background_locator #

A Flutter plugin for updating location in background.

Install #

1. Depend on it

Add this to your package's pubspec.yaml file:

dependencies:
  background_locator: ^0.0.4-beta

2. Install it

You can install packages from the command line:

with Flutter:

$ flutter pub get

Alternatively, your editor might support flutter pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:background_locator/background_locator.dart';

Setup #

Android #

1. Add the following permission to AndroidManifest.xml:

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

2. Add the following lines to your AndroidManifest.xml to register the Services and BroadcastReceiver:

        <receiver android:name="rekab.app.background_locator.LocatorBroadcastReceiver"
            android:enabled="true"
            android:exported="true"/>
        <service android:name="rekab.app.background_locator.LocatorService"
            android:permission="android.permission.BIND_JOB_SERVICE"
            android:exported="true"/>
        <service android:name="rekab.app.background_locator.IsolateHolderService"
            android:permission="android.permission.FOREGROUND_SERVICE"
            android:exported="true"
            />

3. Create an Application class and add the following lines:

class Application: FlutterApplication(), PluginRegistry.PluginRegistrantCallback {
    override fun onCreate() {
        super.onCreate()
        LocatorService.setPluginRegistrant(this)
    }
    override fun registerWith(p0: PluginRegistry?) {
        GeneratedPluginRegistrant.registerWith(p0)
    }
}

Note: Don't forget to reference your Application class in AndroidManifest.xml:

<application
        android:name=".Application"

iOS #

1. Add the following lines to AppDelegate class:

import background_locator

func registerPlugins(registry: FlutterPluginRegistry) -> () {
    GeneratedPluginRegistrant.register(with: registry)
}

@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    GeneratedPluginRegistrant.register(with: self)
    BackgroundLocatorPlugin.setPluginRegistrantCallback(registerPlugins)
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }
}

2. In app setting enable Background Modes and check Location Updates.

3. In Info.plist add Key for using location service:

NSLocationAlwaysAndWhenInUseUsageDescription
NSLocationWhenInUseUsageDescription

Usage #

1. Initialize plugin:

@override
  void initState() {
    super.initState();

    IsolateNameServer.registerPortWithName(port.sendPort, 'LocatorIsolate');
    port.listen((dynamic data) {
      // do something with data
    });
    initPlatformState();
  }
  
Future<void> initPlatformState() async {
    await BackgroundLocator.initialize();
  }

2. Call BackgroundLocator.registerLocationUpdate(callback); with similar callback:

static void callback(LocationDto locationDto) async {
    final SendPort send = IsolateNameServer.lookupPortByName('LocatorIsolate');
    send?.send(locationDto);
  }

3. Don't forget to unregister the locator when you are done:

BackgroundLocator.unRegisterLocationUpdate();