Kotlin Questions

I'm making an android app using kotlin with firebase products. i have successful connections with firestore and can successfully retrieve the data

The objective: update firebase realtime database from an android device. my data structure simplified:

I have a folder on firebase. which named 'item'. 'item' contains 100 images. i just want to fetch just all images url in the list. i

I am trying to use pagination by using document snapshot to define the query cursor. when to fragment is opened for the first time, in

I'm working on a kotlin app. it requires me to create my custom data type (user.item) that represents an item. i'm using a mutable list to work

I am using kotlin to build a basic an account creation form through firebase, and for some reason my variables are not being recognized and i

I have a tabbed scrolling activity with several fragments as follows: com.example.myapp ui.main

I have this function that tries to call a method in an android activity using the below firebase addchildevent listener but i get a "nullpointer"

I have an android kotlin application fragment with three elements in the resource layout:

I have a project where i need to write a data along with an image i.e to both cloud storage and firestore

I'm trying to get an information ('firstdate') saved in firebase using this code: if(currentuser != null){ val ref =

Everything looks good. need help in finding a mistake in code. by the logs that is the snapshot from firebase datasnapshot

Currently i am working on a running tracker app for android phones. for this i will make a follower part also and a news feed. my question

I am trying to connect my app with firebase so i added classpath, implementation and "apply plugin" to my graddle files

When i created join action and login action on android app, aa problem has occurred. working with mvp pattern in login action. but the results on

In javascript, you can start two (or more) asynchronous tasks simultaneously, wait both of them to finish and then do something/continue:

I'm building the registration activity in which i use a textwatcher to see if email or password are empty, if all is correct is supposed to go

I am trying to use a scanned barcode as a variable in a sql query. i am using the google ml kit

I have this method in my controller (this is a kotlin method, but i think you can understand it): open fun getais(

I use camerax to capture an image from the camera using

Following is the code i use to pull the data out from the firestore. however, as part of the development of the app, my requirement

Im trying to create an app with a recyclerview, and i am trying to figure out the following code from an android example. like what is the onclick

I'm writing the following nested function where dfsvisit uses the arrays "numcaminos" and "colores" declared in the outer

I created a quotes app, using an api to call the quotes, using retrofit, and now i want the app to have the option of translating all to

Kotlin newbie here -- is there a "neater" way to do this? (my int values are guaranteed unique across the entire set) fun

I am refactoring applications that pass "application context" to the view model factory and is accessed in the view model. is there a

I want to enable a button if checkbox is selected or checked and disable it if unselected or unchecked. i started all my application using kotlin.

I am writing unit test for my viewmodel when i run test i am getting following exception lateinit property apiinterface has not

I have a horizonalpager but there is no animation means it goes to second page suddenly i want that it animates to go softly or little bit slow

Hey i am learning atomic integer in kotlin. i want to know is there atomic integer swap value if current value is smaller than new value. for

I'm trying to install this library

I've added @pattern annotation to a query parameter in my rest controller (springboot kotlin). i would like the regex in the pattern to accept

I have an abstract class image filter: abstract class imagefilter { internal abstract val size: int fun

I have a map containing the keys of my firebase realtime database and want to retrieve the corresponding key data and put it in the result data

I have a firebase database that looks like this

I am from the c# world and am taking my first steps in the kotlin/android environment. i am a bit spoiled by the mvvm binding in c# and

I need to make a lot of api calls asynchronously and obviously make sure that they all pass so i can handle error/success in a single place.

I am really new to kotlin and since i'm not used with the terminology i haven't found anywhere how can i get an object from an event caller.

I want to adust my imageview like this:

In jetpack compose, if i have a mutablestate variable, i can expose it's state as "read-only" value to

I need to fill an 8x8 matrix just with 0. i know it is possible to do the following: board = arrayof(

I have a screen which have 2 edit text one edit text shows hour and other shows minute

I have come across an interesting coroutines freeze that i have simplified into the following problem: //running on main thread

I'm trying to create something similar to the picture. i am using coordinatorlayout, bottomappbar and

The error in "adapter = useradapter(users)" says type mismatch required: context "change parameter context type of primary

So i was trying to get my fragments with navigation component to work, but for some reason i'm getting that exception. i already searched for some

I have write a code for a tic tac toe game with android studio, kotlin. according to some of youtube videos the logic is ok but after running the

As far as i understood, each part of code which is related to any state will be changed(recomposed) with state changes → and each state

Imagine i have a topappbar (1) like

I wanted to do a small popup window (dialog box) with textinputlayout, textview and button. the thing is i

I want to observe data inside my fragment from viewmodel, but android studio keeps triggering this warning. can someone help with this problem?

I am very new to kotlin multiplatform mobile and tryed to start with appcode and the kmm plugin. creating and running the project on android

I know it's a silly quastion but when calling a string from resources(r.string.xxx), are there any ways to call an string name using

I am developing an app and i should open the "documents" folder of the directory of my app using the google files app (presumably using

I'm learning firebase cloud messaging. i've implemented it in app run notification, but it seems that doesn't work. the problem is that, when i

Clickabletext will return position of clicked character but is it possible to make each word clickable and return it? @composable

My composable is recomposing endlessly after flow collect and navigating to a new screen. i can't understand why. i'm using firebase for

I'm not allowed to change the tointornull() and i need to reject every string, float, and negative input. i tried to do it with

I created a kotlin mobile app. in my app i use the recyclerview with adapter. i want to changing the background color of item

Code from readme.md val scarletinstance = scarlet.builder() .websocketfactory(okhttpclient.newwebsocketfactory(gdax_url))

I have a requirement where in i need to query all documents with a field that can match any of the values inside a long list of strings.

I can get any type from my firestore

Running into an error i have been researching and attempting to fix for the past couple weeks. there are tons of suggestions out there and i've

I understood that chirp use 16khz-mono protocol for transmitter data in android. can i switch kind of protocol that i prepared to work with? and

I have the following problem: i started to study dagger 2 and trying to add injections to my app class. here's the code of my app class:

I'm trying to get livedata from room. so my recycleview can have live updates if anything in database is changed i have tried with out

I cannot think how to inject network module.i try and find many way to inject network module in dagger 2.but i cannot solve this.please help

I am using a recyclerview to show images / videos from sdcard, like a gallery app & recently i migrated to kotlin and tried using

I got some errors in my application and found this solution: click now,

I have the following code using coroutine to perform network fetching on background try { networkjob =

What is viewmodelfactory and when and why should i use it i am new to android and actually i can't understand these concepts in mvvm

System services not available to activities before oncreate() i have dialog class mypersonaldialog(mcontext: context) and this dialog

I have the following code to get the current system memory: val memclass = (context.getsystemservice(context.activity_service) as

This is my first time learning to implement custom android themes, i don't understand my styles.xml code much. i want to set the

I've been trying to get the output of a command for quite some hours now but with no result. having this code: val bytearry =

I have a verify email activity - "we send email to.." and so on. i want to create "onemailverifiedlistener" by starting the thread in this

I am trying to update email of user in my android app. and everything works fine if the new email is available. when it isn't - onfailurelistener

I'm working with drawerlayout in my program, and my program has only one activity, and many fragments. when i open new fragment how can i block

Can anyone help with refactoring this class to kotlin, having trouble with generics conversation. model: abstract class

I have hashmap < integer,string> of length 3: 1=>"value1" 2=>"value2" 3=>"value3" now i want to

I'm having a problem when dealing with multiple navhosts. this issue is very similar to the one asked

I am learning kotlin. as per i learnt, extension functions provides the ability to extend a class with new functionality without having to inherit

I have a kotlin project that i need to convert in java. i don't know if it is possible in android studio ? can the kotlin's logics be converted in

Currently i tried to use diffutil to notify the items of recyclerview in my project. meanwhile, i wrote a custom adapter which could add

Is okhttp 4.0.0 intentionally incompatible with jvm target 1.6? upgrading from okhttp 3.12.0 to 4.0.0 i run into the following build failure.

I'm creating an app that want to get some url at the time of execution on the app layout folder. how can i get the url on the application run to

I have a data class called model, data class model(var name: string? = null, var address: string? =

I have an interface, interface a<in t> { fun onsuccess(response: t) fun onfailure() }

I need to handle error globally in my application for network service, i am using rxjava2calladapterfactory in my retrofit service. so in order to

I am using a sealed class to return data from network. but when i am building the project i am getting the following error

I am making a simple memory game. it basically, some imageview come up and after that user should click imageview

In one of my fragment class, i using invalidateoptionsmenu() as below invalidateoptionsmenu(activity)

I'm trying to create a sequential download service using rxjava. user can add items in batch (20, 30 etc) or individual item. these items will be

I know flow is cold, and

Frankly speaking, i don't have the knowledge to understand and debug this error. so please inform me if i miss something. how am i

I have to send bearer at headers. i saw that i have to add hashmap with values: val headermap = hashmap<string, string>()

The following are two blocks of code that should essentially do the same thing. but the second one does not execute the oneditoraction while the

I am working on a android studio project which is a hybrid of kotlin and java. i am trying to set an onclicklistener to a button, however i keep

I wonder how to bind sqlite fts query params for sanitizing inputs. i was trying to run a raw query like below which ended up with a

I recently migrated my project to androidx using refactor. all the implementations were automatically changed to androidx. but i am not able use