How to match PreviewView aspect ratio to captured image using CameraX I have a PreviewViewthat occupies the whole screen except for the toolbar. The preview of the camera works great, but when I capture the image, the aspect ratio is complately different. I would like to show the image to the user after it is successfully captured so it is the same size as the PreviewView so I don't have to crop or stretch it. Is it possible to change the aspect ratio so on every device it is the size of the PreviewView or do I have to set it to a fixed value?

How do you make an invisible button that works (in android studio) So I want to create an invisible button, but when I try to do that button becomes invisible but it doesn't works at all. How can I make it so that it's invisible but still working?

Where do you write the logic for Fragments in Android Studio? Is it right to write everything on onCreateView?

Kotlin: Child Constructor Passing Default Value to Parent Consider the following classes: open class Parent(foo: Map) class Child(foo: Map): Parent(foo) This seems to work here because the definition of foo are identical in both classes. However when I try to do class Child(foo: Map? = mapOf()): Parent(foo) It no longer works because foo is defined as optional in the Child class. This is giving me issues because I'm trying to initialize the Child class in Java and obviously it wouldn't allow me to selectively pass in arguments like Kotlin, so I...

How to get test coverage for kotlin common? How to get test coverage for kotlin common in IntelliJ IDEA same as for java code?

Temporarily saving data I have a quite large bitmap that i have to pass between fragments and use in several different places and from what I know it is a costly operation. So I thought about saving this bitmap somewhere so that I only have to pass the URI. But I don't know how to save that image so that it is saved temporarily - I could save that in internal app storage but if a user closed the app when it's in the background or did something similar, I wouldn't be able to delete it so it's stuck there forever.

How can I replicate this UI behaviour How can I replicate this behaviour in an Android app, is only for learning purposes. I do know that in the bottom half they are using a recyclerview, but in the upper part where they are displaying the "You have 4.983 to spend" part I dont know how to add it, how do they split the screen to have them both? This is what I want to replicate

PersistenceException at Kotlin Lagom service When service starts at kube, i have error: 2020-09-16T220117.370+0300 [warn] com.lightbend.lagom.internal.javadsl.persistence.jpa.JpaSessionImpl [] - Exception while initializing JPA EntityManagerFactory javax.persistence.PersistenceException: No Persistence provider for EntityManager named defaultPersistenceUnit at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:85) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:54) at...

Can't retrieve item from Spinner in Android [kotlin] I am trying to show item in a spinner view which are retrieved from a database and later want to send the selected item to another function by pressing a button. My spinner is populated correctly however, when I am trying to use the item it doesn't work. I am using kotlin. Here is the code for spinner: spinnerOfChoices.adapter = ArrayAdapter(this, android.R.layout.simple_spinner_item, injuryName) spinnerOfChoices.onItemSelectedListener = object : AdapterView.OnItemSelectedListener{...

Cannot bind a nullable property with tornadofx viewmodel I'm trying to bind a nullable property (String?) from my domain model to a tornadofx view model. But I get a compiler error. The nullable properties are: idCard, phone, and discharge My code: class Patient(id: EntityID) : IntEntity(id) { companion object : IntEntityClass(Patients) var patientId: Int by Patients.patientId var name: String by Patients.name var lastName: String by Patients.lastName var recordNumber: Int by Patients.recordNumber var idCard: String? by...

How can I implement a LogIn System in Android Studio using a mutable List? [Im relatively new to Android Studio / Kotlin and would like to apologize in advance for any inaccuracies] I want to implement a LogIn System using Room for my local database. The following Query should provide a List with username and password, to check if they exist in the user_data Entity: @Query("SELECT userName, password FROM users_data WHERE userName LIKE :name_input AND password LIKE :pw_input") fun findUser(name_input : String, pw_input : String): List What would be the best way -...

Filter a list without knowing the list type I'm writing a Kotlin function to search a List, but the list type will be based on user input from a Spinner (_selectedRuleset is set by another function). private val _selectedRuleset = MutableLiveData() val selectedRuleset: LiveData get() = _selectedRuleset fun search (term: String) { val pattern = term.toRegex() val rules : List? = when (searchTerm.value) { @Suppress("UNCHECKED_CAST") "category1" -> selectedRuleset.value as List "category2" ->...

Simple 3D Shape faces not rendering as expected - OpenGL ES in Android Studio I am trying to make a rotating octahedron display correctly, I have successfully achieved other shapes such as a cube and tetrahedron, but I am experiencing some difficulty with this one. Here is the simple obj file I am using: v 0 -1 0 v 1 0 0 v 0 0 1 v -1 0 0 v 0 1 0 v 0 0 -1 # f 1 2 3 f 4 1 3 f 5 4 3 f 2 5 3 f 2 1 6 f 1 4 6 f 4 5 6 f 5 2 6 My code is as follows: class Shape(context: Context) { private var mProgram: Int = 0 // Use to access and set the view transformation...

Image picker that returnes multiple images I am programming a gallery app which i also want to use as an image picker. Therefore i added following lines to the AndroidManifest.xml which worked. Now, when i want to add a photo for example in WhatsApp in a chat, my app shows up as image picker after a long click on the image symbol. If i click on one of my photos it works and adds the clicked photo to the chat. I call this function for this: fun onPickMedia(action: MediaPickAction) {...

java.lang.NoClassDefFoundError: kotlin/jvm/internal/Intrinsics Exception while running word count example-Apache beam I am trying to run worcount example using gradle clean execute -DmainClass=org.apache.beam.examples.WordCount \ -Dexec.args="--project= --inputFile=gs://apache-beam-samples/shakespeare/* \ --output=gs:///counts" -Pdataflow-runner and I am getting the Exception, Exception is: java.lang.NoClassDefFoundError: kotlin/jvm/internal/Intrinsics at org.nosphere.apache.RatPlugin.apply(RatPlugin.kt) at org.nosphere.apache.RatPlugin.apply(RatPlugin.kt:8) I too have checked kotlin is...

ROOM/Android Sorting a List with Repository and ViewModel | Kotlin I am trying to sort through a list stored in the Repository. My ViewModel has a List that is referencing the items stored in the repository. Sorting occurs when a user presses a context menu item and that will change the list in the Repository. However, this action doesn't seem to be working. I tried using the debugging tool and it showed me that the Repository method was being called and things were being reassigned. I believed this should have worked as my ViewModel was referencing the...

Desugaring of Java 8 classes for Android doesn't work I was using the ThreeTen backport project for time/date classes and decided to switch to the newer desugaring way of using the standard java 8 time classes instead for my app which has minSdkVersion as 19 and uses Month, LocalDate and ZoneId classes. Also, using android gradle plugin version '4.0.1' and gradle version 6.1.1. So I went ahead and removed the backport library from my dependencies and added the right...

Error when using shared preferences to login in kotlin Im trying to use shared preference in order to skip the login activity. If the user click in the checkbox it means that the next time he uses de app he will go directly to de main activity.

viewpager2 previous small preview and next large preview android I am new in kotlin with android. I am working on viewpager2 with recyclerview. I am creating cards to display the information. I don't have picture to show but i will draw. When adpater item is 0 index Screen of moblie |----------------------------------------| 1st card. 2nd card +++++++++++++++++++++++ ++++ +++++++++++++++++++++++ ++++ |----------------------------------------| When adpater item is more than 0 and less than last index Screen of moblie...

How to pass a value back to fragment from dialog using Android navigation component? I am trying to pass data from dialog to fragment using the Navigation graph. The code below works for a fragment to fragment communication only. fun Fragment.getNavigationResult(key: String = "result") = findNavController().currentBackStackEntry?.savedStateHandle?.getLiveData(key) fun Fragment.setNavigationResult(key: String = "result", result: String) { findNavController().previousBackStackEntry?.savedStateHandle?.set(key, result) } How do you send data back to fragment from...

Why i can't use try/catch to catch exception in Kotlin coroutine? I have code in Android as follow: private fun test() { scope.launch { Log.d(TAG, "test: launch") try { val response: Deferred = async { Log.d(TAG, "test: in async block") throw IllegalStateException("an IllegalStateException") } response.await() } catch (e: Exception) { Log.d(TAG, "test: error ${e.message}") } } } I use MainScope to launch a coroutine and use async to...

Android Kotlin Broad Receiever in RecyclerAdapter Won't Communicate to Broadcast Receiever in MainActivity Context: No receiver is declared in the manifest since I am not declaring a new receiver. I am a bit confused about why the receiver in MainActivity does not receieve the broadcast sent from the recycler adapter. RecyclerAdapter holder.checkBox.setOnClickListener {view -> item.completed = holder.checkBox.isChecked Log.i("wow", "is checked: ${holder.checkBox.isChecked}") val intent = Intent().apply {...

Firebase RealTime Database blocking issue I'm facing the issue to connect the Realtime Database on specific devices and OS in Android for fetching the record Using "addListenerForSingleValueEvent" and "addValueEventListener" to retrieve the values from DB but can't able to get any callback. Using the latest version of SDK 19.4.0

Why isn't my data persisting after using SavedStateHandle? I am writing an app that stores a value after it get killed by the user. It is stored in the ViewModel and saved in the onClear function. I want to be able to reopen the app and see the saved value but when I access this value with the specified key, it comes back as null. Here is my code package com.example.sharedexpenseapp import androidx.lifecycle.LiveData import androidx.lifecycle.MutableLiveData import androidx.lifecycle.SavedStateHandle import androidx.lifecycle.ViewModel import...

Cannot use Dialog box in android I am trying to create a dialog box in android with an edit text in it, this edit text returns some text to a fragment inside main activity class NameDialog : AppCompatDialogFragment() { private lateinit var listener: NameDialogListener override fun onAttach(context: Context) { super.onAttach(context) try{ listener = context as NameDialogListener }catch (e:Exception){ Timber.d("Must implement NameDialog Listener")...

Error message meaning. How to integrate swagger with existing webflux project? I am trying to integrate swagger with an existing spring boot webflux project. Doing it from scratch works fine with no issues with no further configuration needed, but doing it in this existing project gives the below error message. I'm not sure what is causing the error. Are there dependencies that conflict with swagger (io.springfoxspringfox boot starter3.0.0)? Or am I missing a step like a missing config class file? I'm just not sure with this error message....

Use of coroutines in an android library affects Java application I am creating an android library (in kotlin) in which I will do some blocking IO operations. I would like to use kotlin coroutines to accomplish this, as described here: https://developer.android.com/kotlin/coroutines#use-coroutines-for-main-safety If my library is included as a dependency in an android application written in Java, in what way does the use of coroutines...

How Can I Start Kotlin Programming in IntelliJ Idea? I am not able to start my Kotlin Programming in IntelliJ Idea.. Can anyone provide me with a geniune Answer??? ''' fun main() { println("Hello World!!") } '''

http chunked file transfer in netty finished immediately I'm writing a http file server with downloading file in multiple thread with netty. When only using only HttpServerCodec(), every works perfect but OOM: direct buffer memory error. Then I encounter the ChunkedWriteHandler() handler. In my code, the handler dealing with file transfer has two ranges. Firstly, transfer the whole file when the request has 'Range' header. Secondly, transfer a range of file when the request hasn't that header. But the problem is, the browser(new Edge) either say...

Android 11, Custom Tabs, and FLAG_ACTIVITY_CLEAR_TOP In an application I am working on a Chrome Tab is used for an external OAuth flow. At the end of the flow the Custom Tab stays open with an informational message, and an email is sent that has a custom scheme link. Until Android 10 clicking the email link would return to the app, close the tab, and continue doing whatever it needs to. To achieve that we are using an TabLauncherActivity that starts the tab and a SchemeHandlerActivity that receives the scheme from the email and launches...