A task is a simple async function that you register on
AppRegistry, similar to registering React applications:
You can do anything in your task as long as it doesn't touch UI: network requests, timers and so on. Once your task completes (i.e. the promise is resolved), React Native will go into "paused" mode (unless there are other tasks running, or there is a foreground app).
Yes, this does still require some native code, but it's pretty thin. You need to extend
HeadlessJsTaskService and override
Now, whenever you start your service, e.g. as a periodic task or in response to some system event / broadcast, JS will spin up, run your task, then spin down.
BroadcastReceiver, make sure to call
HeadlessJsTaskService.acquireWakelockNow()before returning from
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