What’s new in Jetpack Compose


Posted by Jolanda Verhoef, Android Developer Relations Engineer

It has been nearly two years since we launched the primary secure model of Jetpack Compose, and since then, we’ve seen its adoption and have set develop spectacularly. Whether or not you write an utility for smartphones, foldables, tablets, ChromeOS units, smartwatches, or TVs, Compose has received you coated! We suggest you to make use of Compose for all new Put on OS, telephone and large-screen apps. With new tooling and library options, prolonged Materials Design 3, giant display screen, and Put on OS help, and alpha variations of Compose for homescreen widgets and TV… That is an thrilling time!

Compose locally

Within the final 12 months, we’ve seen many corporations investigating and choosing Compose to build new features and migrate screens of their manufacturing purposes. 24% of the highest 1000 apps on Google Play have already chosen to undertake Compose! For instance, Dropbox engineers instructed us that they rewrote their search expertise in Compose in just some weeks, which was 40% much less time than anticipated, and fewer than half the time it took the workforce to construct the function on iOS. In addition they shared that they have been interested by adopting Compose “due to its first-class help for design methods and tooling help”. Our Google Drive workforce reduce their growth time almost in half when utilizing Compose mixed with structure enhancements.

It’s nice to see how these groups expertise quicker growth cycles, and likewise really feel their UI code is extra testable. Impressed? Begin by studying our information How to Adopt Compose for your Team, which outlines how and the place to start out, and reveals the areas of growth the place Compose can convey large added worth.

Library options & growth

Since we launched the primary Compose Bill of Materials in October final 12 months, we’ve been engaged on new options, bug fixes, efficiency enhancements, and bringing Compose to all over the place you construct UI: telephones, tablets, foldables, watches, TV, and your property display screen. Yow will discover all adjustments within the May 2023 release and the latest alpha versions of the Compose libraries.

We’ve heard from you that efficiency is one thing you care about, and that it’s not at all times clear methods to create performant Compose purposes. We’re repeatedly bettering the efficiency of Compose. For instance, as of final October, we began migrating modifiers to a brand new and extra environment friendly system, and we’re beginning to see the outcomes of that migration. For textual content alone, this work resulted in a mean 22% efficiency acquire that may be seen within the latest alpha release, and these enhancements apply throughout the board. To get these advantages in your app, all it’s important to do is replace your Compose model!

Textual content and TextField received many upgrades previously months. Subsequent to the efficiency enhancements we already talked about, Compose now helps the most recent emoji model 🫶 and contains new textual content options comparable to outlining textual content, hyphenation help, and configuring line breaking conduct. Learn extra within the launch notes of the compose-foundation and compose-ui libraries.

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The brand new pager component permits you to horizontally or vertically flip by way of content material, which is analogous to ViewPager2 in Views. It permits deep customization choices, making it potential to create visually gorgeous results:

Moving image showing Hoizontal Pager composable
Select a track utilizing the HorizontalPager composable. Discover ways to implement this and different fancy results in Rebecca Franks’ blog post.

The brand new move layouts FlowRow and FlowColumn make it simple to rearrange content material in a vertical or horizontal move, very like strains of textual content in a paragraph. In addition they allow dynamic sizing utilizing weights to distribute the objects throughout the container.

Image of search filters in a real estate app created with flow layouts
Utilizing move layouts to indicate the search filters in an actual property app

To be taught extra in regards to the new options, efficiency enhancements, and bug fixes, see the release notes of the most recent secure and latest alpha launch of the Compose libraries.

Instruments

Growing your app utilizing Jetpack Compose is way simpler with the brand new and improved instruments round it. We added tons of latest options to Android Studio to enhance your workflow and effectivity. Listed here are some highlights:

Android Studio Flamingo is the most recent secure launch, bringing you:

  • Challenge templates that use Compose and Materials 3 by default, reflecting our really helpful practices.
  • Materials You dynamic colours in Compose previews to shortly see how your composable responds to in a different way coloured wallpapers on a consumer gadget.
  • Compose features in system traces whenever you use the System Hint profiler that will help you perceive which Compose features are being recomposed.

Android Studio Giraffe is the most recent beta launch, containing options comparable to:

  • Live Edit, permitting you to shortly iterate in your code on emulator or bodily gadget with out rebuilding or redeploying your app.
  • Support for new animations APIs in Animation preview so you possibly can debug any animations utilizing animate*AsStateCrossFaderememberInfiniteTransition, and AnimatedContent.
  • Compose Preview now helps dwell updates throughout a number of information, for instance, if you happen to make a change in your Theme.kt file, you possibly can see all Previews updates routinely in your UI information.
  • Bettering auto-complete conduct. For instance, we now present icon previews whenever you’re including Materials icons, and we maintain the @Composable annotation when working “Implement Members”.

Android Studio Hedgehog incorporates canary options comparable to:

  • Displaying Compose state data within the debugger. Whereas debugging your app, the debugger will inform you precisely which parameters have “Modified” or have remained “Unchanged”, so you possibly can extra effectively examine the reason for the recomposition.
  • You’ll be able to check out the brand new Studio Bot, an experimental AI powered conversational expertise in Android Studio that will help you generate code, repair points, and find out about greatest practices, together with all issues Compose. That is an early experiment, however we might love so that you can give it a strive!
  • Emulator help for the newly introduced Pixel Fold and Pill Digital Units, so to take a look at your Compose app earlier than these units launch later this 12 months.
  • A brand new Espresso Machine API that allows you to apply rotation adjustments, folds, and different synchronous configuration adjustments to your digital units beneath take a look at.

We’re additionally actively engaged on visual linting and accessibility checks for previews so you possibly can routinely audit your Compose UI and test for points throughout totally different display screen sizes, and on multipreview templates that will help you shortly add widespread units of previews.

See Also:  get your app giant display screen prepared

Materials 3

Materials 3 is the really helpful design system for Android apps, and the most recent 1.1 stable release provides lots of nice new options. We added new elements like backside sheets, date and time pickers, search bars, tooltips, and others. We additionally graduated most of the core elements to secure, added extra movement and interplay help, and included edge-to-edge help in lots of elements. Watch this video to discover ways to implement Materials You in your app:

Extending Compose to extra surfaces

We wish Compose to be the programming mannequin for UI wherever you run Android. This implies together with first-class help for big screens comparable to foldables and tablets and publishing libraries that make it potential to make use of Compose to jot down your homescreen widgets, smartwatch apps, and TV purposes.

Massive display screen help

We’ve continued our efforts to make growth for big screens simple whenever you use Compose. The pager and move layouts that we launched are widespread patterns on giant display screen units. As well as, we added a new Compose library that allows you to observe the gadget’s window size class so you possibly can simply construct adaptive UI.

When attaching a mouse to an Android gadget, Compose now appropriately adjustments the mouse cursor to a caret whenever you hover the cursor over textual content fields or selectable textual content. This helps the consumer to grasp what parts on display screen they’ll work together with.

Moving image of Compose adjusting the mouse cursor to a caret when the mouse is hovering over text field

Look

As we speak we publish the primary beta model of the Jetpack Glance library! Look allows you to develop widgets optimized for Android telephone, pill, and foldable homescreens utilizing Jetpack Compose. The library provides you the most recent Android widget enhancements out of the field, utilizing Kotlin and Compose:

  • Look simplifies the implementation of interactive widgets, so you possibly can showcase your app’s prime options, proper on a consumer’s house display screen.
  • Look makes it simple to construct responsive widgets that look nice throughout kind elements.
  • Look permits quicker UI Iteration together with your designers, making certain a top quality consumer expertise.
Image of search filters in a real estate app created with flow layouts

Put on OS

We launched Compose for Put on OS 1.1 secure final December, and we’re working laborious on the brand new 1.2 launch which is currently in alpha. Right here’s a number of the highlights of the continual enhancements and new options that we’re bringing to your wrist:

  • The placeholder and placeholderShimmer add elegant loading animations that can be utilized on chips and playing cards whereas content material is loading.
  • expandableItems make it potential to fold lengthy lists or lengthy textual content, and solely broaden to indicate their full size upon consumer interplay.
  • Rotary enter enhancements accessible in Horologist add intuitive snap and fling behaviors when a consumer is navigating lists with rotary enter.
  • Android Studio now allows you to preview a number of watch display screen and textual content sizes whereas constructing a Compose app. Use the Annotations that we have now added here.

Compose for TV

Now you can construct pixel excellent front room experiences with the alpha launch of Compose for TV! With the brand new AndroidX TV library, you possibly can apply the entire advantages of Compose to the distinctive necessities for Android TV. We labored carefully with the group to construct an intuitive API with highly effective capabilities. Engineers from Soundcloud shared with us that “because of Compose for TV, we’re in a position to reuse elements and transfer a lot quicker than the outdated Leanback View APIs would have ever allowed us to.” And Plex shared that “TV focus and scrolling help on Compose has vastly improved our developer productiveness and app efficiency.”

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Compose for TV comes with a wide range of elements comparable to ImmersiveList and Carousel which might be particularly optimized for the lounge expertise. With just some strains of code, you possibly can create nice TV UIs.

Moving image of TVLazyGrid on a screen

TvLazyColumn {
 
objects(contentList) { content material ->
    TvLazyRow {
objects(content material) { cardItem ->
Card(cardItem)
}
  }
}

Be taught extra in regards to the launch on this weblog publish, take a look at the “What’s new with TV and intro to Compose” discuss, or see the TV documentation!

Compose help in different libraries

It’s nice to see increasingly more internally and externally developed libraries add help for Compose. For instance, loading footage asynchronously can now be performed with the GlideImage composable from the Glide library. And Google Maps released a library which makes it a lot simpler to declaratively create your map implementations.

GoogleMap(

) {
Marker(
state = MarkerState(place = LatLng(-34, 151)),
title = "Marker in Sydney"
)
Marker(
state = MarkerState(place = LatLng(35.66, 139.6)),
title = "Marker in Tokyo"
)
}

New and up to date steerage

Irrespective of the place you’re in your studying journey, we’ve received you coated! We added and revamped lots of the steerage on Compose:

Comfortable Composing!

We hope you are as excited by these developments as we’re! If you have not began but, it is time to be taught Jetpack Compose and see how your workforce and growth course of can profit from it. Prepare for improved velocity and productiveness. Comfortable Composing!

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