jetc.dev Newsletter Issue #147
Once again, I’m back! 👋
This week, we look at Compose for Desktop and Compose for NativeScript. We explore
navigation as state and testing state restoration. We apply marquee effects to
composables and crop some images. And we spend
some time with
decorationBox, despite it having nothing to do with holiday presents.
One Off the Stack, One Off the Slack
You’ve got questions. That’s understandable!
LaunchedEffect() lets you start a coroutine when the composition is entered.
However, you are still subject to the rules of coroutines — if you launch
a coroutine on
Dispatchers.Main, that will block the UI. And so you can get bitten
by the default dispatcher for
viewModelScope, even with
we see in this week’s highlighted Stack Overflow question.
SpannableString, there are ways to add accessibility “links” that can
be read by TalkBack. See how to implement the same thing with an
in this week’s highlighted Kotlinlang
#compose Slack thread.
Posts, videos, and other new information related to Jetpack Compose!
Alex Styl returns, taking a look at Compose for Desktop. Alex has been using Compose for Desktop for Ubidrop, and while it had some strong points, Alex encountered challenges with more advanced scenarios.
Often, we need a text entry field to have stuff around it: icons, borders, captions,
and the like. Raheem Hameed discusses the
decorationBox parameter to
a slot API where you provide the wrapper contents around the field itself, so you can
tailor that wrapper to match your design system’s needs.
Ban Markovic is back, this time looking at the ever-popular OTP or PIN input,
where you want to collect text from the user but render each character in its
own UI element. As it turns out, Ban’s solution also involves
in this case largely ignoring the actual field and rendering the entered text
in a series of boxes.
Navigation as state: Implementing animated navigation transitions for large screens with moveableContentOf in Jetpack Compose
TJ Dahunsi explores the concept of treating navigation as part of app state,
with an eye towards supporting different UIs for different screen sizes. In this
approach, navigation is just another type of app data, managed by an observable
repository. TJ also explores how one can leverage
moveableContentOf() to have
shared element transitions as you move from state to state, including moving
from screen size to screen size (e.g., a resizable Chrome OS window).
Android 13 adds new photo picker APIs that avoid the need for permissions. Those
were then backported by Google to earlier versions of Android, and Google also supplied
PickMultipleVisualMedia contracts for use with the activity
result API. Daniel Atitienei explores using those contracts in a Compose UI app.
rememberSaveable() is a form of
remember() that puts its saved vales into
the saved instance state
Bundle, so the data can be retained across configuration
changes and some process restarts. In this post, Nav Singh explores using
StateRestorationTester for testing composables that leverage
Abhishek Saxena migrated a German<->English dictionary app from classic views to Compose UI and wrote about the experience. Abhishek also walks us through some of the other code cleanup and architecture changes that were made in support of the migration.
Other Interesting Links
- How to model complex screens in Jetpack Compose
- Medium: Clean Android multi-module offline-first scalable app in 2022 (part 2)
- Caching and Pagination with Paging 3 in Android & Jetpack Compose
- Medium: Jetpack Compose state deconstructed
- Medium: How to create a jump to top feature with jetpack compose
- Medium: Jetpack Compose UI — How to use BadgeBox using Jetpack Compose Kotlin
- Medium: How to authenticate to Firebase using email and password in Jetpack Compose?
- Understanding recomposition in Jetpack Compose
- Android Compose DataStore Tutorial
- Medium: JetPack Compose: The Beginning
- Medium: Google Sign-In using Jetpack Compose and MVVM
100% pure code!
Forget marquee effects solely for text! Malik Mukhametzyanov created a
wrapper composable that applies marquee effects for any composable,
- 2023-01-24: Locales! Relay! Effects! Paging! Foldables! Permissions! Date pickers! Bi-directional scrolling! And what your MaterialTheme means... for your SwiftUI code?!?
- 2023-01-17: New Compose patches and alphas! Dealing with Navigation for Compose! Scaffolds! QR codes! Server-defined UI! And @firstname.lastname@example.org has joined the BOM squad! 😁 💥
- 2023-01-10: onNewIntent() and composables! ContactsContract and composables! Balloons! QR codes! Pencils! And a focus on focus!