Background Geolocation for Capacitor ·

---

The most sophisticated background location-tracking & geofencing module with battery-conscious motion-detection intelligence for iOS and Android.

The plugin's Philosophy of Operation is to use motion-detection APIs (using accelerometer, gyroscope and magnetometer) to detect when the device is moving and stationary.

• When the device is detected to be moving, the plugin will automatically start recording a location according to the configured distanceFilter (meters).

• When the device is detected be stationary, the plugin will automatically turn off location-services to conserve energy.

Also available for Flutter, Cordova, and React Native.

---

The Android module requires purchasing a license. However, it will work for DEBUG builds. It will not work with RELEASE builds without purchasing a license.

(2018) This plugin is supported full-time and field-tested daily since 2013.

---

Contents

• 😫 Help!

• 📚 API Documentation

• Installing the Plugin

• Setup Guides

• Configure your License

• Using the plugin

• Example

• Debugging

• Demo Application

• Testing Server

• Privacy Policy

🔷 Installing the Plugin

⚠️ Capacitor 3+ required.

With yarn

$ yarn add @transistorsoft/capacitor-background-geolocation
$ yarn add @transistorsoft/capacitor-background-fetch
$ npx cap sync

With npm

$ npm install @transistorsoft/capacitor-background-geolocation --save
$ npm install @transistorsoft/capacitor-background-fetch --save
$ npx cap sync

🔷 Setup Guides

iOS

• Required iOS Setup

Android

• Required Android Setup

🔷 Configure your license

1. Login to Customer Dashboard to generate an application key: www.transistorsoft.com/shop/customers

2. Add your license-key to android/app/src/main/AndroidManifest.xml:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.transistorsoft.backgroundgeolocation.react">

  <application
    android:name=".MainApplication"
    android:allowBackup="true"
    android:label="@string/app_name"
    android:icon="@mipmap/ic_launcher"
    android:theme="@style/AppTheme">

    <!-- capacitor-background-geolocation licence -->
+     <meta-data android:name="com.transistorsoft.locationmanager.license" android:value="YOUR_LICENCE_KEY_HERE" />
    .
    .
    .
  </application>
</manifest>

🔷 Using the plugin

import BackgroundGeolocation from "@transistorsoft/capacitor-background-geolocation";

🔷 Example

There are three main steps to using BackgroundGeolocation

1. Wire up event-listeners.
2. #ready the plugin.
3. #start the plugin.

⚠️ Do not execute any API method which will require accessing location-services until the callback to #ready executes (eg: #getCurrentPosition, #watchPosition, #start).

// NO!  .ready() has not resolved.
BackgroundGeolocation.getCurrentPosition(options);
BackgroundGeolocation.start();

BackgroundGeolocation.ready(config).then((state) => {
  // YES -- .ready() has now resolved.
  BackgroundGeolocation.getCurrentPosition(options);
  BackgroundGeolocation.start();  
});

// NO!  .ready() has not resolved.
BackgroundGeolocation.getCurrentPosition(options);
BackgroundGeolocation.start();

---

Example 1. — React

View Source

import {
  IonContent,
  IonHeader,
  IonPage,
  IonTitle,
  IonToolbar,
  IonButtons,
  IonToggle,
  IonItemDivider,
  IonLabel
} from '@ionic/react';

import React from "react";

import BackgroundGeolocation, {
  Subscription
} from "@transistorsoft/capacitor-background-geolocation";

const HelloWorld: React.FC = () => {
  const [ready, setReady] = React.useState(false);
  const [enabled, setEnabled] = React.useState(false);
  const [events, setEvents] = React.useState<any[]>([]);

  const addEvent = (name: string, event:any) => {
    setEvents(previous => [...previous, {
      name: name,
      json: JSON.stringify(event, null, 2)
    }]);
  }

  React.useEffect(() => {
    /// 1.  Subscribe to events.
    const onLocation:Subscription = BackgroundGeolocation.onLocation((location) => {
      addEvent('onLocation', location);
    })

    const onMotionChange:Subscription = BackgroundGeolocation.onMotionChange((event) => {
      addEvent('onMotionChange', event);
    });

    const onActivityChange:Subscription = BackgroundGeolocation.onActivityChange((event) => {
      addEvent('onActivityChange', event);
    })

    const onProviderChange:Subscription = BackgroundGeolocation.onProviderChange((event) => {
      addEvent('onProviderChange', event);
    })

    /// 2. ready the plugin.
    BackgroundGeolocation.ready({
      // Geolocation Config
      desiredAccuracy: BackgroundGeolocation.DESIRED_ACCURACY_HIGH,
      distanceFilter: 10,
      // Activity Recognition
      stopTimeout: 5,
      // Application config
      debug: true, // <-- enable this hear sounds for background-geolocation life-cycle.
      logLevel: BackgroundGeolocation.LOG_LEVEL_VERBOSE,
      stopOnTerminate: false,   // <-- Allow the background-service to continue tracking when user closes the app.
      startOnBoot: true,        // <-- Auto start tracking when device is powered-up.
    }).then((state) => {
      setReady(true);
      setEnabled(state.enabled)
      addEvent('State', state);
    });

    return () => {
      // Remove BackgroundGeolocation event-subscribers when the View is removed or refreshed
      // during development live-reload.  Without this, event-listeners will accumulate with
      // each refresh during live-reload.
      onLocation.remove();
      onMotionChange.remove();
      onActivityChange.remove();
      onProviderChange.remove();
    }
  }, []);

  /// 3. start / stop BackgroundGeolocation
  React.useEffect(() => {
    if (!ready) { return }

    if (enabled) {
      BackgroundGeolocation.start();
    } else {
      BackgroundGeolocation.stop();
      setEvents([]);
    }
  }, [enabled]);

  return (
    <IonPage>
      <IonHeader>
        <IonToolbar>
          <IonButtons slot="end">
            <IonLabel>Toggle to <code>{(enabled ? 'stop()' : 'start()')}</code> &mdash;&gt;</IonLabel>
            <IonToggle checked={enabled} onIonChange={e => setEnabled(e.detail.checked)}/>
          </IonButtons>
        </IonToolbar>
      </IonHeader>
      <IonContent fullscreen>
        <div style={{padding:10}}>
        { events.slice().reverse().map((event, i) => (
          <div key={i}>
            <p><strong>{event.name}</strong></p>
            <small><pre><code>{event.json}</code></pre></small>
            <IonItemDivider />
          </div>
        ))}
        </div>
      </IonContent>
    </IonPage>
  )
}

---

Example 2. — Angular

View Source

import {
  Component, 
  NgZone,
  OnDestroy
} from '@angular/core'

import BackgroundGeolocation, {
  Location,
  Subscription
} from "@transistorsoft/capacitor-background-geolocation";

@Component({
  selector: 'hello-world',
  template: `
    <ion-header>
      <ion-toolbar>
        <ion-buttons slot="end">
          <ion-label>Toggle to <code>{{(enabled ? 'stop()' : 'start()')}}</code> &mdash;&gt;</ion-label>
          <ion-toggle [(ngModel)]="enabled" (ionChange)="onToggleEnabled()" style="display:block;"></ion-toggle>
        </ion-buttons>
      </ion-toolbar>
    </ion-header>
    <ion-content fullscreen>
      <div *ngFor="let event of events.slice().reverse()" style="padding:10px">
        <div>
          <p><strong>{{event.name}}</strong></p>
          <small><pre><code>{{event.json}}</code></pre></small>
          <ion-item-divider></ion-item-divider>
        </div>
      </div>
    </ion-content>
  `,
  styles: []
})

export class HelloWorldPage implements OnDestroy {
  ready:boolean = false;
  enabled:boolean = false;
  events:any = [];
  subscriptions:Subscription[] = [];

  constructor(private zone:NgZone) {}

  /// WARNING:  DO NOT Use ionViewWillEnter to configure the SDK -- use ngAfterContentInit.  
  /// ionViewWillEnter only executes when the app is brought to the foreground.  
  /// It will NOT execute when the app is launched in the background, as the SDK will often do.
  /// 
  ngAfterContentInit() {
    /// Step 1:  Subscribe to BackgroundGeolocation events.
    this.subscriptions.push(BackgroundGeolocation.onLocation((location) => {
      this.addEvent('onLocation', location);
    }))

    this.subscriptions.push(BackgroundGeolocation.onMotionChange((event) => {
      this.addEvent('onMotionChange', event);
    }))

    this.subscriptions.push(BackgroundGeolocation.onActivityChange((event) => {
      this.addEvent('onActivityChange', event);
    }))

    this.subscriptions.push(BackgroundGeolocation.onProviderChange((event) => {
      this.addEvent('onProviderChange', event);
    }))

    /// Step 2:  Ready the plugin.
    BackgroundGeolocation.ready({
      // Geolocation Config
      desiredAccuracy: BackgroundGeolocation.DESIRED_ACCURACY_HIGH,
      distanceFilter: 10,
      // Activity Recognition
      stopTimeout: 5,
      // Application config
      debug: true, // <-- enable this hear sounds for background-geolocation life-cycle.
      logLevel: BackgroundGeolocation.LOG_LEVEL_VERBOSE,
      stopOnTerminate: false,   // <-- Allow the background-service to continue tracking when user closes the app.
      startOnBoot: true,        // <-- Auto start tracking when device is powered-up.
    }).then((state) => {
      // BackgroundGeolocation is now ready to use.
      this.ready = true;
      this.enabled = state.enabled;
      this.addEvent('State', state);
    });
  }

  /// When view is destroyed, be sure to .remove() all BackgroundGeolocation
  /// event-subscriptions.
  ngOnDestroy() {
    this.subscriptions.forEach((subscription:Subscription) => {
      subscription.remove();
    })
  }

  /// Add an event to the view.
  addEvent(name:string, event:any) {
    this.zone.run(() => {
      this.events.push({
        name: name, 
        json: JSON.stringify(event, null, 2)
      })  
    })    
  }

  /// Toggle the plugin on/off.
  onToggleEnabled() {
    if (!this.ready) { return }

    this.events = [];
    if (this.enabled) {
      BackgroundGeolocation.start().then((state) => {
        this.addEvent('State', state);
      })
    } else {
      BackgroundGeolocation.stop().then((state) => {
        this.addEvent('State', state);
      })
    }
  }
}

---

Promise API

The BackgroundGeolocation Javascript API supports Promises for nearly every method (the exceptions are #watchPosition and adding event-listeners via onXXX methods (eg: onLocation, onProviderChange). For more information, see the API Documentation

🔷 Demo Application

A fully-featured Demo App is available in this repo, for both React and Angular. After first cloning this repo, follow the installation instructions in the README there. This demo-app includes an advanced settings-screen allowing you to quickly experiment with all the different settings available for each platform.

🔷 Simple Testing Server

A simple Node-based web-application with SQLite database is available for field-testing and performance analysis. If you're familiar with Node, you can have this server up-and-running in about one minute.