Compose Beyond UI — Crafting Melodies Declaratively

Compose has become widely adopted as a UI framework, but did you know that its mechanisms can be applied beyond UI as well? Among the modules that make up Compose, the lowest-level layer—Runtime—is designed for general-purpose use, not just building UIs. Yet, everyday UI development touches only a subset of its APIs, so its full capabilities remain largely not known. Runtime provides foundational APIs that let you write and execute code declaratively, underpinning Compose’s declarative programming style. By understanding and leveraging Runtime, you can apply Compose’s declarative approach to your own logic. This session shines a spotlight on the Runtime you normally use unconsciously and showcases practical examples. We will explain Runtime’s role inside Compose and demonstrate how to adapt it to your own processes. As an example of Runtime applied beyond UI, you’ll be presented a demo of “declarative audio processing,” which plays melodies and sound effects directly from declarative code. Through this session, you will gain insight into Compose’s inner workings and acquire a perspective on declarative programming that extends beyond UI. Experience the vast possibilities of Compose. (Translated by the DroidKaigi Committee)

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  usuiat Android Engineer