointer Exception when trying to access an EditText from another activity in Kotlin in Kotlin I am trying to set the content of an EditText of my main activity from within the HandleResult method of a barcode scanning activity, and I get a NPE. I have read https://kotlinlang.org/docs/tutorials/android-plugin.html This is the barcode scanning activity import kotlinx.android.synthetic.main.activity_main.* ... override fun handleResult(rawResult: Result) {...

Can the performance of PagedList and RecyclerView interaction be improved? In my Android app i'm showing data in a RecyclerView using Room and the Paging library. My implementation is quite similar to the example in the AsyncPagedListDiffer docs. The flow is the following: Data is changed in the database A corresponding Observer passes the changes to the Adapter: myLiveData.observe(viewLifecycleOwner, Observer { myAdapter.submitList(it)...