How to change tomtom map's marker in kotlin Trying to add a custom icon marker to tomtom maps on android project here the function am using for this : private fun addingStation() { val i = ResourcesCompat.getDrawable(getResources(), R.drawable.ic_dialog_alert, null) val database = FirebaseDatabase.getInstance() val myRef = database.getReference("station") // Read from the database myRef.addValueEventListener(object : ValueEventListener { override fun onDataChange(dataSnapshot:...

DatePickerDialog is not working in fragment I have this problem when adding the DataPickerDialog, the project structure is the drawer layout example of android studio. package asaek.ikusi.ikusi_1.ui.home import android.app.DatePickerDialog import android.os.Bundle import android.view.LayoutInflater import android.view.View import android.view.ViewGroup import android.widget.TextView import androidx.fragment.app.Fragment import asaek.ikusi.ikusi_1.MainActivity import asaek.ikusi.ikusi_1.R import...

Cannot display text on viewPager items after applying FlipView Kotlin I'm new to this. I created ViewPager with FlipView items in it. Each FlipView Item contains front and rear side (both TextView). However I cannot display any text on these items and have no idea why is it. FlashCardsSlideAdapter.kt class FlashCardsSlideAdapter(private val context: Context, private val arrayOfRands: ArrayList): PagerAdapter(){ private val myImages = arrayOf(R.drawable.a1, R.drawable.a4, R.drawable.a3, R.drawable.a4) private var layoutInflater:LayoutInflater? = null...

Kotlin spinners in fragments using I'm new to Kotlin and I'm just trying to figure out how to use spinners in a fragment. So I guess the code below is how I should initialize the spinner but how do I point this to my premade strings in R.array and how do I capture the selections on button click. Thanks. class paychart : Fragment() { private lateinit var paychartview: View override fun onCreateView( inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle? ): View? { // Inflate the layout for...

How to iterate a JsonElement with unknown keys on Kotlin using kotlinx? I'm new on Kotlin and I'm trying parse a Json file to take your values. The first problem is that I don't know the keys and the second problem is that I don't know use Kotlin perfectely. Let me explain the case. This is a Json format that I getting from web: { "Meta Data": { "1. Information": "Intraday (5min) open, high, low, close prices and volume", "2. Symbol": "MRFG3.SA", "3. Last Refreshed": "2019-09-30 130500", "4. Interval": "5min", "5....

Kotlin Observe Live Data Every 1 second can any one advice me is my code is right or wrong ? working fine. Kotlin Observe Live Data Every 1 Second Live Data I tried this code working fine tested in android version 6 & version 9. Notes: ViewModel is a class that is responsible for preparing and managing the data for an {@link android.app.Activity Activity} or a {@link androidx.fragment.app.Fragment Fragment}. It also handles the communication of the Activity / Fragment with the rest of the application (e.g. calling the business...

Gradle Configuration for Kotlin Multiplatform Project in Java and Js Seems all ok! But... I have created a Kotlin Multiplatform Project in Js and Java. I worked on create the right tests for all target and the right configuration for the build. Seems all go right, i managed to create the build and set it in the right way. Today i have opened the project and it stop, the build complete successfull but test and java compilations don't be executed. So how i can configure it? With code and result all will be more clear build.gradle.kts import...

Doing AES-GCM encryption on Android API Level 15+ I want to do AES-256-GCM encryption on Android API 15+. Here is my code: import android.util.Base64 import java.security.SecureRandom import javax.crypto.Cipher import javax.crypto.SecretKey import javax.crypto.spec.SecretKeySpec import javax.crypto.spec.IvParameterSpec fun encryptGCM(key: String, plaintext: String): String { val decodedKey = Base64.decode(key, 0) val secretKey: SecretKey = SecretKeySpec(decodedKey, 0, decodedKey.size, "AES") val secureRandom = SecureRandom() val...

How to upload Image Bitmap using without converting to String using volley I am uploading several bitmaps of Images to the server using Volley Library. I also need to receive the image file in PHP as $_FILES["uploadFile"]["name"]. I checked a few solutions which utilize bitmap to string method which doesn't provide good results when the bitmap size is Big. I got a few solutions with volley multiparts as well but they are not well explained and don't understand how to write it in kotlin. I expect to store the image bitmap in the desired folder with only Volley...

Android App fails to connect to the internet I am working on an app which uses Android API 28, but I am having an issue with the app not always recognizing that the phone has internet access. However, other apps on the phone is working. The function I used to check the internet connection is: fun checkInternetConnection(): Boolean { val connectivityManager = getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager val networkInfo = connectivityManager.isDefaultNetworkActive return networkInfo }

Retrofit with Kotlin does not trigger enqueue I'm trying to implement retrofit with Kotlin. Please look at the following code: Here is the main retrofit method which should get the user from API(Webservice): const val BASE_URL = "https://jsonplaceholder.typicode.com" fun getUser(userId: Int){ val loggingInterceptor = HttpLoggingInterceptor() loggingInterceptor.level = HttpLoggingInterceptor.Level.BODY val client = OkHttpClient.Builder() .connectTimeout(60, TimeUnit.SECONDS) .writeTimeout(60,...

Moxy Fatal Exception - Exception from call site #0 bootstrap method Sample code from Moxy dosen't work https://github.com/moxy-community/Moxy Source code is separated to different files, but now presented for less complicated view Empty application (without anything with MVP, it only has one empty screen) works But if i add code as in the example it crashes with fatal exception (provided below) interface ExplorerView : MvpView {...

Auto Focusing on Android Studio I'm working in android studio and using kotlin and I'm trying to get the camera to auto focus in my app. There is a similar question here: https://stackoverflow.com/a/34528716/6939854 I'm looking for a way to implement a something similar with androidx. Some of my code as well: private fun startCamera() { val previewConfig = PreviewConfig.Builder().apply { setTargetAspectRatio(Rational(1, 1))...

Can't save image in external storage in android Oreo I want to save the image in external storage. My function works on android 5 but doesn't work on android 8. I have android.permission.WRITE_EXTERNAL_STORAGE in Manifest. private fun saveImageToExternalStorage(finalBitmap: Bitmap) { val root = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).toString() val myDir = File("$root/saved_images_1") myDir.mkdirs() val generator = Random() var n = 10000 n =...

Setting background and button listener on toggle button doesn't work after app termination I am using drawable to set background on a toggle button. It works fine when I am in the app and changing any conditions, based on which my toggle button background changes. However if I terminate the app using app switcher, the background becomes transparent. toggle_button_backgroun.xml Functions: private fun configureToggleButtons(button: ToggleButton?, text: String, selectedButtons: Map) { button?.text = dayText.first().toString() button?.textOff =...

Reasons A Connection/Query to Google Play Might Fail I'm designing a state machine for an authorization model that changes what my app allows the user to do depending on whether or not they have an active subscription and I'm currently doing research on why a connection to Google Play might fail so I can cover those cases. I intend for my app to check subscription status periodically while the app runs, so it's important that my approach is reliable. I'm aware of the no internet connection case, but as I'm trying to cover all my bases, I want...

Firebase Data not displaying in emulator The Firebase data is not being imported and displayed in the emulator. Sync successful, build successful, install successful,however only the likeimage and the current date(not date in Firebase database) and null (post) displaying Main Activity: class MainActivity : AppCompatActivity() { var selectedCategory= FUNNY lateinit var thoughtsAdapter: ThoughtsAdapter val thoughts = arrayListOf() val thoughtsCollectionRef = FirebaseFirestore.getInstance().collection(THOUGHT_REF) override fun...

http request timeout on error android app Hi i have a server app that is run on my computer and in order to use it on my android application i used serveo to get a global domain for my localhost like this : ssh -R myexpressjsproject80localhost:3000 serveo.net and on my android application i do post like this: fun getServerResponse(json : String){ val neabyURL = url + "nearby" val client = OkHttpClient() client.setConnectTimeout(30, TimeUnit.SECONDS); client.setReadTimeout(30, TimeUnit.SECONDS);...

Is it a good idea to put function type as values in HashMap? I have a question about the performance of putting function type as a values in HashMap. I've saw my colleague's code being written likes this: var mHandleMap = HashMap Unit >() fun init() { mHandleMap.put(URL1, doSomething1) mHandleMap.put(URL2, doSomething2) mHandleMap.put(URL3, doSomething3) override fun onPageFinished(webView: WebView, url: String) { mHandleMap.forEach { (key, urlFunc) -> if (urlStr.contains(key)) { urlFunc(webView)...

Kotlin: how to copy file from assets folder to databases folder So the code should be very straight forward just copy the database file to the databases folder. for some reason I keep getting a java.iofilenotfoundexception I'm trying to make this to work in an activity. my second question is what changes do I need here for it to work in a fragment? Thanks. // Copies your database from your local assets-folder to the just created // empty database in the system folder @Throws(IOException::class) private fun copyDataBase() { val outFileName =...

Android paging library on after not getting called In my app i've implemented google paging library here i'm able to successfully load data into recycler firstly from arraylist 30 images will be loaded and later on when user scrolls down i want the user to be shown next 30 images from the arraylist for that i've implement a PageKeyedDatasouce class where onloadafter is called however in my recycler after i scroll to bottom nothing happens and my recycler view is not getting updated with new items! I tried referring other answers as suggested...

In Android, can a file be moved to inside the app's private directory? I have a file in the downloads directory. Let's call it OldFile, of the File class. I seem to be move it anywhere I like using OldFile.renameTo(File(some new file path)) UNLESS the new file path is inside the application's private file directory as obtained from context.filesDir. This Kotlin snippet works, for instance: val newFileLocation = File(Environment.getExternalStorageDirectory().absolutePath + "/test.txt") oldFile.renameTo(newFileLocation) but this snippet fails silently,...

Why :: syntax cannot call kotlin function in some cases? Try this code: fun foo(arr: IntArray): Boolean { arr.also(::sort) } IDEA told me that the sort function needed to import, Like this: import java.util.Arrays.sort And it call this: public static void sort(int[] a) { DualPivotQuicksort.sort(a, 0, a.length - 1, null, 0, 0); } But it should use kotlin function directly, Like this: fun bar(arr: IntArray): Boolean { arr.also { it.sort() } } And it call this: public actual fun IntArray.sort(): Unit { if (size > 1)...

what does The application could not be installed: INSTALL_FAILED_OLDER_SDK The application's minSdkVersion is newer than the device API level. means android { compileSdkVersion 'android-Q' buildToolsVersion "29.0.2" defaultConfig { applicationId "com.example.mykotlintutorials" minSdkVersion 'Q' targetSdkVersion 'Q' versionCode 1 versionName "1.0" testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" }

how to change the border size of checkbox in kotlin android I am trying to make a checkbox smaller and change the size of border . I have tried playing around with layout in XML and .width()/.height in Kotlin . Neither does anything to change the size of it. I went to the tutorial that was recommended to other that asked this questions, but I did not understand what he did. Any suggestions?

Android RecyclerView No adapter attached (Kotlin) Hi i'm a high school student studying android I tried to display items to my fragment recyclerview but it does not work. E/RecyclerView: No adapter attached; skipping layout.

What parsing strategy is best for Http messages? I'd like to create a program that parses http requests and responses. I already have created its ADT following the specification here, which was pretty easy given that every message follows the same structure. ADTs in Kotlin. I've looked into some parsing libraries like <a href="https://github.com/h0tk3y/better-parse"...

Force to non-null without using? In Kotlin, if I have the following: val html = response.body()?.string() html will compile to be nullable. I need to pass this to a function that does not allow nullables. Is there a way to pass it (or convert it) in a way that doesn't use !!

sort unsorted collection with another sorted collection's field I have an unsorted List of Users and a sorted list of Users id. Id is a string. I want to sort first list by second. How to do that in Kotlin? data class User(val name : String, val id : String) val unsorted = listOf( User("Max", "b12s11"), User("Joe", "dj1232"), User("Sam", "23d112"), User("Tom", "k213i1") ) val sorted = listOf( "dj1232", "b12s11", "k213i1", "23d112" ) // what I need val result = listOf( User("Joe", "dj1232"), User("Max",...

Coroutines to call a REST API -&gt; FATAL EXCEPTION : main I need to fetch some data from a REST API, everything is ok when I'm 4G or wifi connected but when I'm in airplane mode, the app crashes with : "E/AndroidRuntime: FATAL EXCEPTION: main" Before that I have a log (not an error saying : "Skipped 1013 frames! The application may be doing too much work on its main thread.") So I suppose fetching the API with no network crashes the app because it's running in the main thread. BUT I'm using coroutines and to me, I'm doing it right :...