kotlinlang #android

is there a defacto/known way to park network requests when network is not available and make the requests again when network is back? seems like a typical requirement

althaf

10/01/2022, 10:38 AM

Hi, Here the WishesByCategory is a domain model with following definition

data class WishesByCategory(val id: Int, val name: String, val wishes: List<Wish>)

Code below is the from a repository mapper, that maps WishesResponse to the domain model, I'm stuck with the code at 'When' statement, since all the domains models are immutable in my case, i have to make it mutable list explicitly as shown below, however, the follow code doesn't work as each time the loop run it creates fresh list. Final result is that each domain model end up with empty list. Is there a better way to write this code ?

private fun List<WishesRpse>.toWishesByCategory(): List<WishesByCategory> {
    val result: ArrayList<WishesByCategory> = ArrayList()
    val expWbyC =
        WishesByCategory(1, context.getString(R.string.jp_wish_cat_experience), listOf())
    val eventWbyC =
        WishesByCategory(2, context.getString(R.string.jp_wish_cat_events), listOf())
    val serviceWbyC =
        WishesByCategory(3, context.getString(R.string.jp_wish_cat_services), listOf())
    val moblityWbyC =
        WishesByCategory(4, context.getString(R.string.jp_wish_cat_mobility), listOf())
    val othersWbyC =
        WishesByCategory(5, context.getString(R.string.jp_wish_cat_others), listOf())
    forEach {
        when (it.id) {
            in experience ->
                expWbyC.wishes.toMutableList()
            in events ->
                eventWbyC.wishes.toMutableList()
            in service ->
                serviceWbyC.wishes.toMutableList()
            in mobility ->
                moblityWbyC.wishes.toMutableList()
            else -> othersWbyC.wishes.toMutableList()
        }.add(Wish(it.id, it.name))
    }
    listOf<WishesByCategory>(
        expWbyC,
        eventWbyC,
        serviceWbyC,
        moblityWbyC,
        othersWbyC
    ).forEach {
        if (it.wishes.isNotEmpty()) result.add(it)
    }
    return result
}

Mohamed Ibrahim

10/02/2022, 11:03 AM

Any ideas of how to handle product flavors cleanly and neatly?

Eric Womer

10/02/2022, 12:56 PM

What do I need to import inorder to use fun someFun(variable:Dp [<<= this thing here, the Dp])

Eugene Maksymenko

10/02/2022, 8:43 PM

👋 Hello, team! Let me introduce WorldWind Kotlin - the first multi-platform planetary 3D globe library for JS, Android and JVM

Sam

10/03/2022, 3:24 AM

Hi everyone, Do you know any tools or plugin to convert synthetics to view binding? Thanks

Og'abek Tirkashov

10/03/2022, 4:06 AM

👋 Hello, team!

Katarzyna

10/03/2022, 12:02 PM

This time Ngenge Senior shows you how to do Firebase authentication using SMS. ✉️ Find the whole article here: 👇 https://blog.kotlin-academy.com/firebase-phone-authentication-in-jetpack-compose-using-mvvm-architecture-258775059aa7

Sky

10/03/2022, 6:26 PM

Hi guys, i have a post request that returns: { “id”:“unique-id-of-the-new-favourite” } … so im wondering in order to get the return value do i need to create a new Kotlin data class?.. or can i just speicfy a return type…

Ihoby Christian

10/04/2022, 6:56 AM

👋 Hello, team!

Ahmed Sellami

10/04/2022, 8:50 AM

How can I mix these two classes in an observable that handles both normal and one time observation without rewriting the logic? In other words, how can I create a class that somehow extends these two?

open class OneTimeObservable {
    private var isInitialised = false
    var state = false
        set(value) {
            field = value
            isInitialised = true
            if (oneTimeObservers.isNotEmpty()) {
                notifyOneTimeObservers(value)
            }
        }

    private val oneTimeObservers = mutableMapOf<String, (Boolean) -> Unit>()

    fun whenReady(tag: String, listener: (Boolean) -> Unit): Boolean {
        return if (!isInitialised) {
            oneTimeObservers[tag] = listener
            false
        } else {
            listener(state)
            true
        }
    }

    private fun notifyOneTimeObservers(boolean: Boolean) {
        oneTimeObservers.forEach {
            it.value(boolean)
        }
        oneTimeObservers.clear()
    }
}

open class Observable {
    var state = false
        set(value) {
            field = value
            notifyObservers(value)
        }

    private val observers = mutableMapOf<String, (Boolean) -> Unit>()

    fun addObserver(tag: String, observer: (Boolean) -> Unit) {
        observers[tag] = observer
    }

    private fun notifyObservers(boolean: Boolean) {
        observers.forEach {
            it.value(boolean)
        }
    }
}

pablisco

10/04/2022, 5:54 PM

Hey fellow Android Kotliners. I’m working on kopyk.at and I just managed to use it on an Android app. We are looking to have a final RC in a month or so (no warranties, as I may find a job before that). Would look to get some feedback on it if people want to give it a try 🙂 🙏

Naveen

10/06/2022, 5:09 AM

Hello Devs, can anyone help me with this. So I’ve a very famous problem with Navigation Component of fragment recreating when back is pressed, it happens in this case : There are 2 fragments A and B where A is having list of items: 1. Scroll down to bottom of list on A 2. Navigate from A to B 3. Press back button 4. Fragment A state is changed and it’s not at the bottom of the list How can I prevent Fragment A state from getting destroyed and recreated ?

Jan

10/06/2022, 12:32 PM

Hi, I have a question regarding a ColorStateListResource: 1. In my res/color folder I have created a color list selector resource, see https://developer.android.com/guide/topics/resources/color-list-resource 2. Its working fine e.g. on Android 11 3. It crashes e.g. on Android 6.0.1 with: XmlPullParserException: <item> tag requires a 'drawable' attribute ... If I create a drawable list selector under res/drawable its working as well, but thats not what I want. Is that a known issue in some of the jetpack libraries I am using or something else? Thanks ...

Ahmed Sellami

10/06/2022, 1:25 PM

How can I retrieve an item from a list and add it if it does not exist and get its reference again? I guess I can do better than this.

var playedPodcast = playedPodcasts.find {
    it.id == itemToPlay?.id
}
if (playedPodcast == null) {
    playedPodcasts.add(PlayedPodcast(itemToPlay?.id, mutableListOf()))
}
playedPodcast = playedPodcasts.find {
    it.id == itemToPlay?.id
}!!

ilushakr

10/06/2022, 1:53 PM

HI guys mb someone knows is there any way to create two shared modules with KMM project (for example shared and feature) and use it both in ios app via cocoapods(as i undersand via regular frameworks its restricted bc only one searching path)? also if yes can i make one of theese modules dependent from anouther (module feature implements shared)?

Niclas Hjalmarsson

10/07/2022, 9:49 AM

Hi guys I have a question on windowInsets and how it works when the app is no longer in the foreground. For starters I have a full compose app, with just one activity calling

WindowCompat.setDecorFitsSystemWindows(window, false)

to let me draw behind the systembars. So all my compose views (that need it ofc) calls

Modifier.systemBarPadding()

for statusbar and navbar padding, and it works as expected. But I’ve found that calling for example an Intent chooser to pick an app to open like an installed email app, makes the

systemBarPadding()

return 0 and my layout jumps to underneath the status bar. And it’s all very visible since the dialog from the Intent chooser is not covering the entire screen. Any tips on how I can make

systemBarPadding()

keeping it’s value even after the app is not in the foreground anymore? Thanks for any help.

Naresh

10/07/2022, 10:38 AM

could anyone help me to learn about Retrofit API calls in Android from the scratch?

KotlinLeaner

10/07/2022, 11:58 AM

Hi guys, I have two UUID which is

0x1810

0x2A35

. So I am adding value in my btyeArrayof but it giving me error on my side. Please also guide me how can I pass data to scan filters with multiple id.

Abdulaziz Mohammed

10/07/2022, 5:29 PM

what is different between flatmapconcat and flatmaplatest?

Santiago

10/07/2022, 10:48 PM

Hi there. I created a Xamarin Bindings library for a native library I wrote in Kotlin Multiplatform Mobile that depends on ktor. When I launch the Android app that uses this bindings library wrapping the ktor library, I see the following error

Java.Lang.NoClassDefFoundError: Failed resolution of: Lio/ktor/client/engine/okhttp/OkHttp; ---> Java.Lang.ClassNotFoundException: Didn't find class "io.ktor.client.engine.okhttp.OkHttp" on path

I understand I'm missing a dependency on my bindings library / xamarin forms app, but I'm not sure how to proceed. Did anyone try already to use a KMM library with ktor dependency from Xamarin Forms that experienced this error before? Thanks.

Isaac Akakpo

10/08/2022, 6:06 PM

Hello guys.. I created a portfolio site using Jetpack Compose.. check ot out here.. https://develnerd.github.io/

Eric Womer

10/09/2022, 2:13 PM

How do I call a @Composable function from within LiveData's observe method?

Eric Womer

10/09/2022, 2:15 PM

And why can't you overload a method and add @Composable to it?

Eric Womer

10/10/2022, 12:31 AM

Anyone got any suggestions recomendations on video/ or other series on learning coroutines and compose with MVVM in mind?

Sharansalian Dev

10/10/2022, 5:04 AM

Any Android Expert that can help me with this?

https://stackoverflow.com/questions/74010297/create-a-needle-gaugeview-from-ios-swift-to-androidkotlin

Azhar

10/10/2022, 5:57 AM

How can I animated real invoice receipt gif for each item clicking kotlin code

althaf

10/11/2022, 5:07 AM

Hi, there this block is still asking for a return statement, though i'm only able to return from the 'fold' block, any way out of it ?

override suspend fun load(params: LoadParams<Int>): LoadResult<Int, Hotel> {
    val currentPage = params.key ?: pageSetting.page
    hotelSearchRepository.search(
        hotelInquiry,
        page = currentPage,
        itemsPerPage = pageSetting.records
    ).collect { result ->
>>>>>     return@collect  result.fold(onSuccess = { hotelInquiryDetails ->
            Page(
                data = hotelInquiryDetails.hotels,
                prevKey = if (currentPage == STARTING_PAGE_INDEX) null else (currentPage - 1),
                nextKey = if (hotelInquiryDetails.hotels.isEmpty()) null else (currentPage + pageSetting.records)
            )
        }, onFailure = {
            Error<Int, Hotel>(Exception(it))
        })
    }
} <<<<< - Error not return statement

Sergio C.

10/11/2022, 8:36 AM

Hi, Why is Kotlin version 1.7.20 not available in Android Studio to update? Gradle lint suggests the new version but it's not available in the stable channel.

CS_047_HARI OM DWIVEDI

10/11/2022, 7:08 PM

👋 Hello, team!