Create a list from statements in a DSL block In an attempt to build a DSL for validation, I am looking for ways to collect the statements inside a block/lambda with receiver. To illustrate, here is a minimal example without the actual validation logic: data class Constraint(val hint: String) class Validation(val constraints: List) { companion object { operator fun invoke(init: (ValidationBuilder.() -> Unit)): Validation { return ValidationBuilder().apply(init).build() } } class...

Api making in java(or kotlin) (android) I am trying to make a normal api for a local network from the android phone.I know flask but since it is in python so I searched for other alternatives so I tried using JFlask,but error occured while executing the code startServer.setOnClickListener { try { val app = App(Integer.getInteger("port", 8080)) app.scan(object : Any() { @Route("/hello/:name") fun hello(name: String):...

Issues to pass objects as parameters from activity to fragment I am trying to pass an object as a parameter from an activity to a fragment. I already searched over hill and dale to find out how to do it, I tried many methods but none of them worked. Here is what I tried : // In my Activity, where I call my fragment var bundle = Bundle() bundle.putParcelable("restaurant", restaurant) var fragment = Home2Fragment() fragment.arguments = bundle supportFragmentManager.beginTransaction().replace(R.id.content, fragment, FRAGMENT_HOME).commit() My IDE...

ExpandableList hardcoded to Firebase-Firestore So, I have been working with FireabseFiresotre on my app and I have lists and such that load my firestore collections and documents properly. On one of my activities I need an expandable list so I did a tutorial on youtube to get one, since it's nowhere near as easy as implementing a list view. On the tutorial, of course hardcoded data is used. Could anyone point out what I have to change to use Firestore data instead? I don't want a solution just pointers, since I tried some things and...

Error:Execution failed for task ':app:compileDevDebugJavaWithJavac'. > app: Original kapt is deprecated I have changed Kotlin version to 1.2.30. After the update I unable to run the project. I got the below error message. Error:Execution failed for task 'appcompileDevDebugJavaWithJavac'.

app: Original kapt is deprecated. Please add "apply plugin: 'kotlin-kapt'" to your build.gradle.

How to Resolve this.

kotlin coroutines. Difference between launch{ fun} and launch {suspend fun} Is there any difference in execution between? launch { function1() } fun function1(){ DoSomething... } And launch { function2() } suspend fun function2(){ DoSomething... }

Kotlin filterNotNull for object properties I have the following (simplified) kotlin code: data class Event(val name: String, val venue: Venue?) data class Venue(val lat: Double, val lng: Double) ... return events .filter { it.venue != null } .map { doSomething(it.venue.lat, it.venue.lng) The code doesn't compile with the error Only safe (?.) or non-null asserted (!!.) calls are allowed on a nullable receiver of type Venue? I understand what this means, but I don't understand why the compiler can't figure out...

Kotlin with BrainTree in android - java.lang.IllegalAccessError: Illegal class access: I am using Kotlin in android and that is when trouble started occuring. when i originally had the final as java it was ok. Here is the error i am facing: FATAL EXCEPTION: main Process: com.mobile.myapp.labs, PID: 27804 java.lang.IllegalAccessError: Illegal class access: 'com.mobile.myapp.gateway.paymenttypes.PayByBrainTreeCCPaymentStrategy' attempting to access 'com.braintreepayments.api.Braintree$Listener' (declaration of...

Android WebView Kotlin - fix zoom/position webView content to all, I have a problem when trying to set fix zoom on WebView Content in Kotlin. Downstair I was put my code: private fun setWebView() { rcptCls.settings.loadWithOverviewMode = true rcptCls.settings.useWideViewPort = true rcptCls.settings.builtInZoomControls = true rcptCls.setInitialScale(1) // needed to disable clicking to number leads to phone call rcptCls!!.webViewClient = object : WebViewClient() { override fun shouldOverrideUrlLoading(view: WebView,...

Android Bitmap from inputStream flickering After getting images from individual urls and displaying them in the list. They flicker through all of the images that were gathered when the list is scrolled. This sometimes results in images being in the wrong list row. Here is an example of the problem - https://gfycat.com/AbleRectangularKookaburra Here is the code i use to get and set the images: if (TVBasic.posterPath!= null){...

Can't remove Fragment from TabLayout I have TabLayout with ViewPager On click close button, i try remove tab closeIcon.setOnClickListener { tabLayout.removeTabAt(pos) fragments.removeAt(pos) fragmentsTitle.removeAt(pos) notifyDataSetChanged() } Adapter code: class ViewPagerAdapter(fm: FragmentManager, private val tabLayout: TabLayout, private val ctx: Context) : FragmentStatePagerAdapter(fm) { private val fragments = ArrayList() private val fragmentsTitle = ArrayList()...

Firebase database setValue works only locally I implemented google login and set rules in database as: { "rules": { "users": { "$uid": { ".write": "$uid === auth.uid", ".read": "$uid === auth.uid" } } } } When I login to just installed app and try to save value it works great. Then after leaving app for an hour or so the new values seem to be stored only locally and never get updated in the cloud database. I can also see it if I login as the same user on another phone - the local databases are...

detached entity passed to persist Kotlin When I try to persist an entity, the following error occur org.hibernate.PersistentObjectException: detached entity passed to persist: xxxxxxx.xxxxxxxx.Invoice My model @Entity @Table(name = "invoices") class Invoice( @Id @GeneratedValue(strategy = GenerationType.IDENTITY) var id: Long = -1, var date: Date, @Column(name = "user_id", unique = true) var userId: Long, @Column(name = "invoice_number") var invoiceNumber:...

Kotlin custom annotation parameters I'm trying to create a custom annotation with an array of arguments but I get an error when trying to set the arguments in the constructor of the annotation. It says it is expecting a type annotation on the Role[], while, if i'm right the Role[] is the type. I looked up the syntax in the docs which can be found here: https://kotlinlang.org/docs/reference/annotations.html. But this documentation only...

Kotlin Jsoup Android async I can't get Jsoup to work with Kotlin. I can't scrape any website. Here is my function that prints the result: fun testing(view: TextView?) { async(UI) { val data: Deferred = bg { KotScrape().getWebsite() } view?.text = data.await() } } And my KotScrape class: class KotScrape{ fun getWebsite(): String{ var title = "Test" var html =...

Saving Wifi Data Locally To Phone I'm developing an android wifi localization app that uses a grid approach, where you select a grid tile and then it scans and collects all of the BSSIDs and RSSI values nearby that point and saves them along with the x,y coordinate of that grid tile. What would be the best way to save that data? Should I use an sql database or would creating a text file be better? This is a rough sketch of the data I need to save. RadioMap: { “filename”: String, “points(list)”: { “x”: Int,...

Using JWT with Ktor and including user info in claim I've successfully included a jwt auth token in my application and able to restrict access to the endpoints. I want to embed the user's ID in the jwt token, but I'm struggling how to implement the jwt verifier in Ktor. I create a token for the client something like this: val token = JWT.create().withAudience(audience).withIssuer(issuer).withClaim("userId", "XXX").sign(algorithm) The route is setup like this. The authentication {} block is run on server startup and does not allow creating...

Scanning For Wifi Within Custom View I have an android app that has a custom view that draws a grid. The custom view is only a section of the main activity's xml file. I need to be able to scan for wifi based on an associated grid tile (x,y) that the user selects. I'm able to get the correct grid tile using the onTouchEvent method in the custom view but I don't know how to get that information back to the main activity that contains the view so I can relate a wifi scan with the onTouchEvent and with the x,y tile that was...

java.lang.NumberFormatException type casting in kotlin I want to do body mass index and it's pretty simple. but I could not do that. I get an error in type conversions, but I did not fix the problem. Hatam java.lang.NumberFormatException: Invalid int: "android.support.v7.widget.AppCompatTextView. I guess the result = (kiloText.toString (). ToInt ()) / ((boy.toString (). ToInt () boy.tostring (). toınt ())). todoubl a ()   this code has type conversion error how can i do this? MainActivity.kt class MainActivity : AppCompatActivity() { lateinit...

Android App crashed when I update the version of support-v4 and appcompat-v7 from 24.2.1 to 27.1.0 When I had not add android proguard configuration for the v7 support library, my app crashed with these: java.lang.AbstractMethodError: abstract method "android.view.View android.view.LayoutInflater$Factory2.onCreateView(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet)" at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:725) at android.view.LayoutInflater.inflate(LayoutInflater.java:482) at...

Get High Accuracy Location on Android using fused location I tried to get current user location on button press and show the address on screen. I am using google fused location as follow locationClient = LocationServices.getFusedLocationProviderClient(this) locationRequest = LocationRequest() locationRequest.priority = LocationRequest.PRIORITY_HIGH_ACCURACY locationClient.requestLocationUpdates(locationRequest, callback, null) and after I get the latitude and longitude, i resolve the address using geocoder as follow addresses =...

Specific element at position 1 is duplicating fun appendMessage(message: Message) { val pos = mMessageList.indexOfLast { message.createdAtTime!! < it.createdAtTime!! } mMessageList.add(pos, message) notifyItemRangeInserted(pos, 1) } This is the code which I am using to append a message to a mutable list based on time. The problem is that one specific message is duplicating every time I append the message. This message is the first of its viewType in the list. I know I have done small mistake, but unable to find...

Selected item not showing in spinner kotlin Below is xml declaration of spinner: Below is initialization in activity class: var adapterReasons: LeaveReasonSpinnerAdapter ?= null adapterReasons = LeaveReasonSpinnerAdapter(this, R.layout.row_reason_spinner_item, reasonList) spnReasonActApplyLeave.adapter = adapterReasons Below is row_reason_spinner_item xml file: Below is LeaveReasonSpinnerAdapter class: public class LeaveReasonSpinnerAdapter extends ArrayAdapter { private final LayoutInflater...

Fragment inside a viewpager doesnt show when is in recyclerview Maybe this is a stupid question, but this is ruining my day... I have a recyclerview in a fragment override fun setUpRecyclerView(pics: List) { recyclerView.setHasFixedSize(true) layoutManager = LinearLayoutManager(context) recyclerView.setLayoutManager(layoutManager) mAdapter = NewsAdapter(pics, childFragmentManager) recyclerView.setAdapter(mAdapter) } the NewsAdapter is: class NewsAdapter (private val mDataset: List, private val fragmentManager:...

(Reflection) Implicit and explicit lambda declaration I am trying to understand the reflection. I have the following code: fun main(args: Array) { println(lengthL1()) println(lengthL2(s)) println(lengthL1.get()) // Error println(lengthL2.get(s)) // Error println(lengthNL1.get()) println(lengthNL2.get(s)) println(lengthNL1()) println(lengthNL2(s)) } val s = “1234” val lengthL1: () -> Int = s::length val lengthL2: (String) -> Int = String::length val lengthNL1 = s::length val lengthNL2 = String::length Why I cannot call the get (See...

Mock object in Android Unit test with kotlin - any() gives null I'm trying to test my classes and I need to mock a static class. My code is the following:- PowerMockito.mockStatic(ToolTipUtil::class.java) PowerMockito.`when`(ToolTipUtil.wasToolTipShown(any(Context::class.java), "")).thenReturn(true) val context = mock(Context::class.java) presenter.onResume(context) verify(view).setMenuButtonShown(eq(false)) But in the second line it throws an error: "java.lang.IllegalStateException: any(Context::class.java) must not be null"...

Android: Setting new text on old toast and renew duration I have a simple app with a button and click listener on it which displays a toast with the number of clicks that have been performed on the button: class MainActivity : AppCompatActivity() { private val toast by lazy { Toast.makeText(this, "", LENGTH_LONG) } var count = 0 override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) button.setOnClickListener { updateToast() } }...

How to call many restful web service call in onCreate() and show data to different UI in android hi friends i have many web service (Restful) api call on my activity. i want to call this api at a time set data to different ui in android. please send me example if any one tried that kind of called.

updating object with spring data mongodb and kotlin is not working I have the following request handler fun x(req: ServerRequest) = req.toMono() .flatMap { ... val oldest = myRepository.findOldest(...) // this is the object I want to modify ... val v= anotherMongoReactiveRepository.save(Y(...)) // this saves successfully myRepository.save(oldest.copy( remaining = (oldest.remaining - 1) )) // this is not saved ok().body(...) } and the following mongodb reactive repository...

ValueEventListener is assigned to the right path but is it not reading the value of the child node, though returns the right key I am making an attendance application for my college, where in to redirect user to their correct home activity based on what role they carry. To do the same, I have made 3 service classes, User-Role-Service, Faculty-Data-Service and Student-Data-Service. In, User-Role-Service singleton, it is reading the role of the user using it's 'uid' from firebase database. And according to the value returned it calls the function in Faculty-Data-Service or Student-Data-Service singleton to store user...