Hi guys I need help are there any better way to refactor this code ? It's repository pattern, so i check data from db first if there is empty then fetch from network cache it and fetch the data from db and then return it if there is found just return it. so are there any better way to implement this ?

override fun findUserByUsername(username: String): Flow<Resource<List<UserEntity>>> =
        localDataSource.findUserByUsername(username).map { fromDb ->
            when (fromDb) {
                is FromDb.Empty -> {
                    when (val fromNetwork = remoteDataSource.findUsersByUsername(username)) {
                        is FromNetwork.Error -> Resource.Error(fromNetwork.message)
                        is FromNetwork.Success -> {
                            val userCache = fromNetwork.data.map { it.toEntity() }

                            localDataSource.insertUsers(userCache)

                            var userFromDb: Resource<List<UserEntity>> = Resource.Loading()
                            
                            localDataSource.findUserByUsername(username).collect {
                                userFromDb = when (it) {
                                    is FromDb.Empty -> Resource.Error(it.message)
                                    is FromDb.Success -> Resource.Success(it.data)
                                }
                            }
                            
                            userFromDb
                        }
                    }
                }
                is FromDb.Success -> Resource.Success(fromDb.data)
            }
        }.onStart {
            Resource.Loading<List<UserEntity>>()
        }.flowOn(dispatcher)

Hi Guys, Any clues on how to handle com.squareup.moshi.JsonDataException to show an error message to the user without crashing the app unexpectedly. I don't have control over the API response so need to handle this gracefully and let the user know the app isn't compatible with the backend. I'm using Retrofit + OKHttp + Moshi. Any help is appreciated. Thanks.

FATAL EXCEPTION: DefaultDispatcher-worker-3
    Process: com.myapp, PID: 18030
    com.squareup.moshi.JsonDataException: Required value 'fakeParam' missing at $
        at com.squareup.moshi.internal.Util.missingProperty(Util.java:660)
        at com.myapp.data.models.DeviceInformationJsonAdapter.fromJson(DeviceInformationJsonAdapter.kt:109)
        at com.myapp.DeviceInformationJsonAdapter.fromJson(DeviceInformationJsonAdapter.kt:22)
        at com.squareup.moshi.internal.NullSafeJsonAdapter.fromJson(NullSafeJsonAdapter.java:41)
        at com.squareup.moshi.JsonAdapter$2.fromJson(JsonAdapter.java:205)
        at retrofit2.converter.moshi.MoshiResponseBodyConverter.convert(MoshiResponseBodyConverter.java:45)
        at retrofit2.converter.moshi.MoshiResponseBodyConverter.convert(MoshiResponseBodyConverter.java:27)
        at retrofit2.OkHttpCall.parseResponse(OkHttpCall.java:225)
        at retrofit2.OkHttpCall$1.onResponse(OkHttpCall.java:121)
        at okhttp3.internal.connection.RealCall$AsyncCall.run(RealCall.kt:519)

Anyone here who works with DigitalOcean Spaces? Currently trying to figure out how to upload images from device storage to my spaces. In all the tutorials I find they put their spaces-key and spaces-secret-key INSIDE the code which is then visible for everyone who decompiles the app 😅 I need a secure way

Hello, anyone can create an Iterator to iterate over java.LocalTime without creating an infinite loop? I have this but this is looping forever... 😄

class TimeIterator(
    startTime: LocalTime,
    private val endTimeInclusive: LocalTime,
    private val stepMinutes: Long,
) : Iterator<LocalTime> {

    private var currentTime = startTime

    override fun hasNext(): Boolean {
        return currentTime <= endTimeInclusive
    }

    override fun next(): LocalTime {
        val next = currentTime
        currentTime = currentTime.plusMinutes(stepMinutes)
        return next
    }
}

Hey I am working in android kotlin. I have one base class and three child class which are inherited by base class. Shape.kt

open class Shape {
    var data : List<Shape> = emptyList()
}

Three child class which are inherited through Shape class called Circle, Rectangle, Triangle. I create a variable called

val shape = Shape()

Hi Guys, I got an interesting question about jetpack compose margin. As we can implement margin using padding or *Spacer*; Is it better to use padding instead? I said that because I now each composable is passed through compose, layout, drawing steps and I thought setting padding is just done on layout phase of that composable but Spacer will be passed in 3 phases separately. And Spacer creates extra Layout. Am I right?! #kotlin #compose

hello everyone, does anyone knows how could i parse this date string: "2019-08-16 22:16:46.919688+00" to a dd/mm/yyyy format?

Hey I am working in reyclerview. I want to fill children width with my screen. Does anyknow how to solve this in reyclerview in android.

I supposed this is a Kotlin general question, but I just use it for Android so... Coming from Python and other environments, I've tended to prefer explicit this/self for variable/method reference. We had an interesting bug today. Here's a method:

fun drop() {
   Plan.modifyRegistry { registry ->
      registry.filterKeys { oid -> oid != this.oid }
   }
   MCCommand.planDrop.oid(oid).sendToMC()
}

Plan objects have an

oid

instance variable, and store themselves in a mini companion singleton. I'm sure there are all kinds of counter suggestions for this architecture. I'm hoping we can leave those aside. Recently, I decided to when-in-rome... and try to embrace implicit this. I let someone go through and "clean up" all of the redundant this's. And so this code got changed:

fun drop() {
   Plan.modifyRegistry { registry ->
      registry.filterKeys { oid -> oid != oid }
   }
   MCCommand.planDrop.oid(oid).sendToMC()
}

And suddenly the

drop

method went from removing itself, to cleaning the whole registry. I'm not sure what the point is, but I guess I'm surprised that the way that Kotlin plays fast and furious with variable name bindings doesn't cause others more issues like this. It certainly makes it harder for me to want to let go of explicit this.

#OT i need some help to use room automigration, is there some other dedicated android community ? i know here we are in kotlinlang.. so.. i. am sorry for OT

Hi all. Who know, what profit i have if i add new line in the end file ? I see this setting but I don’t know if I need it ?

Hey I working in kotlin android. The string is coming from server and it might be contains digit, character, empty string or null value. I want to convert that value in double because I want to compare value. So is there any better way to check that string only contain digit value and not empty or null in a kotlin way. The list is huge so I want a efficient way. Price.kt

data class Price(
  var value: String? = null
)

main.kt

val defaultValue : Double = 4.23
val list = listOf(Price("2.33"), Price("fr23"), Price(""), Price(null), Price("4.23"), Price("12.23"))

list.forEach{
   if(it == defaultValue){
      println("Found It")
   }
}

Hi guys. Which your prefer way to invoke higher-order function, and why? Thanks

fun hello(block: (String) -> Unit) {

//1. block()

//2  block.invoke()

}

Kotlin syntax

I am reading sample Clean Architecture code of Fernando Cejas. He implement as the images, how you think about this approach ? The pros: We can invoke the interface/abstract class which has been injected like a function call Ref

Hi, I recently wrote a backend with ktor, now I'm running it locally on http://localhost:8080 and trying to call it with retrofit, but I'm getting

failed to connect to localhost/127.0.0.1:8080

when usins "http://localhost:8080" as the base URL. How do I setup the thing?

Hi there Does any one know is there a lib/tool for "Generate screenshot with both dark and light theme for android app"

Hey, my project was running fine in android studio but now Gradle task :

Execution failed for task ':buildSrc:compileKotlin'.

with the following stack trace. I have matched the Kotlin version in the IDE with the project, what can cause this?

I get inconsistent values from ViewModel when I use it in another activity. Why is that? For example, I increment a value in ViewModel in activity 1 and I always get the value 0 in activity 2.

Is there any benefit of using

src/kotlin

instead of

src/java

? Or doesn’t it matter? Just a matter of style…?!

I got a unsolved problem about Compose Navigation about nested navigation. Please help me if you know the best practice for nested navigation in compose https://stackoverflow.com/questions/71410351/jetpack-compose-nested-navigation-and-bottomappbar

Hey Guys, I have string which is coming from server.

val string = "2.2"

I want to show in textview like

2.2

. But if my string is

2.00

it will show

2

in my textview. How can I do this in kotlin efficient way?

Howdy! Can anyone help me explaining why is this happening:

fun fact(): Observable<Any> = Observable.just(false)
        .distinctUntilChanged() // fails compilation

vs

fun fact(): Observable<Any> = Observable.just(false)
        //.distinctUntilChanged() // compiles just fine

hi guys I have setup hilt two files at package name level for @HiltAndroidApp notation and MainActivity kotlin file with @AndroidEntryPoint notation. The app builds in android studio well but when I test it on device the app crashed when I remove the @AndroidEntryPoint notation from MainActivity kotlin file the app does not crash when tested on the physical device. What is the issue here

hey I was wondering why is a basic empty project for jetpack compose builds a big size apk compared to traditional XML app

Does anyone know how you could create a custom lint rule that would fail if it catches a certain function/function name being used anywhere outside a specified file?

Hi anyone can save me here. This is working

DecimalFormat.getIntegerInstance(new Locale("ar")).format(number);

But this is not working

DecimalFormat.getIntegerInstance(new Locale("bn")).format(number);

I can see

arabic

number properly but for

bangla

its not working

Trying to follow the guidance of treating events/effects as state https://developer.android.com/jetpack/guide/ui-layer/events#views_1 For some things where you need to be truly imperative with views, such as

webView.goBackward()/webView.goForward()

, how do you encode them as state? They’re very event-like and need to happen just once given certain conditions, and could get complicated when state objects are `data class`es and you use

.copy

to update parts of state. More in 🧵

Are prople seeing the coroutines Debugger option in the latest version of Android Studio Dolphin ?

I know there are a few of naming conventions for functions in compose. But is there any naming conventions I should follow for naming packages in compose