kotlinx.coroutines | Library support for Kotlin coroutines | Android library
kandi X-RAY | kotlinx.coroutines Summary
kandi X-RAY | kotlinx.coroutines Summary
Library support for Kotlin coroutines with multiplatform support. This is a companion version for the Kotlin 1.6.0 release.
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Lines of Code : 53License : Strong Copyleft (CC BY-SA 4.0)
Copyinclude(":application")
include(":libraryA")
include(":libraryB")
plugins {
application
kotlin("jvm") version "1.3.61"
}
dependencies {
api(project(":libraryA")) // we reference only library, we know nCommunity Discussions
Trending Discussions on kotlinx.coroutines
QUESTION
we received a crash on Firebase for a kotlin method:
...ANSWER
Answered 2022-Apr-12 at 11:53Shouldn't the exception be thrown way before getting to the constructor call for DeliveryMethod?
Within Kotlin, it's not possible for a non-null parameter to be given a null value at runtime accidentally (because the code wouldn't have compiled in the first place). However, this can happen if the value is passed from Java. This is why the Kotlin compiler tries to protect you from Java's null unsafety by generating null-checks at the beginning of some methods (with the intrinsic checkNotNullParameter you're seeing fail here).
However, there is no point in doing that in private or suspend methods since they can only be called from Kotlin (usually), and it would add some overhead that might not be acceptable in performance-sensitive code. That is why these checks are only generated for non-suspend public/protected/internal methods (because their goal is to prevent misuse from Java).
This is why, if you manage to call addSingleDMInAd with a null argument, it doesn't fail with this error. That said, it would be interesting to see how you're getting the null here, because usually the checks at the public API surface are enough. Is some reflection or unsafe cast involved here?
EDIT: with the addition of the calling code, this clears up the problem. You're calling a method that takes a List from Java, with a list that contains nulls. Unfortunately Kotlin only checks the parameters themselves (in this case, it checks that the list itself is not null), it doesn't iterate your list to check for nulls inside. This is why it didn't fail at the public API surface in this case.
Also, the way your model is setup is quite strange. It seems the lateinit is lying because depending on which constructor is used, the properties may actually not be set at all. It would be safer to mark them as nullable to account for when users of that class don't set the value of these properties. Doing this, you won't even need all secondary constructors, and you can just use default values:
QUESTION
When I double click the same item or if I go to each composable screen very quickly i receive an error, How do I solve this problem? I tried changing few things but I just can't solve it and I can't find any resources to fix this problem.
Bottom Navigation implementation
...ANSWER
Answered 2022-Mar-06 at 09:39I'm facing the same problem using the latest compose navigation dependency 2.5.0-alpha03.
I don't know why it's happening.
Philip Dukhov is right, you should report this issue.
Here is a dirty workaround :
QUESTION
I am attempting to unit test a method that is part of my use case layer of an Android app. The method receives an XML RSS feed and returns it to the view model as GSON-parsed objects. The testing class is annotated with @RunWith(RobolectricTestRunner::class).
The test fails because a java.lang.ExceptionInInitializerError (among others) is thrown by .fromHtml() within this method of the use case class:
ANSWER
Answered 2022-Mar-21 at 13:56I have discovered a solution. Add the following to the android section of the module build.gradle:
QUESTION
I've updated my android application to target Android S and was made to add
...ANSWER
Answered 2021-Oct-20 at 13:35The fix was to also increase paging androidx.paging:paging-runtime-ktx to beta01
QUESTION
I'm working on an Android app with a Gradle version of 7.1.1 and an Android Gradle Plugin version of 7.0.0. When I upgrade to Gradle version 7.2 and Android Gradle Plugin version 7.1.1, I get the following error.
ANSWER
Answered 2022-Mar-08 at 14:39Desugaring effects "a subset of java.time" so upgrading to the latest version of desugar_jdk_libs should fix the issue. At the time of posting, the latest version is 1.1.5.
References
QUESTION
I'm able to call a function using async when its returning just one value.
However, if the return is a Pair, I get - Destructuring declaration initializer of type Deferred must have a 'component1()' function
Am I missing something?
Here is a sample code:
...ANSWER
Answered 2022-Feb-21 at 09:12The problem is that you can only destructure the Pair this way, but not the Deferred itself.
You could first assign the deferred value to a single variable, and later await it so you get a Pair that you can destructure:
QUESTION
2022-02-15 09:53:53.459 7750-7750/? E/ple.anotadomin: Unknown bits set in runtime_flags: 0x8000 2022-02-15 09:53:57.317 7750-7789/com.example.anotadomina E/AndroidRuntime: FATAL EXCEPTION: DefaultDispatcher-worker-1 Process: com.example.anotadomina, PID: 7750
Hello there, I'm getting this error while trying to call a fun inside a couritunescope or even global scope, i don't know why, i'm currently on the third day trying to solve the error with google with no luck.
...ANSWER
Answered 2022-Feb-15 at 16:27You're indirectly trying to call addObserver on a background thread, while you were supposed to do it on the main thread.
This is due to accessing your viewModel directly from the background coroutine here (via a viewModels() delegate):
QUESTION
Given a REST endpoint and two asynchronous coroutines each returning an integer, I want this endpoint to return their sum. The two functions (funA and funB) should run in parallel, in such a way that the whole computation should take ~3secs. I'm using SpringBoot 2.6.3 and Kotlin Coroutines 1.6.0. Here is my attempt:
...ANSWER
Answered 2022-Feb-14 at 10:11You really messed this up ;-) There are several problems with your code:
- Use
runBlocking()only to use anotherrunBlocking()inside it. - Use
async()and immediately callawait()on it (insumming()) - it does nothing. funA().await()andfunB().await()don't make any sense really. These functions return integers, you can'tawait()on already acquired integers.- Generally, using much more code than needed.
The solution is pretty simple: use runBlocking() once to jump into coroutine world and then use async() to start both functions concurrently to each other:
QUESTION
I'm trying to get a simple map as my mainActivity to test how maps with compose works. Unfortunately I just fail at the beginning with an Errormessage which says basically nothing but "IllegalStateException". I've tried to extract the map code from the original Google example here: https://github.com/android/compose-samples/tree/main/Crane I've tried to rebuild a simple Composable, made an API Key at Google Cloud Platform and added it to my manifest.
Thats the MainActivity:
ANSWER
Answered 2021-Nov-14 at 18:43I don't know if you are reading this, but you have forgotten to include ON_START event for lifecycle, so you are throwing the exception. Also you are calling onStart on ON_CREATE.
Also consider populating the lifecycleObserver to be scoped into the DisposableEffect and make the DisposableEffect also aware of the mapView (give it as an argument).
QUESTION
I have read the article.
There are two approaches to making computation code cancellable. The first one is to periodically invoke a suspending function that checks for cancellation. There is a yield function that is a good choice for that purpose. The other one is to explicitly check the cancellation status.
I know Flow is suspending functions.
I run Code B , and get Result B as I expected.
I think I can't making computation Code A cancellable, but in fact I can click "Stop" button to cancel Flow after I click "Start" button to emit Flow, why?
Code A
...ANSWER
Answered 2022-Feb-02 at 13:37It has to do with CoroutineScopes and children of coroutines. When a parent coroutine is canceled, all its children are canceled as well.
More here: https://kotlinlang.org/docs/coroutine-context-and-dispatchers.html#children-of-a-coroutine
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