Jetpack Compose Accompanist — An FAQ. | by Ben Trengrove | Android Builders | Aug, 2022

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Accompanist is a gaggle of libraries that goal to complement Jetpack Compose with options which can be typically required by builders, however should not but formally supported within the Jetpack Compose AndroidX libraries.

Accompanist is a lab-like setting for the brand new Compose APIs. We use it to assist fill identified gaps within the Compose toolkit, experiment with new APIs, and collect suggestions on the expertise of creating a Compose library. Accompanist’s purpose is to not exist. We wish to push the libraries into the official toolkit, at which level they are going to be deprecated and faraway from Accompanist.

At the moment in Accompanist you’ll find libraries for Circulate Layouts, Pager, Navigation Transitions, Swipe Refresh and extra.

We steadily get requested lots of questions on this library, so we thought we might write a submit to reply a few of the most steadily requested questions from chaperones.

One of many principal causes for the existence of Accompanist is the truth that AndroidX doesn’t enable experimental use of the API in numerous modules. There have been options that we knew we might develop that might not be allowed in AndroidX. For instance, navigation transitions require some experimental animation APIs, to allow them to’t be created inside the navigation composition, however may be created in Accompanist.

For standalone options, you may suppose, why not mark the APIs as Experimental in AndroidX? Once we add an experimental API to AndroidX, we’re certain the characteristic will exist in some type, however the API may change type. We additionally attempt to get them out of Experimental as shortly as attainable, we all know this does not at all times occur, however that is the purpose. Once we want them to be extra sturdy in experimental mode or aren’t certain the characteristic is smart, Accompanist is the place they stay.

This desk summarizes the completely different guidelines that apply to the completely different API places. These guidelines are additionally detailed later within the submit.

The purpose of Accompanist is that it will definitely does not exist, that because the AndroidX Compose libraries mature and stabilize, all the performance is loaded.

One other vital a part of why Accompanist exists is the story. Accompanist was initially developed by Chris Banes and the Compose workforce through the early days of Compose. The Compose workforce was creating the Compose samples, and since Compose was nonetheless in a really early stage of improvement, there have been lots of gaps within the characteristic set they wanted. Each from Compose and the shortage of help from different libraries. The workforce wrote lots of code to make the apps work. Accompanist was created as a spot to launch this code for others to make use of. The primary Accompanist library was a Coil wrapper for loading photos asynchronously. Window insert dealing with was added subsequent, adopted by the AppCompat theme adapter after which in 0.7.0 one other 4 libraries have been added. Pagers, pager indicators, system UI controller, and movement layouts. This was additionally when the library was moved from Chris’s private account to an official Google library and the bundle identify was modified from dev.chrisbanes.accompanist a com.google.accompanist respectively. At this level, numerous members of the Compose workforce and group have been working and contributing to the library and it grew from there.

We at present have 12 lively libraries and 1 deprecated library (inserts as up to date) in Accompanist. Our purpose is to take essentially the most used Accompanist capabilities and add them to the principle Compose libraries. This was initially completed efficiently with the primary Accompanist library, Coil, and later with the Insets to Compose Basis. We are going to enhance our upstreaming efforts in future Compose releases, APIs could change throughout upstreaming, however we’re dedicated to offering a straightforward migration path for all Accompanist customers. With the Compose Roadmap replace, you’ll be able to see that the subsequent API to be up to date is Circulate Format.

Compose’s core libraries are constructed on AndroidX, our open supply repository of Android libraries. This group of libraries is named Jetpack. Nonetheless, Accompanist is developed individually from the principle Compose libraries. Once we discuss “upstreaming”, we imply shifting Accompanist improvement into the core Compose libraries as an official characteristic.

Accompanist is developed on GitHub, within the open air. The principle cause for that is simply the story, as said above. What began as a library developed by one writer grew into a set of libraries developed by a number of authors. Nonetheless, there are some vital advantages and the explanation why it stays on GitHub.

AndroidX Experimental APIs

As detailed above, AndroidX doesn’t enable experimental cross-module APIs. Because of this Compose Navigation wouldn’t be capable to use the experimental Compose Animation APIs that make navigation transitions attainable. Backside Sheet Navigator wouldn’t be capable to use experimental materials APIs and so on. Since these are options we all know the group wants, creating them in Accompanist is good. It permits us to supply the characteristic to builders with out having to attend for the subsequent main model of Compose to take away the experimental annotation.

binary compatibility

AndroidX additionally has strict binary compatibility guidelines that make it tough to alter APIs with out rising main model numbers. These guidelines exist for a very good cause, as APIs that change on a regular basis would make creating them a burden. Accompanist tries to not drastically change the API construction between releases, however doesn’t assure it. Once we launch an API in AndroidX, we could change it, however we hope we do not have to. In instances the place we’re uncertain about an API, we mark it as experimental. At Accompanist, now we have the liberty to experiment much more, which is nice once we’re undecided about one thing with out group suggestions.

group contributions

AndroidX has fairly a steep port path earlier than its first contribution, it is also tough to construct and run regionally. GitHub permits for a lot simpler group contributions, which we advocate. As a result of we develop on a system that’s already acquainted to builders, we get much more enter than we’d in any other case, for instance, Navigation Materials was developed by jossi wolf earlier than becoming a member of Google!

Details about the Compose expertise

Growing on GitHub offers us useful insights into the problems dealing with third-party builders. By staying on AndroidX, we frequently miss points that appear apparent to third-party builders. By creating on GitHub, the place most different exterior libraries are developed, we catch points a lot earlier.

We predict it’s! Accompanist is utilized by just below 30% of apps utilizing Compose on the Play Retailer and rising. It’s also utilized by the Play Retailer app itself and several other different Google-owned apps. Accompanist is not any completely different than another library you may import into your utility. We do our greatest to take care of it, repair bugs, and keep on high of points. It’s best to at all times evaluate the supply code your self to see should you’re proud of it earlier than including it to your utility, identical to another library you employ.

Our purpose is to push essentially the most used capabilities into the principle Compose library as quickly as we are able to, and we’ll do this with extra libraries quickly. Nonetheless, we is not going to immediately take away them from Accompanist. Each time a library is up to date, we maintain an outdated model in Accompanist for a minimum of one secure launch of Compose. We will even give you a migration information or @ReplaceWith annotations to facilitate the transition from the Accompanist model to the official model.

And not using a Google proprietor working with you, no, we do not do this anymore. Now that Compose is out and secure, we wish to develop the library ecosystem! We do not need all libraries to finish in Accompanist, that is complicated for builders. We might love so that you can launch your characteristic as a library of your personal. For those who suppose your library is smart on Accompanist, first open a difficulty to debate with us and we might be able to discover an proprietor to work with you.

We positively welcome and encourage bug fixes and enhancements to current libraries. You probably have a big contribution, like every open supply repository, it is at all times greatest to achieve out to us through GitHub points, to verify if we are able to help your inclusion.

One has simply been launched to assist with responsive layouts, however that is the one new library deliberate right now. Along with Accompanist, now we have additionally revealed and are creating Horologist to assist equally with Compose for Put on.

We all know that having a separate library exterior of AndroidX is complicated for builders and creates extra work throughout a migration, so we solely wish to add new libraries to Accompanist the place there’s a clear path for upstreaming and experimentation in Accompanist is clearly wanted.


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Jetpack Compose Accompanist — An FAQ. | by Ben Trengrove | Android Developers | Aug, 2022

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