I'm trying to run test on a simple app with kotlin but normal gradle commands are failing with error

Execution failed for task ':app:kaptDebugKotlin'.
> Could not find tools.jar in system classpath, which is required for kapt to work

hi guys！when you want to create a Singleton ，which one would you choose？ ‘object’ or ‘companion object’？ what is different？

hi! i'm following through an anko tutorial to teach myself android basics but video has older dependencies and sdk versions. i'm stuck at this error. i tried googling for the error but have not found any leads to how i might solve it. help? anyone? here's the error:

Failed to resolve: org.jetbrains.anko:anko-sdk28:0.10.8
Open File
Show in Project Structure dialog


Failed to resolve: org.jetbrains.anko:anko-sdk28-coroutines:0.10.8
Open File
Show in Project Structure dialog

and the gradle build code:

dependencies {
    ...
    // Anko
    implementation "org.jetbrains.anko:anko:$anko_version"
    // Anko Layouts
    api "org.jetbrains.anko:anko-sdk28:$anko_version"
    implementation "org.jetbrains.anko:anko-appcompat-v7:$anko_version"
    // Coroutine Listeners for Anko Layouts
    api "org.jetbrains.anko:anko-sdk28-coroutines:$anko_version"
    implementation "org.jetbrains.anko:anko-appcompat-v7-coroutines:$anko_version"
    // for Snackbars
    implementation "org.jetbrains.anko:anko-design:$anko_version"
    implementation 'com.android.support:design:28.0.0'
}

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Can anyone help me

Hello, Can you help me ? I am a beginner. Where can be a bug ? Search in the map not work.Thanks / Kotlin / https://hastebin.com/ezasewilas.cpp

I wish they fixed AS 3.2.1 freezes first, so I can finally move from 3.1.4 😒

Hi all, is there any way to reboot phone or turn off/on mobile data, or turn off/on airplane mode, without root and "system installed app"?

Is anyone else having issues building projects with Fabric after upgrading to AS 3.3?

Hello ! I'm trying to see if there is a better way to do what I want to do. I wanted to upsert in my Room database. Is there any better way to do it than :

@Transaction
    fun upsertAll(t: List<T>) {
        val id = insertAll(t)
        if (id.any { it == (-1).toLong() }) updateAll(t)
    }

?

Quick question, couldn't find an answer on Google: does Room support inline classes for fields? Like, if I wanted to store

inline class FooId(val id: String)
data class Foo(val id: FooId)

would that work out of the box? But storing a

List<FooId>

wouldn't work without a TypeConverter, right?

Hi guys, I am getting this error, any idea? All libraries are on the latest version.

line 12

@Mehdi Maybe adding a loading state to that result would be a good idea

Moreover, you probably need a map/flatMap function for chanining multiple responses

Moreover, like Anton said, you don't need that result variable and it would be a better idea to send it using an observable to the activity

Probably in the view model/presenter you have in between the service and the activity

btw, was it introduced for a specific case? Maybe coroutines related. Or just for generic purposes?

Does anyone know if I need to do a database migration with ROOM when changing a data class variable from val -> var?

Hi, did someone familiar with kotlin-multiplatform?

isn't it shipped with it's own patched JDK?

@louiscad I suspect you've dealt with LiveData and Coroutines, did you find a way to do something similar to

Transformations.map { }

using suspend functions in the mapping?

The use of this block is to provide a ViewModel in an Activity and it's used like so:

private val model: MyViewModel by viewModelProvider { MyViewModel(dependencies) }

is there anyway to invoke suspending functions from livedata observers? i’d like to be able to do something like this:

val liveData: LiveData<List<Thing>> = myDao.getAllThings()
val mediator = MediatorLiveData<Things>

fun startObservation() {
    mediator.addSource(liveData) { it?.let { newThings->
        sendThingsOverNetwork(newThings)
    }
}

suspend fun sendThingsOverNetwork = withContext(<http://Dispatchers.IO|Dispatchers.IO>) {
     // Do network ops off main thread
}

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Hey, good afternoon! i'm programming at kotlin at sever-side but i want to init at android. Any course/video to start?

What is everyone's database layer of choice for Android? (such as Room)

what is the use of !! in kotlin