Jetpack Compose Academy · Lesson

DisposableEffect & Cleanup

When You Must Clean Up

Some setup needs a matching teardown: registering a listener, opening a sensor, or observing the lifecycle. For that you use DisposableEffect.

A DisposableEffect runs setup code and must end with an onDispose block. That block runs when the effect leaves or its key changes. 🧹

DisposableEffect(Unit) {
    sensor.start()
    onDispose { sensor.stop() }
}