like

git clone <https://github.com/googlesamples/android-architecture/>

the projects are not in there they are on ‘feature branches’

I found the instructions

something crazy here but… someone opened an issue

make sure you assign a value to your lateinit value before you access it

I would suggest to not use lateinit when possible. Make

viewAdapter

nullable instead

Hello guys, I've got a build error with Gradle.

During the build I get the following error:

> Task :app:kaptGenerateStubsDebugKotlin
e: error: cannot access Retrofit
  class file for retrofit2.Retrofit not found
  Consult the following stack trace for details.
  com.sun.tools.javac.code.Symbol$CompletionFailure: class file for retrofit2.Retrofit not found

The problem is that that class is present inside the following dependency:

implementation "com.squareup.retrofit2:retrofit:$retrofit_version"

When I switch from

implementation

to

compile

, the error disappears. What could it be?

implementation is runtime only

If I switch to

compile

, the error moves to another dependency

ok so one, this is not kotlin specific. two I should clarify. implementation is described to down stream as runtime only

Thank you

seems like a kapt bug, or misconfiguration

is there any tool that can visualise dependencies (imports) so I can start multimodularizing?

gradlew --$MODULE:dependencies gives you the dependency list, module-wise

I am trying to import a sealed class from a library, but AS is not recognizing the import when the library comes from maven... if I use a local project it works... any ideas ? I already tried invalidate cache and restart

I tried to compile in the command line and it failed... but opening ValidationStrategy shows that the class is there

sealed class ValidationStrategy(val onEnable: Boolean, val onDisable: Boolean) {
    ...
    /**
     * Flag to start validating the form only after the first submit event.
     */
    class AfterSubmit(onEnable: Boolean, onDisable: Boolean) : ValidationStrategy(onEnable, onDisable)

  ...
    companion object {
        val ALL_TIME = AllTime(true, true)
        val AFTER_SUBMIT = AfterSubmit(true, true)
        val ON_SUBMIT = OnSubmit(false, false)
    }
}

Context.getDrawable(int)

is annotated

@Nullable

, but the documentation doesn’t really explain how that could happen. It returns an object, or throws an exception. Is the annotation wrong, or what conditions would it return null?

You could be using a resource from a library not configured in proguard. Also, not Kotlin related! try joining android-united.slack.com for android-only questions

well, the only reason i noticed this is because i’m calling the API from kotlin. in java, i’d just treat it as not null, but that’s not possible in kotlin

What are you trying to do?

not have to handle nulls if they’re not possible

docs say it will throw an exception if it can’t be found

just use

?.let { }

and be done with it?

no, i’d then need a fallback drawable - can’t just show nothing

and littering a codebase with

?.let {}

when things can’t actually be null (which is my suspicion) isn’t great kotlin

?.let {} ?: run {}

or

try/catch

🙂

the problem here is the annotation in the method, it defines the return type as Drawable?, so if you don't want to spread null checks across the code, you would have to wrap the getDrawable method and control the null possibility there, returning a default drawable.

or you could use the getDrawable(id : Int, theme : Theme?)