Multiple listeners on one BeaconManager

BLE Beacons
1

Hi,

I’m actually trying to work with multiple region ranging. When I call the setRangingListener(), does it add a new listener or replace the previous (if it exists) listener?

In other words, can I do this:

BeaconRangingListener listener1 = new BeaconRangingListener {
    @Override
    public void onBeaconsDiscovered(BeaconRegion beaconRegion, List<Beacon> list) {
        Log.d(TAG, "Called callback for region 1.");
    }
});
BeaconRangingListener listener2 = new BeaconRangingListener {
    @Override
    public void onBeaconsDiscovered(BeaconRegion beaconRegion, List<Beacon> list) {
        Log.d(TAG, "Called callback for region 2.");
    }
});

beaconManager.setRangingListener(listener1);
beaconManager.startRanging(beaconRegion1);

beaconManager.setRangingListener(listener2);
beaconManager.startRanging(beaconRegion2);

Does it works?

2

Nope.

If you use setRangingListener(), the older listener will be destroyed.
In this case listener1 will be discarded and only listener2 will discover beacons.

3

Ty for replying.

Did you test it? Because it seems to me that it works…

4

Hmmm, I only provide the information from Android SDK Javadocs and I never tried to use more then one Listener.

For example:
I use only one EddystoneListener, but then I just filter the data and use it for different purposes.
onEddystonesfound deliver a list: List< Eddystone > list.
Later I use this list as parameter for functions like:

method1(list)
method2(list)

All this methods use different data of beacons. For example method2 looks, whether there are some Eddystone-TLM data or not. (Only for example)

All in one: I dont need more then one listener and I think, that multiple listener eat the battery and other ressources of a device and create unnecessary overhead.

In your case you must define Region for all beacons:

    public BeaconRegion(java.lang.String identifier,
                        java.util.UUID proximityUUID,
                        java.lang.Integer major,
                        java.lang.Integer minor)
    Parameters:identifier - A unique identifier for a region.Cannot be null.proximity
UUID - Location UUID of beacons.Can be null. Null indicates all location UUIDs.
major - Major version of the beacons. Can be null. Null indicates all major versions.
minor - Minor version of the beacons. Can be null. Null indicates all minor versions.
5

OK, but I want to range 2 regions (not to have to filter above), so my listener would be like this:

this.myBeaconManager.setRangingistener(new BeaconManager.BeaconRangingListener {
    @Override
    public void onBeaconsDiscovered(BeaconRegion beaconRegion, List<Beacon> list) {
        if (beaconRegion.equals(this.myBeaconRegion1)) {
            // Handle region 1 discovering callback.
        } else {
            if (beaconRegion.equals(this.myBeaconRegion2)) {
                // Handle region 2 discovering callback.
            }
        }
    }
});
6

do it in this way without using more then one listener!

7

Yes, but I will after add dynamically multiple regions to range, so I will have to map a region with a callback.
I was questioning because I’m actually working with a plug-in in which listeners are added like this.

8

try to create a HashMap < String, BeaconRegion > and just iterate through it or use HashMap.containsKey() function.
If there is a new region, just put it in a hashmap with put(“bla bla bla”,new BeaconReagion(…))

9

I will try it tomorrow!
Ty @alexander :slight_smile:

10

you’re welcome :robot: