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google/agera

★ 7,131JavaAudience · developerComplexity · 3/5Setup · easy

TLDR

A Google-built Java library for Android that lets your app react automatically to changing data, database updates, network responses, preference changes, without manually polling or managing threads.

Mindmap

mindmap
  root((Agera))
    What it does
      Reactive data flow
      Auto UI updates
      Thread management
    Tech Stack
      Java
      Android SDK
      Gradle
    Extensions
      Preferences
      SQLite database
      HTTP network
      List views
    Use Cases
      Live data display
      Network fetching
      Database sync
    Setup
      Single Gradle line
      SDK 9 plus
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Things people build with this

USE CASE 1

Build an Android app screen that updates its UI automatically when shared preferences or database data changes, without polling.

USE CASE 2

Use the Agera network extension to make HTTP requests reactively and refresh a list view when the response arrives.

USE CASE 3

React to SQLite database changes and automatically update a RecyclerView list without writing thread management boilerplate.

Tech stack

JavaAndroidGradle

Getting it running

Difficulty · easy Time to first run · 30min

Requires Android SDK 9 or higher, optional extensions are separate Gradle dependencies added only as needed.

In plain English

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.

Copy-paste prompts

Prompt 1
Set up Agera in my Android project and create a reactive flow that updates a TextView automatically when user preferences change.
Prompt 2
Use Agera's list extension to build a RecyclerView that refreshes automatically whenever my data source is updated.
Prompt 3
Add the Agera HTTP network extension and fetch JSON from an API to display results reactively in my Android app.
Prompt 4
Walk me through Agera's reactive programming model and show me how it compares to using LiveData in a practical example.
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