One Android Engineers said "We do not recommend switching to build.gradle.kts yet"

What’s the best way to accomplish manual dependency injection into viewmodels? The following leads to

Unchecked cast: MyViewModel to T

, which leads me to believe there may be a better way

class MyViewModel(private val myDependency: MyDependency) : ViewModel() {}

class MyViewModelFactory(private val myDependency: MyDependency) : ViewModelProvider.NewInstanceFactory() {
    override fun <T: ViewModel?> create(modelClass: Class<T>): T {
        return MyViewModel(myDependency) as T
    }
}

// In activity
private val myViewModel: MyViewModel by lazy {
    val myDependency = MyDependency()
    ViewModelproviders.of(this, MyViewmodelFactory(myDependency))
        .get(MyViewModel::class.java)
}

yeesh. view models have ruined what should otherwise be a trivial operation.

I am trying to implement a very simple RecyclerView. I am using DiffUtil to calculate the diff between the original and modified list. The problem I am facing is the original and modified list are always the same. I understand it’s a issue related to list references but cannot figure out what can I change. I have tried creating a newList (new reference) every-time something is updated. What am I missing?

Hi everyone - is Anko a given for most android projects? I’m a beginner and don’t like being too abstracted from what’s going on. But if it’s part of the canon for android development then I think it would be fine to use.

Hey Guys, I have problem with kotlin android and retrofit 2, rxjava That is "Caused by: kotlin.UninitializedPropertyAccessException: lateinit property compositeDisposable has not been initialized"

how do you define “safe”?

When the runner beats the ball to the plate ⚾

does anyone have a good article explaining how to use retrofit with coroutines and MVVM architecture

Is there a good Kotlin wrapper for the Google Play Services Location API mess?

I'm working with an api that returns either

{ "data": { ... } }

or

{ "error": { ... }}

for all of its calls. Are there any examples out there for modeling this using a sealed class w/ Retrofit

OK, that makes sense. Am I probably going to be looking at writing some sort of custom response converter for this, or can one of kotlinx.serialization/Moshi/Gson handle this somewhat automatically?

guys, any tips for me? im still a junior dev, and its already 1 year i spent on android dev. but idk why, i keep write my android apps with procedural mindset.

Should I use view model to start other activities and/or show toast messages by sending context to view model through methods: from activity -> myVm.someMethod(applicationContext), from view model -> someMethod(applicationContext) { startActivity(Intent(applicationContext...))}

Excuse me for so many questions, but I just started developing with kotlin. I am using okhttp3 interceptor to add new headers to requests. Since I have two types of request I have two instances of retrofit builder with different interceptors. On POST request my header content-type: application/json is doing just fine, but when I add my header x-access-token to DELETE request it refuses to add that header on request and I don't know why. I am using retrofit, coroutines, logging interceptor, header interceptor and JakeWharton/retrofit2-kotlin-coroutines-adapter.

Have any of you ever changed the language in runtime while running espresso tests? We are trying to automate the screenshot generation for our app in all the available languages, yet local changes are not reflected in the UI. Ideas?

stable version of

work manager

released ? Earlier it was beta, are they released stable version ?

Hey all - I’m using coroutines version 1.1.1, and on Android 5.0, I get this message:

Rejecting re-init on previously-failed class java.lang.Class<kotlinx.coroutines.CoroutineExceptionHandlerImplKt>

The app doesn’t crash, but I’ve got a

deferred.await()

that never seems to resume. There’s no other exception information following this message in the logs. Also, I’ve only seen this happen on Android 5.0 - even Android 5.1 seems to work fine. Has anyone else run into this?

I'm a newbie Android, I want to join the project ti improve my skill. Anybody help me ?:(

Are there examples of how to strip away a top level Kotlin extension function (with default parameter) with proguard? Right now I have the following:

-assumenosideeffects class com.example.package.ExtensionsKt {
    public static void myFunction(...);
}

The function is defined as follows:

fun Any.myFunction(param1: String, param2: Throwable? = null) {
    ...
}

But it does not work sadly, I also tried the following (method signature copied from mapping.txt) which also does not work:

-assumenosideeffects class com.example.package.ExtensionsKt {
     public static void myFunction(java.lang.Object,java.lang.String,java.lang.Throwable);
     public static void myFunction$default(java.lang.Object,java.lang.String,java.lang.Throwable,int,java.lang.Object);
}

It looks like

androidx.core.view.doOnPreDraw

does not get called if the view is created while the device is locked, is it a known issue? Is there a workaround?

Hello guys! Please help me with Coroutines. I need to implement this: 1. Run my task in background mode 2. Stop the task in 30 seconds 3. Delay 10 seconds. 4. Repeat my cycle (1-3 points) infinitely https://prntscr.com/mu5xin (detailed on a picture)

hi guy, what do you use for autocorrect indentation? and code style?

What is the reason for

@Parcelize

still being experimental? When will it become stable? Are there still some bugs that needs to be fixed?

I have data class which contains non nullable parameters like

first_name

,

last_name

etc also using

Gson

for parsing. Suppose server doesn't send any one of the key value. I am expecting app should crash but it is not crashing. When i degug value is

null

.Any one knows what is the reason ?

Saw that there was no Kotlin equivalent for the "Introduction to Sceneform" Codelab so I decided to re-write it! Here is my attempt: https://github.com/sorianog/ARStickers

but its when i press back button

Can someone confirm putting this anywhere in your project destroy sth in androids dex format and your app crashes on start?

Hey guys, I have a Kotlin class with some reified and equivalent normal functions:

// Java fun
fun <T:E> registerEvent(cls:Class<T>, consumer: Consumer<T>) : Disposable {
        return this.listen(cls)
            .subscribe(consumer)
    }

// Kotlin fun (calls the java one)
inline fun <reified T:E> registerEvent(consumer: Consumer<T>): Disposable {
        return registerEvent(T::class.java, consumer)
    }

In java I have no problem calling

registerEvernt(SomeClass.class, this::consumerMethod)

, but in Kotlin, when I try to do a method reference for the consumer, the compiler gives me an error and says it returns a

KFunction1<SomeClass, Unit>

and the required parameter is

Consumer<SomeClass>

. Is there any way I can make the functions behave the same, or is the

inline

or something else making it impossible?