Observable is not working when app is running in background in ionic? - ionic-framework

Question

When I do Login I am starting to check observable working but when application is in background it is not executing. I am using observable because after every 5 seconds refresh should happen. It seems it is not running in background. Any other solution to run the code after every 1 minute whether application is in background or foreground. Thanks in advance !
Loginsuccessfully
this.provider.startBackgroundRefreshInterval();
In service class below code added
startBackgroundRefreshInterval() {
var refreshInterval = localStore.getPersistedData(App.ISCHECKBOX_KEY);
this.timerSubscription = Observable.interval(parseInt(refreshInterval))
.subscribe((val) => {
console.log("Observable subscribed");
});
}
/**
* unsubscribe subscription
*/
unSubscribeOnehourSubscription() {
console.log("Observable Unsubscribed");
this.timerOneHourSubscription.unsubscribe();
}
Now refreshInterval is based on checkbox value selection
updateCheckboxList(value:any) {
this.service.unSubscribeSubscription();
this.service.startBackgroundRefreshInterval();
}
Once application will go in background Observable not calling
currently refreshInterval selected as 1 minute
what is other way to call functon continuosly in background in ionic ?

Answer 1

I am currently working on the same thing. While I can't say I know all the things about this, here is what I have found so far.
When your app goes to the background, it is essentially put to sleep. Meaning none of the code you are counting on, including intervals is going to execute.
Here are some solutions to this problem I have worked on.
1) BackgroundFetch as seen here in this cordova plugin https://github.com/transistorsoft/cordova-plugin-background-fetch and https://ionicframework.com/docs/native/background-fetch will in both android and ios attempt to run a callback every approximately 15 minutes (read the link for why that timing is a thing).
2) BackgroundMode as seen here https://ionicframework.com/docs/native/background-mode will put your app into a "stay active while in background" mode that you can control. This will work in keeping your app up and running even in background, but you may find that this is not acceptable to the stores (particularly might get rejected by ios store).
That's what I've found thus far. Hope it's helpful.