kotlinlang #android

I have list of events in recyclerview and in each row I want to show the time elapsed since the event with precision to seconds. The event objects have property time as Instant (from java8 datetime api). How can I update the time data every second?

:stackoverflow: 3

rwachol

05/22/2017, 3:32 PM

@ihor.kucherenko nice. why not databinding ? not complaining, just want to know if there’s some issue 🙂

zak.taccardi

05/22/2017, 4:49 PM

with official kotlin support in 3.0, do you still need to apply the

kotlin-android

plugin?

khacpv

05/22/2017, 5:06 PM

Hello, I'm trying Kotlin today. ✨ ✨ Seem

kotlin-android-extensions

only support for productFlavours without buildTypes. import

kotlinx.android.synthetic.debug.activity_main

but not success. How do you know use the plugin with buildTypes (ex: debug & release)? 🙌

ra1nmak3r

05/22/2017, 10:42 PM

What to use instead hungarian notation?

blakelee

05/23/2017, 6:14 AM

How do I convert this to a lambda?

viewModel.getClasses().observe(this, object : Observer<MutableList<Classes>> {
            override fun onChanged(classes: MutableList<Classes>?) {

            }
        })

Kotlin is yelling at me about the

object : Observer<MutableList<Classes>>

part Is this the same as the previous?

viewModel.getClasses().observe(this, Observer<MutableList<Classes>> {
            it?.let { classAdapter.notifyDataSetChanged() }
        })

chris.zou

05/23/2017, 8:17 AM

Hi there, I wonder if there is a way that I can calculate the diff between two objects? Say, I have a

person1 = Person(name = "chris", age = 18)

, and

person2 = Person(name = "chris", age = 20)

, Is there a way that I can check the diff between person1 and person2 is property

age

, besides checking the properties one-by-one myself?

smuldr

05/23/2017, 9:06 AM

I'm trying to update to kotlin 1.1.2-4, but getting this error:

* What went wrong:
Circular dependency between the following tasks:
:dto:compileReleaseKotlin
\--- :dto:kaptReleaseKotlin
     \--- :dto:compileReleaseKotlin (*)

Anyone else with the same issue?

igroeg

05/23/2017, 9:24 AM

I'm java dev and want to develop some android apps. Whit what language should i start? Kotlin or Java? Please have in mind that i'll need some reaources, tutorials and support from the community.

audhil

05/23/2017, 12:37 PM

Hi, is there a simple way to add spinning progress bar in all activities/fragments for sometime. I'm not a fan of adding progress bar in all layout files. any suggestions? anything different you tried.

myanmarking

05/23/2017, 12:56 PM

you can, for example, create a method in a base class, that find the rootView and add it programatically when showing, or remove it when hidding

ihor.kucherenko

05/23/2017, 5:02 PM

“Android Architecture Components” https://medium.com/proandroiddev/android-architecture-components-cb1ea88d3835

👍🏼 2

05/23/2017, 5:11 PM

we don't bind anything in fragments, dialogs, or activities

Daniel

05/23/2017, 9:19 PM

Might I ask how you guys use a logging framework in code that has to be unit tested? Standard Android Log. provokes the not mocked exception.

janechung

05/23/2017, 11:14 PM

Has anyone run into kapt causing Circle to fail by exceeding the 4G memory limit? (sorry if this has already been asked)

vmironov

05/24/2017, 1:25 PM

removeOnGlobalLayoutListener(this)

alex.hart

05/24/2017, 4:09 PM

What is the actual output of the exception? It should tell you a little more than “what chunk of code” it happens in

yperess

05/24/2017, 4:29 PM

Does anyone know how I can use Dagger 2 to inject dependencies for an object? I'm looking to do something like: data API { @Inject val Auth: AuthenticationApi } Then have AuthenticationApiImpl for the actual implementation. Then in testing be able to provide a new dependency that injects MockAuthenticationApiImpl instead. I can't send to get an ApiModule working for the injection.

myanmarking

05/24/2017, 4:41 PM

but why not

data API(val auth: AuthenticationApi) ...

05/24/2017, 5:18 PM

@kirillrakhman use

@JvmSuppressWildcard

to get rid of the extends

kirillrakhman

05/24/2017, 5:24 PM

I tried the following:

@Binds @IntoMap @ClassKey(UserViewModel::class)
        abstract fun bindUserViewModel(vm: UserViewModel) : UserViewModel

        @Binds @IntoMap @ClassKey(UserViewModel::class)
        abstract fun bindUserViewModel(vm: UserViewModel) : ViewModel

        @Binds @IntoMap @ViewModelKey(UserViewModel::class)
        abstract fun bindUserViewModel(vm: UserViewModel) : UserViewModel

        @Binds @IntoMap @ViewModelKey(UserViewModel::class)
        abstract fun bindUserViewModel(vm: UserViewModel) : ViewModel

where

@MustBeDocumented
@Target(AnnotationTarget.FUNCTION)
@Retention(AnnotationRetention.RUNTIME)
@MapKey
annotation class ViewModelKey(val value: KClass<out ViewModel>)

mg6maciej

05/24/2017, 8:39 PM

:kotlin:otlinize! #inlinereified

inline fun <reified T : ViewModel> FragmentActivity.getViewModel(key: String? = null): T {
    val provider = ViewModelProviders.of(this)
    return if (key != null) {
        provider.get(key, T::class.java)
    } else {
        provider.get(T::class.java)
    }
}

usage:

userViewModel = getViewModel()

instead of:

userViewModel = ViewModelProviders.of(this).get(UserViewModel::class.java)

👍 1

:kotlin: 4

Paul Woitaschek

05/25/2017, 9:10 AM

Because one is a phone and the other isnt?

🤔 7

rwachol

05/25/2017, 9:19 AM

Hi. I have a problem with kotlin and android - sometimes I need to compile my project twice to see my changes (maybe something to deal with cache) Does anyone else have this problem too ?

ravidsrk

05/25/2017, 12:43 PM

My sample kotlin architecture is here. This sample has example for UnitTests and Espresso tests as well. https://github.com/ravidsrk/android-mvp-kotlin-starter

👍 1

manzar

05/25/2017, 5:26 PM

Can anyone suggest me free video tutorials for learning kotlin?

rwachol

05/26/2017, 8:13 AM

can anyone recommend mocking library for kotlin ?

Title

rwachol

05/26/2017, 8:13 AM

can anyone recommend mocking library for kotlin ?

David W

05/26/2017, 11:41 AM

rwachol: Either Mockito or JMockit

rwachol

05/26/2017, 11:41 AM

I had problem with final classes but got through

David W

05/26/2017, 11:41 AM

I've used both and Mockito is more popular and I find it easier to use, plus it has a library for easier kotlin use

rwachol

05/26/2017, 12:05 PM

yes, I was using mockito in that project but I was wondering if I’d have to add powermock too

David W

05/26/2017, 12:06 PM

nope, there is an experimental extension for mockito that you can use

let me find the doc on it

in short, it lets you mock finals without powermock

https://github.com/mockito/mockito/wiki/What%27s-new-in-Mockito-2#unmockable

there ya go

Mocking of final classes and methods is an incubating, opt-in feature. It uses a combination of Java agent instrumentation and subclassing in order to enable mockability of these types. As this works differently to our current mechanism and this one has different limitations and as we want to gather experience and user feedback, this feature had to be explicitly activated to be available ; it can be done via the mockito extension mechanism by creating the file src/test/resources/mockito-extensions/org.mockito.plugins.MockMaker containing a single line:

mock-maker-inline

i use it and have no trouble using it with kotlin

rwachol

05/26/2017, 12:37 PM

yeah I’ve seen that. makes compilation longer

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