@nativescript/geolocation

Geolocation plugin to use for getting current location, monitor movement, etc.

ns plugin add @nativescript/geolocation

Important Breaking Change Version 8.0.0 of the plugin remove the Android permissions from the plugin. The developer is now responsible for adding the permission(s) that their app needs. More info below.

Permissions Android

In order to use geolocation on Android, you'll need to add the following permission(s) to your app's AndroidManifest.xml inside the App_Resources/Android/src/main dir:

  <!-- Always include this permission -->
  <!-- This permission is for "approximate" location data -->
  <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

  <!-- Include only if your app benefits from precise location access. -->
  <!-- This permission is for "precise" location data -->
  <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

  <!-- Required only when requesting background location access on
       Android 10 (API level 29) and higher. -->
  <uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" />

More information can be found in the Android docs here.

Permissions iOS

If iosAllowsBackgroundLocationUpdates is set to true, the following code is required in the info.plist file:

<key>UIBackgroundModes</key>
<array>
  <string>location</string>
</array>

Usage

The best way to explore the usage of the plugin is to inspect the demo app in the plugin's root folder. In demo folder you can find the usage of the plugin for TypeScript non-Angular application. Refer to demo/app/main-page.ts.

In short here are the steps:

Import the plugin

import * as geolocation from '@nativescript/geolocation';
import { Utils } from '@nativescript/core';
Utils.Accuracy; // used to describe at what accuracy the location should be get

Request permissions

geolocation.enableLocationRequest();

Call plugin methods

// Get current location with high accuracy
geolocation.getCurrentLocation({ desiredAccuracy: Accuracy.high, maximumAge: 5000, timeout: 20000 });

API

Properties

Property	Default	Description
latitude	-	The latitude of the geolocation, in degrees.
longitude	-	The longitude of the geolocation, in degrees.
altitude	-	The altitude (if available), in meters above sea level.
horizontalAccuracy	-	The horizontal accuracy, in meters.
verticalAccuracy	-	The vertical accuracy, in meters.
speed	-	The speed, in meters/second over ground.
timestamp	-	The time at which this location was determined.

Options

Property	Default	Description
desiredAccuracy?	Accuracy.high	This will return the finest location available but use more power than `any` option. `Accuracy.any` is considered to be about 100 meter accuracy. Using a coarse accuracy such as this often consumes less power.
updateDistance	No filter	Update distance filter in meters. Specifies how often to update the location. Read more in Apple document and/or Google documents
updateTime	1 minute	Interval between location updates, in milliseconds (ignored on iOS). Read more in Google document.
minimumUpdateTime	5 secs	Minimum time interval between location updates, in milliseconds (ignored on iOS). Read more in Google document.
maximumAge	-	How old locations to receive in ms.
timeout	5 minutes	How long to wait for a location in ms.
iosAllowsBackgroundLocationUpdates	false	If enabled, UIBackgroundModes key in info.plist is required (check the hint below). Allow the application to receive location updates in background (ignored on Android). Read more in Apple document
iosPausesLocationUpdatesAutomatically	true	Allow deactivation of the automatic pause of location updates (ignored on Android). Read more in Apple document

Methods

Method	Returns	Description
getCurrentLocation(options: Options)	Promise<Location>	Get current location applying the specified options (if any). Since version 5.0 of the plugin, it will use requestLocation API for devices using iOS 9.0+. In situation of poor or no GPS signal, but available Wi-Fi it will take 10 sec to return location.
watchLocation(successCallback: successCallbackType, errorCallback: errorCallbackType, options: Options)	number	Monitor for location change.
watchPermissionStatus(permissionCallback: permissionCallbackType, errorCallback: errorCallbackType)	number	Monitor for location permission change. Only on iOS!
clearWatch(watchId: number)	void	Stop monitoring for location change. Parameter expected is the watchId returned from `watchLocation`.
enableLocationRequest(always?: boolean, openSettingsIfLocationHasBeenDenied?: boolean)	Promise<void>	Ask for permissions to use location services. On iOS when `always` is true, it opens a custom prompt message and the following keys are required: NSLocationAlwaysAndWhenInUseUsageDescription (iOS 11.0+) OR NSLocationAlwaysUsageDescription (iOS 8.0-10.0) and NSLocationWhenInUseUsageDescription. Read more about request always usage On Android always (ACCESS_BACKGROUND_LOCATION) permission needs to be requeseted for SDK >= 29. Read about Android location permissions here. On Android SDK >= 29 the user gets prompted a system dialog with the option 'allow all the time' when the always option is selected read more When `openSettingsIfLocationHasBeenDenied` is true and the permission has previously been denied then the settings app will open so the user can change the location services permission.
isEnabled	Promise<boolean>	Resolves `true` or `false` based on the location services availability.
distance(loc1: Location, loc2: Location)	number	Calculate the distance between two locations. Returns the distance in meters.

Known Issues

Version Conflicts – Google Play Services

If you have installed multiple plugins that use the Google Play Services you might run into version conflicts. For example, you may encounter the error below when using the nativescript-google-maps-sdk plugin:

Cannot enable the location service. Error: java.lang.NoClassDefFoundError: Failed resolution of: Lcom/google/android/gms/internal/zzbck;

In order to fix this you might pin the version number in your app/App_Resources/Android/before-plugins.gradle file (if the file does not exist, just create it):

android {  
  // other stuff here

  project.ext {
    googlePlayServicesVersion = "16.+"
  }
}

Android API level 30 - openSettingsIfLocationHasBeenDenied

If the user has declined the permission twice during the installation lifetime of the app on Android API level 30 , the user won't be taken to the settings even if the openSettingsIfLocationHasBeenDenied option is true for enableLocationRequest().

License

Apache License Version 2.0