Hey guys, I'm using Butterknife in a mixed Java/Kotlin project. I'm used to declare views as

lateinit var

ex.:

@BindView(R.id.swipe_refresh_layout) lateinit var swipeRefreshLayout: SwipeRefreshLayout

, that's fine right? To be able to show the loading animation of SwipeRefreshLayout programmatically, I use this method:

fun showLoading() {
        <http://swipeRefreshLayout.post|swipeRefreshLayout.post>({ 
            swipeRefreshLayout.isRefreshing = true 
        })
    }

This is inside a fragment, inside a viewpager/tabs. Thing is, I have a case (I supposed that it's because I unbind in onDestroyView) where sometimes the swipeRefreshLayout variable is null once inside the post block. It seems it has to do with the tab/fragment not being visible so I thought I'd check inside post if (isAdded) but no luck there. Any idea?

Anyone here tell me how to calculate simple interest in Kotlin..

As I cannot find anything on the net: What do I have to consider when writing a library in Kotlin which then should be integrated into a pure java Android project? How can I avoid the implementing apps to include Kotlin support in their projects?

If more devs pick kotlin first then it over time won't be an issue If your lib is in kotlin. Especially for supporting multiplatform

Need help with integration Realm database и

kotlinx.coroutines

. Channel in the listener has

sClosedForSend

is true. Can i keep channel active? Sample:

they discuss creating a static field which is only available within the file, but I can't tell if they're saying sharing an instance is a bad idea

Can some one tell me the meaning of *object : * meaning

are you missing the 'else' statement?

Hi guys, I'm having a problem with Room TypeConverters and Kotlin (I guess it's just a Room issue but since I'm using Kotlin for that, I consider it a Kotlin issue as well). This is the class I'd like to persist or a shorter version of it:

@Entity
data class Customer(
@PrimaryKey
var id: Int,
var name: String,
var paymentAccounts: List<PaymentAccount>,
var addresses: List<Address> )

What we want to acheive is a generic solution for TypeConverters. This is the first not-a-100%-correct solution we came up with:

fun <T> fromList(list: T?): String? {
list?.let {
val gson = Gson()
val type = object: TypeToken<T>(){}.type
val json = gson.toJson(list, type)
return json
} ?: run {
return null
}
}

fun <T> toList(json: String?): T? {
json?.let {
val gson = Gson()
val type = object: TypeToken<T>(){}.type
val list = gson.fromJson<T>(json, type)
return list
} ?: run {
return null
}
}
@TypeConverter
fun fromPaymentAccountList(list: List<PaymentAccount>?) = fromList(list)
@TypeConverter
fun toPaymentAccountList(json: String?) = toList<List<PaymentAccount>>(json)
@TypeConverter
fun fromAddressList(list: List<Address>?) = fromList(list)
@TypeConverter
fun toAddressList(json: String?) = toList<List<Address>>(json)

With this approach we have only one big problem: no compilation errors, no other errors BUT all the properties in the data class are converted to `LinkedTreeMap`s instead of proper objects. Our Customer class fortunately is not so complicated but we have other classes with list of objects and each object contains another list of other objects. It makes no sense to me to write a converter for each type that I want to persist with Room. Is there a solution to this problem? p.s.: we've also tried to create a generic TypeConverter method by using a reified generic with inline functions but at build time, we had multiple convertion errors

The

TypeToken<T>(){}

will only be a TypeToken<Object> because of type erasure.

Hi can anyone help me making a user interface like twitter ??

Hey can any one send me PDF file to learn kotlin

If I want to code in kotlin then there is any base language to first learn to perform and action on this guy's !?

Is there a possibility the debugger hasn’t been attached yet? You should see a checkmark (or

X

) on that red dot if everything is indeed setup properly

Could someone help me using kotlin with androidInstrumentationTests? I'm getting a "cannot mock final class" exception. I got it working with unit tests with the MockMaker solution, but I'm having trouble with the android tests.

Complete noob at android.. I'm writing a desktop kotlin app which will require a small database, i'd also like to make an android counterpart. sqlite seems to be the DB to use on android, can it also be used okay on desktop so i can share a lot of code?

I’ve currently ended up doing (much simplified)

async(UI) {
delay(10)
viewState.onNext(...)
}

I guess an alternative to delay would be

bg { Thread.sleep(10) }

?

meaning from the same reference for View that I pass to the presenter, a showDialog method would be also available

presenter fun just takes some number of channels from the view and returns a view model that holds some number of channels the view needs to listen on

This message was deleted.

Why Android KTX? https://android-developers.googleblog.com/2018/02/introducing-android-ktx-even-sweeter.html Wouldn’t it be better to maintain the same coding style on all platforms?

Is it possible in android studio to generate the lambda required for a parameter argument? What I used to do was type new Fuction3() and then use the tools to transform it into a lambda. What I’d love to be able to do is ctrl space and get the template put in place for the lambda. Especially when I’m using rxjava and

withLatestFrom(o1, o2)

Any Realm users? I have a question about inserting data.

This message was deleted.

val currentUser = mAuth!!.currentUser what means ‘!!’ ??

you work with mutableList or ArrayList?

but If u have to put into a bundle?

You have to cast to ArrayList and setParcelableArrayList?

Hi everyone, is there a way to have api documentation for kotlin like javadoc?