使用您自己的监视器

您还可以使用监控服务，并通过使用Places扩展API与Places服务集成。

注册地理围栏

如果决定使用监视服务，请完成以下步骤以注册当前位置周围的POI的地理围栏：

iOS

在iOS中，完成以下步骤：

1. 将从iOS的核心位置服务获取的位置更新传递到Places扩展。

2. 使用 getNearbyPointsOfInterest 放置扩展API以获取数组 ACPPlacesPoi 当前位置周围的对象。

   - (void) locationManager: (CLLocationManager*) manager didUpdateLocations: (NSArray<CLLocation*>*) locations {
       [ACPPlaces getNearbyPointsOfInterest:currentLocation limit:10 callback: ^ (NSArray<ACPPlacesPoi*>* _Nullable nearbyPoi) {
           [self startMonitoringGeoFences:nearbyPoi];
       }];
   }
   

3. 从获取的信息中提取信息 ACPPlacesPOI 对象并开始监视这些POI。

   - (void) startMonitoringGeoFences: (NSArray*) newGeoFences {
       // verify if the device supports monitoring geofences
       // check for location permission
   
       for (ACPPlacesPoi * currentRegion in newGeoFences) {
           // make the circular region
           CLLocationCoordinate2D center = CLLocationCoordinate2DMake(currentRegion.latitude, currentRegion.longitude);
           CLCircularRegion* currentCLRegion = [[CLCircularRegion alloc] initWithCenter:center
                                                                                 radius:currentRegion.radius
                                                                             identifier:currentRegion.identifier];
           currentCLRegion.notifyOnExit = YES;
           currentCLRegion.notifyOnEntry = YES;
   
           // start monitoring the new region
           [_locationManager startMonitoringForRegion:currentCLRegion];
       }
   }
   

Android

1. 将从Google Play服务或Android位置服务获取的位置更新传递到Places扩展。

2. 使用 getNearbyPointsOfInterest Places扩展API可获取 PlacesPoi 当前位置周围的对象。

   LocationCallback callback = new LocationCallback() {
       @Override
       public void onLocationResult(LocationResult locationResult) {
           super.onLocationResult(locationResult);
   
           Places.getNearbyPointsOfInterest(currentLocation, 10, new AdobeCallback<List<PlacesPOI>>() {
               @Override
               public void call(List<PlacesPOI> pois) {
                   starMonitoringGeofence(pois);
               }
           });
       }
   };
   

3. 从获取的数据中提取数据 PlacesPOI 对象并开始监视这些POI。

   private void startMonitoringFences(final List<PlacesPOI> nearByPOIs) {
       // check for location permission
       for (PlacesPOI poi : nearByPOIs) {
           final Geofence fence = new Geofence.Builder()
               .setRequestId(poi.getIdentifier())
               .setCircularRegion(poi.getLatitude(), poi.getLongitude(), poi.getRadius())
               .setExpirationDuration(Geofence.NEVER_EXPIRE)
               .setTransitionTypes(Geofence.GEOFENCE_TRANSITION_ENTER |
                                   Geofence.GEOFENCE_TRANSITION_EXIT)
               .build();
           geofences.add(fence);
       }
   
       GeofencingRequest.Builder builder = new GeofencingRequest.Builder();
       builder.setInitialTrigger(GeofencingRequest.INITIAL_TRIGGER_ENTER);
       builder.addGeofences(geofences);
       builder.build();
       geofencingClient.addGeofences(builder.build(), geoFencePendingIntent)
   }
   

调用 getNearbyPointsOfInterest API会导致网络调用，以获取当前位置周围的位置。

发布地理围栏事件

iOS

在iOS中，调用 processGeofenceEvent 将API放入 CLLocationManager 委派。 此API会通知您用户是否已进入或退出特定区域。

- (void) locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region {
    [ACPPlaces processRegionEvent:region forRegionEventType:ACPRegionEventTypeEntry];
}

- (void) locationManager:(CLLocationManager *)manager didExitRegion:(CLRegion *)region {
    [ACPPlaces processRegionEvent:region forRegionEventType:ACPRegionEventTypeExit];
}

Android

在Android中，调用 processGeofence 方法，以及地理围栏广播接收器中的相应过渡事件。 您可能希望组织收到的地理围栏列表，以防止重复进入/退出。

void onGeofenceReceived(final Intent intent) {
    // do appropriate validation steps for the intent
    ...

    // get GeofencingEvent from intent
    GeofencingEvent geoEvent = GeofencingEvent.fromIntent(intent);

    // get the transition type (entry or exit)
    int transitionType = geoEvent.getGeofenceTransition();

    // validate your geoEvent and get the necessary Geofences from the list
    List<Geofence> myGeofences = geoEvent.getTriggeringGeofences();

    // process region events for your geofences
    for (Geofence geofence : myGeofences) {
        Places.processGeofence(geofence, transitionType);
    }
}

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