How to use flow with workManger I need got the data form background , this job will accompany the hole app life cycle . I try to use WorkManager to instead of Service. Read the android develop guide , I guess should use CoroutineWorker , And use Data api to return a Flow. It's diffcuclt to me , I have no idea to write the code ~

FileNotFound Exception when saving an image to sub directory in external storage private fun takeScreenshot() { val now = Date() val formattedTimestamp = DateFormat.format("yyyy-MM-dd_hh🇲🇲ss", now) try { //val mPath : String = Environment.getExternalStorageDirectory().toString().toString().toString() + "/" + formattedTimestamp + ".jpg" // image naming and path to include sd card appending name you choose for file val mPath: String = Environment.getExternalStorageDirectory().toString().toString() + "/mobile/" +...

Unresolved reference: getInstance [kotlin android studio] getInstance of kotlin is showing error as "Unresolved reference: getInstance" in MainActivity.kt. I am trying to implement singleton but getInstance is not working. Maybe something wrong in this line "MySingleton.getInstance(this).addToRequestQueue(jsonObjectRequest)" in MainActivity.kt. MainActivity.kt package com.example.newstube import androidx.appcompat.app.AppCompatActivity import android.os.Bundle import android.widget.Toast import androidx.recyclerview.widget.LinearLayoutManager...

Set type of a variable dynamically in kotlin I'm trying to make a generic model in which some fields are fixed and only one field changes, so the model is class APIResponse( var msg: String? = null, var code: String? = null, var data: Any? = null // dynamic field ) I want to set data variable of this APIResponse class to other different types on the go with the help of a function: fun generateApiResponseAdapter(type: Any): APIResponse { return APIResponse(null, null, type) } so for example if I have a model as: class...

Sort a file with a specific line pattern in Python Given a file with the following content: enum class Fruits(id: String) { BANANA(id = "banana"), LEMON(id = "lemon"), DRAGON_FRUIT(id = "dragonFruit"), APPLE(id = "apple"); } I want to sort this file given the pattern "id = ", and then replace these lines with the new sorted lines. I wrote a piece of code in python that sorts the whole file, but I'm struggling with regex to read/find the pattern so I can sort it. My python script: import re fruitsFile =...

Kotlin firebase executed with addOnSuccessListener even if fails I have this piece of code and it is executed with .continueWith and addOnSuccessListener even if failed.I try with continueWithTask but i dont understand very well Tasks API. Please help me to understand how to do this. db.collection(customGameName).document().get().continueWith { if (!gameslist.contains(customGameName)) { gameslist.add(customGameName) SavedPreference.setGamesList(this, gameslist) adapter.notifyDataSetChanged() }else{...

Start time gets updated every-time app is launch Requirement - App needs to be logged out everyday at specific time irrespective of whether app is in background or foregound. Solution - Run a snippet every day to logout user from the app. WorkManager has periodic work with initial delay which can be set at specific time and runs periodically. Issue - schedule_requested_at is updated every time app is launched available under WorkSpec table. Though initial_delay remains the same. Used App Inspection to view Database. Same can be visible...

Kotlin Google MLKIT Face Detection , Face Circular Motion Enrollment I was building a face enrollment feature using google's mlkit, I am trying to capture circular motion enrollment like that of ios as shown below I was able to achieve everything but i am only stuck in the circular motion part, what I have used is the following private fun Direction(): Boolean { if (angley in 20f..25f && anglez in 2.0f..6.0f) { return true } return false }...

How to get Twitter data without using APİ in Kotlin? I want to build an Android app using Twitter data such as followers and likes of an account. First i tried to use official Twitter api but because of the limitations (set by Twitter) it was not good for me to use Twitter api in an Android app. I understand that Twitter needs to have some limitations to keep their database not busy. Than, i tried to use jsoup library to scrape data from Twitter. I was not able to get any data (i am not sure if i used jsoup correctly) Is there any way i could...

Firestore keeps on sorting on two fields, but I only want to sort on one field I have a collection "records". A record is just a time set by a user when they clear a puzzle. Record has the fields: uid (id of the user who set the record) time (time taken to finish) type (either "memory" or "word" which are the two types of puzzles that a user can clear) I just want to sort the records by time to show a leaderboards screen. db.collection("records") .whereEqualTo("type", "memory") .orderBy("time", Query.Direction.ASCENDING) For some reason, the results are always...

Register issue with login system in Kotlin On Login page and when pressing register, it takes you to register, but when clicking on register button on register page, it adds user to database regardless if info is provided or not and then takes you back to login page. I want the validation to happen before the execution. Currently it does validate, but executes regardless. Please advise. import android.content.ContentValues import android.content.Intent import android.os.Bundle import android.text.Editable import...

Find max characters can fit in one line of Android Jetpack compose Text I want to find the total number of characters that can fit in one line of a current Jetpack compose Text Any field where I can get this information. Thanks

Kafka TestContainers fails to connect I have a very simple TestContainers Kafka + Kotlin test that fails because my test code cannot connect to the Kafka instance. My Class def looks like this: @Testcontainers class SimpleKafkaTest { @Container val kafkaContainer = KafkaContainer(DockerImageName.parse("confluentinc/cp-kafka:6.2.1")).withEmbeddedZookeeper().waitingFor( Wait.forListeningPort()) Now my test beings as follows: @Test internal fun `test kafka`() { kafkaContainer.start()...

How do I write Nested Generics in Kotlin's Sealed Classes I'm trying to come up with a data model that allows me to do the following: Define a type of Task and change its Status This Status can be either InProgress or Completed In the case of a completed Status, I want to be able to add data, that is specific to the Task that was completed. Initially, I came up with this data model: sealed class Task { abstract val status: TaskStatus data class A( val data: String, override val status: TaskStatus, ) : Task()...

Getting build issue while building kotlin code. "Unresolved reference: datetime in kotlin " The Complete error is Execution failed for task ':compileKotlinJs'. Compilation error. See log for more details Unresolved reference: datetime this issue is coming when I do "import kotlinx.datetime.Clock" and i have implemented implementation("org.jetbrains.kotlinx:kotlinx-datetime:0.1.1"). Can someone help ?

How to initiate array items using for loop in Kotlin Python allows programmers to perform such an operation: mylist = [1, 2] items = [value * 2 for value in namelist] How can I achieve the same using Kotlin, I want to pass values multiplied by 2 from mylist into the array below: val mylist = mutableListOf(1, 2) val (first, second) = arrayOf( ) Kotlin allows us to to declare and initiate variables with one liners as below val (first, second) = arrayOf(1, 2) that way you can call first or second as a variable. Am trying to make the equal part...

Android DiffUtil Doesn't Notify Properly I was following along the Android Room With a View tutorial. The tutorial makes use of DiffUtil to compute changes in the list and update the RecyclerView accordingly. However, when removing or adding items to the RecyclerView, DiffUtil always causes the entire RecyclerView to reload, instead of calling the correct notifyItemRemoved or notifyItemInserted. My Adapter: class...

How to call a companion object list in the activity using its name? I am trying to call a companion object list(present in other file) using the name of the list that is present in the spinner. here is spinner code:- private fun selectcourseCheckboxes() { val courseList: Array = resources.getStringArray(R.array.courses) val courseListAdapter = ArrayAdapter(this, R.layout.support_simple_spinner_dropdown_item, courseList) courses_spinner_quiz_location.adapter = courseListAdapter courses_spinner_quiz_location.onItemSelectedListener =...

RxJava show Loading when http request takes more than given amount of time Problem: Recently a design team on a project I'm working on came up with an idea to show loading states only when http request takes more than two seconds to complete. I wanted to go for a reusable piece of code and I created an extension. My approach: Let's say we have 2 seconds delay time after which loading should appear on the screen. In case I get the successful response quicker than 2 seconds, takeUntil completes when condition is satisfied. Loading is not emitted. In case successful...

User Defined Base URL With Retrofit The application I work on must use a different Base URL for every user. Basically the user has his own server, and in the application he must specify the IP Address for his server in a Text Field so the application can start doing HTTP Requests to that server. When I create the Retrofit instance it requires a Base URL, but there is now way I can access it from the UI, since the user has to enter the base URL manually from a Text Field. As a workaround I just pass Google as the Base URL when I...

Null pointer Exception in Android when using Glide Here is the logcat output 2022-06-20 13:19:27.605 20830-20830/com.example.moveapplication E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.moveapplication, PID: 20830 java.lang.NullPointerException: Argument must not be null at com.bumptech.glide.util.Preconditions.checkNotNull(Preconditions.java:29) at com.bumptech.glide.util.Preconditions.checkNotNull(Preconditions.java:23) at com.bumptech.glide.RequestBuilder.into(RequestBuilder.java:768) at...

Sending a form urlencoded POST request with Ktor Client? I am wanting to utilize the Ktor client library to interact with a Web API, specifically to authenticate via OAuth, and I'm running into trouble attempting to send a form urlencoded POST request properly. It would appear the actual body is not being sent for some reason. I've tried looking at similar questions on SO, such as <a href="https://stackoverflow.com/questions/53595544/send-application-x-www-form-urlencoded-in-ktor">this...

Is sequence referred to internal DSL in Kotlin? In book 'Kotlin in Action', it says Kotlin DSL structure is most commonly created through chained method calls. Also, a typical library consists of many methods and no context is maintained btw one call and the next. I'm confused of which side sequence is close to. Before I read this, I've thought sequence is just API of library, but it really fits with feature of DSL.

convert kotlin/java set to scala immutable Id like to convert an existing kotlin/java set, to scala immutable set, using kotlin/java code. scala.collection.JavaConversions.asScalaSet only gives me the mutable set. Must do it that way, because I am inheriting from a scala class on another repo, and would not like to insert scala packages and plugins to my project.

Android, how to implement an amoled theme over night mode I am making a simple app in kotlin and would like to add an additional option for night mode like this I was thinking of adding a style and applying it programmatically, But I don't know how to do it properly. Here's my code: MainActivity override fun onCreate(savedInstanceState: Bundle?) { WindowCompat.setDecorFitsSystemWindows(window, false)...

Navigation action/destination ,action_OTPFragment_to_confirmOTPFragment cannot be found from the current destination Destination This is the error in log cat I got error when click on submit button while navigating from from OTP to confirmOTP with Arguments

Android camera intent not working in version 12 The camera does not open in android version 12, what can I do for it?

What am I missing while fetching the data for caching purpose using Retrofit that it gives me 504 Unsatisfiable Request I am trying to implement cache request using Retrofit by fetching random joke from an API and displaying it in Textview but when I click the button it keeps giving me '504 Unsatisfiable Request(only-if-cached). Base url of my API is following one:- api and following are the classes. APIService.java import com.example.cachingretrofit.JokeResponse import retrofit2.http.GET import io.reactivex.rxjava3.core.Observable...

How to transform the Array of object to an object in Kotlin I have a list of object Ftemp(Wert_1_id='I130320', Wert_2_id='I130278', Wert_3_id='I130115') Ftemp(Wert_1_id='I130320', Wert_2_id='I130278', Wert_3_id='I130108') Ftemp(Wert_1_id='I130320', Wert_2_id='I130278', Wert_3_id='I130110') Ftemp(Wert_1_id='I130320', Wert_2_id='I130106', Wert_3_id='I130271') and want to transform the list to an object. Like "cat": [ { "id_": "I130320", "children": [ { "id_": "I130278", "children": [ {...