Is this normal behavior for a Jetpack Compose app when opening and closing a keyboard? It happens on my main app on a dark theme (white background flashing) and then this is an app with just MainActivity.kt not kotlin but kotlin colored

How could I convert all column names in a dataframe to snake_case?

Hi guys, Ran into a problem with request timeout with ktor client when downloading big files with slow internet speed. I have these timeouts set:

val httpClient = HttpClient(OkHttp) {
    install(HttpTimeout) {
        requestTimeoutMillis = 15000 // 15 seconds
        connectTimeoutMillis = 15000 // 15 seconds
        socketTimeoutMillis = 300000 // 5 minutes
    }
}

The way I receive it is pretty much the same as described in ktor client documentation here:

logger.debug("Downloading `$resourcePath` of size $length")

val output = FileOutputStream(fileToUpdate, true)
httpClient.prepareGet(url) {
    header("Authorization", "Bearer $SLAVE_TOKEN")
}.execute { httpResponse ->
    val channel: ByteReadChannel = httpResponse.body()
    while (!channel.isClosedForRead) {
        val packet = channel.readRemaining(DEFAULT_BUFFER_SIZE.toLong())
        while (!packet.isEmpty) {
            val bytes = packet.readBytes()
            output.write(bytes)
        }
    }
}

With big files I get this:

[DEBUG] 2023-06-25 17:51:54.678 [DefaultDispatcher-worker-83]: Downloading `clients/techno_magic/mods/netherlicious-3.0.2.jar` of size 98916964
[ERROR] 2023-06-25 17:52:09.799 [DefaultDispatcher-worker-31]: Failed to download `clients/techno_magic/mods/netherlicious-3.0.2.jar`
io.ktor.client.plugins.HttpRequestTimeoutException: Request timeout has expired [url=<http://example.com/api/resource/clients/techno_magic/mods/netherlicious-3.0.2.jar>, request_timeout=15000 ms]

I may be wrong or miss understand something, but shouldn't sequential reading prevent the request timeout? For me it feels like this kind of timeout should come out when a server is not responding at all, but if you are actively receiving bytes, then why is it considered a timeout? In theory, I could slap a huge number and call it a day, but this feels wrong and unreliable. Is there a more appropriate way to solve that? p.s. I have tried "range" requests but with too big blocks they don't solve anything, as a user with 20kb/s speed would still fail to download 1MB block, and with smaller blocks(like 64kb) application is making a whole lot more requests(like +1500 requests for a 100MB file) and for those with good bandwidth will download files for 5 minutes instead of 20 seconds as before.

I'm having trouble accessing optional columns from multiple left joins. Calling

ResultRow.hasValue

for the joined columns always returns

true

, which makes it difficult for me to tell which optional columns are actually present. Below is a contrived example, followed by a passing and a failing test. It should illustrate my problem better than my explanation. Am I doing this completely wrong?

object BaseUser: IntIdTable("base_users")
object SuperUser: IntIdTable("super_users") {
    val baseId = reference("base_id", BaseUser)
    val name = varchar("name", 128)
}
object NormalUser: IntIdTable("normal_users") {
    val baseId = reference("base_id", BaseUser)
    val name = varchar("name", 128)
}

fun Transaction.getUserName(baseId: EntityID<Int>): String? {
    val row = BaseUser
        .leftJoin(SuperUser, {SuperUser.baseId}, {BaseUser.id})
        .leftJoin(NormalUser, {NormalUser.baseId}, {BaseUser.id})
        .slice(NormalUser.name, SuperUser.name)
        .select { BaseUser.id eq baseId }
        .firstOrNull()

    return when {
        row == null -> null
        row.hasValue(NormalUser.name) -> row[NormalUser.name]  // Still enters here even for SuperUser
        row.hasValue(SuperUser.name) -> row[SuperUser.name]
        else -> null
    }
}

@Test
fun `navigate subtype relationship`() {
    transaction {
        SchemaUtils.create(BaseUser, SuperUser, NormalUser)

        val baseUserId1 = BaseUser.insertAndGetId {}
        val baseUserId2 = BaseUser.insertAndGetId {}

        NormalUser.insert {
            it[baseId] = baseUserId1
            it[name] = "normaldude"
        }
        SuperUser.insert {
            it[baseId] = baseUserId2
            it[name] = "superdude"
        }

        getUserName(baseUserId1) shouldBe "normaldude" // PASS
        getUserName(baseUserId2) shouldBe "superdude" // FAIL; was actually null
    }
}

Given a

LocalDate

, how do I format it as a localized string?

java.time.LocalDate()

has a

format()

method, but the kotlinx version doesn't, and so far my google searches are unsuccessful.

Hi, guys. Is there a way to merge two org.json.JSONObject using Kotlin? I’ve already googled it, but it was unsuccessfully. Maybe someone has an approach for that? Thanks in advance.

Hi, is anyone else getting a lot of warnings in their iOS build after updating from Kotlin 1.7.10 to 1.7.20? In both Xcode 14.0 & 14.1b3, simulator or device, our build is totally cluttered with over 3,000 warnings in the format

(arm64) could not find object file symbol for symbol ...

after changing version. Seems like most relate to iOS code written in Kotlin, or 3rd party dependencies (Okio, SQLDelight, Koin, Apollo, NSExceptionKt).

When observing

lazyListState.layoutInfo.visibleItemsInfo

, it’s only forward-looking like

///////// first visible index=3 o=448
item= index=3 offset=-448 height=589
item= index=4 offset=141 height=571
item= index=5 offset=712 height=153

granted, it

firstVisibleItemIndex

starts from 0, so, I could cache these height values, to then calculate actual scroll position, which is what I’m after Question is, where would I cache such values? something to the effect of

val info = listState.layoutInfo.visibleItemsInfo
val cache = Array(size = info.size) { 0 }
info.forEach {
    cache[it.index] = it.size
}

would a simple

remember

be enough?

I'm getting a

ViewModel has no zero argument constructor

error when trying to construct a hilt view model in a compose function. Anyone else experiencing this? I'm not using the jetpack navigation component, just trying to inject a view model scoped to LocalViewModelStoreOwner.current. I get this error when trying to inject even a simple class with no sub-dependencies. My view model is provided like this:

viewModel: MyViewModel = viewModel()

, and I'm using the @HiltViewModel annotation on my view model. My activity and application all support hilt injection properly. I'm using the "androidx.lifecycle:lifecycle-viewmodel-compose" dependency for creating my view model. Let me know if you need more information. Edit: this also only happens when trying to create the view model with any injected dependencies. If the view model has no dependencies, it works fine. The

hiltViewModel()

is only supposed to be used with the navigation component, which I am not using. I am using an alternate navigation library (this one: https://github.com/olshevski/compose-navigation-reimagined), but from my understanding, it sets the LocalViewModelStoreOwner properly, and that's what the

viewModel()

function uses. I'm assuming it's something to do with the view model factory.

Been playing around after seeing iOS's TipKit. Android meet TipKit