kotlinlang #compose

undergo state restoration as usual? (i.e. is their state actually written to the save state bundle during config changes and is it restored afterwards?) Asking because a

WebView

inside an

AndroidView

will have its content reloaded at any configuration change, no matter if I call

webView.loadUrl("...")

inside `AndroidView`’s

viewBlock

update

params. Same goes for a

RecyclerView

inside an `AndroidView`: Scroll position is not restored on configuration changes. I also tried putting a custom view inside an

AndroidView

and I could verify its

onSaveInstanceState()

method is called during config changes but its

onRestoreInstanceState()

is not.

steelahhh

02/12/2021, 3:43 PM

Can't seem to work around it, and considering that this was fine on alpha11, created an issue: https://issuetracker.google.com/issues/180021390

Shakil Karim

02/13/2021, 5:57 AM

Why compose app feels sluggish almost like flutter, is there any tool for measuring the performance of composable like IOS have for SwiftUI?

➕ 4

lewis

02/13/2021, 10:26 AM

What's the recommended way of creating a

ViewModel

that has constructor dependencies (i.e. database subscriptions) without something like Hilt? Custom

androidx.lifecycle.ViewModelProvider.Factory

I assume but the docs are a little thin on this subject.

👀 1

Orhan Tozan

02/13/2021, 10:28 AM

What does this say about the ETA of the beta release? Coming next days?

louiscad

02/13/2021, 5:18 PM

Just made a petition to have Jetpack Compose package name change before beta release, to avoid confusion for multiplatform usage and

androidx

. Please sign if you agree! https://www.change.org/p/google-drop-androidx-from-jetpack-compose-package-name-for-multiplatform-before-1-0-release

👍 15

😂 8

✍️ 9

☝️ 22

Mehdi Haghgoo

02/14/2021, 3:14 PM

Is nesting as bad in Compose as was in classical layouts?

🚫 13

nglauber

02/15/2021, 2:04 PM

Copy code

accompanist_coil_version = '0.5.0'
        accompanist_picasso_version = '0.5.0'
        app_compat_version = '1.3.0-beta01'
        compose_version = '1.0.0-alpha12'
        compose_navigation_version = '1.0.0-alpha07'
        core_ktx_version = '1.3.2'
        gson_version = '2.8.6'
        kotlin_version = "1.4.21-2"
        lifecycle_version = '2.3.0'
        material_version = '1.3.0'
        okhttp_version = '4.9.0'
        room_version = "2.2.6"

manueldidonna

02/16/2021, 11:09 AM

There is no easy way to do that. I filled out a feature request https://issuetracker.google.com/issues/180311607

Ahmet Delibaş

02/16/2021, 12:17 PM

it didn't work for me, is there any answer ?

Lukas K-G

02/16/2021, 2:45 PM

I am currently looking into migrating some parts of an existing app to compose UI and I stumbled upon the following issue: For compatibility reasons, I need to embed a good old xml view. This works well using

Copy code

AndroidView()

, but now I need to place other components above this view that should not exceed the

AndroidView

s bounding boxes. Which means I somehow need a layout component that has exactly the size and position of that

AndroidView

. Any help would be highly appreciated.

zsperske

02/16/2021, 4:06 PM

👋 Does the compose team have a target date for moving to beta? The team has been building so much incredible functionality its generating a lot of excitement at my company but we have to balance the risks of adopting a framework that is still in alpha. I’m certain compose is the future and want us to make the switch as soon as we can.

🔜 2

👀 12

Kyant

02/17/2021, 11:25 AM

Hi, how can I convert

ImageVector.Builder

Outline

path (for Shape)? Their draw functions are similar but I cannot copy and paste them directly, especially

arcToRelative

steelahhh

02/17/2021, 3:16 PM

Found a workaround: when dismissing a Dialog, I clear focus from *TextField and make it

enabled = false

. Doesn't work when dismissing by back button press tho, so I've just disabled it for now 🤷🏼

Kensuke Sano

02/18/2021, 8:13 AM

Is it possible to track changes WebView URL?

Copy code

val intent = Intent(Intent.ACTION_VIEW, Uri.parse("<http://example.com/xxx>"))
ContextCompat.startActivity(context, intent, null) // open WebView

// How to  track  wevViewURL?

if (webViewURL == "/finish") {
  // How to close webview?
}

Lilly

02/18/2021, 7:02 PM

Some changes in alpha-12 haven't been applied to documentation, especially the

saveable

stuff. I have filed a bug: https://issuetracker.google.com/issues/180624912

jim

02/18/2021, 11:03 PM

Hopefully soon-ish, yes. It is very much something we want to enable. We've always said that your composable functions should be pure functional transforms from input data into UI, should be side-effect free, and should make no assumptions about which thread they or their children run on. These rules, while not enforced as strictly as I would have liked, have always existed for a few reasons. Firstly, they make your code more understandable+maintainable and generally just better. And secondly they exist because of the way memoization and skipping already work. But most importantly, they are necessary for your composables to not break when we roll out multithreaded composition. Even internally, we probably have some widgets that we wrote incorrectly which will break if we turn on multithreading, so it'll probably be possible to enable/disable with a flag to start. But it is very much something I'd like to see sooner rather than later. The faster we can get it rolled out, the easier it will be to help migrate the existing users. It is very much a work in progress, and will take some time to finish, test, and roll out - but we'll let you all know as things continue to progress.

jetpack compose 11

❤️ 19

👍 10

💯 15

K 34

natario1

02/19/2021, 5:47 PM

Is there any way to open a dropdown menu on long press and selecting the item when lifting the finger? Like https://stackoverflow.com/q/39816318/4288782 . What's the compose way to implement something like this? I'd appreciate any hints.

Javier

02/20/2021, 6:22 PM

Can Google say something about this?

👀 1

☝️ 1

😂 6

jim

02/20/2021, 7:37 PM

The syntax was originally called

KTX

, back before the Android Kotlin Extensions (also called KTX) started competing for the same name. If you look back at some of the original commits to Compose, you'll see a flag to enable/disable the KTX syntax. There were some very real reasons the syntax existed, which maybe we'll go into in a blog post or something some day. Those early explorations had a major impact both on what Compose is today and what Kotlin can do today.

👍 10

Arkadii Ivanov

02/20/2021, 8:20 PM

Even SwiftUI is missing these methods now, AFAIK. 🙃

Tristan

02/20/2021, 10:47 PM

So I made something working, for which I joined the output when using

Copy code

Rating(4.3F, 5)

Is there anything wrong with what I have done? Will I have performances issue? 😮 Thanks for your help.

Copy code

@Composable
fun Rating(score: Float, maxScore: Int, modifier: Modifier = Modifier, tint: Color = Color.Yellow) {
    val shape = remember(score) {
        val rate = score - score.toInt()
        GenericShape { size ->
            lineTo(size.width * rate, 0f)
            lineTo(size.width * rate, size.height)
            lineTo(0f, size.height)
        }
    }
    val icon = vectorResource(id = R.drawable.ic_star)

    Row(modifier = modifier) {
        for (i in 0 until maxScore) {
            if (i + 1 < score) {
                Icon(
                    imageVector = icon,
                    tint = tint,
                )
            } else if (i < score) {
                Box {
                    Icon(
                        imageVector = icon,
                    )
                    Icon(
                        imageVector = icon,
                        tint = tint,
                        modifier = Modifier.clip(shape),
                    )
                }
            } else {
                Icon(
                    imageVector = icon,
                )
            }
        }
    }
}

⭐ 8

0rph3u

02/22/2021, 12:50 PM

Hello, anyone knows what's the equivalent of using MaskFilter in compose? Like we can traditionally use Paint.setMaskFilter but for compose canvas

jim

02/23/2021, 6:35 PM

I think the conversation is more nuanced. In general, across the application architecture (entire stack) you want to ideally have a single source of truth. That is to say, you should never have two places (variables, databases, tables, etc) where the same information is duplicated/synchronized. Attempting to do so inevitably leads to data consistency issues and makes it much harder to perform updates. So as a general principle, I think single source of truth as defined by Compose does in fact apply across the entire stack. Having said that, there are practicalities where the real world can start to intrude. For example, performing optimistic updates on a local shadow of the single source of truth while you're waiting for a round trip with your database server. Sometimes such things are necessary in the real world, but that doesn't mean it is desirable architecturally. So yes there is some nuance, but I wonder if the slide above may create more confusion among newbies than clarity. Food for thought.

👍 2

Vivek Sharma

02/23/2021, 6:39 PM

how can I listen to long press and release of any clickable item, prev there was

pressIndicatorGesture

; is it something related to

InteractionState

👀 1

Sam

02/23/2021, 8:12 PM

We are facing the same challenges with

LazyColumn

in our chat app, the

LazyListState

api is very limited with

smoothScrollBy

and

snapToItemIndex

and there is not much you can do at this point until the api becomes more robust