What is agera?

Agera is a Java library from Google for building Android apps that react to changing data. The idea is that instead of manually checking for updates or juggling threads, you describe what should happen when something changes, and the library handles the rest. This approach is called reactive programming. The library works with Android apps that use SDK version 9 or higher. You add it to your project via Gradle, a common build tool for Android development. The setup is a single line pointing to the published package. Beyond the core library, Agera also ships several optional extension modules. Each extension covers a specific area: one for reading shared app preferences and listening to system broadcasts, one for SQLite databases, one for making HTTP network requests, one for populating list views, and one for list views that use data binding. Each extension is a separate Gradle dependency, so you only include what you need. The README is sparse on code examples but points to an official wiki and a hands-on tutorial (called a Codelab) hosted by Google. Unofficial wiki translations exist in Chinese and Korean, and at least one community-built extension for network requests via the Retrofit library is referenced.