Anyone faced this issue with epoxy. SetData on epoxy controller isn't appending to the old list but overwriting it.

class KnowledgeArticleListController : Typed2EpoxyController<List<Article>, KnowledgeArticleListActionHandler>() {
  override fun setDebugLoggingEnabled(enabled: Boolean) {
    super.setDebugLoggingEnabled(true)
  }
  override fun buildModels(data: List<Article>, listener: KnowledgeArticleListActionHandler) {
    data.forEachIndexed { index, article ->
      knowledgeArticleListItemView {
        id(article.id)
        article(article)
        listener(listener)
        lastItem(index == data.lastIndex)
      }
    }
  }
}

@EpoxyModelClass(layout = R.layout.knowledge_article_list_item)
abstract class KnowledgeArticleListItemView : EpoxyModelWithHolder<ViewViewHolder>() {

  @EpoxyAttribute
  var category: Category? = null

  @EpoxyAttribute
  var article: Article? = null

  @EpoxyAttribute(EpoxyAttribute.Option.DoNotHash)
  lateinit var listener: KnowledgeArticleListActionHandler

  @EpoxyAttribute(EpoxyAttribute.Option.DoNotHash)
  var lastItem: Boolean = false

  override fun bind(holder: ViewViewHolder) {
    if (category != null) {
    
    } else if (article != null) {
      
    }

    holder.knowledgeArticleListItemCell.showTopBorder = false

    // don't show bottom border if last item, toolbar border is there
    holder.knowledgeArticleListItemCell.showBottomBorder = !lastItem
  }

  override fun unbind(holder: ViewViewHolder) {
    holder.knowledgeArticleListItemCell.setOnClickListener(null)
  }
}

class ViewViewHolder : KotlinEpoxyHolder() {
  val knowledgeArticleListItemCell by bind<StandardCell>(R.id.knowledgeArticleListItemCell)
}

I’m trying to set insets to my cardView(“titleBar”) but it isnt reflected in the app. But when i debug it i can see statusBarHeight is changed and should be updated in layoutParams

I don’t know if this is Android specific or generally applicable. I just lost a day (at least) worth of work due to this little surprise:

val family = 42

val friends = 0

println("Family:Friend ratio = ${family / friends}")

What my investigations some to indicate is that for many error exceptions (though not all), an exception inside of a ${} will cause the remainder of the calling context to be terminated and it just silently move on. Is this a known phenomenona? A temporary bug that is meant to be fixed? I’m using an up-to-date version of AndroidStudio.

Hi. We create a Coroutine Scope, and call a function inside launch. What's the difference between making that function "suspend" and "not suspend(regular)" ?!

I'm designing the app model (not necessarily the

@Entity

-ies) with the help of the room docs. The thing is that in

one-to-many

scenario the parent knows nothing about the children plus every child has only an ID of the parent. However I absolutely have to have an

Ad

as well as the list of application results (not just ids, whole objects) in

AdEntry

. Is it possible to do so in Room?

I’m in the process of trying to fully convert my project to androidx. Having a weird crash before my Activity even gets started: Caused by: java.lang.ClassNotFoundException: Didn’t find class “androidx.appcompat.R$drawable”

I did upgrade to Kotlin 1.3.70

Need advice on what to focus. I have developed some iOS apps and just recently learning Android dev. I have learn the basic (and glance through example apps) of Kotlin, Coroutines, Flow, Multiplatform, Ktor, Jetpack LiveData, Navigation, ViewModel, Fragment etc, and understand what stacks are required for modern Android app. The next step for my learning is develop an actual app and plan to master Android development by end of the year. I have more or less settle on Multiplatform with sqldelight, koin and kTor http client for the common codes. On the Android side, the choices are option A: current Jetpack components (Navigation, LiveData, ViewModel) or option B: Compose. Option A has many different pieces to learn and will take more time to master. The easy solution to to pick up both but it might be a waste as it appears that many Jetpack components such as Navigation, LiveData might not be even needed in Compose. On the other hand there are many tutorials, sample apps and architecture recommendation for the current Jetpack components, while its practically non existent for Compose (for example what’s the best stacks to use for an MVVM, MVI architecture Android app with Compose? Can one use Flow instead of LiveData?). Any advice, insights is much appreciated as I probably have some misunderstanding of modern Android stacks. Is knowledge of LiveData, Navigation, ViewModel etc essential for future (next year onwards) Android app development (assuming I do not need to support old Android codes)? If you’re planing a new Andoid app from scratch to start developing beginning 2021, what components/stacks would you use?

What do people use to request runtime permissions through a suspending function? Simple google search shows this and this . Anyone has any opinions or alternatives worth considering?

App crashes when doing

class MainActivity : AppCompatActivity() {
    companion object {
        init {
            System.loadLibrary("encrypt")
        }
    }
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        tv_cipher.text = encryptString("test")
    }

    external fun encryptString(plaintext: String): String
}

Anything wrong? Library is already inside their respective architectures under

src/main/jniLibs/<archi>

Any one doing ui testing? I am trying to run emulator on jenkins(aws ec2) , it giving me error also can we run x86 emulator on jenkins?

Hello. I am having some trouble figuring out what is going on in this Android sample Specifically

sealed class Result<out R>

From the generics documentation

The general rule is: when a type parameter 

T

 of a class 

C

 is declared out, it may occur only in out-position in the members of 

C

, but in return 

C<Base>

 can safely be a supertype of 

C<Derived>

.

In “clever words” they say that the class 

C

 is covariant in the parameter 

T

, or that 

T

 is a covariant type parameter. You can think of C as being a producer of `T`'s, and NOT a consumer of `T`’s.

So I can see that type parameter

R

of class

Result

can only be returned by

Result

,

Error

and

toString

but what is

R

? Is my assumption correct? I can see here that it is a callable reference

References to functions, properties, and constructors, apart from introspecting the program structure, can also be called or used as instances of function types.

The common supertype for all callable references is 

KCallable<out R>

, where 

R

 is the return value type, which is the property type for properties, and the constructed type for constructors.

But I am not sure what that is or why it matters here. Is this applicable to this sealed class or is this not considered a callable reference since it is a sealed class? Is the constructor the callable reference and then the return type is

Change<R>

?

Hi all - anyone have some prod experince with MVI and Unidirectional data flow with Kotlin Flow/Coroutines?

What is the point of generating a separate keystore for a debug build? I found this in a open source project. Doesn’t android studio generates a

debug.keystore

by default for a debug build?

signingConfigs {
        debug {
            storeFile file('keystore/debug.jks')
            storePassword 'android'
            keyAlias = 'android'
            keyPassword 'android'
        }
    }

Hi Mates, i need a help in writing unit test cases for a top level function, if possible can you guys help me to get through this, Stackoverflow question , thanks in advance

Hi folks, anyone that uses moshi and moshi codegen was able to update to Kotlin 1.3.70 ? I'm getting a compilation fail on

compileDebugJavaWithJavac

with

no source files

message, When a downgrade to Kotlin 1.3.50 its working.

Hi guys! Anyone implemented an architecture in their own library? I wonder where can i find examples of library with MVVM or MVP architecture? Thanks!

Is there a way to shorthen the part in red? (I know that in Swift there is something) Following line I am calling an enum which is inside a companion object in my ViewModel. This lne is called from my Activity:

Hi people, maybe someone can help me explain coroutines for my use case: I am developing a BLE communication protocol which includes messages that receive a custom answer from the peripheral. Now I would like to use coroutines and channels to make a queue of messages to send and only send the next message after a successful response. I am struggling to understand how I can await the result of the ble callback since it is not a function that returns anything. Thanks in advance!

Hi All, I am new to Kotlin and started android development with Kotlin. Can you guys tell me what is the advantage of using Kotlin over Java?

Hello, sometime recently i believe i came across a library which had a logging feature where instead of using

Log.d(TAG, "something")

, you could just do

d { "something" }

and the logger would automatically figure out what class and method its in. Does anyone either happen to know this library or know how i could implement that myself?

Does anyone else have near constant problems with Viewbinding/navigation components and Android Studio not recognizing the generated Kotlin code?

Can we use DialogFragment or BottomSheetDialogFragment with constructor injection using FragmentFactory.

Hi, can someone explain why IntelliJ is giving an error like that? IntelliJ is saying that

Variable mOnClickListener must be initialized

and underlines the

mOnClickListener

inside the

init

statement. I have been doing the same thing in Java and it didn’t say anything like that. Am I missing something here ? EDIT : I am trying to make a custom layout here. I have been doing this in Java all the time - assigned

OnClickListener

to a private variable and then setting it to a button in the constructor.

class CustomLayout(context: Context) : FrameLayout(context) {

    companion object {
        const val RESOURCE = R.layout.layout_custom
    }

    init {
        LayoutInflater.from(context).inflate(RESOURCE, this)
        // IntelliJ underlined `mOnClickListener` here and it says : "Variable mOnClickListener must be initialized"
        btnSend.setOnClickListener(mOnClickListener) 
    }

    private val mOnClickListener = OnClickListener { context.toastInfo("Info") }
}

Java version of the code which works fine

public class CustomLayout extends FrameLayout{

     public CustomLayout(){
          // inflating the xml layout
          ...
          btnSend.setOnClickListener(mOnClickListener);
     } 

     private OnClickListener mOnClickListener = new OnClickListener() {
        @Override
        public void onClick(View v) {
            // do something
        }
    };  

}

Oh, oops I read your earlier message and thought you meant “low memory issues” 😄

In Kotlin you can have a file that contains multiple class or interface definitions. when this is the case what name do you give to your file? For example if you had Dagger in your project and you wanted to group the

@Component

and

@Module

defined in the same file what would you name that file?

I want to have something occur at a 5 second tick. What is the kotlin/Android idiomatic way to do this? I’m currently doing:

this.timer = Timer()
this.timer?.scheduleAtFixedRate(timerTask { simulate() }, 0L, 5000L)

I’m not a fan of this solution, because

this

isn’t what I expect this to be in that case. But when in rome, I guess? Or is there a different more modern idiomatic way to cause a real closure to tick at a rate?

Anyone familiar with the new scoped storage rules? https://developer.android.com/training/data-storage/shared/media#remove-item I’m attempting to delete a file like so:

context.contentResolver.delete(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, "${MediaStore.Audio.Media._ID} = ?", arrayOf(id.toString()))

Supposedly, if I don’t have permission, this should throw a

RecoverableSecurityException

on Android Q, and I should be able to use an IntentSender to have the user grant permission. Instead, I just get a result of

0

from the

delete()

call, meaning no files were deleted. Any ideas?

I want to dynamically include or exclude a field in a kotlin class based on certain conditions at run time before making a POST request using Retrofit and Gson, anyone has ideas on how to achieve this dynamically? I've tried using the expose annotation but it can't accept run time variables.

when using MAterialToolbar, how to set it's style in themes?

<item name="toolbarStyle">@style/Widget.Toolbar</item>

and then

<style name="Widget.Toolbar" parent="Widget.MaterialComponents.Toolbar">>

does nothing. does any1 have a clue ?