Making Airbnb’s Android app extra accessible | by Julia Fu | The Airbnb Tech Weblog | Jan, 2023
By: Julia Fu, Peter Elliott
At Airbnb, now we have been consciously designing and constructing merchandise to be equally usable by all customers. Making our cell apps and web sites extra accessible not solely aligns with our firm’s mission of making a world the place folks can belong wherever, but in addition helps the civil rights of individuals with disabilities and complies with the regulation.
On this article, we spotlight a few of the efforts now we have made to make the app extra accessible, for instance, labeling UI parts, grouping associated content material, supporting massive font scale, offering heading and web page names. The Airbnb app is likely one of the hottest journey apps with tens of millions of customers and helps many options. Making such a fancy app extra accessible is a large endeavor that we’re repeatedly engaged on.
At Airbnb, we comply with business finest practices to make the Android app accessible. In case you are , yow will discover all finest practices we comply with from the official Android documentation for platform particular tips and the Web Content Accessibility Guidelines as an business commonplace. Right here we need to spotlight just a few examples the place we apply the perfect practices:
Finest Observe: content material descriptions
Every thing shall have correct content material descriptions until they need to be ignored by assistive know-how. In these examples, the share button has a content material description that TalkBack reads aloud. TalkBack skips the home icon.
Finest follow: grouping
Components of a pure group may be introduced along with focusable containers for higher usability and accuracy. As an illustration, Talkback reads all itemizing content material on the cardboard collectively.
Finest follow: font scale
UI shall be usable when the consumer will increase the system font scale.
Default vs enlarged font scale:
Scaling finest practices
The Airbnb Android app is a big app with many screens. It could be exhausting and never scalable if we wanted so as to add accessibility code in every single place. Happily, our Design Language System allows us to broadly apply these finest practices throughout product surfaces in a extremely environment friendly method. Each display screen is constructed with a group of reusable UI elements. After we enhance the accessibility for one element, the change applies to all of the pages with this element as a part of the view. This has a long-lasting constructive impact on our app’s accessibility enhancements. Right here’s an instance:
Take SectionHeader for instance. This UI element is used to speak the construction on the web page and group content material collectively. We mark this element to be an accessibility heading within the element code so it’s accessible in all screens that comprise this element.
We invested in automated accessibility testing and linting to run with each code commit, which creates a fast suggestions loop for engineers and empowers them to make the app accessible at code writing time. The checks are quick, dependable, and scale effectively with our fast-growing options within the Android app.
Automated testing
We arrange Espresso-based automated testing to examine for accessibility points. Espresso is a well-liked testing library for Android UI with built-in accessibility checks. It helps a complete set of accessibility guidelines and is straightforward to arrange:
If accessibility checks fail, the take a look at outputs an error stack hint that engineers can use to debug the problem. For instance:
On this instance, engineers can present a content material description to the picture view to fulfill accessibility necessities.
We additionally screenshot take a look at our elements with a bigger font dimension to make sure the conduct is right utilizing Happo.
Linting
Along with automated testing, we additionally enabled linting, together with Android Lint guidelines for accessibility and customized lint guidelines constructed with Ktlint.
Right here is an instance of an Android accessibility lint rule:
Apart from the built-in Android Lint, we additionally use Ktlint to construct customized lint guidelines. As an illustration, when a consumer navigates to a brand new display screen, we offer a web page identify for a display screen reader to announce. We use the next rule to make it possible for the web page identify is localized.
Lint guidelines are simple to arrange and supply well timed suggestions, however linting has limitations — it might solely carry out static code evaluation.
At present, these automated checks run as a part of CI (Steady Integration) checks for each code commit. If a pull request doesn’t move the checks, it will likely be blocked from being merged into the first code department. We nonetheless use handbook testing to cowl the areas that automated checks don’t cowl, such because the traversal order of UI parts on a web page. Automated and handbook checks complement one another effectively.
Over the previous yr, now we have been integrating Jetpack Compose into our app. Google’s Accessibility in Compose documentation has been an excellent useful resource to make sure our Compose elements and screens stay accessible. Whereas there are some notable issues lacking that existed with Views (e.g. focus order modification), Compose continues to be a younger library and we stay up for future enhancements. Listed here are a few issues price mentioning about our Compose-specific accessibility tooling:
Proactively encourage content material descriptions within the API
Certainly one of our tips for UI elements is that content material descriptions uncovered by way of a perform parameter shouldn’t use a default worth. This brings accessibility to the highest of thoughts when an engineer makes use of the element as they should contemplate what worth to move. A null worth continues to be acceptable in circumstances the place that UI ingredient shouldn’t be vital for accessibility.
Web page identify bulletins
When utilizing Fragments and Views, we use the View.setAccessibilityPaneTitle() and View.announceForAccessibility() APIs when navigating to a brand new display screen to announce a descriptive web page identify to the consumer. These APIs don’t exist in Compose however we wished to maintain the performance because it helps to supply extra context as to what the brand new display screen shows. Our present workaround units sure semantics on the display screen’s outer composable:
We use the liveRegion property so adjustments may be introduced when the content material description adjustments. That is helpful for pages whose whole content material is decided by a response from the server. On this case, TalkBack would announce “Content material Loading” whereas the community request is pending, adopted by “Content material Loaded” when it completes, and at last the web page description outlined within the server response. One draw back of this strategy is that it requires the outer container to be focusable, which requires a further navigation motion to get to the content material.
Making our Android app extra accessible has been an impactful journey. Bettering app accessibility includes following finest practices, including rigorous enforcements, regularly studying from errors, and placing within the work. All of those are worthy efforts to verify an app works for all customers.
In case you are enthusiastic about constructing extremely accessible merchandise and the framework to assist them, try a few of our associated open positions:
Staff Android Software Engineer, Guest
Senior iOS Software Engineer, Infrastructure
It’s a enormous endeavor to make a fancy app just like the Airbnb Android app extra accessible. This work wouldn’t be attainable with out the big efforts from the digital accessibility crew and the close-knit Android neighborhood at Airbnb. Each engineer has contributed to creating the options they personal accessible. Making the Android app extra accessible is an ongoing effort and it couldn’t succeed with out all of them.
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