kotlinlang #android

this might seem like a silly question, but does anyone know if, using Android Studio (or plain old Gradle) I can isolate Kotlin warnings? the context here is we have an extremely large project with many warnings from both Kotlin and Java, and I’d like to isolate the Kotlin-only warnings. I know I could do this by writing a script to grep only *.kt files, but I figured there might be something built in I can use to do this

hfhbd

06/18/2022, 8:15 AM

Is this behavior expected? I would expect printing

1.8

instead.

plugins {
    kotlin("android") version "1.7.0"
    id("com.android.application") version "7.2.1"
}

android {
    kotlinOptions {
        jvmTarget = "1.8"
    }
}

tasks {
    withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile> {
        println(kotlinOptions.jvmTarget) // prints null
    }
}

yousef shaaban

06/18/2022, 3:21 PM

is there way write transient
final
int

m = 50;

i want to map this line at kotlin Not use

companion object

Rahul Gill

06/19/2022, 3:10 AM

How to keep data stores values in memory for use. Currently I'm having data store values as StateFlow in GlobalScope and then using the values for the api by providing them in lambda

ktoClient(someHeaderValue: ()->String)= HttpClient{
  ...
  defaultConfig{
    header("headerKey", someHeaderValue())
  }
}

Tin Tran

06/20/2022, 2:41 AM

Hi. I’m seeing this crash popping up a lot in my crashlytic board. Does anyone having the same issue? Crash happened mostly in background state

Fatal Exception: java.lang.IllegalStateException: Not implemented
       at androidx.work.CoroutineWorker.getForegroundInfo$suspendImpl(CoroutineWorker.java:100)
       at androidx.work.CoroutineWorker.getForegroundInfo(CoroutineWorker.java:6)
       at androidx.work.CoroutineWorker$getForegroundInfoAsync$1.invokeSuspend(CoroutineWorker.kt:134)
       at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
       at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
       at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.java:571)
       at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:750)
       at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:678)
       at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:665)

My work manager dependency is

implementation 'androidx.hilt:hilt-work:1.0.0'
    kapt 'androidx.hilt:hilt-compiler:1.0.0'
    implementation "androidx.work:work-runtime-ktx:2.7.1"

:not-kotlin: 2

Tim Malseed

06/20/2022, 4:32 AM

Hey friends. We’re looking at hooking into the instrumented tests on Android, to receive realtime progress. We’re able to do this with regular unit tests by attaching a Gradle TestListener. However, instrumented tests don’t use the same Gradle APIs. I’m wondering how Android Studio is able to get realtime test results when running the

connectedDebugAndroidTest

task? We can attach a custom Junit

RunListener

via gradle

testInstrumentationRunnerArguments

- but this passes progress back to the app’s process itself, rather than our local machine.

:not-kotlin: 1

Elnur Jeksenov

06/20/2022, 8:53 AM

Hi guys! I want to disable screen recording in my app(screen capture allowed). As I researched on the internet there is only one solution:

window.setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE)

is there any other solution?

:not-kotlin: 3

Tim Malseed

06/20/2022, 1:30 PM

Are the 'not Kotlin' emojis really necessary? I'm happy to help answer questions loosely related to Android dev in this channel, whether they directly involve Kotlin or not. Surely I'm not the only one? We have an amazing wealth of knowledge here, and it seems a shame to turn questions away just because they don't strictly relate to the language. It seems to me that there's no harm in asking..

🚔 2

:not-kotlin: 5

kotlinforandroid

06/21/2022, 11:50 AM

I want to periodically read the value of the stepcounter sensor using a

androidx.work.Worker

. However, reading the value requires me to register a callback. How do I make my worker wait for the callback to return once without using a busy-loop? Is there a builtin way?

JobService

has a dedicated

finishJob

method that one could call from the callback.

androidx.work

seems to not have this

class MyWorker(sm: SensorManager, sensor: Sensor, context: Context, params: WorkerParameter): Worker(context, params) {
    private flag: Boolean = false

    override fun doWork(): Result {
        sm.registerListener(object : SensorEventListener {
            override fun onSensorEvent(e: SensorEvent) {
                flag = true
                // use value...
            }
        }, sensor, TIMEFRAME_FASTEST)
        
        while (!flag) {  }
        return Result.success()
    }
}

:not-kotlin: 1

samp

06/21/2022, 9:14 PM

Cross posting this question: https://kotlinlang.slack.com/archives/C09222272/p1655845993785259 My problem is related to this stackoverflow question : https://stackoverflow.com/questions/63478955/refactor-my-java-code-to-replace-attribute-access-to-getters-and-setters

:not-kotlin: 2

Satyam G

06/22/2022, 2:08 PM

Hello, I am using the In-App Update feature in Android (Immediate Update). We already have a method of

appUpdateManager.startUpdateFlowForResult(
    info,
    AppUpdateType.IMMEDIATE,
    parentActivity,
    MY_REQUEST_CODE
)

Which triggers the Immediate flow. If you observe here we are passing here the MY_REQUEST_CODE while triggering Update. Once the update is Finished, Cancel we get the callback in OnActivityResult based on that we can take decisions. But we already know onActivityResult is deprecated now and it is recommended to use the Activity Result Api which has a code like

var resultLauncher =
    registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
        if (result.resultCode == Activity.RESULT_OK) {
            // There are no request codes
            val data: Intent? = result.data
            inAppUpdate?.let {
                inAppUpdate?.onActivityResult(result.resultCode, data)
            }
        } else if (result.resultCode == AppCompatActivity.RESULT_CANCELED) {
            finish()
        }
    }

But How to get the request code in this case ??? Can anyone help here ?

:not-kotlin: 2

👋 1

Erwin Pandawa5

06/23/2022, 1:34 AM

message has been deleted

❓ 4

Sven Obser

06/23/2022, 3:09 PM

Hi everyone, I just realized that

kotlin.random.Random

produces the same “random” values with each app start on Android. 😨 Is this expected behavior?

Log.e { "java.util.Random().nextInt(): ${java.util.Random().nextInt()}" }
Log.e { "kotlin.random.Random.nextInt(): ${kotlin.random.Random.nextInt()}" }

Output:

java.util.Random().nextInt(): -1853486751
kotlin.random.Random.nextInt(): -351317653

java.util.Random().nextInt(): 1794921748
kotlin.random.Random.nextInt(): -351317653

java.util.Random().nextInt(): 1849140367
kotlin.random.Random.nextInt(): -351317653

Vivek Modi

06/24/2022, 9:06 AM

Hey guys, I have one string in which I want to split into list from there where I should provide character. I'll explain in details For example 1

val string = "Birth Control"
    
    val searchText = "n"

Output

["Birth Co", "trol"]

For example 2

val string = "Bladder Infection"

    val searchText = "i"

Actual Output

["Bladder ", "nfect", "on"]

Expect Output

["Bladder ", "nfection"]

I tried some code but example 1
is working fine but example 2
is not because I only want to split first occurrence.

val splitList = title?.split(searchText, ignoreCase = true)?.toMutableList()
    splitList?.remove(searchText)

Can someone guide me how to solve this idiomatic way. Thanks

Nurbanu Kahraman

06/24/2022, 10:51 AM

How to stop of android cracked apks?

🤣 1

:not-kotlin: 7

davidbritish

06/24/2022, 9:34 PM

Does anybody know of any documentation detailing kotlin components' Min Api? Especially now with kotlin 1.7's removal of the jvmTarget 1.6 option? Seems like existing documentation is only on Kotlin on Android's FAQ page last updated on 2020, and a Stackoverflow post from 2017.

rkeazor

06/25/2022, 2:20 AM

For those who have Data Classes in public apis. How do you handle Binary and Source Compatibility issues

AmrJyniat

06/25/2022, 5:01 AM

How to reflect a flow value when it gets ready after collecting?

var property: String? = null
.......

propertyFlow.collect{
    property = it
}

.......

textView.text = property // reflect this value when its get ready

Something like that, any idea?

brookmg

06/25/2022, 9:18 AM

Hey guys, this might be a weird question but is there a way to start a tagged co-routine? To be able to cancel batch of them if a parameter is changed. Is dedicated a job for related tasks the only way to do this?

Hannan Shaikh

06/26/2022, 12:34 PM

Hi there, I want to setup Custom Navigation drawer using navigation components, can anyone help me

:not-kotlin: 9

dazza5000

06/27/2022, 6:22 PM

has anyone implemented app idle timeout using kotlin and have an implementation strategy they want to share/highlight?

:not-kotlin: 2

:kotlin-intensifies: 1

Colton Idle

06/28/2022, 2:21 AM

I need to make an api call (suspend function since I use retrofit) in my FirebaseMessagingService. What's the proper way to make a suspend call in an Android service? Does this comment still hold true in 2022? https://stackoverflow.com/a/63407811

Mahesh Kavathiya

06/28/2022, 5:32 AM

Hi Everyone, is it possible to change build flavour run time? I wanted to use common build for all environment and select flavour from menu, based on selection data will be updated which is available on each flavours like strings, drawable etc. Currently we are maintaining separate builds for DEV/SIT/UAT, but want to keep single build and QA can select flavours based on their requirement for testing. Any thought process on this? Thanks

🇳🇴 2

Ali

06/29/2022, 11:43 AM

What is the efficient way to modify a list in kotlin? for ex. From this list

mutableListOf(listOf(1,2,3,4,5), listOf(6,7,8,9,10))

I need this modified result but keeping original list as it is.

[[1,2], [6,7,8,9,10]]

Aldup

06/29/2022, 11:37 PM

Hello guys I want to push a local notification at a scheduled time eg: everyday at 09:00pm, defined by the user. Either with WorkManager or AlarmManager. Any advice ? Ps: I'm using jetpack compose.

:not-kotlin: 2

Michael Bichlmeier

06/30/2022, 8:28 AM

Hey guys, is someone of you using the play console managed publishing? I have a question about that and hope you can help me

:kotlin: 1

:android-dance: 1

:not-kotlin: 6

Rohan Maity

06/30/2022, 9:53 AM

Does Navigation Kotlin DSL (not compose) support actions?

Mjahangiry75

06/30/2022, 11:02 AM

Is it a bad practice to have a same model for both

retrofit

and

room?

:not-kotlin: 5

Katarzyna

06/30/2022, 11:26 AM

Recently, Mustafa wrote a rule-based validation structure for all my inputs. It’s very flexible and manageable. Today he will try to explain the validator library. Read the article written by Mustafa Yigit. 👇 validator | Rule Based Validation Library in Android | by Mustafa Yiğit | Jun, 2022 | Kt. Academy (kotlin-academy.com )

AmrJyniat

06/30/2022, 1:18 PM

How to recollect

SharedFlow

when the first collect got exception? like I expose a

Flow

from repo to VM then convert it to

SharedFlow

shareIn()

then collect this SharedFlow from the fragment, now I got an exception while collecting the SharedFlow, so how to retry/recollect it again?

Title

AmrJyniat

06/30/2022, 1:18 PM

How to recollect

SharedFlow

when the first collect got exception? like I expose a

Flow

from repo to VM then convert it to

SharedFlow

shareIn()

then collect this SharedFlow from the fragment, now I got an exception while collecting the SharedFlow, so how to retry/recollect it again?

gildor

07/05/2022, 4:14 AM

You should include this recollection logic before converting it to SharedFlow You can use

retry

for this: https://kotlinlang.org/api/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines.flow/retry.html

But still, I would recommend to handle it on level of original Flow, because it knows better semantics of those errors and have more ways to handle it, so your flow wouldn’t propagate errors, instead ignore errors and retry or emit error state and retry after that So if you control code of original Flow, just handle it there, if not, you can use

retry

But don’t forget, you should use retry before creating StateFlow

AmrJyniat

07/05/2022, 7:07 AM

I could use retry on the original Flow like:

flow.retryWhen { cause, attempt -> 
    attempt < 3
}

But I have a button for retrying the API call when failed and, I couldn't handle the retry mechanism when the click event occurred.

gildor

07/05/2022, 7:10 AM

BTW, flow.retry(3) will do the same

But user retry is different thing, and probably should be resolved on level of reactive stream, so when you have source (or multiple sources) of event to start loading, it mapped to your request

It hard to recommend particular solution without context

But this doesn’t look as work for retry() at all, but rather matter how you design your data flows

AmrJyniat

07/05/2022, 7:20 AM

I receive the Flow from repo to VM like:

val flow: Flow<Result<T>> = repo.getData()

And collect the flow in the fragment, now the retry button appears when the

result

failed, I searched for an elegant/clean way to recollect the flow on the click event, therefore, the API called again but I didn't found. I ended up with something like that:

private val _sponsors = Channel<Unit>()
val sponsors = _sponsors.receiveAsFlow().flatMapLatest {
        repository.loadSponsors()
  }.myShareIn(viewModelScope, replay = 1)

fun loadSponsors() = viewModelScope.launch {
   _sponsors.send(Unit)
}

init { loadSponsors() }

In this case, just call `loadSponsors()`fun when the retry button clicked, what do you think?

gildor

07/05/2022, 9:33 AM

so what is your problem with this code?

I’m not exactly sure that I see any problem So you should show error case and allow to reload

Just do not cache failed “repository.loadSponsors”

return some error state instead

like:

val sponsors = _sponsors.receiveAsFlow().flatMapLatest {
        return runCatching {
            repository.loadSponsors())
         } 
  }.myShareIn(viewModelScope, replay = 1)

I use Kotlin Result here, but you can use any own state to propagate error

AmrJyniat

07/05/2022, 9:40 AM

I see, thank you man, I just tried to apply the cleanest way.

gildor

07/05/2022, 9:47 AM

Otherwise how you can handle error case?

AmrJyniat

07/05/2022, 10:10 AM

The

sponsors

val is a flow containing custom Result class

Result<T>

, so when collecting it in the fragment I'm just checking if the result failed or not, therefore, I don't need any processing in the VM like

runCathing{}

because the catch applied already in the repo layer.

gildor

07/05/2022, 12:51 PM

So if you already have this Result class, you do not throw exception and no need to restart, right?

AmrJyniat

07/05/2022, 12:58 PM

Ok but if the result failed when collecting the flow, how to recall the API? I need to recollect the flow again, that's it.

gildor

07/05/2022, 1:51 PM

What kind result?

If loadSponsors will return error?

But in this case you just restart chain by emitting to _sponsors

AmrJyniat

07/05/2022, 2:03 PM

Yes in the final solution I retrigger the API call by emitting to _sponsors. But I was hoping to find something built-in like retry() in the Flow Apis to make my code more elegant.

gildor

07/05/2022, 3:09 PM

retry exists, it just will not help in this case

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