fidzu : pda

Karrot is a hyperlocal, community-driven peer-to-peer marketplace app that enables users to buy, sell, and trade items with other verified users. Since launching in South Korea in 2015, the platform has expanded into global markets, amassing over 43 million registered users.

After launching in North America, engineers at Karrot observed that 30% of users in the region use a non-English device language, such as Spanish. To make the app more accessible, the team wanted to bring seamless translation functionality to Karrot quickly and at scale. The developers determined that the most efficient way to implement quality translations would be through integrating an AI service directly into the app, so they selected the Firebase AI Logic and its Android SDK to access Gemini Flash Lite, which led to higher purchasing conversion among non-English users.

Integrating Gemini Firebase AI Logic

The team initially tested two on-device options: the ML Kit Translation SDK and Gemini Nano. But the team found challenges with each: ML Kit Translation didn't meet the team's quality expectations, and Gemini Nano, if it isn't already on the device, required the user to download the model data.

The team then tested Firebase AI Logic. By calling the Gemini API directly from the app, Firebase AI Logic delivered accuracy at speeds that mirrored a natural conversational cadence.

Integrating Firebase AI Logic into the app was a "remarkably straightforward experience," according to TaeGyu An, an Android Software Engineer on Karrot's Mobile Platform team. TaeGyu and the team used the platform's documentation and code samples to build a proof of concept in under three hours.

This allowed the team to spend more time refining prompts and finding optimal configuration values. "Even without extensive experience writing prompts, the official documentation's guides and tips made it easy to quickly identify the right direction for improving translation quality," said WonJoong Lee, an Android Software Engineer on Karrot's North America Product Team.

This low barrier to entry and rapid turnaround time enabled engineers to keep development costs low and go from proof of concept to production code in just two weeks-all without setting up a dedicated backend. That also freed up time to focus on UX and policy design, such as opt-in behavior and the conditions for the translation banner.

Driving sales with enhanced AI features

Since implementing translation using Gemini and Firebase AI Logic, the Karrot team observed higher purchasing conversion among non-English users, indicating that the translation feature is helping drive sales.

Of users who used a non-English device language, one in three of them who were shown the translation banner actively used the feature. The team has also observed that buyers offered translation functionality were 2.4X more likely to start a chat with a seller than those who weren't.

The flexibility and simplicity of deploying Firebase AI Logic has led the team to explore other features to simplify the workstreams of its engineers. "It's rewarding to build features that scale across diverse Android devices while helping neighbors connect and interact within their local communities," concluded TaeGyu.

Going forward, the team plans to implement Server Prompt Templates to adjust prompts after release without shipping a new version of the app. This, combined with Remote Config, should help the team iterate faster and reduce operational overhead.

Get started

Learn how to build Gemini-enabled features like AI translations and in-app personalization and more with Firebase AI Logic to deliver better experiences to your users, faster.

04 May 2026 5:00pm GMT

Today, the Jetpack Compose April '26 release is stable. This release contains version 1.11 of core Compose modules (see the full BOM mapping), shared element debug tools, trackpad events, and more. We also have a few experimental APIs that we'd love you to try out and give us feedback on.

To use today's release, upgrade your Compose BOM version to:

implementation(platform("androidx.compose:compose-bom:2026.04.01"))

Changes in Compose 1.11.0

Coroutine execution in tests

We're introducing a major update to how Compose handles test timing. Following the opt-in period announced in Compose 1.10, the v2 testing APIs are now the default, and the v1 APIs have been deprecated. The key change is a shift in the default test dispatcher. While the v1 APIs relied on UnconfinedTestDispatcher, which executed coroutines immediately, the v2 APIs use the StandardTestDispatcher. This means that when a coroutine is launched in your tests, it is now queued and does not execute until the virtual clock is advanced.

This better mimics production conditions, effectively flushing out race conditions and making your test suite significantly more robust and less flaky.

To ensure your tests align with standard coroutine behavior and to avoid future compatibility issues, we strongly recommend migrating your test suite. Check out our comprehensive migration guide for API mappings and common fixes.

Shared element improvements and animation tooling

We've also added some handy visual debugging tools for shared elements and Modifier.animatedBounds. You can now see exactly what's happening under the hood-like target bounds, animation trajectories, and how many matches are found-making it much easier to spot why a transition might not be behaving as expected. To use the new tooling, simply surround your SharedTransitionLayout with the LookaheadAnimationVisualDebugging composable.

LookaheadAnimationVisualDebugging(
    overlayColor = Color(0x4AE91E63),
    isEnabled = true,
    multipleMatchesColor = Color.Green,
    isShowKeylabelEnabled = false,
    unmatchedElementColor = Color.Red,
) {
    SharedTransitionLayout {
        CompositionLocalProvider(
            LocalSharedTransitionScope provides this,
        ) {
            // your content
        }
    }
}

Trackpad events

We've revamped Compose support for trackpads, like built-in laptop trackpads, attachable trackpads for tablets, or external/virtual trackpads. Basic trackpad events will now generally be considered PointerType.Mouse events, aligning mouse and trackpad behavior to better match user expectations. Previously, these trackpad events were interpreted as fake touchscreen fingers of PointerType.Touch, which led to confusing user experiences. For example, clicking and dragging with a trackpad would scroll instead of selecting. By changing the pointer type these events have in the latest release of Compose, clicking and dragging with a trackpad will no longer scroll.

We also added support for more complicated trackpad gestures as recognized by the platform since API 34, including two finger swipes and pinches. These gestures are automatically recognized by components like Modifier.scrollable and Modifier.transformable to have better behavior with trackpads.

These changes improve behavior for trackpads across built-in components, with redundant touch slop removed, a more intuitive drag-and-drop starting gesture, double-click and triple-click selection in text fields, and desktop-styled context menus in text fields.

To test trackpad behavior, there are new testing APIs with performTrackpadInput, which allow validating the behavior of your apps when being used with a trackpad. If you have custom gesture detectors, validate behavior across input types, including touchscreens, mice, trackpads, and styluses, and ensure support for mouse scroll wheels and trackpad gestures.

Before	After

Composition host defaults (Compose runtime)

We introduced HostDefaultProvider, LocalHostDefaultProvider, HostDefaultKey, and ViewTreeHostDefaultKey to supply host-level services directly through compose-runtime. This removes the need for libraries to depend on compose-ui for lookups, better supporting Kotlin Multiplatform. To link these values to the composition tree, library authors can use compositionLocalWithHostDefaultOf to create a CompositionLocal that resolves defaults from the host.

Preview wrappers

Android Studio custom previews is a new feature that allows you to define exactly how the contents of a Compose preview are displayed.

By implementing the PreviewWrapperProvider interface and applying the new @PreviewWrapper annotation, you can easily inject custom logic, such as applying a specific Theme. The annotation can be applied to a function annotated with @Composable and @Preview or @MultiPreview, offering a generic, easy-to-use solution that works across preview features and significantly reduces repetitive code.

class ThemeWrapper: PreviewWrapper {


    @Composable


    override fun Wrap(content: @Composable (() -> Unit)) {


        JetsnackTheme {


            content()


        }


    }


}



@PreviewWrapperProvider(ThemeWrapper::class)


@Preview


@Composable


private fun ButtonPreview() {


    // JetsnackTheme in effect


    Button(onClick = {}) {


        Text(text = "Demo")


    }


}

Deprecations and removals

• As announced in the Compose 1.10 blog post, we're deprecating Modifier.onFirstVisible(). Its name often led to misconceptions, particularly within lazy layouts, where it would trigger multiple times during scrolling. We recommend migrating to Modifier.onVisibilityChanged(), which allows for more precise manual tracking of visibility states tailored to your specific use case requirements.
• The ComposeFoundationFlags.isTextFieldDpadNavigationEnabled flag was removed because D-pad navigation for TextFields is now always enabled by default. The new behavior ensures that the D-pad events from a gamepad or a TV remote first move the cursor in the given direction. The focus can move to another element only when the cursor reaches the end of the text.

Upcoming APIs

In the upcoming Compose 1.12.0 release, the compileSdk will be upgraded to compileSdk 37, with AGP 9 and all apps and libraries that depend on Compose inheriting this requirement. We recommend keeping up to date with the latest released versions, as Compose aims to promptly adopt new compileSdks to provide access to the latest Android features. Be sure to check out the documentation here for more information on which version of AGP is supported for different API levels.

In Compose 1.11.0, the following APIs are introduced as @Experimental, and we look forward to hearing your feedback as you explore them in your apps. Note that @Experimental APIs are provided for early evaluation and feedback and may undergo significant changes or removal in future releases.

Styles (Experimental)

We are introducing a new experimental foundation API for styling. The Style API is a new paradigm for customizing visual elements of components, which has traditionally been performed with modifiers. It is designed to unlock deeper, easier customization by exposing a standard set of styleable properties with simple state-based styling and animated transitions. With this new API, we're already seeing promising performance benefits. We plan to adopt Styles in Material components once the Style API stabilizes.

A basic example of overriding a pressed state style background:

@Composable
fun LoginButton(modifier: Modifier = Modifier) {
    Button(
        onClick = {
            // Login logic
        },
        modifier = modifier,
        style = {
            background(
                Brush.linearGradient(
                    listOf(lightPurple, lightBlue)
                )
            )
            width(75.dp)
            height(50.dp)
            textAlign(TextAlign.Center)
            externalPadding(16.dp)

            pressed {
                background(
                    Brush.linearGradient(
                        listOf(Color.Magenta, Color.Red)
                    )
                )
            }
        }
    ){
        Text(
            text = "Login",
        )
    }
}

Check out the documentation and file any bugs here.

MediaQuery (Experimental)

The new mediaQuery API provides a declarative and performant way to adapt your UI to its environment. It abstracts complex information retrieval into simple conditions within a UiMediaScope, ensuring recomposition only happens when needed.

With support for a wide range of environmental signals-from device capabilities like keyboard types and pointer precision, to contextual states like window size and posture-you can build deeply responsive experiences. Performance is baked in with derivedMediaQuery to handle high-frequency updates, while the ability to override scopes makes testing and previews seamless across hardware configurations.

Previously, to get access to certain device properties - like if a device was in tabletop mode - you'd need to write a lot of boilerplate to do so:

@Composable
fun isTabletopPosture(
    context: Context = LocalContext.current
): Boolean {
    val windowLayoutInfo by
        WindowInfoTracker
            .getOrCreate(context)
            .windowLayoutInfo(context)
            .collectAsStateWithLifecycle(null)

    return windowLayoutInfo.displayFeatures.any { displayFeature ->
        displayFeature is FoldingFeature &&
            displayFeature.state == FoldingFeature.State.HALF_OPENED &&
            displayFeature.orientation == FoldingFeature.Orientation.HORIZONTAL
    }
}

@Composable
fun VideoPlayer() {
    if(isTabletopPosture()) {
        TabletopLayout()
    } else {
        FlatLayout()
    }
}

Now, with UIMediaQuery, you can add the mediaQuery syntax to query device properties, such as if a device is in tabletop mode:

@OptIn(ExperimentalMediaQueryApi::class)
@Composable
fun VideoPlayer() {
    if (mediaQuery { windowPosture == UiMediaScope.Posture.Tabletop }) {
        TabletopLayout()
    } else {
        FlatLayout()
    }
}

Check out the documentation and file any bugs here.

Grid (Experimental)

Grid is a powerful new API for building complex, two-dimensional layouts in Jetpack Compose. While Row and Column are great for linear designs, Grid gives you the structural control needed for screen-level architecture and intricate components without the overhead of a scrollable list.

Grid allows you to define your layout using tracks, gaps, and cells, offering familiar sizing options like Dp, percentages, intrinsic content sizes, and flexible "Fr" units.

@OptIn(ExperimentalGridApi::class)


@Composable


fun GridExample() {


    Grid(


        config = {


            repeat(4) { column(0.25f) }


            repeat(2) { row(0.5f) }


            gap(16.dp)


        }


    ) {


        Card1(modifier = Modifier.gridItem(rowSpan = 2)


        Card2(modifier = Modifier.gridItem(colmnSpan = 3)


        Card3(modifier = Modifier.gridItem(columnSpan = 2)


        Card4()


    }


}

You can place items automatically or explicitly span them across multiple rows and columns for precision. Best of all, it's highly adaptive-you can dynamically reconfigure your grid tracks and spans to respond to device states like tabletop mode or orientation changes, ensuring your UI looks great across form factors.

Check out the documentation and file any bugs here.

FlexBox (Experimental)

FlexBox is a layout container designed for high performance, adaptive UIs. It manages item sizing and space distribution based on available container dimensions. It handles complex tasks like wrapping (wrap) and multi-axis alignment of items (justifyContent, alignItems, alignContent). It allows items to grow (grow) or shrink (shrink) to fill the container.

@OptIn(ExperimentalFlexBoxApi::class)
fun FlexBoxWrapping(){
    FlexBox(
        config = {
            wrap(FlexWrap.Wrap)
            gap(8.dp)
        }
    ) {
        RedRoundedBox()
        BlueRoundedBox()
        GreenRoundedBox(modifier = Modifier.width(350.dp).flex { grow(1.0f) })
        OrangeRoundedBox(modifier = Modifier.width(200.dp).flex { grow(0.7f) })
        PinkRoundedBox(modifier = Modifier.width(200.dp).flex { grow(0.3f) })
    }
}

Check out the documentation and file any bugs here.

New SlotTable implementation (Experimental)

We've introduced a new implementation of the SlotTable, which is disabled by default in this release. SlotTable is the internal data structure that the Compose runtime uses to track the state of your composition hierarchy, track invalidations/recompositions, store remembered values, and track all metadata of the composition at runtime. This new implementation is designed to improve performance, primarily around random edits.

To try the new SlotTable, enable ComposeRuntimeFlags.isLinkBufferComposerEnabled.

Start coding today!

With so many exciting new APIs in Jetpack Compose, and many more coming up, it's never been a better time to migrate to Jetpack Compose. As always, we value your feedback and feature requests (especially on @Experimental features that are still baking) - please file them here. Happy composing!

22 Apr 2026 11:00pm GMT

In the modern digital landscape, the first encounter a user has with an app is often the most critical. Yet, for decades, this initial interaction has been hindered by the friction of traditional verification methods. Today, we're excited to announce a new verified email credential issued by Google, which developers can now retrieve directly from Android's Credential Manager Digital Credential API.

The Problem: Authentication Friction in the Modern Era

The "current era" of authentication is defined by a trade-off between security and convenience. To ensure that a user owns the email address they provide, you typically rely on One-Time Passwords (OTPs) or "magic links" sent by email or SMS.

While effective, these traditional steps introduce significant hurdles:

• Context switching: Users must leave the app, open their inbox or messaging app, find the code, and return, a process where many potential users simply drop off.
• Delivery issues: While Emails are free, they can be delayed or diverted to spam folders.
• Onboarding friction: Every extra second spent in the "verification loop" is a second where a user might lose interest, directly impacting conversion rates.

The Solution: Seamless, Verified Email

Google now issues a cryptographically verified email credential directly to Android devices. This verified email credential is delivered through the Credential Manager API, which is Android's implementation of the W3C's Digital Credential API standard.

For users, this completely removes the need to manually verify their email through external channels. For developers, the API securely delivers these verified user claims for any scenario whether you are building an account creation flow, a recovery process, or a high-risk step-up authentication.

While this specific verified email address is sourced securely from the user's Google Account on their device, the underlying Digital Credentials API is issuer-agnostic. This fosters an open ecosystem, allowing any holder of a digital credential with an email claim to offer that verification to your app.

User Experience

The beauty of this API lies in its simplicity for the end user. Instead of hunting for OTP codes, the experience is integrated directly into the Android OS:

• Initiation: The process begins when a user focuses on an email input field or taps a "Sign up" or "Recover account" button. You can also initiate the process on page load.
• Transparency: A native Android bottom sheet appears, clearly detailing exactly what data is being requested (for example, user's verified email address).
• One-tap consent: The user simply taps "Agree and continue" to share the data.
• Immediate progress: Once consent is given, the app receives the data instantly. For sign-up or account recovery flows, you can then seamlessly transition the user into passkey creation, ensuring:
  • Users do not have to enter any user information manually, as compared to the traditional username/password registration.
  • Their next login is even faster and more secure.

Use case 1. Sign up

Accelerate onboarding by fetching a verified email the moment the user taps "Sign up". We strongly recommend you pair the verified email retrieval with passkey creation, also part of the Credential Manager API:

Note: You can also fetch other unverified fields such as a user's given name, family name, name, profile picture and the hosted domain connected with the verified email.

Use case 2. Account recovery

Eliminate the frustration of users hunting for recovery codes in their spam folders by allowing them to recover their account using the verified email securely stored on their device.

Use case 3. Re-authentication for sensitive actions

Protect sensitive user actions, such as changing settings or updating profile details, by requiring a quick re-authentication step. Instead of an OTP, you can provide a low-friction verification using the device's verified email.

Important Considerations

As you design your authentication architecture around the Digital Credentials API, keep the following details in mind:

• Account support: For the specific email credential issued by Google, only regular consumer Google Accounts are supported (Workspace and supervised accounts are currently not supported). Keep in mind that the Credential Manager API itself is issuer-agnostic, meaning other identity providers can issue credentials with their own account support policies.
• Other user data: Beyond email, you can request the user's given name, family name, full name, and profile picture. However, note that only the email is verified by Google.
• Auto verify your @gmail accounts: The API provides verified emails for all consumer Google Accounts. We recommend auto-verifying @gmail.com users and routing custom domains to your existing verification flow - for example, an OTP flow. This ensures you maintain long-term access for external domains not directly managed by Google.
• Complementary to Sign in with Google: While both the new verified email credential & Sign in with Google API provides a verified email, the choice depends on the intended user experience:
  • Use Sign in with Google when your users want to create a federated login session.
  • Use Verified Email when your users want to sign in traditionally with a username/password or passkey but want to auto-verify the email address without the manual chore of an OTP.

Conclusion and Next steps

By integrating the new verified email via Credential Manager API, you can drastically reduce onboarding friction and provide users with a more streamlined, secure authentication journey. This represents a shift toward a future where "verification" is no longer a manual chore for the user, but a seamless, integrated part of the native mobile experience.

Ready to see how this fits into your own app? To get started, update your project to the latest Credential Manager API and explore our Integration Guide. We encourage you to explore how this streamlined verification can simplify your critical user journeys from optimizing account creation, to enhancing re-authentication flows.

22 Apr 2026 8:00pm GMT