Check if String contains only letters in Kotlin How i can make a function that take a string and return the result weather the string contain alphabet letter only or not

Android Google Search Bar with Drawer My app is currently implemented with the Single activity approach (Using navigation architecture component with one main activity and several fragments). I am currently using a toolbar with a drawer. My app currently look like this: However in the modern google apps (Google photos, gmail etc..), Google has implemented a new way of navigating using a search field with an implemented drawer in it as shown below:...

Method implementation does not exist in the classes.dex file Description I have a class (AppManifest) with a property (appId) in module1 that another module uses that property. But after compilation and generation of getAppId, the method code does not exist in classes.dex file in the APK. Error (Normally, Show Bytecode is selectable) The method getAppId is generated getter of a kotlin property. Module1: class AppManifest { lateinit var appId: String ... }...

RecyclerView displays only one TYPE of items I have a RecyclerView in which I want to combaine two types of items: headers and paragraphs. When I open my Fragment, it displays either only headers or only paragraphs with random chance, but not both of this types. My headers and paragraphs are children of ArticlePiece class. Variable articlePieces always contains all elements I need. class ArticleContentAdapter( context: Context ) : RecyclerView.Adapter() { companion object { private const val headerType = 1...

How to exclude source fields in search APIs? Elasticsearch Java High Level REST Client's GET API provides a way to control which fields of the _source are fetched. val request = GetRequest(index) .id(id) .fetchSourceContext(FetchSourceContext(true,...

How to parse and modify build.gradle.kts Kotlin Gradle build script? I want to parse a build.gradle.kts (Gradle build script in Kotlin), so I can find out what values are currently set and I also want to modify or add new entries in some categories. Example (build.gradle.kts): import org.jetbrains.kotlin.gradle.tasks.KotlinCompile plugins { id("org.springframework.boot") version "2.2.6.RELEASE" kotlin("jvm") version "1.3.71" etc... } group = "net.myProject" version = "1.0" java.sourceCompatibility = JavaVersion.VERSION_11 val developmentOnly...

How to backup Android app related data like images, videos and files to Google drive I am developing an Note-Taking Android app using kotlin and I am a beginner. In my app I wanted to provide a feature to backup users data like notes, images and videos to their own Google drive. And also import the same. I don't know how to do that. Can anyone suggest how to implement this feature.

Kotlin fallback wrapper I'm looking for an elegant solution to the following. I'd like to implement a Wrapper class that: Accepts 2 implementations of the same Interface, and returns a new instance of that same Interface. Any method call to the Wrapper object, tries to call the same method on the 1st implementation. If the first call results into UnsupportedOperationException, then the 2th implementation should be used instead. interface API { fun getData(): String } class Main: API { override fun...

GLTF Model not rendering using reusable class I am trying to load a .gltf model remotely using Sceneform by using a reusable class and then creating an instance of the class in MainActivity and calling loadModel() method ModelLoader.kt import android.app.Activity import android.app.AlertDialog import android.net.Uri import android.util.Log import androidx.appcompat.app.AppCompatActivity import com.google.ar.core.Anchor import com.google.ar.sceneform.AnchorNode import com.google.ar.sceneform.assets.RenderableSource import...

How to use retrofit and its related libraries in android application? I am a beginner in app development in kotlin and currently trying to understand retrofit and its related libraries and how to integrate them in projects. I couldn't find a single site where they taught how to add retrofit libraries most of them where like copy and paste the following code type. So is there any way to learn how to use such libraries?

after cancel subscription ... in app features still unlocked my app is free but offers paid feature after users subscribe after a free trial but once they cancel the subscribtion they still get access to that paid feature i guess i'm doing something wrong ... here is my code (paymentactivity) `class PaymentActivity : AppCompatActivity() , BillingProcessor.IBillingHandler { private lateinit var bp : BillingProcessor private val tag = "PaymentActivity.kt" override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState)...

Do Room queries happen asynchronously? Are Room Database queries async? And if so, for lack of a better term, is something like this async/race condition safe? fun insertThingAsync(thing: Thing) = async(Dispatchers.IO) { try { dao.deleteAllThings() dao.insertThing(thing) } catch (e: Throwable) { // Stuff } } In other words, is it possible, in this case, for the dao to attempt to insert...

RecyclerView in a Dialog Defilly I'm sure that I don't have truth with RecyclerView in this project haha The idea of my project is to click in one recyclerView in MainActivity and after one dialog with other recyclerView is opened. The error is that my recyclerView isn't updating in a Dialog MainActivity: private fun openDialog(postModel: PostModel){ CommentDialogFragment(postModel).show(supportFragmentManager, "dialog") } CommentDialogFragment: class CommentDialogFragment(postSelected: PostModel):...

How to open settings menu in navigation drawer by clicking on arrow Now I have a menu like this But I want to add this So my main goal is to add an arrow on gradient. When I click on this, there shows a menu with another items and I don't know how to do it. Here is my code of menu...

Getting MainActivity reference in mvvm pattern I am learning MVVM pattern in android and in my model class I want to use shared preferences so I need activity reference: val sharedPref = activity?.getPreferences(Context.MODE_PRIVATE). It's a simple app with one activity and some fragments. What is the best way to get an activity reference when there is only one activity in app?

"<App> is having trouble with Google Play Services. Please try again" while usiing Google NearBy Messages API While using google NearBy Messages API I am getting error " is having trouble with Google Play Services. Please try again" Please guide me for this issue. Below is import for Google Messaging API implementation 'com.google.android.gmsplay services nearby17.0.0' Here is how I am subscribing using code val options = SubscribeOptions.Builder() .setStrategy(Strategy.BLE_ONLY) .build()...

Android-Things: Migrate gpiocallback functions to suspendcoroutine functions Following the example in the photo below, I want to migrate a function with callback to a SuspendeCoroutine function: 1) Is it possible to transpose the code below to SuspendCoroutine? (I ask why there may be reserved codes from the library, type: onGpioEdge and registerGpioCallback. 2) How can I do this? class ButtonActivity : Activity() { // GPIO port wired to the button private lateinit var buttonGpio:...

how to add percent calculator Kotlin I am new to programming began to learn kotlin right away I don’t understand how to add percent to the calculator heap percent I created but it does not work correctly I could not find how to add percent, they all write differently, but it doesn’t work for me I hope for your help I apologize if there was already a topic tvOne.setOnClickListener { appendOnExpresstion("1", true) } tvTwo.setOnClickListener { appendOnExpresstion("2", true) } tvThree.setOnClickListener {...

Why can't I fetch nested data from json using Gson? I have a json I fetch from an API that looks like this: {"success":true,"message":"","result":{"Bid":6886.97100000,"Ask":6891.58500000,"Last":6891.58500000}} All I want is to just save Bid and Ask values in fields of a class. First I parse whole json like this: val response = sendRequest(url)) val gson = Gson() val ticker : MarketTickerEntity = gson.fromJson(response, MarketTickerEntity::class.java) And then I try to parse it inside of my class init block and reassign to bid...

Sending List<MultipartFile> from one service to other gives "Current Request is not a multipart request" exception Taking in a list of multipart files and sending as a post request. Followed Uploading a List of MultipartFile with Spring 4 restTemplate (Java Client & RestController) @RestController @RequestMapping(values = ["/rest/send"]) class Controller { @PostMapping fun send(@RequestParam(value ="id") id: String, @RequestParam(value="files") files: List

Gradle Create a kotlin compile task I am in the process of creating a gradle plugin that should generate some code using some annotation processors. If working with java we can register a task of type JavaCompile and pass the annotation processor as an argument. In this case for a multi-modules project we can register a task for each module. I am wondering if this is possible to do for kotlin files. I can find KotlinCompile task but I can figure out how to configure it to use kapt and run before the build starts. Any ideas?...

Is it possible to set the dimension ratio of a ConstraintLayout itself? Not its separate components, but the dimension ratio of the ConstraintLayout itself, or a group of elements together. I'm fallowing this excellent tutorial to build a RecyclerView with GridLayoutManager and two CardView columns that span the entire width of their container, each CardView (square) contains an ImageView (also square) and a TextView. So, I need the CardView width to be "match parent" and get the same height (to be...

How to access an instance from one Kodein module in a different module? When using Kodein, if I have 2 modules and module B needs to use an instance from module A, is the best practice to import module A into module B or is there a better way to do it? For example, I have a networkingModule: val networkingModule = Kodein.Module("networking") { bind() with singleton { Retrofit.Builder() .baseUrl("https://api.example.com/") .build() } } And subscribersModule needs the Retrofit instance from networkingModule: val...

onResume() ExoPlayer video shows black screen Upon onResume(), my ExoPlayer video screen is black. LogCat shows that upon navigating out of the app and back, the SurfaceView containing the video player was destroyed and then recreated. I am not sure what is the problem, do you have recommendations on how to troubleshoot this or what to check in the code? /* // new for resuming a video if(videoPlayer != null) { videoPlayer.setPlayWhenReady(playWhenReady); videoPlayer.seekTo(currentWindow,...

Why Reciver function of String get intialized in kotlin I was playing around with Kotlin Recivers until i get stuck with this block of code assume this varaible var greet: String.() -> Unit = { println("Hello $this") } String is the receiver () -> Unit is the function type And we can call it in that form , which is clear enough for me "my extintion text".greet() //--> prints "Hello extintion text" But with this approch i can't get to understand the trick behind intializing the greet variable as we havn't set any...

Android - Kotlin - How to add Camera Photo to RecyclerView of imagebuttons I'm trying to add a camera photo to my recyclerview however I get this error: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { }} to activity {com.example.ohsht/com.example.ohsht.TakePhotosActivity}: java.lang.IllegalStateException: imageViewPhotoCardView must not be null I've been following the Android Tutorial however...

How can I change background if I click an imageview I would like to change the background of all the layers when I click an imageview, for example this imageview has the preview of yellow colour but when I click it I would like to change the background to an image with the name of fondoamarillo.jpg

Is there a way that I can change the backward compatibility of an android app? I've been developing an android app for a while now, but it turned out that my friend cannot install the finished app because he is using android version 5. I, first of all, want to check till which version of android will the app be supported, and if possible edit the backward compatibility.

Returning from Observable call vs non-Observable using RxJava (Android/Kotlin) I have a function that takes a boolean input value, and depending on that, it needs to subscribe to an Observable in one case and immediately return in the other case. Here is what it looks like: fun getMap(needsReauth: Boolean): Map? { if (refreshContext) { AuthManager.reauthenticate().subscribe { return createMap() } } else { return createMap() } } The reauthenticate() method above returns an Observable, and it needs to be called and only...

BottomSheetBehavior decrease size automatically when open Keyboard or slider image change Everything is working good but the issue is when Slider image change or keyboard is open then BottomSheetBehavior has decreased the size of View. Is there any way to stop this Open BottomSheetBehavior: rl_comments.setSafeOnClickListener { if (bottomSheetFilterBehavior.state != BottomSheetBehavior.STATE_EXPANDED) { bottomSheetFilterBehavior.state = BottomSheetBehavior.STATE_EXPANDED } else {...