kotlinlang #announcements

i’m looking for an android application (source) which uses fragments dynamically/at runtime. official java tutorials for android and other resources i’ve found are always missing some part. i’d like to learn from a full example using the best practices for kotlin/android, any suggestions?

Dizarray

12/04/2017, 4:28 AM

Hi, I have this code:

class DefaultList(val name: String = "", val friends: List<String>)
    
    class ListDefault(val friends: List<String>, val name: String = "")
    
    fun foo() {
        val instance = DefaultList(arrayListOf("blah"))
        val another = ListDefault(arrayListOf("blah"))
    }

Line, where I create

instance

variable doesn't compile. But line with creating

another

variable is ok. Do I really need to have a variable with default value at the end of primary constructor or is it a bug?

kirillrakhman

12/04/2017, 8:45 AM

there's a 2017.3.1 EAP. the changelog said something about freezes

qwert_ukg

12/04/2017, 9:31 AM

or maybe somebody can advise a good java lib for it?

qwert_ukg

12/04/2017, 9:45 AM

what do think guys, about this lib https://github.com/KDatabases/Kedis

👎 2

rrader

12/04/2017, 10:10 AM

Why in Kotlin companion objects can implements some interfaces, what benefits this can have? When is useful to use this feature?

Dario Pellegrini

12/04/2017, 10:41 AM

@qwert_ukg look interesting. I must try it!

alexcouch

12/04/2017, 3:40 PM

For some reason I can't seem to get line breaks in my kotlin documentation

snowe

12/04/2017, 5:34 PM

incomes:
    HOURLY_SALARY_BASE_WAGE_INCOME:
    - types: "PAYSTUB"
    - types: "W2"

bkenn

12/04/2017, 7:59 PM

Hi all. I'm trying out the multi-platform feature and I am getting the following error.

Error:(3, 1) Kotlin: The feature "multi platform projects" is experimental and should be enabled explicitly.

I cannot find any documentation on where to enable multiplatform build. I tried

kotlin {
    experimental {
        multiplatform 'enable'
    }
}

but this doesn't work. Anyone run into this issue?

bj0

12/04/2017, 8:46 PM

removeAt

implies passing an index though ?

👍 1

karelpeeters

12/04/2017, 8:48 PM

@Czar How would I use that?

karelpeeters

12/04/2017, 9:04 PM

As I'm doing right now:

tipList = tipList.dropAt(index)

karelpeeters

12/04/2017, 9:06 PM

You can make "non-structural modifications". I'm still amazed by how well the Java Collections are designed and specified.

➕ 2

karelpeeters

12/04/2017, 10:45 PM

For you specific use case:

if (str.isNullOrBlank()) "other" else str

pniederw

12/05/2017, 1:41 AM

@blakelee did you read https://kotlinlang.org/docs/reference/generics.html#use-site-variance-type-projections ?

qwert_ukg

12/05/2017, 7:44 AM

can u compile it?

oblakr24

12/05/2017, 8:58 AM

Hi IntelliJ(/AndroidStudio) Kotlin plugin team, currently, autogenerating of objects implementing interfaces (say, in method calls when you want to provide an implementation of a callback interface) does not work in Kotlin (it works fine in Java). Is this a known issue and are there any plans to include this?

pdegand

12/05/2017, 10:59 AM

Hi, generic Java/Kotlin question: Can I always swap the usage of a

ByteArray

to a

String

and the otherway arround ? I'm doing some crypto and

Cipher

is using

ByteArray

as its input but i want to put the input inside a

data class

and

data class

are not happy with

Arrays

. So can i simply convert the the ByteArray to string to store inside my data class and re-convert the string to bytearray when i need to pass it to a cipher ?

r4zzz4k

12/05/2017, 11:39 AM

Is there any information on UAST besides IDEA and lint source code?

nfrankel

12/05/2017, 2:20 PM

anyone tried to use the kotlin ant task? it uses the

KotlinAntTaskUtil.kt

file under the cover which checks for the existence of files, not classes on the classpath 1. i’ve to rename files and lose versions, i can live with that 2. i cannot use the embeddable compiler, and run into classpath issues regarding conflicting guava versions ok, this is very specific still, hints appreciated

danielspeixoto

12/05/2017, 9:06 PM

Does anyone knows a good lib for Mongodb?

g4sarma

12/05/2017, 10:23 PM

Guys was this ever fixed https://stackoverflow.com/questions/1503284/java-system-getpropertyuser-home-returns?

edwardwongtl

12/06/2017, 8:17 AM

Just a quick survey, what library do you use for unit test? Plane old jUnit or anything else?

kael

12/06/2017, 11:36 AM

I managed to miss the AMA by mere minutes, so I'm hoping this is the right channel to ask this question. Is it possible (or are there plans) to have some sort of Swift-style

deinit

in Kotlin/Native?

arild

12/06/2017, 12:35 PM

I would like to hear opinions on explicitly returning Unit from a method to indicate an intentional no-op implementation, e.g.

override fun onCompleted() = Unit

👍 1

noncom

12/06/2017, 2:41 PM

what library for client-side HTTP requests would you recommend for Kotlin?

Title

noncom

12/06/2017, 2:41 PM

what library for client-side HTTP requests would you recommend for Kotlin?

natpryce

12/06/2017, 3:52 PM

We’re using http4k over apache http client. http4k uses the same API for incoming and outgoing requests, which is very handy when writing proxies, or even common utility code that can be applied to any http message

napperley

12/06/2017, 8:47 PM

Alex - Are you referring to a HTTP client on the server-side?

noncom

12/07/2017, 9:39 AM

@natpryce wow, thanks! for some reason searching for Kotlin http client libraries only revealed the Fuel library which we are currently using, but which is not actively maintained and gives us big surprises from time to time

@napperley not sure what is a HTTP client on a server side 🙂 Maybe there is a typo. What I mean is that I have a desktop application that needs talking to REST APIs over the network, and that I am looking for a Kotlin library to help me implement this part

deviant

12/07/2017, 11:09 AM

Retrofit

➕ 1

noncom

12/07/2017, 4:23 PM

hmmm, Retrofit uses annotations a lot

and that would mean that everything is hard-coded at compile time

in the project I am currently developing, the API interfaces should be built from random dynamically updated specs and should be made available in various scripting languages, like Lua and other

I am not sure how to tie this up with code on annotations

deviant

12/07/2017, 5:25 PM

retrofit is extremely flexible

anyway you can use okhttp directly if you dont need rest client

noncom

12/07/2017, 10:31 PM

Yeah! Gonna try Retrofit too. First-hand experience would be great!

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