I’m fairly new to android dev so at the moment basing an architecture on https://github.com/android/nowinandroid

Hi guys, I have a data store preference value named CURRENT_INPUT and I want to pass it to mutableStateFlow as initial value, but I don't know how to do it. Here's the code.

@Singleton
class DataStorePreference  @Inject constructor(@ApplicationContext context: Context) {

    private val dataSource = context.dataStore

    companion object {
        const val CALCULATOR_USER_PREFERENCES = "CALCULATOR_USER_PREFERENCES"
        val CURRENT_INPUT = stringPreferencesKey("CURRENT_INPUT")
    }

    suspend fun <T> getPreference(key: Preferences.Key<T>, defaultValue: T):
            Flow<T> = dataSource.data.catch { exception ->
        if (exception is IOException) {
            emit(emptyPreferences())
        } else {
            throw exception
        }
    }.map { preferences ->
        val result = preferences[key] ?: defaultValue
        result
    }
}

@HiltViewModel
class CalculatorViewModel @Inject constructor(
    private val dataStorePreferenceRepository: DataStorePreferenceRepository
) : ViewModel() {
    // pass CURRENT_INPUT preference value to mutableStateFlow initial value
    private val _currentInput: MutableStateFlow<String?> = MutableStateFlow(null)
    val currentInput =  _currentInput.asStateFlow()

    suspend fun<T> getPreference(key: Preferences.Key<T>, defaultValue : T) =
        dataStorePreferenceRepository.getPreference(key, defaultValue)
}

Huge update of WorldWindKotlin KMP 3D map engine with a lot of bugfixes released! https://github.com/WorldWindEarth/WorldWindKotlin/releases/tag/v1.1.3

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is swipeTorefresh deprecated in jetpack compose and i should replace it with pullrefresh??

hello all. i'm using Room and i have an entity class with 23 properties. the entity's primary key is a natural key that comes from a remote source. my preference would be to use a data class and that only the primary key property participates in the auto-generated

equals()

and

hashCode()

methods. i also would prefer that all properties of the class are immutable, so the class is more like a functional style data type, and i would appreciate having kotlin auto-generate the

copy()

method with the selective override parameters. however, i can't seem to achieve all these things at the same time because if i create the data class with only the primary key property in the primary constructor, Room needs public setters for the rest of the properties, and i will not get the

copy()

method with parameters for all the non-constructor properties. if i put all immutable properties in the primary constructor, i lose the desired

equals()

and

hashCode()

semantics and i also have concerns about the overhead of that many properties participating in those methods. has anyone tried/been able to achieve this with a data class? my current solution is a standard class with all immutable properties in the primary constructor, and a copy constructor that takes a source instance argument, then individual override parameters for all the properties, but that's a bit of headache and error-prone to maintain

The easiest solution will again be separation of concerns. You should create a separate class for each domain it is used for. I.e. the room database data class and then a class that you create where you only have the primary key in the equals and hashcode functions. If you don’t want to do that, you can still override equals and hashCode yourself even on a data class.

New piece of cake from Google itself! Check this out 🤤 https://goo.gle/3Y17KE0

I noticed that when registering

OnPageChangeCallback()

to the

viewPager

like this:

binding.viewPager.registerOnPageChangeCallback(pageChangeListener)

Then, the

onPageSelected()

fun is called immediately, can I prevent this behavior(calling the fun on the first initialized)?

When having

BottomSheet

, I am

not able to have fix footer

, footer just can not be fixed I mean at bottom and behind the footer, I am doing scrolling and things, so how can we achieve that?

You know if I can use Glance widgets on react native ? I don't know where I can any answer

How to implement long polling with retrofit?

How to delay a loop

Like the loop complete too fast

I want some time after each iteration

Can anybody help??

Unable to call input function

Hello , does SaveStateHandle do the same job? So we can use the ViewModel in the last saved state in another screen ??

So I stumbled (yet again) upon a name shadowing issue where I’d like the compiler to warn me that my choice is ambiguous, but I don’t know if this is yet something that the Kotlin compiler supports. Imagine the following code:

import android.os.Bundle
import androidx.fragment.app.DialogFragment
import androidx.fragment.app.Fragment

class OuterFragment : Fragment() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        
        MyDialogFragment.create(Bundle()).apply {
            show(childFragmentManager, "DIALOG")
                // ^--- this should be this@OuterFragment.childFragmentManager
        }
    }
}

class MyDialogFragment : DialogFragment() {
    companion object {
        fun create(bundle: Bundle): MyDialogFragment =
            MyDialogFragment().apply {
                arguments = bundle
            }
    }
}

Any hints how I could make

childFragmentManager

yellowish in the IDE?

I’m trying to send a broadcast command with

ProcessBuilder

. It “works”, but the output is different if I run the same command via terminal:

~ adb shell am broadcast -p com.sample -a sample.action -e "extra" "bla bla"

produces (correctly):

Broadcasting: Intent { act=sample.action flg=0x400000 pkg=com.sample (has extras) }
Broadcast completed: result=0

but the same command via

ProcessBuilder

produces:

Broadcasting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x400000 pkg= -p }
Broadcast completed: result=0

any idea why? 🤔

Anybody face Webview Performance(ANR) issue due to Accessibility Service Enabled ? Particularly it is happening on vertical fast scrolling. If faced then any solution for fixing this?

Hi Guys, Any one with experience with canvas? Im developing a simple real time drawing app. Basically I'm sending trough web socket the path offsets that the user is drawing. And I'm drawing it in the app that is listening. But I'm facing a problem when I draw it on large phone and receive in a small phone, I think is because of pixels difference. So I wanted to know what the approach to make it work correct? eg.:

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Hi, I am trying to develop a library module that only compiles with the androidx fragment library using

compileOnly

as the actual runtime dependency will be provided by a user of the library. This works fine for normal compiling, but compiling the android test class path throws an IR error:

No such enum entry LIBRARY_GROUP_PREFIX

I have tried adding the annotations as an

implementation

and

testCompileOnly

and

androidTestImplementation

dependency but I can't get passed that IR error. Does anyone have a workaround or solution? Thanks!

Questions about verification-metadata.xml/verification metadata error reporting with Android studio and downloaded artifacts. Google doesn't always seem to update the hash files for libraries well (for instance, aapt for windows doesn't seem to have the right hashes right now for one version, but this happens from time to time). I've noticed some kotlin-specific extensions don't always update the hashes reliably as well. I'm assuming this is a very standard thing to happen per my own observed frequencies. It has happened enough with a kotlin extension or two I often skip those at this point and just work off the plain library (which is why this doesn't deserve the :not-kotlin: marker, some of those extensions look great). Is there some standard mechanism to point out these checksum mismatches to teams somewhere I may be unaware of? Am I missing out on some "major/minor" version convention which is the only time these checksums may be correct? Are there any great public key trackers for the OSS kotlin community I should be paying specific attention to (especially related to the seemingly useful but often out of sync kotlin extensions to libraries). Are there other libraries/tools I should be paying specific attention to?

Is there any example on how to work with

kotlinx.parcelize.RawValue

can’t find much.

Is there a way in Kotlin to deal with an encoded String so that the hyperlink address does not appear? Like in this example: "Ministers have rebuffed an offer by nursing unions to suspend <a href="https://www.theguardian.com/society/2022/nov/09/nurses-in-uk-vote-to-go-on-strike-for-first-time-in-dispute-over-pay">planned strikes</a> in return for negotiations on pay". What I would like instead would be "Ministers have rebuffed an offer by nursing unions to suspend planned strikes in return for negotiations on pay".

Can someone tell me if we need to use Dispatcher.IO for DataStore or it already runs in a background thread under the hood like Room does?