This plugin is a geofence service with activity recognition API. It does not use the Geofence API implemented on the platform. Therefore, battery efficiency cannot be guaranteed. Instead, this plugin can provide more accurate and real-time geofancing by navigating your location while your app is alive.

Features

• Geofence can have multiple radius.
• Controls the order in which the radius comes in and provides future-async processing.
• Get what activity took place when the device entered the radius.
• Listen to changes in user activity in real time.
• Service can be operated in the background using WithForegroundService widget.

Getting started

To use this plugin, add geofence_service as a dependency in your pubspec.yaml file. For example:

dependencies:
  geofence_service: ^2.1.4

After adding the geofence_service plugin to the flutter project, we need to specify the platform-specific permissions and services to use for this plugin to work properly.

:baby_chick: Android

Since geofencing operates based on location, you need to add the following permission to the AndroidManifest.xml file. Open the AndroidManifest.xml file and specify it between the <manifest> and <application> tags.

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

In addition, if you want to run the service in the background, add the following permission. If your project supports Android 10, be sure to add the ACCESS_BACKGROUND_LOCATION permission.

<uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" />
<uses-permission android:name="android.permission.FOREGROUND_SERVICE" />

And specify the service inside the <application> tag as follows.

<service
    android:name="com.pravera.geofence_service.foreground_service.ForegroundService"
    android:stopWithTask="true" />

The biggest feature of this plugin is that it can know user activity while geofencing. Please specify the permission usage in <manifest> tag.

<uses-permission android:name="com.google.android.gms.permission.ACTIVITY_RECOGNITION" />
<uses-permission android:name="android.permission.ACTIVITY_RECOGNITION" />

And specify the service inside the <application> tag as follows.

<service
    android:name="com.pravera.geofence_service.activity_recognition.ActivityRecognitionIntentService"
    android:stopWithTask="true" />

:baby_chick: iOS

Like Android platform, geofencing is based on location, so you need to specify location permission. Open the ios/Runner/Info.plist file and add the following permission inside the <dict> tag.

<key>NSLocationWhenInUseUsageDescription</key>
<string>Used to provide geofence service.</string>

If you want the geofence service to run in the background, add the following permissions.

<key>NSLocationAlwaysAndWhenInUseUsageDescription</key>
<string>Used to provide geofence services in the background.</string>
<key>NSLocationAlwaysUsageDescription</key>
<string>Used to provide geofence services in the background.</string>
<key>UIBackgroundModes</key>
<array>
    <string>fetch</string>
    <string>location</string>
</array>

To detect changes in user activity, add the following permissions.

<key>NSMotionUsageDescription</key>
<string>Used to recognize user activity information.</string>

How to use

1. Create a geofence service instance. GeofenceService provide the following options:

• interval: Time interval to check geofence status in milliseconds. Default value is 5000.
• accuracy: Geofence error range in meters. Default value is 100.
• useActivityRecognition: Whether to use the activity recognition API. Default value is true.
• allowMockLocations: Whether to allow mock locations. Default value is false.
• geofenceRadiusSortType: Set the sort type of the geofence radius. If you have set multiple radius for one geofence, multiple radius can come in at the same time. At this time, you can control the order in which the radius comes in by referring to the radius meters. Default value is GeofenceRadiusSortType.DESC.

final geofenceService = GeofenceService.instance.setup(
  interval: 5000,
  accuracy: 100,
  useActivityRecognition: true,
  allowMockLocations: false,
  geofenceRadiusSortType: GeofenceRadiusSortType.DESC
);

2. Create a geofence and radius. Geofence and GeofenceRadius provide the following options:

• id: String ID that identifies Geofence and GeofenceRadius.
• data: Custom data for Geofence and GeofenceRadius.
• latitude: The latitude of geofence center.
• longitude: The longitude of geofence center.
• radius: The radius of geofence.
• length: Radius length in meters. The best result should be set between 100 and 150 meters in radius. If Wi-FI is available, it can be set up to 20~40m.

final geofenceList = <Geofence>[
  Geofence(
    id: 'place_1',
    latitude: 35.105136,
    longitude: 129.037513,
    radius: [
      GeofenceRadius(id: 'radius_25m', length: 25),
      GeofenceRadius(id: 'radius_100m', length: 100)
    ]
  ),
  Geofence(
    id: 'place_2',
    latitude: 35.104971,
    longitude: 129.034851,
    radius: [
      GeofenceRadius(id: 'radius_25m', length: 25),
      GeofenceRadius(id: 'radius_100m', length: 100)
    ]
  ),
];

3. Register the callback function and start the geofence service.

Future<void> onGeofenceStatusChanged(
    Geofence geofence,
    GeofenceRadius geofenceRadius,
    GeofenceStatus geofenceStatus) async {
  dev.log('geofence: ${geofence.toMap()}');
  dev.log('geofenceRadius: ${geofenceRadius.toMap()}');
  dev.log('geofenceStatus: ${geofenceStatus.toString()}\n');
}

void onActivityChanged(
    Activity prevActivity,
    Activity currActivity) {
  dev.log('prevActivity: ${prevActivity.toMap()}');
  dev.log('currActivity: ${currActivity.toMap()}\n');
}

void onError(dynamic error) {
  final errorCode = getErrorCodesFromError(error);
  if (errorCode == null) {
    dev.log('Undefined error: $error');
    return;
  }
  
  dev.log('ErrorCode: $errorCode');
}

@override
void initState() {
  super.initState();
  WidgetsBinding.instance?.addPostFrameCallback((_) {
    geofenceService.addGeofenceStatusChangedListener(onGeofenceStatusChanged);
    geofenceService.addActivityChangedListener(onActivityChanged);
    geofenceService.addStreamErrorListener(onError);
    geofenceService.start(geofenceList).catchError(onError);
  });
}

4. Add WithForegroundService widget for background execution on Android platform. WithForegroundService provide the following options:

• geofenceService: Geofence service in use on the current page.
• notificationChannelId: Channel ID for foreground service notification.
• notificationChannelName: Channel Name for foreground service notification.
• notificationContentTitle: Content Title for foreground service notification.
• notificationContentText: Content Text for foreground service notification.
• child: Child widget of current page.

@override
Widget build(BuildContext context) {
  return MaterialApp(
    // Use to run the geofence service in the background.
    // Declare between the [MaterialApp] and [Scaffold] widgets.
    home: WithForegroundService(
      geofenceService: geofenceService,
      child: Scaffold(
        appBar: AppBar(
          title: const Text('Geofence Service Example'),
          centerTitle: true
        ),
        body: buildContentView()
      ),
    ),
  );
}

5. To add or remove geofence while the service is running, use the following function:

geofenceService.addGeofence(object);
geofenceService.addGeofenceList(objectList);
geofenceService.removeGeofence(object);
geofenceService.removeGeofenceList(objectList);
geofenceService.removeGeofenceById(string);
geofenceService.clearGeofenceList();

6. When you are finished using the service, remove the callback listener and call the stop function.

geofenceService.removeGeofenceStatusChangedListener(onGeofenceStatusChanged);
geofenceService.removeActivityChangedListener(onActivityChanged);
geofenceService.removeStreamErrorListener(onError);
geofenceService.stop();

Model

:chicken: Geofence

Property	Description
id	Identifier for Geofence.
data	Custom data for Geofence.
latitude	The latitude of geofence center.
longitude	The longitude of geofence center.
radius	The radius of geofence.
status	Geofence status of Geofence.
timestamp	Timestamp when geofence status changes.
remainingDistance	Remaining distance to destination.

:chicken: GeofenceRadius

Property	Description
id	Identifier for GeofenceRadius.
data	Custom data for GeofenceRadius.
length	Radius length in meters.
status	Geofence status of GeofenceRadius.
activity	Activity when geofence status changes.
speed	Speed when geofence status changes.
timestamp	Timestamp when geofence status changes.
remainingDistance	Remaining distance to destination.

:chicken: GeofenceStatus

Value	Description
ENTER	Occur when entering the geofence radius.
EXIT	Occur when exiting the geofence radius.

:chicken: Activity

Property	Description
type	Type of activity recognized.
confidence	Confidence of activity recognized.

:chicken: ActivityType

Value	Description
IN_VEHICLE
ON_BICYCLE
ON_FOOT
RUNNING
STILL
TILTING
WALKING
UNKNOWN

:chicken: ActivityConfidence

Value	Description
HIGH
MEDIUM
LOW

:chicken: GeofenceRadiusSortType

Value	Description
ASC	Sort the meters in ascending order.
DESC	Sort the meters in descending order.

:chicken: ErrorCodes

Value	Description
ALREADY_STARTED	Occur when the service has already been started and the start function is called.
LOCATION_SERVICE_DISABLED	Occur when location service are disabled. When this error occur, you should notify the user and request activation.
LOCATION_PERMISSION_DENIED	Occur when location permission is denied.
LOCATION_PERMISSION_PERMANENTLY_DENIED	Occur when location permission is permanently denied. In this case, the user must manually set the permission.
ACTIVITY_RECOGNITION_PERMISSION_DENIED	Occur when activity recognition permission is denied.
ACTIVITY_RECOGNITION_PERMISSION_PERMANENTLY_DENIED	Occur when activity recognition permission is permanently denied. In this case, the user must manually set the permission.
ACTIVITY_NOT_REGISTERED	Occur when a channel is called when an activity object is not registered in the android platform.
PERMISSION_REQUEST_CANCELLED	Occur when permission is cancelled.
ACTIVITY_UPDATES_REQUEST_FAILED	Stream Error - Occur when activity updates request fails.
ACTIVITY_UPDATES_REMOVE_FAILED	Stream Error - Occur when activity updates remove fails.
ACTIVITY_DATA_ENCODING_FAILED	Stream Error - Occur when an error occurs in encoding the recognized activity data.