Dispatchers.IO defaults to being backed by an executor that can spawn up to 64 threads. Is it possible to architect an app with suspending non-blocking IO calls and we'd just use one thread for the IO dispatcher? Is it a reasonable expectation that migrating to coroutines+flow from rx will reduce the total number of threads an android application uses? This is the high-level question I am trying to answer.

📚 Android Sample App using modular, clean, scalable, testable Architecture written in Kotlin that presents modern 2019 approach to Android application development, latest tech-stack and best practices. Application is based, apply and strictly complies with each of the following 5 points: • A single-activity architecture, using the Navigation component to manage fragment operations. • Android architecture components, part of Android Jetpack give to project a robust design, testable and maintainable. • Pattern Model-View-ViewModel (MVVM) facilitating separation of development of the graphical user interface. • S.O.L.I.D design principles intended to make software designs more understandable, flexible and maintainable. • Modular app architecture allows being developed features in isolation, independently from other features. For more technical details please check the project readme. Project link: https://github.com/VMadalin/kotlin-sample-app

Good way of doing this (a library or article or any pointer, I use Alert Dialog atm but it's not exactly for this job) (When you long hold on whatsapp this popsup)

Hi, first time poster and newbie to Android/Studio, (but a greybeard otherwise 🧓) I’m trying to understand threading with cooroutines and found the AS Debug Tool Window: Frame: Thread drop down rather cryptic. The documentation (https://www.jetbrains.com/help/idea/debug-tool-window-frames.html#status) is not too helpful

The status and type of a thread is indicated by a special icon and a textual note next to the thread's name.

and googling is not much better. So how do I parse

"pool-2-thread-1 @coroutine#3"@4514 in group "main"

? What is

@4514

? and what is

group "main"

? Doing a thread dump, at the top of the stack for this thread is

"pool-2-thread-1 @coroutine#3@4514" prio=5 tid=0x10 nid=NA runnable

, so this is not on the main thread:

"main"@1 in group "main"

with thread dump:

"main@1" prio=5 tid=0x1 nid=NA waiting

Cheers, Daniel

I am setting credentials in my build.gradle.kts file. But I want to read the credentials from a json or gradle file, because I want to integrate with Jenkins. I am also open other solutions.

repositories {
    maven { setUrl("<https://urbanairship.bintray.com/android>") }
    maven { setUrl("<https://clojars.org/repo/>") }
    maven {
        setUrl("<https://jfrog.io/>...")
        credentials {
            username = "..."
            password = "...."
        }
    }
    mavenCentral()
}

For those familiar with Room, is there a way to setup a 1-1 unidirectional relation? It seems every example I find assumed bidirectionality.

I imported my kotlin library to my old java app and i got this error. Anyone encountered this before?

In which way is the new experimental ViewBinding feature better than Android Kotlin Extensions for accessing views, by their ID? Except for type safety and null safety, are there any speed improvements?

In android, if I launch a coroutine from my fragment to collect a flow. Should I be calling this with

launch

,

launchWhenStarted

or

launchWhenResumed

. Assuming I’m calling this in the fragment’s

onViewCreated

viewLifecycleOwner.lifecycleScope.launchWhenResumed { }

Is there anyone here who has applied or works with https://turing.com ?

Anyone have experience with Mockito being an idiot?

Can someone tell me how to update? I downloaded Android Studio 4.0 and gradle hints me that anohter kotlin update is available, but i cant install it

https://stackoverflow.com/questions/59123938/my-menu-item-in-my-fragment-is-acting-weird-not-displayed-properly if anyone can help

I'm not sure where to ask this question, but does anyone know what tool would generate those XML files that describe the apps icons? They are described as vectors

Offtopic : Does anyone know how to get to Android United slack? I'm requesting the invites for quite some time and no response. Or do you know any other active android slack community?

Hi everyone. Is there any nice Android Unit Testing or TDD course available?

Im confused as when is java8 bytecode / jdk available

Does anyone know the best article for Koin DI Framework. Can't seem to find any that has a clear explanation and real examples. Thanks.

is anybody trying out the jetpack compose stuff? it doesn't seem to work with LiveData... at least, not how i'm trying to use it! there is only 1 page on the internet dealing with this combination...

Hi! Would anyone have a recently implemented

IntentService

using Coroutines and built on top of a

LifecycleService

?

Hello, is there a way in Kotlin to use property delegates for data classes in constructor? I want to create something like Swift's

Property Wrapper

and This class i'm using to convert Firstore snapshot listener to live data, here as i told above listener inside

onActive

is called immedietly but it won't update

value

of live data until

suspending

task inside other

ViewModel

finished

class DocumentLiveData<T>(
    private val documentReference: DocumentReference,
    private val typeClass: Class<T>
) : LiveData<T>() {
    override fun onActive() {
        super.onActive()
        listener = documentReference.addSnapshotListener(changes) { documentSnapshot, exception ->
	    //this listener is called but `value` is not updated immedietly
            if (exception == null && documentSnapshot?.exists() == true) {
                value = documentSnapshot.toObject(typeClass)
            } else {
                value = null
            }
        }
    }
}

Hey guys, i was wondering why we can't inject the Viewmodel directly, but instead we've to inject a factory. Which ate the benefits came from this practice?

Hi folks, does anyone know if there are any proguard rules which need to be used when using the @Parcelize annotation?

Hey guys, could anyone tell me why my app crashes when I'm in flight mode and making an API call via retrofit? shouldn't it just return null, or does it throw some exception which I don't know?

Hey guys, problem with vector drawables and styles. So I have two options, etiher use android:src or android:background to set the vector image. The src allows me to change the tint of the drawable but not the size, while background lets me set the size but not the tint. Any way to change both color and size in xml style?

<style name="ImageButtonStyle" parent="Widget.AppCompat.ImageButton">
        <item name="android:color">@color/secondaryColor</item>
        <item name="android:tint">@color/secondaryColor</item> // works as its src now
        <item name="android:layout_width">80dp</item> //doesnt work
        <item name="android:layout_height">80dp</item> // doesnt work
        <item name="android:background">@android:color/transparent</item>
    </style>

android:src="@drawable/ic_favorite"

Hey guys, I am looking for a good library for my case. I have a

Browse

button in my activity. When user click it, I want to let user pick image(s) from the gallery. Also, I want user to be able to take photo(s) from that. Do you know any library that handles these cases? Thank you.

Hey guys, by default, the Android Studio helps converting 1 single svg file to vector drawable. I am looking for a formal lib which help convert SVG files to vector drawables (.xml) file only by 1 manipulation. I found a lib on stackOverFlow (https://github.com/ravibhojwani86/Svg2VectorAndroid/blob/master/Svg2VectorAndroid-1.0.jar)

<https://stackoverflow.com/questions/41190803/is-there-a-way-to-bulk-convert-svg-files-using-android-asset-studio>

Is that any formal lib from google??? Many Thanks

Hello Android devs! I'm looking into writing a navigation library (expressing navigation routes as a Kotlin DSL), and I'm interested to hear what kind of funky situations you get your navigation stack into. Obviously there's "go to X" or "go back", but the more complicated examples that I'm interested in are about screens presenting nested screens, back-stack manipulations, and understanding the "types" of navigation. The examples I can think of off the top of my head are: • A bottom tab bar Activity presenting several different fragments • An activity presenting two fragments in a Master/Detail flow • A "sign up" flow that tracks and displays progress through completing several child forms • A dialog that pops over a screen and tracks some kind of navigation through a flow or tabs as above • An Activity/Fragment that wants its parent Activity/Fragment to display a snackbar after it has completed (i.e. "XXX has been saved [view]") • Navigation "types" of "forward from this screen" or "on top of this screen" or "replace this screen" If you're not doing anything interesting with your navigation, I'm also interested in hearing whether or not you often pass messages back to a parent screen once the child has finished doing something (via onActivityResult, a message bus, or any other way). Your thoughts and examples are much appreciated!