# Location and Geofences

Bubbl uses your device location to fetch the correct campaigns and geofences.

## Step 1: Start tracking after permissions


```kotlin
BubblSdk.startLocationTracking(this)
```

## Why

This enables the SDK’s background updates and geofence refresh logic.

## Step 2: Manually refresh campaigns with a known location


```kotlin
LocationServices.getFusedLocationProviderClient(this).lastLocation
    .addOnSuccessListener { location: Location? ->
        if (location != null) {
            BubblSdk.refreshGeofence(location.latitude, location.longitude)
        } else {
            BubblSdk.forceRefreshCampaigns()
        }
    }
```

## Why

Manual refresh ensures geofences are loaded even before the SDK’s periodic refresh runs.

## Step 3: Optional map visualizationIf you want to show geofences on a map, use `BubblSdk.geofenceFlow`.


```kotlin
lifecycleScope.launch {
    BubblSdk.geofenceFlow.collectLatest { snap ->
        snap ?: return@collectLatest
        googleMap.clear()
        snap.polygons.forEach { poly ->
            googleMap.addPolygon(
                PolygonOptions()
                    .addAll(poly.vertices)
                    .strokeColor(0xFF1976D2.toInt())
                    .fillColor(0x331976D2)
            )
        }
    }
}
```

Tooltip
This is a debug visualization. You can omit map dependencies in production apps.