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Any library to go alongside Espresso for UI testing? I am lost on how to test anything inside a recycle-view properly.

Hi, I want to design a dark theme and checked the material design guidelines about that. Usually you take #121212 as baseline color for the surface and put an overlay of color white with an opacity of 8 (or 9% depending on elevation level) % on it. Can someone please explain me how I can figure out the true color (combination of both)

In this case, it is #272727 which is a mix of #121212 and #FFFFFF (9%).

I also read this tutorial which helps a lot but he didn't explain how to calculate the colors. https://blog.prototypr.io/how-to-design-a-dark-theme-for-your-android-app-3daeb264637

Hi, after updating to Kotlin 1.4, our Android Studio 4.0.1 became super slow at code completion and at noting compilation failures as-you-type. Does anyone had similar issue? It impact productivity so much we will revert the Kotlin update.

After upgrading compile sdk and targetSdk to 29, Parcel.readXXXX and Bundle returns a nullable value. Does anyone know why this change was made?

What jvm does everyone target their kotlin android apps to

@Madalin Valceleanu hello! May I ask you a question about the android-modular-architecture project?

Does anyone use an alternative to Android file transfer they would recommend? (preferably available for macOS)

I came across this in the viewbinding documentation.

Note: Fragments outlive their views. Make sure you clean up any references to the binding class instance in the fragment’s 

onDestroyView()

 method.

Does this mean that using

lazy

as below could potentially leak?

private val binding: SomeXmlViewBinding by lazy {
    SomeXmlViewBinding.inflate(layoutInflater)
}

private val button: View by lazy { binding.button }

Is there a way to know when an application has been closed (swiped away in android recents screen)? I have a foreground service which should survive process death but would stop when the application has deliberately been closed by a user.

Hi all, this is probably a newbie question. but i'm curious to know, whether in kotlin you can call components from other file into main file. i've tried to research about this before, but i can't find any resources that explaining about this stuff. here is the example of what i mean: main.xml

<LinearLayout
   android:id="@+id/linear_main"
   xmlns:android="<http://schemas.android.com/apk/res/android>"
   xmlns:tools="<http://schemas.android.com/tools>"
   xmlns:app="<http://schemas.android.com/apk/res-auto>"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:orientation="horizontal"
   >

   <TextView
			android:layout_width="match_parent"
			android:layout_height="wrap_content"
			android:text="Hello World"
			android:textColor="@color/Black01"
			/>

  /*insert some kind of tag in here to call the id of new_image element from second_file.xml*/



</LinearLayout>

second_file.xml

<LinearLayout
   android:id="@+id/linear_second"
   xmlns:android="<http://schemas.android.com/apk/res/android>"
   xmlns:tools="<http://schemas.android.com/tools>"
   xmlns:app="<http://schemas.android.com/apk/res-auto>"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:orientation="horizontal"
   >

   <ImageView
            android:id="@+id/new_image"
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"
            app:srcCompat="@drawable/button_image"
			/>

</LinearLayout>

do note that the attached code in here is just an simple example code. as i would like to know, if it's possible or not to call only id of textview/imageview from the other xml file, into the main file.

Anyone knows what Android Studio/IntelliJ theme is being used in the jetpack tutorial? https://developer.android.com/jetpack/compose/tutorial

Can anyone help me? I need guidance on how to solve this problem. just guide me to use a design pattern to get rid of the repeated code. https://codereview.stackexchange.com/questions/248415/refactor-method-using-generic-method-or-design-pattern

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is there any good documention or videos on how to include APIs calls into your code?

Thoughts on Jetbrains Compose? I'm working with SwiftUI at the moment and would really prefer to develop UI in the same manner. Is this a good Slack group to stay up to date on Kotlin+Compose developments?

Good day to all! 🙂 My name is Eugene and I'm a product manager at JetBrains. Currently, I look for Java developers who continue to use Java in their production projects. I'd like to learn more about your UCs and why's do you use Java instead of Kotlin. I think most of you have completely switched to Kotlin, but perhaps you know people out of this channel who continue to use Java 🤔 Just DM me and I'll ask a few questions :android: That's it. Have a nice day and happy coding 👩‍💻

I’m not sure if it’s ok to share android-related articles here, but I wrote one and maybe you can find it interesting

I just updated to AS 4.2.0-alpha8 and now getting

ClassNotFoundException: kotlin.KotlinNothingValueException

- anyone else come across this?

I have two fragments. Fragment A implements a listener. when I want to open fragment B, I set this listener directly in it and hold it as a lateinit var. Here is my problem. when i rotate screen in fragment B, I get error that I havent initialize the lateinit variable. How can i solve this?

Hello people, How can I use Kotlinx.synthetic and Kotlin 1.4 I got this error

java.lang.AssertionError: Unbound symbols not allowed
	Unbound public symbol for public kotlinx.android.synthetic.main.fragment_onboard/view

came across this (https://www.reddit.com/r/mAndroidDev/comments/igws6l/of_course_the_first_thing_i_want_to_open_is_the/) and this pretty much happens to me all the time. any way to hide auto generated files from showing up on search/navigation?

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I'm wondering if there is a better (e.g. less code) way to do this, in my ViewModel i want to have a LiveData object that can only be changed from the viewModel it self (e.g. the view should not change it, only observe), I use the next code for this, is there a better way of doing this?

private val _someData = MutableLiveData<String>()
    val someData: LiveData<String> = _someData

hi all, i was wondering if there is a way to set part of text in TextView to bold/italic, without have to use .kt file to do it? all the resources that i found, need the use of .kt file to do it. in example it should be like this: a TextView with text value of "Hello World", i would like to make the word "Hello" to be bold or italic, but i want to do it simply in the xml file, not in the kt file.

AndroidX KTX provides extensions, for example

LifecycleOwner.lifecycleScope()

. However, there are multiple dependencies related to this example:

androidx.lifecycle:lifecycle-livedata-core-ktx
androidx.lifecycle:lifecycle-livedata-ktx
androidx.lifecycle:lifecycle-reactivestreams-ktx
androidx.lifecycle:lifecycle-runtime-ktx
androidx.lifecycle:lifecycle-viewmodel-ktx

(this particular example is listed here: https://developer.android.com/kotlin/ktx/extensions-list#for_lifecycleowner_2) 👉❓ How can I find out which specific dependency provides this particular feature? ❓👈

Hi all - I’m trying to use SharedPreferences in my app in order to save a few preferences that then need to update pretty instantaneously inside the app. I have a settings page, where the user can switch from light to dark mode, and also update the voice of a TTS functionality. When the user ‘saves changes’ - I call editor.putXXXX(key, value).apply() for each setting and then close out of the settings page. Unfortuntately, I neither see the settings changed in my main activity, nor see the updated settings when I go back into the settings page. I understand that .apply() is asynchronous - I suspect that calling .apply() for each setting is going to cancel previous calls to .apply() - am I able to make several “puts” and then call .apply() just the once to make those several changes in one go? Why would I not see immediate changes in my main activity even if I call ‘sharedPrefs.getXXX’ again? I’m assuming it’s just an issue whereby the apply() function hasn’t actually finished yet? I’ve tried Googling and SOing for solutions but not getting anywhere (edited)

Hey all. I’m using the

LiveData.observe(...)

function from the

lifecycle-livedata-core-ktx

library. Today I noticed that I’m getting a warning from Android Studio in regards to this function call. Anyone know what this is about?

Candidate resolution will be changed soon, please use fully qualified name to invoke the following closer candidate explicitly:
public open fun observe(owner: LifecycleOwner, observer: Observer<in ScreenData!>): Unit defined in androidx.lifecycle.LiveData

Is this a bug in LiveData? Steps: 1. Call

liveData.postValue(StateOne)

2. Call

liveData.postValue(StateTwo)

Actual: The LiveData observer only receives

StateTwo

because inside

postValue

, while the

mPostValueRunnable

is being posted from the first call,

pendingData

gets replaced by the second call. Is that expected or should LiveData be posting two separate runnables, one by one?