June 29, 2026 | Android Ecosystem Analyst
The Big Picture: The Great Toolkit Consolidation
Imagine a massive library that has two separate sections for history books: one written in old English and one in modern English. For years, the librarians had to maintain both sections, buying two copies of every new book and fixing the binding on the old ones. It was expensive and confusing. Finally, the head librarian announced, "We are moving all new books to the modern English section. The old section will still be there, and you can still read those books, but we won't be buying any new ones for it." This is exactly what Google has done with Android UI at I/O 2026.
The headline platform decision from the Android team is stated plainly: all Android UI should be built with Jetpack Compose. The legacy View toolkit (XML) is moving into "maintenance mode." This is not a deprecation; there is no removal timeline, and existing apps will not break. But it is a clear signal of where Google is investing its resources. For the millions of Android developers worldwide, this marks the end of an era and the beginning of a unified, Compose-first future.
What "Maintenance Mode" Really Means
It is crucial to understand what "maintenance mode" means in this context, as panic is unnecessary. The android.widget View system and libraries like Fragments and RecyclerView will continue to receive critical bug fixes and security patches. They are not going away. However, they will not receive any new feature development.
This means that new UI tooling in Android Studio is built for Compose only. The existing View-based tools, like the Layout Editor, will not gain new capabilities. Documentation, codelabs, and samples now lead with Compose. The practical guidance from Google is incremental: build new features in Compose, and migrate existing screens only when you are already modifying them. This approach allows teams to transition at their own pace, using the new "XML to Compose migration skill" to convert layouts gradually.
The Performance Proof: TikTok and Grab
Google did not just make this decision based on developer preference; they backed it up with hard production data. At I/O 2026, sessions revealed that TikTok saw 20% to 30% performance improvements by rewriting screens in Compose, with one case reaching a massive 78% improvement. Similarly, Grab enabled the new R8 optimizer on a 9-million-line codebase, reporting a 25% NRA reduction and a 27% reduction in startup time.
These numbers are staggering. They prove that Compose is not just "easier to write"; it is fundamentally more efficient. The declarative nature of Compose allows the framework to optimize rendering in ways that the imperative View system never could. For apps that rely on smooth scrolling, complex animations, and fast startup times, the migration to Compose is a performance imperative.
Android Performance Analyzer: A New Era of Profiling
Alongside the UI shift, Google introduced the Android Performance Analyzer (APA), the successor to the aging Android GPU Inspector. APA is a system-wide profiling tool that analyzes CPU, GPU, memory, and power across the entire device.
The speed improvement is the headline: rendering a trace in APA is 6x to 26x faster than in the old tool. It is also far more stable on large traces, which was a major pain point for developers working on complex apps. APA features system-wide profiling, GPU performance counters from major hardware vendors, and embedded screenshots throughout the trace for visual navigation. It builds on Perfetto for system tracing and is available as a desktop app and integrated into Android Studio. This tool gives developers the visibility they need to optimize their Compose UIs and squeeze every frame out of the hardware.
Google Play and Billing: The Business of Apps
Beyond the code, Google I/O 2026 brought significant updates to the business side of Android. Play Billing Library 9.0.0 is a major release that changes how apps handle subscriptions and payments. Key changes include a new response code for blocked Play Stores and nullable URIs for external payments. Developers must plan their migration carefully to avoid runtime errors.
Google Play also introduced new features to reduce involuntary churn, such as "delayed charging" for failed payments and an extended 60-day account recovery window. These features are reported to reduce churn by up to 18%, directly impacting the bottom line for subscription-based apps. Additionally, Gemini is now pre-populating store listings across languages, and new agentic catalog management tools handle bulk price changes and metadata. The store is becoming smarter, helping developers reach more users and monetize more effectively.
Conclusion: A Unified, High-Performance Future
Google's "Compose First" declaration is the final piece of the puzzle in Android's UI evolution. By consolidating its efforts on a single, modern toolkit, Google can innovate faster and provide a better experience for developers and users alike. The transition will take time, but the destination is clear: a unified, declarative, and high-performance Android ecosystem. The library has its new section, and the books are better than ever.