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Interactive animation on Android.

The Kotlin runtime wraps the native library for Android (arm64-v8a and x86_64) and the desktop JVM. Load a file, start its state machine, advance it each frame and render it.

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In short

On Android, add the Ova Motion runtime AAR, load the .egg with EggPlayer.load(bytes), start a state machine, then advance and render it each frame into a bitmap or a GPU surface. Set inputs with setBool, setNumber and fire, and view model properties from Kotlin.

Platform
Android (arm64-v8a, x86_64) and the JVM
Binding
Kotlin, packaged as an AAR
Draws with
RGBA pixels, or the GPU
Same file everywhere
One .egg plays the same on every runtime
License
MIT or Apache-2.0

In Kotlin

Switch.ktkotlin
EggPlayer.load(bytes).use { p ->
    p.startStateMachine("switch")
    p.setBool("on", true)
    p.advance(1.0 / 60)
    val rgba = p.renderRgba(256, 128)
}

The AAR holds the native library for each ABI and the Kotlin wrapper; it uses JNA to reach the library.

Last checked against the product on 2026-10-15.

Examples you can play

All templates
Day / Night switch: an Ova Motion templateInterface
Day / Night switchFlick the switch or tap the scene: the sun sets behind the hills, the moon rises, stars come out and the windows light up.
Thermostat dial: an Ova Motion templateInterface
Thermostat dialTurn the dial (press and sweep around it) or use - and +: it clicks into half-degree steps, stops at the ends, and the glow goes from cool to warm.
EV charging: an Ova Motion templateInterface
EV chargingPlug the car in: the battery fills at 150 kW and tapers past 80 %, energy runs down the cable, and the panel counts the minutes left.
No connection: an Ova Motion templateInterface
No connectionAn empty state: the cloud's plug fell out. Try again spins the button, plugs it back in with a spark and brings the cloud back online.

Questions

Does it work with Jetpack Compose?

Yes. Draw the rendered frame into a Compose Canvas or an Image and forward pointer input to the player.

What can my code change at run time?

State machine inputs (booleans, numbers, triggers), view model properties bound in the file (text, numbers, colours, enums, pictures, lists), and pictures, sounds and fonts handed over by your app. Your code also reads the current state and the events the file reports.

Is the runtime free to use in commercial apps?

Yes. The runtimes are licensed MIT or Apache-2.0, and what you make in the editor is yours.

Read next

Interactive animation in SwiftUI.The Swift package wraps the runtime in EggPlayer and draws it in a SwiftUI EggView, with a Metal-backed view for the GPU and an audio helper for sound events.Interactive animation in Flutter.Two Dart packages: egg_runtime talks to the native runtime, and egg_player gives you an EggPlayer widget that advances it every frame, draws it and sends it pointer input.Animations your code can talk to.Load one .egg file, start its state machine and set inputs and data from your app. The open-source runtime draws it on a canvas or a native view and reports events back.RuntimesPlay .egg files on the web, iOS, Android, Flutter, Unity, Unreal or through the C API.

Start with an egg.
Ship an interface.

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