How to create an instance of a class and override its function in Kotlin? How would I write the following code in Kotlin? private final BroadcastReceiver broadcastReceiver = new BroadcastReceiever() { @Override public void onReceive(Context context, Intent intent) { }}

My question is there a simple format for creating a profile photo in an app that retrieves a picture from the user's phone gallery? Moving from Xcode to android Studio. new to coding. I've been searching for 4 days now. On how to get the two ImageButton below, capable of retrieving photos from the User's Phone Gallery. Is there an article that teaches this specific task for the new fragment system? It's a very common task now to all people to see their own progress within an app. I tried simply copying code from other pages into a new class and in my main fragment file. It just throws up too many errors I don't know how...

Google Maps works in Activity but get blank window in fragment I'm trying to place google maps on my application. Map should be fragment that is called from BottomNavigationView. Unfortunately when I place fragment in my custom TabBar it shows only white background. What's more when I run MapViewActivity generated by Android Studio everything works perfect but my point is to have Google Maps in fragment. Problem is also that I doesn't get any error message. Only white screen in place where fragment should load I tried extend SupportMapFragment, standard...

Getting data from a Json on a local host to Android Studio I made a local server using Node.js that shows a Json. I'm trying to get the data on that json and use it on Android Studio, but the emulator doesn't get any response from the local host. I've tried the same code with this JSON on Android Studio and it worked. Node server: var fs = require('fs'); var express = require('express'); var app = express(); var json = './users.json'; var jsonFile = require(json);...

Type mismatch. Required: Array<Uri>! Found: Array<Uri? The ? and ! syntax is very confusing in kotlin! I'm declaring a value callback as a private member of my activity: private lateinit var mFilePathCallback: ValueCallback And I assign it on onShowFileChooser on onCreate method like so: override fun onShowFileChooser( webView: WebView?, filePathCallback: ValueCallback?, fileChooserParams: FileChooserParams? ): Boolean { mFilePathCallback = filePathCallback!! //Assigned here val intent =...

Kotlin: file-level private functions generate a new public class I am migrating a Java codebase to Kotlin, and I have a Java class with the following quite common structure: class A { // public static factories // private constructors // public A methods // private A methods // private static helpers } My problem is what to do with the private static helpers. In Kotlin, if I put them as file-level private functions: class A private constructor(...) { companion object { // factories } // A methods // private...

init method in kotlin depending on order of variables and init method declaration In kotlin, for any class which has an init method (I found this example in a ViewModel) why is the following valid: val variable1 = "nothing" fun example1() { variable1 variable2 } val variable2 = "nothing" the order in which I declared the variables and the method did not make a difference, I can still access variable2 inside the method, however, val variable1 = "nothing" val variable2 = "nothing" init { variable1 variable2 variable3 } val variable3 = "an...

Kotlin Android Studio - Var is seen as val in SDK 29 I'm experiencing a pretty strange bug in Kotlin. I have var myClipboard = getSystemService(CLIPBOARD_SERVICE) as ClipboardManager? var myClip: ClipData? = ClipData.newPlainText( /* my code */ ) As a var variable, I should be able to reassign his value, but when I do myClipboard?.primaryClip = myClip It gives me the error Val cannot be reassigned The strangest things is that I'm using this code by weeks and it always worked. It stopped working today when I opened the project....

Http networking library supporting proxies in java I need an http library for java/kotlin that supports proxies, preferably one that doesn't depend on system proxy, to allow async connections to multiple proxies.

How to open urls to X domain with my app, and pass it as argument? I'm making an app that takes an URL to X domain, makes a get with Jsoup, scraps some content, and the present that content. I've already done that with an EditText on my app, but what i want now is that the app can be selected as an app to open the url from other apps(You know, when the app shows an URL, you click, and then a prompt asks which app would you want to use), and then pass that url as the parameter of the EditText, doesn't matter if directly start execution, or if just paste the...

How can I implement CoroutineWorker using a third-party library that uses callbacks? I'm trying to implement a CoroutineWorker to do some background work in an Android app. The third-party library I'm using uses callbacks like onConnected, onChanged, etc. How can I use this library inside a CoroutineWorker? This is what I have so far override suspend fun doWork(): Result { return try { val appContext = applicationContext var mReporter: StepCountReporter? val mStepCountObserver = object : StepCountReporter.StepCountObserver { override...

How to access Application class variables in activity in kotlin android I used to access application class private variables by using a public methods in java How to do the same using kotlin App.kt class App : Application() { private var app: App? = null private var movieAppComponent: MovieAppComponent? = null override fun onCreate() { super.onCreate() app = this movieAppComponent = DaggerMovieAppComponent.builder() .applicationModule(ApplicationModule(this)) .netModule(NetModule(Keys.BASE_URL,...

Coroutine not respecting mutex.lock hence more than one coroutine entering the safe code at a time I have a shared piece of code in a function, that should be accessed one at a time . I used mutex.lock/unlock to achieve this while working with coroutines. suspend fun testfunction() { mutex.lock() arrayList.add("abc") hashmap.put("abc","efg") mutex.unlock() } wanted only one coroutine to access these two dataStructures at once, with help of mutex but its not working.I see multiple coroutines entering the lock.

Need to show download progress bar near toolbar through out application While uploading in AWS from current fragment need to show download progress. Need to show even I switched to other fragments or activity. Attached screenshot for reference

Detecting swipe gestures in WebView disallows clicks in it I have a WebView and I am implementing a TouchListener to it which can detect horizontal swipe. webView.setOnTouchListener { v, event -> when ( event.action ) { MotionEvent.ACTION_DOWN -> x1 = event.x MotionEvent.ACTION_UP -> { x2 = event.x val distance = Math.abs( x2 - x1 ) if ( distance >= thresholdDistance ) { if ( webView.canGoBack() ) { webView.goBack() } } }...

text from a URL in to a textView crashes app using Android Studio/Kotlin I'm very new to learning Android Studio, I'm currently testing reading a json (or any text really) from a URL and displaying it in a textView. However, just having the folowing 1 line and nothing else in the function causes the app to close. Any help or pointers would be much appreciated Activity_main has a button with onclick of "go" I've tried this on 2 VMs (marshmallow and Q) and 2 real phones, Nougat and Pie. MainActivity.kt has the following code: package com.name.readremotejson...

how can i insert CALLBACK code in my code First of all, I am not good at speaking in English because my native language is not English. I'm studying Kotlin, Android, and MVP. When I created JOIN Action and LOGIN Action on Android app, A problem has occurred. Working with MVP pattern in LOGIN Action. But the results on the logins aren't exactly what I want. I'll show you the code. class LoginModel { var TAG = "LoginModel" private var ID: String private var PW: String var resultTxt: String = "" var auth:...

Error:Kotlin: The Kotlin standard library is not found in the module graph I run simple java program in intellij.When throw Error ErrorKotlin The Kotlin standard library is not found in the module graph. Please ensure you have the 'requires kotlin.stdlib' clause in your module definition. I don't know please suggest me, how to resolve this problem.

var viewpager: CustomViewPager? = null vs. lateinit var viewpager: CustomViewPager What is the best way to define global variables in a Kotlin/Android activity/fragment? What are the different scenarios when you should use these 2 methods for defining a global variable: var viewpager: CustomViewPager? = null or lateinit var viewpager: CustomViewPager ? If I use the former, I won't have to check for null in my code. For example if I used lateinit for the following: viewpager = activity?.findViewById(R.id.viewpager) then I would have to check for null.

How to get length of a character array in kotlin? I am trying to find the length of two different character array but I am only being allowed to use array.size only once. How to bypass this problem? fun chararraytostr(inp1: CharArray): String{ var arlen: Int = inp1.size //here lies the problem var out1: String = "" for(j in 0..arlen-1){ var str = inp1[j].toString() out1+=str } return out1 } fun uppercase(input: String): String{ var temp1: CharArray = input.toCharArray() var len = input.size...

Check if NestedScrollView is Scrollable I need a function which returns a boolean if my screen is scrollable inside a NestedScrollView. I currently have a RecyclerView inside a NestedScrollView and the content of the RecyclerView is dynamic (i can add or remove items). Everytime i swipe to delete i want to call the function which checks if the NestedScrollView is scrollable. I am currently using this function: fun isRecyclerScrollable(binding: FragmentToBuyBinding): Boolean { val e =...

Error inflating class com.google.android.material.textfield.TextInputLayout This is my app theme: I got an inflate error caused by a not using a desired theme. In the Manifest I didn't overwrite the theme for the activity that I got this error, so the AppTheme definded in styles.xml is used. Error: android.view.InflateException: Binary XML file line #122: Binary XML file line #122: Error inflating class com.google.android.material.textfield.TextInputLayout Caused by: android.view.InflateException: Binary XML file line #122: Error inflating class...

Socket.io - How to emit Kotlin object in same way that JS code does? I want to move implementation from react app which is working on Socket.io to my Android app. However, I cannot get the same result from the Kotlin code. I don't have access to the server-side code so I need to map the code running on React side. Here is working code from react app socket.emit('message', {type: 'image', photo: 'some base64 code'}); This is the Kotlin code that I wanted to get the same result on the server side data class Data(var type: String, var photo: String)...

Expanded Bottom Sheet Implementation I want to achieve the bottom Sheet as shown in the image given below I want to know what the button is called which is circled in the given picture Is it Floating action button or a part of Bottom Sheet??? https://material.io/design/components/sheets-bottom.html#expanding-bottom-sheet<a href="https://i.stack.imgur.com/aZ7Zf.jpg" rel="nofollow noreferrer">enter image...

Hibernate: PSQLException in a OneToMany relationship I have SpringBoot application in which I have a postgres database with a list of cinemas: cinemadb=# select * from cinemas; id | name ----+--------------------------- 1 | London''s Electric Cinema 2 | Alamo Drafthouse 3 | Cineteca Matadero 4 | Cine-de Chef 5 | Castro Theatre 6 | Cine Thisio Each one of this cinemas displays one or more movies (which are in another database). I created a relational table: cinemadb=# select * from cinema_movie; cinema_id...

Why do I get an Error about 'smart cast', when using a Delegate in kotlin? I created a Delegate class in Kotlin, for 'cyclic' variables, such as hours: when '25' is added to an hour with initial value '0', the result should be '1', since there is no such thing as '25' hours. The class I created works, but when I reassign such a delegated variable, and then print it using 'print(...)', I get an Error saying 'Smart cast is impossible, X is a mutable variable' Am I doing something wrong ? How could I fix the problem ? I have tried to add an explicit cast, which...

Is there a way to get all the fields of an object into a List (ArrayList)? I have a class, which has some fields holding some values. Now, I want to get those fields which belong to that class into a List or an ArrayList. Is there a method to get that done?

Empty UI when using ConstraintLayout in Fragments Android I am using ConstraintLayout in a Fragment, but when I run the app the UI is empty, below are the Fragment and an Activity where the fragments are shown. Fragment Layout activity_main Contains NavHostFragment

GRPC ssl with self-signed cert I'm trying to use a self-signed certificate with GRPC. I generated the certificate / key with: openssl req -x509 -nodes -newkey rsa:4096 -keyout key.pem -out cert.pem -days 365 This gave me two files: cert.pem and key.pem. I have a Kotlin GRPC server that I setup like follows: val ca = classLoader.getResourceAsStream("cert.pem") val key = classLoader.getResourceAsStream("key.pem") ServerBuilder .forPort(8443) .useTransportSecurity(ca, key) .addService(...) .build()...

onClick not working in mvvm in android databinding I am trying to implement mvvm and databinding in kotlin first time. I followed some tutorial and able to implement same. But now button click is not working which I have written in mvvm. Here is activity_login.xml Here is my ViewModel code : class LoginViewModel(application: Application) : AndroidViewModel(application) { var email: ObservableField? = null var password: ObservableField? = null var progressDialog: SingleLiveEvent? = null var...