hi everyone, happy new year I has been learning the Android, So could you suggest me the Architecture MVVM of Kotlin (demo or app) used the RxJava2+ Databinding Thanks so much !

Hi all, every time that I’m adding new instrumentation tests file with kotlin and try to run the test, Android studio try to run it as Juint test is anyone face this issue? in order to overcome this issue I’m editing the configuration to be instrumentation but i prefer that the studio will know it for me 🙂

guys why doesn't lint apply when using

map.getOrDefault()

which is only supported if JDK 8 is used? also here is an article about that: https://proandroiddev.com/kotlin-youve-broken-my-heart-ea0e8f991b70

Hi guys. Any good tutorials to learn kotlin with android ??

@Sudhir Singh Khanger

mutableListOf

is a constructor of mutable lists,

MutableList

is type

Have you seen

Warning: stripped invalid locals information from 1 method.

Some warnings are typically a sign of using an outdated Java toolchain. To fix, recompile the source with an updated toolchain.

when compiling with D8?

Hello Guys I have a rather strange problem. When I write an androidTest in Kotlin and try to run it it asks me to choose between two run configurations: Unit Test and Instrumented Test. This is not the case with java where it autodetects the instrumented run config. Does anybody also has this problem?

Hi, does anyone know of a way to dynamically generate AndroidManifest elements at compile time? I'm thinking of a way to make a kapt library automatically register some generated components in the manifest

Not strictly Kotlin-related, but for folks who wrangle a lot of source-sets in Android Studio 3.0+, where different productFlavors represent quite different apps to the user, have you had any “lessons-learned” or best-practise moments?

@jw tried EAP. works fine. Thanks 😄

I pasted the file into the class, but it did not convert directly. Is there any option that should be enabled?

How to detect if my activity has been obscured

Having some issues with lateinit property and the recreation of a killed Activity and its fragments... I'm initializing this property in

Activity.onCreate()

, then adding the

Fragment

, which uses this property in its

onCreate()

When the Activity is recreated after being killed, it first creates its fragments again, causing

Fragment.onCreate()

to be called before the initialization in

Activity.onCreate()

. Is there any way to fix this, or is my design wrong? I've posted this on SO as well: https://stackoverflow.com/questions/48112311/lateinit-property-not-initialized-when-activity-is-re-created

Hi what static analysis tools are you using for kotlin on Android.. detekt?, ktlint or anything else

Android Studio 3.0.1 started to produced warnings like this one:

Warning: Stripped invalid locals information from 1 method.

Methods with invalid locals information:
  java.lang.Object kotlin.collections.SlidingWindowKt$windowedIterator$1.doResume(java.lang.Object, java.lang.Throwable)
Some warnings are typically a sign of using an outdated Java toolchain. To fix, recompile the source with an updated toolchain.

Cannot figure out what changed…

Is it better to use a kotlin coroutine or just to use the thread API in Android? I've been thinking of what is the "smart" way to prevent my grabcut() call from breaking the UI thread.

Hi all, what is the best name for a function that shows an indefinite Snackbar according to you?

snackForever(…)

,

snackForLife(…)

,

snackOfYourLife(…)

, or something else? (:thread-please: )

@evan The name of my library is "Splitties". It means all features are split in small, mostly independent modules, to keep the dex count as low as practically doable. I try to do so without increasing dex size by inlining big methods without lambdas. So I think I'm on the right path for small footprint, but I want to do the right naming choices and support the API for the long term

Can a MutableList have items of two different (object) type? If not what are my alternatives?

Guys, please, use threads for any question instead of simple message 🐵 🙈 🙉

I think it would be useful if the kotlin converter replaces 「if(!TextUtils.isEmpty(s))」 with 「 if(s?.isNotEmpty()==true)」. (also inverted conditions are 「if(TextUtils.isEmpty(s))」 with 「if( s?.isEmpty()!=false) 」.) Because the latter performs a null check and safe cast.

I have hundrets of

!!

because of that ^^

Hi everyone! I want to use Kotlin extension function to remove

if(Build.VERSION.SDK_INT)

from my code. I've created this:

inline fun <T> T.applyForOreoOrAbove(block: T.() -> Unit): T {
  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
    block()
  }
  return this
}

Unfortunately, Android Lint still complains that call requires... Is it a bug in the Lint or am I doing something wrong?

Hi, is there any known issue with Espresso tests written in Kotlin recognized as UnitTests instead of Android Instrumented Test? I cannot run any Kotlin written test...

@josefrichter Yes, support library, plus use minSdk androidmanifest.xml and/or build.gradle. ref: https://developer.android.com/guide/topics/manifest/uses-sdk-element.html

Hi all, what would you choose?

inline fun View.onClick(crossinline l: (v: View) -> Unit) = setOnClickListener { l(it) }

inline fun View.onClick(noinline l: (v: View) -> Unit) = setOnClickListener(l)

The first one is optimized but doesn't gives you a proper stacktrace for the

l

lambda in case you want it, if you get an exception for example. The second one generates 2 classes instead of one, and has 3 methods calls instead of one when a click strikes, but you see it all in the stacktrace, with the exception source. Note that the second one still produces meaningful method and class names. Just the line number is plain wrong and misleading (not hard to figure out you can't trust it).

MainActivity$onCreate$$inlined$onClick$1.onClick

I update TestRule but seem like it doesn’t work well

What is the

view as Button

means?