kotlinlang #android

android extensions does the binding on the fly (and caches result in activity/fragment). but it also already knows the type. the gotcha with it is that when you use it from something like a recycler view holder

itemView.picker

it will not cache the lookup.

chanzmao

06/29/2017, 3:58 PM

I would have set my custom view inflated from my layout into AlertDialog.Builder’s setView.

nounours

06/29/2017, 5:22 PM

Was wondering, How does Android transforms my input (like tap, swipe…) into a MotionEvent ? Is it done at system level ?

edu_graciano

06/29/2017, 5:24 PM

Hi everyone, I want to add unit tests, what should I use? Mockito, Kotlin test, spek?

ibfrog

06/29/2017, 5:37 PM

I used kluent recently and it was nice to work with https://github.com/MarkusAmshove/Kluent

ibfrog

06/29/2017, 5:38 PM

docucmentation on it could use some work but it was a lot better than dealing with the assertThat(value, `is`(something)) that junit / hamcrest forces you to do if you are writing in kotlin

trevjones

06/29/2017, 5:41 PM

I still like using assertj

edu_graciano

06/29/2017, 5:49 PM

ok, cool I will try those

macmedan

06/29/2017, 7:20 PM

I have a question about

enums

. I have defined one that looks like this

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enum class ChartType(val value: String?) {
    Text("Text"),
    MAP("Map"),
    COLUMN("Column Style 1"),

and want to use this enum in a function like this:

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fun getType():ChartType {
        var type = ChartType(value = currentData?.visualizationName)
    }

But obviously have something wrong (Enums cannot be Instantiated). So my question is how do I do this properly? Do I have to make a

function

with a giant

switch statement

that takes a

String

and returns the

ChartType enum

or is there an better way.

trevjones

06/29/2017, 7:23 PM

try a sealed class

trevjones

06/29/2017, 7:37 PM

or if you still want the values enumerated than yea when statement

hqbao

06/30/2017, 1:56 AM

hi everyone, in kotlin, Moshi or Gson is better for parsing json?

🐶 1

gildor

06/30/2017, 2:08 AM

Same like in java. But for Moshi there is adapter for kotlin - https://medium.com/square-corner-blog/kotlins-a-great-language-for-json-fcd6ef99256b But be careful! It requires kotlin-reflect for work, so probably not the best choice for Android, just because kotlin-reflect is a quite big library

hqbao

06/30/2017, 2:11 AM

@gildor thank so much. i will take a look on your link

blakelee

06/30/2017, 6:48 AM

Has anyone seen this error before

error: Not sure how to convert a Cursor to this method's return type

That is all the information I get even with debug and stacktrace. Edit:I think it's a problem with AS canary 4

budioktaviyan

06/30/2017, 8:29 AM

is there anyone here knows why rx2 and latest kotlin version

1.1.3

makes disposable inferred type become

nullable

budioktaviyan

06/30/2017, 8:30 AM

can you help me @jw ?

m1nd

06/30/2017, 9:37 AM

💥 Hi, I’ve got a weird issue: Currently we a using kotlin version “1.1.1” in our android project. I’d like to update to the the latest version (“1.1.3"). But if I do so and I compile the project I get the following error:

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Error:Uncaught translation error: com.android.dx.cf.code.SimException: at stack depth 2, expected type kotlin.ranges.IntRange but found int
Error:1 error; aborting
Error:Execution failed for task ':app:transformClassesWithDexForStudoDebug'.
com.android.build.api.transform.TransformException: java.lang.RuntimeException: com.android.ide.common.process.ProcessException: java.util.concurrent.ExecutionException: com.android.ide.common.process.ProcessException: Return code 1 for dex process

Has anyone experienced / solved this issue?

stegod10

06/30/2017, 9:40 AM

dear friends hi, any suggestion for learning android development with kotlin?

ihor_kucherenko

06/30/2017, 9:47 AM

https://proandroiddev.com/android-ndk-interaction-of-kotlin-and-c-c-5e19e35bac74

👍 1

iex

06/30/2017, 11:36 AM

how do I add a constructor to a custom view that accepts custom parameters?

iex

06/30/2017, 11:37 AM

val

)

iex

06/30/2017, 11:37 AM

hmm that actually doesn’t make sense

menegatti

06/30/2017, 11:37 AM

fun constructor(context: Context, val yourParameter : Int) : super(context)

iex

06/30/2017, 11:38 AM

but the variable can’t be a val

iex

06/30/2017, 11:38 AM

sorry I should have explained myself better

menegatti

06/30/2017, 11:38 AM

no problem... set to

var

then

iex

06/30/2017, 11:38 AM

yeah, val it’s not possible, because the view can be instantiated from anywhere

menegatti

06/30/2017, 11:38 AM

anyway, you can always use the base constructor for what you need