kotlinlang #android

I'm looking at this example https://github.com/android10/Android-CleanArchitecture-Kotlin for me it is interesting because it is based on viewmodel pattern I see it uses livedata, observe... (ok where can I learn about this livedata programming style?) but I would have expected to see the binding like

<TextView android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@{user.firstName, default=my_default}"/>

where are they in such project? Thanks in advance for your hint!

:google: 1

:stackoverflow: 1

ursus

07/24/2018, 10:59 PM

in fragments, what kind of properties do you use for view scoped things? Like adapters, and actual views .. private val adapter: Adapter? = null and then !! everywhere?

Ayden

07/25/2018, 5:49 AM

Then I wil receive the error state that binding not found.

jermainedilao

07/25/2018, 7:09 AM

Hi! can someone enlighten me why this returns false?

"hello world".matches(Regex("([A-Za-z])"))

Ayden

07/25/2018, 8:46 AM

Guys. What is the difference between model and viewModel?

:stackoverflow: 6

rCorbellini

07/25/2018, 11:46 AM

I am looking for a practical way to convert json string to a map using kotling (I do not have a data class for it as it will be mutable)

aprilledaughn

07/25/2018, 2:01 PM

Hey everyone 😊 We just published a report at Instabug that digs into the last 6 years of our data. We looked at 100 million bug reports from 15 billion sessions, 1 billion devices, and 30,000 mobile apps! This was our first time diving into our data and tbh most of the findings are pretty high level BUT we have so much info that no other company has and there's a lot more we can learn... so it would be great if anyone could take a few minutes to check out the report and share feedback about what kind of questions we should ask next year. What insights would you like to know about aggregate trends in mobile bugs? 🙏 http://bit.ly/2LN8szv

kevin.cianfarini

07/25/2018, 10:33 PM

Is media player the preferred option we have for streaming audio right now?

stegod10

07/26/2018, 8:28 AM

Looking for your suggestion. I just want to draw a path on map and then directive people for that rotate.

Alin B.

07/26/2018, 12:02 PM

Let's say I have a class like

class Event(val actionId:Int, arg1:String, arg2: Int, arg3:MyClass, arg4:String)

but when I use the class, most likely I'll need

Event(actionID, oneOfTheArgs)

Slackbot

07/27/2018, 7:51 AM

This message was deleted.

ahegazy

07/27/2018, 11:33 AM

For me 2️⃣ has an advantage because of the

OnClick

annotation and also the ability to use it in any class like a

ViewHolder

for example

sindrenm

07/27/2018, 12:08 PM

I prefer 1️⃣ because it Just Works™ out of the box and is dead simple to use. However, it does “require” me to give the views IDs in camelCase in the layouts, which I am fine with personally, but I know many others don't like it. With snake_case IDs in layout files, I think I'd prefer 5️⃣, which is what we use at work. We defined a simple

find

extension on

View

that just encapsulates lazily finding the view through `lazy`:

fun <T : View> View.find(id: Int) = lazy(LazyThreadSafetyMode.NONE) { findViewById<T>(id) }

Usage:

<Button id="@+id/some_button" />

class SomeView : View {
  private val someButton: Button by find(R.id.some_button)
}

07/27/2018, 12:12 PM

That's kotterknife. It's a bad idea.

:trollface: 2

🤔 1

😮 2

Erfan

07/27/2018, 6:29 PM

hi guys, I have a free function like this:

fun addQueryStrings(keyValues: Map<String, String>, baseUrl: String): String {
    var url = baseUrl + "?"
    val firstKey = keyValues.keys.first()

    keyValues.forEach { key, value ->
        if (key != firstKey) { url += "&" }

        url += "$key=$value"
    }

    return url
}

and I've received several crash report with this error:

Fatal Exception: java.lang.NoClassDefFoundError
blah.blah.blah.DataLayer.APICommunicatorKt.addQueryStrings

What is wrong here? Is there anything wrong with using free function here? (note: it does not happen on all devices)

tschuchort

07/28/2018, 9:18 AM

Are there other methods in the file?

Adewoyin David

07/28/2018, 8:58 PM

Please where is the best tutorial on kotlin for a newbie

Slackbot

07/29/2018, 7:23 AM

This message was deleted.

Harun

07/29/2018, 10:56 AM

Any good tutorial for MVVM+ retrofit 2 in Kotlin without dagger and data binding for Android

Mark Gilchrist

07/30/2018, 6:43 AM

Does anyone know of a good place to start if you want to implement flatbuffers in kotlin (android client) and php (server)?

Ayden

07/30/2018, 7:14 AM

May I know why I cannot use the

.put

function in the

for

loop?

Ayden

07/30/2018, 7:14 AM

val parameterObject = element?.asJsonObject
val parameters: Map<String, List<String>> = HashMap()
for (entry in parameterObject?.entrySet().orEmpty()) {
    val key = entry.key
    val value = entry.value.asString
    parameters.put(key, value)
}

ursus

07/30/2018, 10:51 PM

Hey, why do @IntDef have to be Long? wtf

thymecypher

07/31/2018, 2:03 AM

@neuber You need to import the package to use it in another source file.

Francesco megna

07/31/2018, 9:48 AM

Hi guys, i have a question about viewModel and fragment, how i can share the same viewModel between more fragments?

Sangeet

07/31/2018, 12:44 PM

I want to know whether kapt support incremental build and dagger supports that ?

rCorbellini

07/31/2018, 7:51 PM

can i apply a delegate on view visibility on element in activity ? (i need make some validation before apply visibility to view)

muralimohan962

08/01/2018, 6:22 AM

How to write a static block in kotlin classes?

Paul Woitaschek

08/01/2018, 8:15 AM

Someone has the same problem that as of the latest android 3.2 betas everything in modules is just displayed as unrecognized?

Ayden

08/01/2018, 11:57 AM

How to replace this

if

statement with Alvis Operator?

if (element == null) {
    return null
}
val validationObject = element.asJsonObject
val validation: MutableMap<String, String> = HashMap()
for (entry: Map.Entry<String, JsonElement> in validationObject.entrySet()) {
    val key: String = entry.key
    val value: String = entry.value.asString
    validation.put(key, value)
}

Title

Ayden

08/01/2018, 11:57 AM

How to replace this

if

statement with Alvis Operator?

if (element == null) {
    return null
}
val validationObject = element.asJsonObject
val validation: MutableMap<String, String> = HashMap()
for (entry: Map.Entry<String, JsonElement> in validationObject.entrySet()) {
    val key: String = entry.key
    val value: String = entry.value.asString
    validation.put(key, value)
}

Lucas Ł

08/01/2018, 12:02 PM

?:

(`e`lvis operator) gives you either a default value or default behaviour https://kotlinlang.org/docs/reference/null-safety.html#elvis-operator The only thing I can see from your snippet that can be null is

element

val validationObject = element?.asJsonObject ?: JsonObject()
val validation: MutableMap<String, String> = HashMap()
for (entry: Map.Entry<String, JsonElement> in validationObject.entrySet()) {
    val key: String = entry.key
    val value: String = entry.value.asString
    validation.put(key, value)
}

if you don't want the code below do an 'empty run' you can also just do something like:

val validationObject = element?.asJsonObject ?: return

if your function doesn't return any value

View count: 2