Questions related to Kotlin Android Extensions
Questions tagged [kotlin-android-extensions]
721 questions
5
votes
1 answer
Returning a Kotlin result in a coroutine context throws an exception
I have a simple setting:
lifecycleScope.launch {
val result = test()
}
suspend fun test(): Result = withContext(Dispatchers.IO) {
Result.failure(IllegalStateException("QWER"))
}
Actual result:
The code above is crashing…
Evgeni Roitburg
- 1,958
- 21
- 33
5
votes
1 answer
How can I share a Surface between MediaCodec encoder and CameraX
I want to get the images from CameraX (Preview Use case) and encode them as h.264 Video using MediaCodec. How can I achieve this ?
What I was trying was, to use the Surface returned from MediaCodec.createInputSurface() in Preview.Builder() by using…
aispark
- 159
- 8
5
votes
2 answers
How does thread synchronization work in Kotlin?
I have been experimenting with Kotlin synchronization and I do not understand from the docs on how the locking mechanism works on thread synchronization over common resources and thus attempted to write this piece of code which further complicates…
BRG
- 61
- 1
- 6
5
votes
2 answers
Private members variables in Data Class in Kotlin
I am new to kotlin and when I was reading about the data classes in kotlin and I found these code.Its basically a comparision between the java model class and kotlin data class and it was wriiten over there that both the code do the same task.
Code…
Abhishek Agarwal
- 99
- 2
- 8
5
votes
1 answer
what is the difference between lazy and lazyFast in kotlin?
what is the difference between Kotlin's lazy delegate property lazy and lazyFast?.because it looks like same code.
private val key: String by lazy {
if (arguments != null && arguments?.getString(Constants.KEY) != null) {
…
Ronak Ukani
- 603
- 5
- 20
5
votes
1 answer
Is it possible in one Java file to mix Java code and Kotlin code
Android Studio 3.4.2
in build.gradle:
buildscript {
ext.kotlin_version = '1.3.41'
repositories {
google()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.4.2'
classpath…
Alex
- 1,857
- 4
- 17
- 34
5
votes
2 answers
Where to find the liveData building block?
https://developer.android.com/topic/libraries/architecture/coroutines
Android coroutines plus liveData documentation states that we can use the liveData builder function in case we want to want to perform async operations inside the live data…
Ninja420
- 3,542
- 3
- 22
- 34
5
votes
1 answer
Is there a way in Kotlin to combine an inline function and a when expression with an extension function?
I would like to reduce the size of an if-elseif-else ladder but can't use just when because the smartcast doesn't catch the cases I'm dealing with. I'm wondering if I can combine something like a let or an also and a when into a single inline…
Ryan Shea
- 73
- 4
5
votes
3 answers
How to make Alert dialog items?
I want to create alert dialog items. Here is my code.
val colors = arrayOf("Red","Green","Blue")
val builder = AlertDialog.Builder(this)
builder.setTitle("Pick a color")
builder.setItems(colors) {_,_ ->
…
user10413212
5
votes
2 answers
'return' is not allowed here: Kotlin Coroutine launch(UI) block
fun onYesClicked(view: View) {
launch(UI) {
val res = post(context!!,"deleteRepo")
if(res!=null){
fetchCatalog(context!!)
catalogActivityCatalog?.refresh()
}
}
}
Above code is working fine.…
SadeepDarshana
- 1,057
- 18
- 34
5
votes
2 answers
Parcelize complains "Parcelable should be a class" on objects and enums
When I try to annotate an enum class or object with @Parcelize, it results in the error 'Parcelable' should be a class, both as an editor hint and as a compile failure. I can @Parcelize classes just fine, but I can't do things like
@Parcelize object…
Leo Aso
- 11,898
- 3
- 25
- 46
5
votes
1 answer
onSaveInstanceState called after onDestroyView
I'm dealing here with strange fragment lifecycle behavior.
I have an activity that host two fragments: CityFragment - to display cities list and WeatherFragment - to display the weather forecast for selected city.
When the app starts CityFragment is…
Oliver1123
- 111
- 1
- 6
5
votes
1 answer
Not satisfied: inferred type T? is not subtype of Any
To map the result I have implemented sealed generic class :
public sealed class ResultMapper {
public class Ok(public val value: T,
override val response: Response) : Result(),…
QuokMoon
- 4,387
- 4
- 26
- 50
5
votes
1 answer
Java and Kotlin combined build error (Duplicate Zip Entry)
I have added Kotlin library to my existing project. After that I'm getting the build error. I commented all the recently added libraries and checked the main problem is after adding kotlin library
Error:Execution failed for task…
Praveen
- 465
- 5
- 13
5
votes
1 answer
lateinit property adapter has not been initialized in Kotlin4Android
I have created RecyclerView in fragment inside activity, all are working good but when i do notifyDataSetChanged() to adapter from activity through interface,I got an error "lateinit property adapter has not been initialized" but I have already…
Umesh AHIR
- 738
- 6
- 20