ServerValue.TIMESTAMP firestore in kotlin how can i get the current date "day-time" in my document in firestore as i wanna display photos set ordered by name . this way doesnt work Kotlin class Data( var urlList: MutableList,var time: MutableMap) { constructor() : this(ArrayList(), ServerValue.TIMESTAMP) }

Expression based Autowire in Spring Boot (with Kotlin) Situation I'm trying to come up with a methodology to conditionally load one bean (based on the existence of 2 property or environment variables) and if they are missing load up another bean. Vars So the two property (or env vars) are: ProtocolHOST ProtocolPORT So for example java -jar xxxx -DProtocolHost=myMachine -DProtocolPort=3333 would use the bean I want, but if both are missing then you'd get another bean. @Component("Protocol Enabled") class YesBean : ProtocolService {}...

How to put text above dots indicator - Viewpager - KOTLIN I'm using a library called PageIndicatorView, which is a light library to indicate ViewPager's selected page with different animations and ability to customise it as you need. Till here everything is ok, until I started to realize that I need to do the following scenario to my "dots": The dots are dynamic, and the number of them is conditioned by the number of images available on the viewpager. Can...

addEventListener on HTML input not working within an Android WebView I am loading the following page on an Android WebView: URL This is an overview of the page loaded. I am trying to add a click listener on the RESET button. This button has no id but has a name='resetbutton', so I tried to get a reference to it using document.getElementsByName('resetbutton')[0], and as you can see on the...

Kotlin Extension functions to split big classes Recently at my company a debate started after reviewing a different approach for writing heavy duty classes. A big Java class holding component specific logic (no standard OOP principles made sense) had to be rewritten in Kotlin. The solution provided was splitting the logic in categories and the categories into separate files with internal extension functions to the main class. Example: Main.kt class BigClass { // internal fields exposed to the extension functions in different...

Popup menu for Copy/Paste does not appear in full size When I double tap or long click on a text in EditText, the PopupMenu with copy/paste options doesn't appear in full size. I use an activity, that hosts a fragment for detail message. I also tries to play with styles of the Popup and got no result. Style, which I use in the activity @color/black @color/white @style/AppSearchViewStyle center @color/gold...

Casting response to return moddel using Generic type to deserialise api response I have an API that returns a wrapped result and I want to make one generic wrapper instead of 20. However I can't get the result value to be cast to my generic type. This is the code: On response from api: override fun onResponse(call: Call, response: Response) { val userResponse = response.getResultAs() userResponse?.let { user -> App.shared.userSettings.edit().putString(UserSettingsKeys.ACTIVE_USER.key,...

Firebase Problems I'm learning android studio, and at a section through the guide I follows, the firebase console has changed design dramatically and I'm stuck in the tutorials. The step is where I'm supposed to connect my app with firebase and load(save) data into the firebase, but I can't get it to cooperate with my code. I quite don't get it how I'm going to create the database, I've tried with the following: Add colleciton -> Collection ID: Users -> Field: Users -> Value: True but when i run the...

Kotlin convert PKCS1 to PKCS8 I generate private key this way: val keyPairGenerator = KeyPairGenerator.getInstance("ECDSA", "SC") val spec = ECGenParameterSpec("secp256k1") keyPairGenerator.initialize(spec, SecureRandom()) keyPairGenerator.genKeyPair() val kp = keyPairGenerator.generateKeyPair() And im getting 144 length private key. Then i convert my private key to PKCS1 format: val pkInfo = PrivateKeyInfo.getInstance(kp.private.encoded) val encodable = pkInfo.parsePrivateKey() val primitive =...

Kotlin Lists pass by value? Dears I'm trying to make a copy of my list that contains arraylists inside of it, but when I edit the copied value, the original values gets changed, which means am passing my ref, I tried all sorts of methods like using the copy method for each item, or creating a list/mutable list from the original but it didn't work, so my question is how do you pass a value in kotlin instead of ref? I made the original as val and its field too.

Swagger Pair of int and string as key in map Hi I'm forcing problem with probably deserializer. So I've got response object like: Map But in swagger model it's visible as: { < * >: [...] } Ofc I have jackson deserializer based on Deserializing non-string map keys with Jackson

Kotlin Gson Cast Issue I am attempting convert JSON into a list in Kotlin using java, however it throws some weird errors. I am running this code on an Android vm. Code: val json = Ion.with(applicationContext) .load("$url/get/entries") .asString() .get() println(json) var entries = gson.fromJson(json, mutableListOf().javaClass) ((entries as MutableList)[0] as Entry).copy() Stacktrace: E/AndroidRuntime: FATAL EXCEPTION: main Process: carson.com.scoutingapp, PID: 22484 java.lang.ClassCastException:...

Realm configure project with default API roles and manual schema version Is it possible to use a configuration from default Realm as: var configuration = SyncConfiguration.automatic() and then override some configuration variable properties, I need to have default roles and permissions from default Realm API, and later assign my custom schema version number and migration logic file.

What is the best way for downloading audio and image files in Android especially by using kotlin I'm new in Android . I'm building an app which I need to download json,audio and image files . I've searched a lot and I realized that, the best way for getting json is Retrofit. I've learned it but when I wanted to use it for downloading Image and especially audio file (mp3) I couldn't find suitable help. I heart that Glide can be the best way for downloading image files. Please give me the best solution to use on my app to download json,image and audio files . I've got sick of that.

Jetty Performance I've recently inherited a project written in Kotlin and extends Jetty 9. This project is a proxy to our company's current production custom web-server written in C sharp. In the process of testing the impact this proxy has on the performance of a simple hello world web-service call to the server I've seen the response time quadruple compared to calling the service directly through the web-server. The choice to use Jetty and Kotlin was made before I joined the company and the original...

Removing unncecessary parts from String I'm consuming a client that I cannot change and it sends me data that looks like that: "BOOKING - PAID (price.amount=70, price.currency=EUR)" and I would like to retrieve from that only 70 EUR What is the best way to do such thing in kotlin? I didn't find any removeAll("", "", ...) functions for String, only replace but would have to chain them to remove both price.amount and price.currency.

HeadSet, TailSet, SubSet in TreeSet How realtion between (headSet, TailSet, Subset) and TreeSet work? When you remove some elements from tree if this elements contains in Headset, TailSet or SubSet they will be removed in this sets. I want to make my own implementation and i want to know how this relation is works. Can someone pls explain or give some resources where i can find information? i have wrote like this override fun tailSet(fromElement: T): SortedSet { val flag = !this.contains(fromElement) if (flag)...

WorkManager - how to delay task? I am building a functionality that will allow merchants to set the schedule of their business. Such functionality would automatically change the variable open to true and false accordingly to the times the merchant set in each day of the week. Therefore, there would be a total of 14 possible different times. I am trying to build a recurrent background task that would accomplish such a thing using WorkManager, the new Android Architecture Components library. val scheduleStartWork =...

how to implement nested Value Event Listener to retrieve data from firebase i want to retrieve data from fire base by nested ValueEventListener. first i find deals present or not in rooms tree after that is deals present then i want value of discount on that deal. fun deal(room:String): Flowable? = observeValueEvent(ref.child("rooms/$room/deals")) .map { snapshot-> var deal=snapshot.key if(deal!=null){ observeValueEvent(ref1.child("deals/$deal")).map { snapshot1->...

Android Oreo - Unable to schedule Alarm using JobIntentService I have been researching how to schedule an alarm targeting devices Oreo +. My current approach is using AlarmManager, a Ringtone service and broadcast receiver. I got the alarm to ring and display notification but the notification and the alarm does not fire for Oreo + devices. I learned that using JobIntentService is a good practice due to Doze and other background limitations. Currently, when using a JobIntentService, I get an " java.lang.RuntimeException: An error occurred while...

kotlin: doAsync - "suspend function should be called only from a coroutine or another suspend function" I'm trying to wrap my head around clean architecture -- the interactors, specifically. Contrary to most examples out there, I'm using just plain Kotlin instead of rxJava or something. So an Interactor/UseCase is a piece of executable domain logic used to interact with the presentation layer. package [...].domain.interactors.base import [...].domain.threading.Executor interface UseCase { /**Encapsulates a computational step on the model. Should be executed in the background by an...

download file from webview to internal storage The following code works perfectly to download mp3 file in external storage, but doens't work to download file in internal storage. A lot of smartphone doesn't have external storage. What can i do? I don't know how to implement async task in kotlin, if it is needed. mywebView.setDownloadListener(object : DownloadListener { override fun onDownloadStart(url: String, userAgent: String, contentDisposition: String, mimetype: String,...

Is it a good practice to use Nothing in generics? Like in this example: sealed class Option object None : Option() //

null cannot be cast to non-null type android.support.v4.view.ViewPager - KOTLIN I know that these question has been already answered, but I think it's a different deal. So, I have the following code: viewPager = findViewById(R.id.viewPagerGaleria) as ViewPager val adapter = ViewPageAdapter(this) viewPager.adapter = adapter //dots val pageIndicatorView = findViewById(R.id.pageIndicatorView) as PageIndicatorView pageIndicatorView.setViewPager(viewPager) And when I run it this occurs: ... kotlin.TypeCastException: null cannot be cast to non-null type...

ViewModel backing properties [kotlin] Looking to the code of some Google's demo app (like sunflower or Google io 2018 app) and I've noticed that for the viemodels' backing properties they use a separate instance of the same type with a custom getter; like this: private val _userData: MutableLiveData; val userData: LiveData get() = _userData; but why do they do that? Isn't better to directly make the _userData accessible? Could it be because while _userData is a MutableLiveData they don't want the observer to be able to...

Rx - Combine new input with previous output I have following case of Reducer: class XYZ Reducer(private val state: BehaviorRelay) { override fun invoke(events: Observable): Observable = events.ofType(Event::class.java).map { event -> handleFieldClicked(event, state.value) } As reducer requires 2 info: 1. New event 2. Previous state I am passing behavior relay of states to the reducer. I tried to find a way to have access to previous state and current event in map{}, like scan, all I...

How to get retrofit response in kotlin I'm trying to parse json using retrofit, but this is the first time i'm using retrofit this is the json looks like { "results": [ { "idEvent": "576561", "idSoccerXML": "389946", "strEvent": "Liverpool vs Cardiff", "strFilename": "English Premier League 2018-10-27 Liverpool vs Cardiff", "strSport": "Soccer", "idLeague": "4328", "strLeague": "English Premier League", "strSeason":...

Android custom view inherit all styles and attributes from parent If you create a custom view that extends a parent view, how can you inherit all styles and attributes from the parent view? For example if I declare a SeekBar in xml and style it, everything works normally. If I extend this view with no additional methods all the default styling and formatting is gone. Original xml. The styling here works as expected: If I extend SeekBar without adding anything, all the styling is different. For example the track color is different, and the...

Button connect firebase save data Im having big problems with sending request for a game between users. I tried to get the real-time firebase to work, and it does, now. But then another problem occurred, when implementing the code for the users to send request to each other for game playing. When button is fired, the app immediately crashes, no info in logcat either, I cant find whats wrong in the code, so I wonder if anybody else in here might find a solution for this bug? import android.support.v7.app.AppCompatActivity...

Where and how null value are stored in general programming? Here, I am not asking about the particular language, I'm asking about the conceptual level, where null values are stored or referenced? There are many questions and many answers to this topic. But none is able to satisfy me. Please describe in easy language. As I am totally beginner. Hope for any positive reply :)