Geofencing triggers multiple tasks

Help: Expo SDK
#1

Please provide the following:

  1. SDK Version: 39
  2. Platforms(Android/iOS/web/all): Android & IOS

I’ve implemented geofencing in my app following the documentation on https://docs.expo.io/versions/latest/sdk/location/#geofencing-methods.

I am facing several weird outcomes:
1.I defined 2 background tasks with TaskManager.defineTask (https://docs.expo.io/versions/latest/sdk/task-manager/) - TaskA and TaskB. Then I registered geofences with locationStartGeofencingAsync for Loc1 with TaskA and another for Loc2 with TaskB. (i.e. locationStartGeofencingAsync(TaskA,Loc1) and locationStartGeofencingAsync(TaskB,Loc2) ).

Expected Outcome:
geofence trigger for Loc1 => TaskA,
geofence trigger for Loc2 => TaskB

Actual outcome:
geofence trigger for Loc1 => Task A & Task B
geofence trigger for Loc2 => Task A & Task B

I can work around it, BUT my question is: isn’t it possible to define different geofence task for different geofence?

  1. another unexpected outcome is that on IOS I receive exit notification even when notifyOnExit is set to false. Same for entry on IOS when notifyOnEnter is set to false. (works perfectly on Anrdoid).
    I can work around it as well, BUT it is missing the point of notifyOnEnter and notifyOnExit.
    Is this the expected behaviour on IOS?

@charliecruzan I believe you are the Expo expert for this topic. Appreciate your thoughts on the above. Thanks!

#2

hi @haggaisch, how are you registering your tasks? An example Snack would be very helpful here :smile:

#3

for the sake of simplicity this is how I register the tasks:
export const GEOFENCING_TASK_A = “geofencing-task-A”;
export const GEOFENCING_TASK_B = “geofencing-task-B”;

export const defineGeofencingTasks = () => {
TaskManager.defineTask(
GEOFENCING_TASK_NAME_A,
async ({ data: { eventType, region }, error }) => {
if (error) {
console.log(error);
return;
}
if (eventType === Location.GeofencingEventType.Enter) {
console.log(“enter - Task A”);
} else if (eventType === Location.GeofencingEventType.Exit) {
console.log(“exit - Task A”);
}
}
);

TaskManager.defineTask(
GEOFENCING_TASK_NAME_B,
async ({ data: { eventType, region }, error }) => {
if (error) {
console.log(error);
return;
}
if (eventType === Location.GeofencingEventType.Enter) {
console.log(“enter - Task B”);
} else if (eventType === Location.GeofencingEventType.Exit) {
console.log(“exit - Task B”);
}
}
);
};

and executing defineGeofencingTasks()
in App.js before export default function App() {…}.

The geofences are then registered by running
Location.startGeofencingAsync(GEOFENCING_TASK_A, geofenceArray_A)
Location.startGeofencingAsync(GEOFENCING_TASK_B, geofenceArray_B)

the outcome is that for every geofence event (entry or exit for geofenceArray_A) GEOFENCING_TASK_A and GEOFENCING_TASK_B are both executed.
(for example for entry event in geofenceArray_A the console will log
“enter - Task A”
“enter - Task B”
).

#4

hm, that is definitely odd and not expected behavior :thinking: and it sounds simple enough that it should be working. This is on both iOS and Android?

could you put together a snack that reproduces that behavior? then we can open up a bug report

#5

Thanks for the step by step tutorial. This works really well for us, thank you!