kotlinlang #compose

Which doesn’t actually work for me in Android Studio 2020.3 Canary 9. Is this functionality that should be working, or is planned but just not quite working yet?

Daniele B

03/16/2021, 7:27 PM

On the Compose icons, I can only find the “filled” Star icon

Icons.Default.Star

but not the “empty” one. Anyone knows if it’s available?

Colton Idle

03/16/2021, 8:23 PM

How would you all go about building this? I guess I can just make a Column with two item types. One item type is for the header, and the other is for each typeface item. Each typeface item would just be a row with weight distributed as 40%, 20%, 20%, 20% I just want to make sure there's no other obvious solution here. There's no "grid" or "table" (like html/css) in compose right?

Colton Idle

03/16/2021, 10:04 PM

This is a great little article on the UX of preview in compose https://medium.com/androiddevelopers/a-ux-journey-of-compose-preview-3c95e1f0a8bf Two things in :thread-please:

👍 2

Jakub Ledwon

03/16/2021, 10:11 PM

Hi there, I'm playing with animations and I encountered a following problem: I have two texts and I'm animting their

fontSize

(pulse effect animation). I want an animation to be infinite, but I want to be able to restart an animation from default value when state changes. So basically I have a switch which determines which text should be animating, and when switch changes the animation should reset. As my animation is infinite I tried

rememberInfiniteTransition

, but there is no way to restart it (or I didn't find any). What would be the best approach for this problem? I would need something like

InfiniteTransition

but I don't want to remember it during state changes.

Deepak Gahlot

03/17/2021, 4:52 AM

I can see we have a textOverflow property in Text(), but there is no such option in TextField. How do we achieve ellipsis in TextField

Slackbot

03/17/2021, 6:46 AM

This message was deleted.

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Kshitij Patil

03/17/2021, 8:01 AM

I might be stating an obvious fact, but noticed one thing today and thought I should share the same. When you’ve many UI components (Button, Text, Progress bar, etc.) cluttered in smaller region and this region is going to get re-composed highly frequent due to some state changes, I simple

Row

Column

based Composable works way better than

ConstraintLayout

. So you might lose some alignment constraint provisions but there won’t be any performance hits.

ConstraintLayout

was accumulating lag over the time while

Row

Column

being simple enough, was able to handle heavy operations.

Rafs

03/17/2021, 8:28 AM

What is the difference between

Modifier.height

and

Modifier.requiredHeight

Danish Ansari

03/17/2021, 9:24 AM

Hello dear developers, I just wanted to ask, now that Compose is in beta, is it safe to use it in already existing production apps? As guided here https://developer.android.com/jetpack/compose/interop

Colton Idle

03/17/2021, 10:45 AM

Is it possible to use the

border()

modifier to just draw on the bottom? Right now it's drawing a rectangle, but I'd love to tell it to just draw on bottom.

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Daniel Candeias

03/17/2021, 10:48 AM

How to define

includeFontPadding

in component

Text()

? Is this supported in compose?

ursus

03/17/2021, 1:43 PM

silly question does compose render after

Activity.onStop

ursus

03/17/2021, 1:55 PM

or is viewmodel expected somehow to halt emissions

escodro

03/17/2021, 2:52 PM

Hello! 👋 I’m trying to implement some Instrumented Tests but I’m facing some issues with

performTextReplacement

because there is a TODO inside the function in Compose 1.0.0-beta02. Is it “expected” for a beta? Should I open an issue tracker? EditingBuffer.kt

internal fun delete(start: Int, end: Int) {
    val deleteRange = TextRange(start, end)
    if (deleteRange.intersects(TextRange(selectionStart, selectionEnd))) {
        // Currently only target for deleteSurroundingText/deleteSurroundingTextInCodePoints.
        TODO("support deletion within selection range.")
    }

Thanks! ❤️

Yang

03/17/2021, 3:01 PM

Is it possible to detect backspace (soft keyboard) key event?

luke_c

03/17/2021, 3:26 PM

Hi all 🙂 Been reading about CompositionLocal and I’m trying to understand when you would use a static CompositionLocal over a dynamic one. Is there any guidance on this anywhere? From my understanding a static CompositionLocal will cause the entire tree below to recompose, which seems worse than always just recomposing the Composable(s) using it

Rolbin

03/17/2021, 4:01 PM

I have just started with compose and was going through the docs. In almost all the code snippets of the composable functions, with function passed as an argument, are not inlined (even for a 2-3 line function) Is there any specific reason for that?

David Attias

03/17/2021, 4:39 PM

I keep getting

.idea/misc.xml

file updated by Android Studio every time I open a Compose Preview. I've read that I should keep this file under version control but it is very annoying. Anyone managed to handle this situation properly ?

Samir Basnet

03/17/2021, 4:43 PM

There is no autofill support for TextFields as of now. Or is there? Can anyone confirm this?

julioromano

03/17/2021, 4:58 PM

Can the bottom sheet in a

BottomSheetScaffold

have an intermediate state like for

BottomSheetBehavior.STATE_HALF_EXPANDED

? Right now I managed to have only 2 states, collapsed (defined by

sheetPeekHeight

) and expanded.

jaqxues

03/17/2021, 5:29 PM

I am having issues with

registerForActivityResult

. I see the result when I override it in Activity, but the callback of the register.... function is not executing. The Intent in question is a GoogleSignInIntent.

Danish Ansari

03/17/2021, 7:47 PM

I'm working on a UI Kit library in Compose So I was wondering how should I develop that it works on Android as well as Desktop. Any heads up?

Noé Casas

03/17/2021, 8:15 PM

I am getting an exception related to

SaveableStateProvider

that says

java.lang.IllegalArgumentException: Type of the key XXXX is not supported. On Android you can only use types which can be stored inside the Bundle.

. What does it mean that a type can be stored inside the Bundle? Here,

XXXX

is a mere sealed class, nothing exotic.

Neal Sanche

03/17/2021, 8:25 PM

I'm trying to replicate a design that has some static background elements, with a bottom navigation bar, and some content pages. Initially a Scaffold within a Scaffold was used for this, where the outer scaffold holds the bottom navigation and a nav host, and the inner scaffolds can have top app bars, and content. To get the static background elements in there, I've put the top level scaffold in a Box, and have the background as a separate composable. This meant the Scaffold's background colour needed to be set to Transparent. But doing so affects the colour of the text painted on it. I thought I'd stop and ask a question instead of going deeper down this rabbit hole. Will put sample code in the thread.

Colton Idle

03/17/2021, 8:43 PM

Possible bug with ripples and animatedVisibility? It's very slight but a ripple looks off when the container it's in open up because the ripple goes from filling in the rectangle, to instead be a circle. You can see that the left and right of the expanding item fills all the way to the corner, but the bottom left and right get a rounded ripple. In a large list of expanding and collapsing items my designer asked me if I could have the ripple continue to fill the entire container and thought it was a valid point. Curious if this is a valid bug worth reporting or working as intended. Code inside thread

possible_rippe_bug.mp4

Vsevolod Ganin

03/17/2021, 10:07 PM

Please advise how can I debug situations when composable doesn’t get recomposed when it should (it seems)? For all I know, I click something inside UI, the callback updates external model (completely outside Compose), then reactive forces get to call

setContent

on Activity and then just nothing - nothing updates on screen, nothing bumps into my breakpoints except top-level composable. Don’t know where to look honestly

➕ 1

Tlaster

03/18/2021, 6:58 AM

Just wonder: using

compositionLocal

seems like not a good idea, what about using built-in

compositionLocal

LocalContentColor

Title

Tlaster

03/18/2021, 6:58 AM

Just wonder: using

compositionLocal

seems like not a good idea, what about using built-in

compositionLocal

LocalContentColor

jim

03/18/2021, 2:00 PM

Use your best judgement, Sometimes using CompositionLocals is necessary, but it is a good idea to avoid composition locals whenever possible. Also avoiding anything that is platform-specific (eg. AAC ViewModel, ConstraintLayout, and Navigation are Android-only so I'd typically avoid them) and anything that is application specific (eg. direct calls into your application backend) should also be avoided. All CompositionLocals break widget API modularization because any widget which uses your widget is now implicitly exposing additional public API that they may not have intended to expose and may have considered to be an implementation detail. They are also more difficult to reason about the data flow when things happen implicitly, which is especially troublesome for refactoring. So avoid when possible, but ultimately you gotta do what you gotta do to build your app.

Tlaster

03/18/2021, 2:53 PM

Thanks! I'm considering removing the use of custom CompositionLocals and platform-specific components (I'm using ViewModel, Navigation and other Jetpack components which blocking the app from cross-platform), I might need to reconsider the app architecture.

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