Hi everyone! Yesterday AGP 4.2.0 was released and JDK 11 it’s now bundled with it. I just updated to AGP 4.2.0 and I’m now trying to get the project to work with JDK 11. It’s compiling perfectly, but I’m having issues on unit tests when comparing two formatted strings to currency (

NumberFormat.getCurrencyInstance

). Learning about some changes from JDK 8 to JDK 11, I found that on JDK 9 they’ve enhanced some things related to Locale. One of the things is the usage of CLDR. The issue with

CLDR

is that is uses

NBSP

instead of normal whitespace. The problem with

NBSP

is that is not straightforward for the developers to add it during unit tests. I tried to solve it by adding

-Djava.locale.providers=COMPAT

on

gradle.properties

(

org.gradle.jvmargs

), but it keeps using

NBSP

😢 Does anyone has suffered with it or have any idea how to address this issue?

Hello, what do you think about the AndroidX DataStore API? What do you like, and what do you dislike? If you don't use it, is there any reason for that besides lack of time to focus on it? Curious about other's points of view on that.

Hi everyone, I’m curious what the correct approach is when implementing

LifecycleObserver

. The Kotlin examples here use `@OnLifecycleEvent`: https://developer.android.com/topic/libraries/architecture/lifecycle#lc However, this page (Java examples) says that annotations will be deprecated: https://developer.android.com/reference/kotlin/androidx/lifecycle/Lifecycle , and instead I should implement

DefaultLifecycleObserver

What is the correct practice here? Thank you!

Use either DefaultLifecycleObserver if you want individual methods or LifecycleEventObserver if you want one method with event enums as the messages

A teammate just told me he was having a problem with

collect { }

. His issue was that the AS was expecting him to add the

@InternalCoroutinesApi

annotation, and it also required he add in the

FlowCollector

object implementation directly. At first I didn't know what happened, until he showed me the source code of the

collect

function he was calling. Turned out it was the

collect

function from the

Flow.kt

file. I asked if he had the option to do the auto-import for the extension function

collect

, but he didn't. I tried just typing out the

collect

function out without auto-complete, and saw this happening on my machine as well. This confused my teammate who is learning Coroutines and Flows, but I'm curious if anyone else has run into this either personally or with teammates.

Hello guys I’m new to this and trying to learn as much as I can but I’ve hit an obstacle and can’t seem to get around it. Problem is that I wanted to import something but it is just giving a reference error that is unknown and it is hard to find any answer on the internet. So any insight on what am I doing wrong with it would be much appreciated.

When collecting a flow using an activity lifecycleScope, I’ve noticed that using the default

CoroutineStart.Default

, doesn’t work sometimes when using an empty buffer

Channel

and

receiveAsFlow

(where an event is being offered instead of sent).

CoroutineStart.Undispatched

does seem to work however. I’m assuming this is because the launched coroutine needs to have executed the collect coroutine before an event is offered to the channel, in order to receive it. So, is using

CoroutineStart.Undispatched

the correct approach, or should I be using a buffered channel instead?

Hi Everyone, I am writing unit test cases in my android app which is following multi module clean architecture. I have created a shared test module to share common test logic to share across all the test classes in all the other modules. This shared test module is android lib module. I am have no problem sharing common test logic with app module which is also android module . But i am not able to resolve the references of the shared test module classes in data module(which is a java/kotlin module) during the runtime. For testing, i created another android lib module and tried to access shared test logic and it worked but i am not able to resolve the classes with non android lb modules. I have stackover question also where i have explained the problem in a detailed way please refer https://stackoverflow.com/questions/67383020/shared-test-classes-in-multimdule-android-project

is there a way to calculate the size of JSON in bytes using Kotlin?

HI ! And we are here with a beautiful gradle warning:

Runtime JAR files in the classpath should have the same version. These
files were found in the classpath:

and

w: Consider providing an explicit dependency on kotlin-reflect 1.5 to
prevent strange errorsw: Some runtime JAR files in the classpath have
an incompatible version. Consider removing them from the classpath

By inspecting the dependendencies: one library use 1.3 , one 1.4 and so on , and for last but not least I have just update my project to 1.5 version .. Sure I can bring back the version to 1.4, but there are other library set to 1.3. In which way kotlin-reflect could resolves the issue ? I provided an esplicit dependency on kotlin-reflect, but the warning still there.. Also some google's libraries However is not already updated to 1.5.0, for instance:

--- com.android.tools.analytics-library:tracker:27.2.0
 
 | | +--- com.android.tools:annotations:27.2.0
 
 | | +--- com.android.tools:common:27.2.0 (*)
 
 | | +--- com.android.tools.analytics-library:protos:27.2.0 (*)
 
 | | +--- com.android.tools.analytics-library:shared:27.2.0 (*)
 
 | | +--- com.google.protobuf:protobuf-java:3.10.0
 
| | +--- com.google.guava:guava:28.1-jre (*)
 
 | | \--- org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.4.31 (*)

What could happen if I would use different libraries with different kotlin version ? Do you update your project's kotlin language's version only when all the imported libraries are updated ? For instance this is the dependendencies of the old lifecycle-livedata-ktx:2.2.0, in an official libraries there are two different version of kotlin-stlib 1.3.5 and 1.4:

| | | | \--- androidx.lifecycle:lifecycle-livedata-ktx:2.2.0

| | | | +--- org.jetbrains.kotlin:kotlin-stdlib:1.3.50 -> 1.5.0 (*)

| | | | +--- org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.0 -> 1.4.1

| | | | | \--- org.jetbrains.kotlinx:kotlinx-coroutines-core-jvm:1.4.1

| | | | | +--- org.jetbrains.kotlin:kotlin-stdlib:1.4.0 -> 1.5.0 (*)

| | | | | \--- org.jetbrains.kotlin:kotlin-stdlib-common:1.4.0 -> 1.5.0

| | | | +--- androidx.lifecycle:lifecycle-livedata:2.2.0 (*)

| | | | \--- androidx.lifecycle:lifecycle-livedata-core-ktx:2.2.0

| | | | +--- org.jetbrains.kotlin:kotlin-stdlib:1.3.50 -> 1.5.0 (*)

| | | | \--- androidx.lifecycle:lifecycle-livedata-core:2.2.0 (*)

Please forgive all these questions

hey is this dependency still needed after upgrading to Kotlin 1.5

org.jetbrains.kotlin:kotlin-stdlib-jdk7

Hello guys. I would like to style my composables in Jetpack Compose using a similar mechanic to Swift UI’s styling like in this example.

struct DefaultButton: View {
   
   var body: some View {
     Button("Button"){}
       .buttonStyle(ButtonDefaultStyle())
   }
}

My style is in an external class.

struct ButtonDefaultStyle: ButtonStyle {
   func makeBody(configuration: Configuration) -> some View {
     configuration.label
       .frame(width: 100, height: 40)
       .foregroundColor(Color( colorLiteral(red: 1, green: 1, blue: 1, alpha: 1)))
       .background(configuration.isPressed ? Color( colorLiteral(red: 0.1254901961, green: 0.4666666667, blue: 0.4235294118, alpha: 1)) : Color( colorLiteral(red: 0.1411764706, green: 0.6784313725, blue: 0.5529411765, alpha: 1)))
       .clipShape(RoundedRectangle(cornerRadius: 50))
       .font(Font.custom("EuclidSquare-Medium", size: 16))
   }
}

The best would be to be able to override a style by another style or by an attribute (Button().{}.style1(...).style2(...).color(...)... Is there a way to do something similar in Compose ? If not, did I misunderstood Compose philosophy or is it just something currently lacking ?

Hello everyone, I was wondering if anyone hit the same problem with me after updating AGP version to 4.2.0 and Kotlin Gradle plugin to 1.5.0. It complains about “Unresolved reference: toUShort”. What is the right way to convert Integer value to UShort?

u

 and 

U

 tag unsigned literals does not seems to work for me as well. It said “Type of the constant expression cannot be resolved. Please make sure you have the required dependencies for unsigned types in the classpath”. Hope to get a hint, thanks in advance!

Hi! Trying to add Compose to an existing project as described here: https://developer.android.com/jetpack/compose/setup#add-compose Adding the Kotlin Android plugin as described on the documentation above:

plugins {
  id 'org.jetbrains.kotlin.android' version '1.4.30'
}

gives me the following error:

Hi, I have a library with a fragment and viewmodel and using that fragment in my app and created view model using ViewModelProviders.of(fragmentId).get(ViewModelName::class.name) I decided to remove ViewModelProviders but now when i use ViewModelProvider class, I am not able to pass on the fragment and also if i create view model using ViewModelProvider then there is no communication between ViewModel and Fragment exist in the library. Please let me know how this can be resolved using ViewModelProvider.

I'm adding testing to a large project that I'm working on, but it's been 5-6 years since I last worked with Android test frameworks. The project is 100% kotlin w/ coroutines. From my research it looks like I should be using Espresso for automation testing, and junit for unit testing (with Robolectric as sparingly as possible for unit tests that require interaction with Android). Anyone have any suggestions for patterns, libraries, or docs/blogs that would help get started with this?

Ever since AS 4.2 I get this Is this relevant or a bug?

I was using the android studio advanced profiling to measure something. I have noticed that the

system

storage is now

25GB

while yesterday it was

14GB

. Do you know if its possible to find any remaining trace files and remove them? This is a real device, pixel 4.

Does anybody here use KotlinxSerialization with Retrofit?

Please tell me where to find a list of all Jetpack Compose material elements (Text(), Column() Divider() etc). Is there such a document?

Hello guys, I'm getting this error when I'm trying to build a new project in Android Studio 4.2 A problem occurred configuring root project 'YouHaveClass'. Could not resolve all artifacts for configuration ':classpath'. > Could not find org.jetbrains.kotlin:kotlin-gradle-plugin:1.5.0-release-764. Searched in the following locations: - https://dl.google.com/dl/android/maven2/org/jetbrains/kotlin/kotlin-gradle-plugin/1.5.0-release-764/kotlin-gradle-plugin-1.5.0-release-764.pom - https://repo.maven.apache.org/maven2/org/jetbrains/kotlin/kotlin-gradle-plugin/1.5.0-release-764/kotlin-gradle-plugin-1.5.0-release-764.pom Required by: project : Possible solution: - Declare repository providing the artifact, see the documentation at https://docs.gradle.org/current/userguide/declaring_repositories.html How can I resolve this?

What the hell happened to AS 4.2? Change signature doesnt work. Random red underlines which actually compile fine. Clicking X to close causes glitches and exist way later. Feels slower as well ...

Does anybody here still Kotlin Synthetic extensions to access views or has everyone shifted to viewbinding? Like if someone had old projects, how did you go around migrating them?

Designer of my project uses new iPhone dimensions for screen mocks, like 19:9. Yet most of older Android phones which users will use still have 16:9 and bottom content usually has to be put into a scrollview not to be cut off. It doesn’t seem like a great choice, what am I supposed to do? Do I change margins based on screen height, force everything smaller, or something else?

How to resolve net::ERR_UNKNOWN_URL_SCHEME in a webview app? How to use intents?

Hi, Im working on developing an Android application based on MVI architecture. Ive attempted to model User Interactions as Action, Reactions and Consequences and come up with the following interfaces and sealed classes

The view model has 3 live data coming in from 3 different api calls. Now, I want to display all the data together as different cards in a list in the recycler view. What would be the best way to do this ? https://stackoverflow.com/questions/67518481/how-to-convert-3-or-more-livedata-into-a-single-flow-in-android

Starting Kotlin 1.5.0, using the following fun interface:

internal fun interface Action<T: Any> {
    val id: String get() = hashCode().toString()
    fun execute(): Result<T>
}

fails on Android with:

com.android.tools.r8.errors.b: Method name '<get-id>' in class '...$reload$1$1$2' cannot be represented in dex format.

Does anyone know if this is a Kotlin or R8 issue?

How to implement this in Kotlin?