Expo 定位 iconExpo 定位

提供读取地理位置信息、轮询当前位置或从设备订阅位置更新事件的库。

Android
iOS
Web

expo-location 允许从设备读取地理位置信息。你的应用可以轮询当前位置或订阅位置更新事件。

¥expo-location allows reading geolocation information from the device. Your app can poll for the current location or subscribe to location update events.

安装

¥Installation

Terminal
npx expo install expo-location

If you are installing this in an existing React Native app, start by installing expo in your project. Then, follow the additional instructions as mentioned by the library's README under "Installation in bare React Native projects" section.

应用配置中的配置

¥Configuration in app config

如果你在项目中使用配置插件(EAS 构建npx expo run:[android|ios]),则可以使用其内置的 配置插件 配置 expo-location。该插件允许你配置无法在运行时设置的各种属性,并且需要构建新的应用二进制文件才能生效。

¥You can configure expo-location using its built-in config plugin if you use config plugins in your project (EAS Build or npx expo run:[android|ios]). The plugin allows you to configure various properties that cannot be set at runtime and require building a new app binary to take effect.

Example app.json with config plugin

app.json
{
"expo": {
  "plugins": [
    [
      "expo-location",
      {
        "locationAlwaysAndWhenInUsePermission": "Allow $(PRODUCT_NAME) to use your location."
      }
    ]
  ]
}
}

Configurable properties

NameDefaultDescription
locationAlwaysAndWhenInUsePermission"Allow $(PRODUCT_NAME) to use your location"
Only for:
iOS

A string to set the NSLocationAlwaysAndWhenInUseUsageDescription permission message.

locationAlwaysPermission"Allow $(PRODUCT_NAME) to use your location"
Only for:
iOS

A string to set the NSLocationAlwaysUsageDescription permission message.

locationWhenInUsePermission"Allow $(PRODUCT_NAME) to use your location"
Only for:
iOS

A string to set the NSLocationWhenInUseUsageDescription permission message.

isIosBackgroundLocationEnabledfalse
Only for:
iOS

A boolean to enable location in the UIBackgroundModes in Info.plist.

isAndroidBackgroundLocationEnabledfalse
Only for:
Android

A boolean to enable the ACCESS_BACKGROUND_LOCATION permission.

isAndroidForegroundServiceEnabled-
Only for:
Android

A boolean to enable the FOREGROUND_SERVICE permission and FOREGROUND_SERVICE_LOCATION. Defaults to true if isAndroidBackgroundLocationEnabled is true, otherwise false.

Are you using this library in a bare React Native app?

了解如何在 expo-location 存储库中的安装说明 文件中配置原生项目。

¥Learn how to configure the native projects in the installation instructions in the expo-location repository.

背景位置

¥Background location

后台位置允许你的应用在后台运行时接收位置更新,包括位置更新和通过地理围栏进行的区域监控。此功能受平台 API 限制和系统约束:

¥Background location allows your app to receive location updates while it is running in the background and includes both location updates and region monitoring through geofencing. This feature is subject to platform API limitations and system constraints:

  • 如果用户终止应用,后台定位将停止。

    ¥Background location will stop if the user terminates the app.

  • 如果用户重新启动应用,后台定位将恢复。

    ¥Background location resumes if the user restarts the app.

  • 由于平台限制,当发生位置或地理围栏事件时,已终止的应用不会自动重启。

¥

Android
A terminated app will not automatically restart when a location or geofencing event occurs due to platform limitations.

  • 当发生新的地理围栏事件时,系统将重新启动已终止的应用。

¥

iOS
The system will restart the terminated app when a new geofence event occurs.

信息 在 Android 上,从最近的应用列表中删除应用的结果因设备供应商而异。例如,某些实现将应用从最近的应用列表中删除视为将其终止。在此处阅读有关这些差异的更多信息:https://dontkillmyapp.com

¥On Android, the result of removing an app from the recent apps list varies by device vendor. For example, some implementations treat removing an app from the recent apps list as killing it. Read more about these differences here: https://dontkillmyapp.com.

后台位置配置
iOS

¥Background location configuration 

iOS

为了能够在 iOS 上运行后台位置,你需要将 location 值添加到应用的 Info.plist 文件中的 UIBackgroundModes 数组中。

¥To be able to run background location on iOS, you need to add the location value to the UIBackgroundModes array in your app's Info.plist file.

如果你使用 CNG,所需的 UIBackgroundModes 配置将由预构建自动应用。

¥If you're using CNG, the required UIBackgroundModes configuration will be applied automatically by prebuild.

Configure UIBackgroundModes manually on iOS

如果你没有使用持续原生生成 (CNG) 或你正在使用原生 iOS 项目,那么你需要将以下内容添加到你的 Expo.plist 文件中:

¥If you're not using Continuous Native Generation (CNG) or you're using a native iOS project, then you'll need to add the following to your Expo.plist file:

ios/project-name/Supporting/Expo.plist
<key>UIBackgroundModes</key>
  <array>
    <string>location</string>
  </array>
</key>

后台位置方法

¥Background location methods

要使用后台定位方法,需要满足以下要求:

¥To use Background Location methods, the following requirements apply:

  • 必须授予位置权限。

    ¥Location permissions must be granted.

  • 后台位置任务必须在顶层范围中使用 TaskManager.defineTask 进行定义。

    ¥Background location task must be defined in the top-level scope, using TaskManager.defineTask.

  • iOS
    "location" 后台模式必须在 Info.plist 文件中指定。参见 后台位置配置

    ¥

    iOS
    "location" background mode must be specified in Info.plist file. See Background location configuration.

  • 你必须使用 开发构建 来使用后台位置,因为 Expo Go 应用不支持该功能。

¥

iOS
You must use a development build to use background location since it is not supported in the Expo Go app.

地理围栏方法

¥Geofencing methods

要使用地理围栏方法,需要满足以下要求:

¥To use Geofencing methods, the following requirements apply:

  • 必须授予位置权限。

    ¥Location permissions must be granted.

  • 地理围栏任务必须使用 TaskManager.defineTask 在顶层范围中定义。

    ¥The Geofencing task must be defined in the top-level scope, using TaskManager.defineTask.

使用地理围栏时,适用以下平台差异:

¥When using Geofencing, the following platform differences apply:

  • 每个应用允许你使用 最多 100 个活动地理围栏。

¥

Android
You are allowed up to 100 active geofences per app.

  • Expo Location 将在应用启动时报告已注册地理围栏的初始状态。

¥

iOS
Expo Location will report the initial state of the registered geofence(s) at app startup.

¥

iOS
There is a limit of 20 regions that can be simultaneously monitored.

后台权限

¥Background permissions

要在后台使用位置跟踪或地理围栏,你必须请求适当的权限:

¥To use location tracking or Geofencing in the background, you must request the appropriate permissions:

用法

¥Usage

如果你使用的是 Android 模拟器或 iOS 模拟器,请确保 位置已启用

¥If you're using the Android Emulator or iOS Simulator, ensure that Location is enabled.

Location
import { useState, useEffect } from 'react';
import { Platform, Text, View, StyleSheet } from 'react-native';
%%placeholder-start%%%%placeholder-end%%import * as Device from 'expo-device';
import * as Location from 'expo-location';

export default function App() {
const [location, setLocation] = useState<Location.LocationObject | null>(null);
const [errorMsg, setErrorMsg] = useState<string | null>(null);

useEffect(() => {
  async function getCurrentLocation() {
    %%placeholder-start%%%%placeholder-end%%if (Platform.OS === 'android' && !Device.isDevice) {
      setErrorMsg(
        'Oops, this will not work on Snack in an Android Emulator. Try it on your device!'
      );
      return;
    }
    let { status } = await Location.requestForegroundPermissionsAsync();
    if (status !== 'granted') {
      setErrorMsg('Permission to access location was denied');
      return;
    }

    let location = await Location.getCurrentPositionAsync({});
    setLocation(location);
  }

  getCurrentLocation();
}, []);

let text = 'Waiting...';
if (errorMsg) {
  text = errorMsg;
} else if (location) {
  text = JSON.stringify(location);
}

return (
  <View style={styles.container}>
    <Text style={styles.paragraph}>{text}</Text>
  </View>
);
}

const styles = StyleSheet.create({
container: {
  flex: 1,
  alignItems: 'center',
  justifyContent: 'center',
  padding: 20,
},
paragraph: {
  fontSize: 18,
  textAlign: 'center',
},
});

启用模拟器位置

¥Enable Emulator Location

安卓模拟器

¥Android Emulator

打开 Android Studio,然后启动 Android 模拟器。在其中,转到“设置”>“位置”并启用“使用位置”。

¥Open Android Studio, and launch the Android Emulator. Inside it, go to Settings > Location and enable Use location.

如果你没有在模拟器中收到位置,则可能需要关闭“提高位置准确性”设置。这将关闭 Wi-Fi 定位并仅使用 GPS。然后你可以通过模拟器使用 GPS 数据操纵位置。

¥If you don't receive the locations in the emulator, you may have to turn off the Improve Location Accuracy setting. This will turn off Wi-Fi location and only use GPS. Then you can manipulate the location with GPS data through the emulator.

对于 Android 12 及更高版本,请转到“设置”>“位置”>“位置服务”>“Google 位置精度”,然后关闭“提高位置精度”。对于 Android 11 及更低版本,请转到“设置”>“位置”>“高级”>“Google 位置精度”,然后关闭“Google 位置精度”。

¥For Android 12 and higher, go to Settings > Location > Location Services > Google Location Accuracy, and turn off Improve Location Accuracy. For Android 11 and lower, go to Settings > Location > Advanced > Google Location Accuracy, and turn off Google Location Accuracy.

iOS 模拟器

¥iOS Simulator

打开模拟器后,转到“功能”>“位置”,然后选择除“无”之外的任何选项。

¥With Simulator open, go to Features > Location and choose any option besides None.

API

import * as Location from 'expo-location';

Hooks

useBackgroundPermissions(options)

Android
iOS
Web
ParameterType
options(optional)PermissionHookOptions<object>

Check or request permissions for the background location. This uses both requestBackgroundPermissionsAsync and getBackgroundPermissionsAsync to interact with the permissions.

Returns:
[null | PermissionResponse, RequestPermissionMethod<PermissionResponse>, GetPermissionMethod<PermissionResponse>]

Example

const [status, requestPermission] = Location.useBackgroundPermissions();

useForegroundPermissions(options)

Android
iOS
Web
ParameterType
options(optional)PermissionHookOptions<object>

Check or request permissions for the foreground location. This uses both requestForegroundPermissionsAsync and getForegroundPermissionsAsync to interact with the permissions.

Returns:
[null | LocationPermissionResponse, RequestPermissionMethod<LocationPermissionResponse>, GetPermissionMethod<LocationPermissionResponse>]

Example

const [status, requestPermission] = Location.useForegroundPermissions();

Methods

Location.enableNetworkProviderAsync()

Android

Asks the user to turn on high accuracy location mode which enables network provider that uses Google Play services to improve location accuracy and location-based services.

Returns:
Promise<void>

A promise resolving as soon as the user accepts the dialog. Rejects if denied.

Location.geocodeAsync(address)

Android
iOS
ParameterTypeDescription
addressstring

A string representing address, eg. "Baker Street London".


Geocode an address string to latitude-longitude location.

On Android, you must request location permissions with requestForegroundPermissionsAsync before geocoding can be used.

Note: Geocoding is resource consuming and has to be used reasonably. Creating too many requests at a time can result in an error, so they have to be managed properly. It's also discouraged to use geocoding while the app is in the background and its results won't be shown to the user immediately.

A promise which fulfills with an array (in most cases its size is 1) of LocationGeocodedLocation objects.

Location.getBackgroundPermissionsAsync()

Android
iOS
Web

Checks user's permissions for accessing location while the app is in the background.

A promise that fulfills with an object of type PermissionResponse.

Location.getCurrentPositionAsync(options)

Android
iOS
Web
ParameterType
options(optional)LocationOptions

Requests for one-time delivery of the user's current location. Depending on given accuracy option it may take some time to resolve, especially when you're inside a building.

Note: Calling it causes the location manager to obtain a location fix which may take several seconds. Consider using getLastKnownPositionAsync if you expect to get a quick response and high accuracy is not required.

A promise which fulfills with an object of type LocationObject.

Location.getForegroundPermissionsAsync()

Android
iOS
Web

Checks user's permissions for accessing location while the app is in the foreground.

A promise that fulfills with an object of type LocationPermissionResponse.

Location.getHeadingAsync()

Android
iOS
Web

Gets the current heading information from the device. To simplify, it calls watchHeadingAsync and waits for a couple of updates, and then returns the one that is accurate enough.

A promise which fulfills with an object of type LocationHeadingObject.

Location.getLastKnownPositionAsync(options)

Android
iOS
Web
ParameterType
options(optional)LocationLastKnownOptions

Gets the last known position of the device or null if it's not available or doesn't match given requirements such as maximum age or required accuracy. It's considered to be faster than getCurrentPositionAsync as it doesn't request for the current location, but keep in mind the returned location may not be up-to-date.

Returns:
Promise<LocationObject | null>

A promise which fulfills with an object of type LocationObject or null if it's not available or doesn't match given requirements such as maximum age or required accuracy.

Location.getProviderStatusAsync()

Android
iOS
Web

Check status of location providers.

A promise which fulfills with an object of type LocationProviderStatus.

Location.hasServicesEnabledAsync()

Android
iOS
Web

Checks whether location services are enabled by the user.

Returns:
Promise<boolean>

A promise which fulfills to true if location services are enabled on the device, or false if not.

Location.hasStartedGeofencingAsync(taskName)

Android
iOS
Web
ParameterTypeDescription
taskNamestring

Name of the geofencing task to check.


Returns:
Promise<boolean>

A promise which fulfills with boolean value indicating whether the geofencing task is started or not.

Location.hasStartedLocationUpdatesAsync(taskName)

Android
iOS
Web
ParameterTypeDescription
taskNamestring

Name of the location task to check.


Returns:
Promise<boolean>

A promise which fulfills with boolean value indicating whether the location task is started or not.

Location.installWebGeolocationPolyfill()

Android
iOS
Web

Polyfills navigator.geolocation for interop with the core React Native and Web API approach to geolocation.

Returns:
void

Location.isBackgroundLocationAvailableAsync()

Android
iOS
Web
Returns:
Promise<boolean>

Location.requestBackgroundPermissionsAsync()

Android
iOS
Web

Asks the user to grant permissions for location while the app is in the background. On Android 11 or higher: this method will open the system settings page - before that happens you should explain to the user why your application needs background location permission. For example, you can use Modal component from react-native to do that.

Note: Foreground permissions should be granted before asking for the background permissions (your app can't obtain background permission without foreground permission).

A promise that fulfills with an object of type PermissionResponse.

Location.requestForegroundPermissionsAsync()

Android
iOS
Web

Asks the user to grant permissions for location while the app is in the foreground.

A promise that fulfills with an object of type LocationPermissionResponse.

Location.reverseGeocodeAsync(location)

Android
iOS
ParameterTypeDescription
locationPick<LocationGeocodedLocation, 'latitude' | 'longitude'>

An object representing a location.


Reverse geocode a location to postal address.

On Android, you must request location permissions with requestForegroundPermissionsAsync before geocoding can be used.

Note: Geocoding is resource consuming and has to be used reasonably. Creating too many requests at a time can result in an error, so they have to be managed properly. It's also discouraged to use geocoding while the app is in the background and its results won't be shown to the user immediately.

A promise which fulfills with an array (in most cases its size is 1) of LocationGeocodedAddress objects.

Location.startGeofencingAsync(taskName, regions)

Android
iOS
Web
ParameterTypeDescription
taskNamestring

Name of the task that will be called when the device enters or exits from specified regions.

regions(optional)LocationRegion[]

Array of region objects to be geofenced.

Default:[]

Starts geofencing for given regions. When the new event comes, the task with specified name will be called with the region that the device enter to or exit from. If you want to add or remove regions from already running geofencing task, you can just call startGeofencingAsync again with the new array of regions.

Task parameters

Geofencing task will be receiving following data:

  • eventType - Indicates the reason for calling the task, which can be triggered by entering or exiting the region. See GeofencingEventType.
  • region - Object containing details about updated region. See LocationRegion for more details.
Returns:
Promise<void>

A promise resolving as soon as the task is registered.

Example

import { GeofencingEventType } from 'expo-location';
import * as TaskManager from 'expo-task-manager';

 TaskManager.defineTask(YOUR_TASK_NAME, ({ data: { eventType, region }, error }) => {
  if (error) {
    // check `error.message` for more details.
    return;
  }
  if (eventType === GeofencingEventType.Enter) {
    console.log("You've entered region:", region);
  } else if (eventType === GeofencingEventType.Exit) {
    console.log("You've left region:", region);
  }
});

Location.startLocationUpdatesAsync(taskName, options)

Android
iOS
Web
ParameterTypeDescription
taskNamestring

Name of the task receiving location updates.

options(optional)LocationTaskOptions

An object of options passed to the location manager.


Registers for receiving location updates that can also come when the app is in the background.

Task parameters

Background location task will be receiving following data:

  • locations - An array of the new locations.
Returns:
Promise<void>

A promise resolving once the task with location updates is registered.

Example

import * as TaskManager from 'expo-task-manager';

TaskManager.defineTask(YOUR_TASK_NAME, ({ data: { locations }, error }) => {
 if (error) {
   // check `error.message` for more details.
   return;
 }
 console.log('Received new locations', locations);
});

Location.stopGeofencingAsync(taskName)

Android
iOS
Web
ParameterTypeDescription
taskNamestring

Name of the task to unregister.


Stops geofencing for specified task. It unregisters the background task so the app will not be receiving any updates, especially in the background.

Returns:
Promise<void>

A promise resolving as soon as the task is unregistered.

Location.stopLocationUpdatesAsync(taskName)

Android
iOS
Web
ParameterTypeDescription
taskNamestring

Name of the background location task to stop.


Stops location updates for specified task.

Returns:
Promise<void>

A promise resolving as soon as the task is unregistered.

Location.watchHeadingAsync(callback)

Android
iOS
ParameterTypeDescription
callbackLocationHeadingCallback

This function is called on each compass update. It receives an object of type LocationHeadingObject as the first argument.


Subscribe to compass updates from the device.

A promise which fulfills with a LocationSubscription object.

Location.watchPositionAsync(options, callback)

Android
iOS
Web
ParameterTypeDescription
optionsLocationOptions-
callbackLocationCallback

This function is called on each location update. It receives an object of type LocationObject as the first argument.


Subscribe to location updates from the device. Please note that updates will only occur while the application is in the foreground. To get location updates while in background you'll need to use startLocationUpdatesAsync.

A promise which fulfills with a LocationSubscription object.

Interfaces

PermissionResponse

Android
iOS
Web

An object obtained by permissions get and request functions.

PropertyTypeDescription
canAskAgainboolean

Indicates if user can be asked again for specific permission. If not, one should be directed to the Settings app in order to enable/disable the permission.

expiresPermissionExpiration

Determines time when the permission expires.

grantedboolean

A convenience boolean that indicates if the permission is granted.

statusPermissionStatus

Determines the status of the permission.

Types

LocationCallback(location)

Android
iOS
Web

Represents watchPositionAsync callback.

ParameterType
locationLocationObject
Returns:

any

LocationGeocodedAddress

Android
iOS
Web

Type representing a result of reverseGeocodeAsync.

PropertyTypeDescription
citystring | null

City name of the address.

countrystring | null

Localized country name of the address.

districtstring | null

Additional city-level information like district name.

formattedAddressstring | null
Only for:
Android

Composed string of the address components, for example, "111 8th Avenue, New York, NY".

isoCountryCodestring | null

Localized (ISO) country code of the address, if available.

namestring | null

The name of the placemark, for example, "Tower Bridge".

postalCodestring | null

Postal code of the address.

regionstring | null

The state or province associated with the address.

streetstring | null

Street name of the address.

streetNumberstring | null

Street number of the address.

subregionstring | null

Additional information about administrative area.

timezonestring | null
Only for:
iOS

The timezone identifier associated with the address.

LocationGeocodedLocation

Android
iOS
Web

Type representing a result of geocodeAsync.

PropertyTypeDescription
accuracy(optional)number

The radius of uncertainty for the location, measured in meters.

altitude(optional)number

The altitude in meters above the WGS 84 reference ellipsoid.

latitudenumber

The latitude in degrees.

longitudenumber

The longitude in degrees.

LocationHeadingCallback(location)

Android
iOS
Web

Represents watchHeadingAsync callback.

ParameterType
locationLocationHeadingObject
Returns:

any

LocationHeadingObject

Android
iOS
Web

Type of the object containing heading details and provided by watchHeadingAsync callback.

PropertyTypeDescription
accuracynumber

Level of calibration of compass:

  • 3: high accuracy
  • 2: medium accuracy
  • 1: low accuracy
  • 0: none

Reference for iOS:

  • 3: < 20 degrees uncertainty
  • 2: < 35 degrees
  • 1: < 50 degrees
  • 0: > 50 degrees
magHeadingnumber

Measure of magnetic north in degrees.

trueHeadingnumber

Measure of true north in degrees (needs location permissions, will return -1 if not given).

LocationLastKnownOptions

Android
iOS
Web

Type representing options object that can be passed to getLastKnownPositionAsync.

PropertyTypeDescription
maxAge(optional)number

A number of milliseconds after which the last known location starts to be invalid and thus null is returned.

requiredAccuracy(optional)number

The maximum radius of uncertainty for the location, measured in meters. If the last known location's accuracy radius is bigger (less accurate) then null is returned.

LocationObject

Android
iOS
Web

Type representing the location object.

PropertyTypeDescription
coordsLocationObjectCoords

The coordinates of the position.

mocked(optional)boolean
Only for:
Android

Whether the location coordinates is mocked or not.

timestampnumber

The time at which this position information was obtained, in milliseconds since epoch.

LocationObjectCoords

Android
iOS
Web

Type representing the location GPS related data.

PropertyTypeDescription
accuracynumber | null

The radius of uncertainty for the location, measured in meters. Can be null on Web if it's not available.

altitudenumber | null

The altitude in meters above the WGS 84 reference ellipsoid. Can be null on Web if it's not available.

altitudeAccuracynumber | null

The accuracy of the altitude value, in meters. Can be null on Web if it's not available.

headingnumber | null

Horizontal direction of travel of this device, measured in degrees starting at due north and continuing clockwise around the compass. Thus, north is 0 degrees, east is 90 degrees, south is 180 degrees, and so on. Can be null on Web if it's not available.

latitudenumber

The latitude in degrees.

longitudenumber

The longitude in degrees.

speednumber | null

The instantaneous speed of the device in meters per second. Can be null on Web if it's not available.

LocationOptions

Android
iOS
Web

Type representing options argument in getCurrentPositionAsync.

PropertyTypeDescription
accuracy(optional)Accuracy

Location manager accuracy. Pass one of Accuracy enum values. For low-accuracies the implementation can avoid geolocation providers that consume a significant amount of power (such as GPS).

Default:LocationAccuracy.Balanced
distanceInterval(optional)number

Receive updates only when the location has changed by at least this distance in meters. Default value may depend on accuracy option.

mayShowUserSettingsDialog(optional)boolean
Only for:
Android

Specifies whether to ask the user to turn on improved accuracy location mode which uses Wi-Fi, cell networks and GPS sensor.

Default:true
timeInterval(optional)number
Only for:
Android

Minimum time to wait between each update in milliseconds. Default value may depend on accuracy option.

LocationPermissionResponse

Android
iOS
Web

LocationPermissionResponse extends PermissionResponse type exported by expo-modules-core and contains additional platform-specific fields.

Type: PermissionResponse extended by:

PropertyTypeDescription
android(optional)PermissionDetailsLocationAndroid-
ios(optional)PermissionDetailsLocationIOS-

LocationProviderStatus

Android
iOS
Web

Represents the object containing details about location provider.

PropertyTypeDescription
backgroundModeEnabledboolean-
gpsAvailable(optional)boolean
Only for:
Android

Whether the GPS provider is available. If true the location data will come from GPS, especially for requests with high accuracy.

locationServicesEnabledboolean

Whether location services are enabled. See Location.hasServicesEnabledAsync for a more convenient solution to get this value.

networkAvailable(optional)boolean
Only for:
Android

Whether the network provider is available. If true the location data will come from cellular network, especially for requests with low accuracy.

passiveAvailable(optional)boolean
Only for:
Android

Whether the passive provider is available. If true the location data will be determined passively.

LocationRegion

Android
iOS
Web

Type representing geofencing region object.

PropertyTypeDescription
identifier(optional)string

The identifier of the region object. Defaults to auto-generated UUID hash.

latitudenumber

The latitude in degrees of region's center point.

longitudenumber

The longitude in degrees of region's center point.

notifyOnEnter(optional)boolean

Boolean value whether to call the task if the device enters the region.

Default:true
notifyOnExit(optional)boolean

Boolean value whether to call the task if the device exits the region.

Default:true
radiusnumber

The radius measured in meters that defines the region's outer boundary.

state(optional)GeofencingRegionState

One of GeofencingRegionState region state. Determines whether the device is inside or outside a region.

LocationSubscription

Android
iOS
Web

Represents subscription object returned by methods watching for new locations or headings.

PropertyTypeDescription
remove() => void

Call this function with no arguments to remove this subscription. The callback will no longer be called for location updates.

LocationTaskOptions

Android
iOS
Web

Type representing background location task options.

Type: LocationOptions extended by:

PropertyTypeDescription
activityType(optional)ActivityType
Only for:
iOS

The type of user activity associated with the location updates.

Default:ActivityType.Other

See: See Apple docs for more details.

deferredUpdatesDistance(optional)number

The distance in meters that must occur between last reported location and the current location before deferred locations are reported.

Default:0
deferredUpdatesInterval(optional)number

Minimum time interval in milliseconds that must pass since last reported location before all later locations are reported in a batched update

Default:0
deferredUpdatesTimeout(optional)number-
foregroundService(optional)LocationTaskServiceOptions-
pausesUpdatesAutomatically(optional)boolean
Only for:
iOS

A boolean value indicating whether the location manager can pause location updates to improve battery life without sacrificing location data. When this option is set to true, the location manager pauses updates (and powers down the appropriate hardware) at times when the location data is unlikely to change. You can help the determination of when to pause location updates by assigning a value to the activityType property.

Default:false
showsBackgroundLocationIndicator(optional)boolean
Only for:
iOS

A boolean indicating whether the status bar changes its appearance when location services are used in the background.

Default:false

LocationTaskServiceOptions

Android
iOS
Web
PropertyTypeDescription
killServiceOnDestroy(optional)boolean

Boolean value whether to destroy the foreground service if the app is killed.

notificationBodystring

Subtitle of the foreground service notification.

notificationColor(optional)string

Color of the foreground service notification. Accepts #RRGGBB and #AARRGGBB hex formats.

notificationTitlestring

Title of the foreground service notification.

PermissionDetailsLocationAndroid

Android
iOS
Web
PropertyTypeDescription
accuracy'fine' | 'coarse' | 'none'

Indicates the type of location provider.

PermissionDetailsLocationIOS

Android
iOS
Web
PropertyTypeDescription
scope'whenInUse' | 'always' | 'none'

The scope of granted permission. Indicates when it's possible to use location.

PermissionExpiration

Android
iOS
Web

Literal Type: multiple types

Permission expiration time. Currently, all permissions are granted permanently.

Acceptable values are: 'never' | number

PermissionHookOptions

Android
iOS
Web

Literal Type: multiple types

Acceptable values are: PermissionHookBehavior | Options

Enums

Accuracy

Android
iOS
Web

Enum with available location accuracies.

Lowest

Accuracy.Lowest = 1

Accurate to the nearest three kilometers.

Low

Accuracy.Low = 2

Accurate to the nearest kilometer.

Balanced

Accuracy.Balanced = 3

Accurate to within one hundred meters.

High

Accuracy.High = 4

Accurate to within ten meters of the desired target.

Highest

Accuracy.Highest = 5

The best level of accuracy available.

BestForNavigation

Accuracy.BestForNavigation = 6

The highest possible accuracy that uses additional sensor data to facilitate navigation apps.

ActivityType

Android
iOS
Web

Enum with available activity types of background location tracking.

Other

ActivityType.Other = 1

Default activity type. Use it if there is no other type that matches the activity you track.

AutomotiveNavigation

ActivityType.AutomotiveNavigation = 2

Location updates are being used specifically during vehicular navigation to track location changes to the automobile.

Fitness

ActivityType.Fitness = 3

Use this activity type if you track fitness activities such as walking, running, cycling, and so on.

OtherNavigation

ActivityType.OtherNavigation = 4

Activity type for movements for other types of vehicular navigation that are not automobile related.

Airborne

iOS
ActivityType.Airborne = 5

Intended for airborne activities. Fall backs to ActivityType.Other if unsupported.

GeofencingEventType

Android
iOS
Web

A type of the event that geofencing task can receive.

Enter

GeofencingEventType.Enter = 1

Emitted when the device entered observed region.

Exit

GeofencingEventType.Exit = 2

Occurs as soon as the device left observed region

GeofencingRegionState

Android
iOS
Web

State of the geofencing region that you receive through the geofencing task.

Unknown

GeofencingRegionState.Unknown = 0

Indicates that the device position related to the region is unknown.

Inside

GeofencingRegionState.Inside = 1

Indicates that the device is inside the region.

Outside

GeofencingRegionState.Outside = 2

Inverse of inside state.

PermissionStatus

Android
iOS
Web

DENIED

PermissionStatus.DENIED = "denied"

User has denied the permission.

GRANTED

PermissionStatus.GRANTED = "granted"

User has granted the permission.

UNDETERMINED

PermissionStatus.UNDETERMINED = "undetermined"

User hasn't granted or denied the permission yet.

权限

¥Permissions

安卓

¥Android

Android 版 Expo Go 中不提供前台和后台服务。相反,我们建议使用 开发构建 来避免限制。

当你安装 expo-location 模块时,它会自动添加以下权限:

¥When you install the expo-location module, it automatically adds the following permissions:

  • ACCESS_COARSE_LOCATION:获取设备的大概位置

    ¥ACCESS_COARSE_LOCATION: for approximate device location

  • ACCESS_FINE_LOCATION:用于精确的设备定位

    ¥ACCESS_FINE_LOCATION: for precise device location

以下权限是可选的:

¥The following permissions are optional:

Android PermissionDescription

ACCESS_COARSE_LOCATION

Allows an app to access approximate location.

Alternatively, you might want ACCESS_FINE_LOCATION.

ACCESS_FINE_LOCATION

Allows an app to access precise location.

Alternatively, you might want ACCESS_COARSE_LOCATION.

FOREGROUND_SERVICE

Allows a regular application to use Service.startForeground.

Allows a regular application to use Service.startForeground.

FOREGROUND_SERVICE_LOCATION

Allows a regular application to use Service.startForeground with the type "location".

Allows a regular application to use Service.startForeground with the type "location".

ACCESS_BACKGROUND_LOCATION

Allows an app to access location in the background.

If you're requesting this permission, you must also request either ACCESS_COARSE_LOCATION or ACCESS_FINE_LOCATION. Requesting this permission by itself doesn't give you location access.

排除许可

¥Excluding a permission

注意:从应用中的模块中排除所需的权限可能会破坏与该权限相对应的功能。始终确保包含模块依赖的所有权限。

¥Note: Excluding a required permission from a module in your app can break the functionality corresponding to that permission. Always make sure to include all permissions a module is dependent on.

当你的 Expo 项目无法从包含的特定权限中受益时,你可以忽略它。例如,如果你的应用不需要访问精确位置,则可以排除 ACCESS_FINE_LOCATION 权限。

¥When your Expo project doesn't benefit from having particular permission included, you can omit it. For example, if your application doesn't need access to the precise location, you can exclude the ACCESS_FINE_LOCATION permission.

另一个例子可以用 可用的位置精度 来说明。Android 定义了 3 平方公里左右的粗略定位精度估计,以及 50 米左右的精确定位精度估计。例如,如果位置精度值为 低的,则可以排除 ACCESS_FINE_LOCATION 权限。要了解有关定位精度级别的更多信息,请参阅 安卓文档

¥Another example can be stated using available location accuracies. Android defines the approximate location accuracy estimation within about 3 square kilometers, and the precise location accuracy estimation within about 50 meters. For example, if the location accuracy value is Low, you can exclude ACCESS_FINE_LOCATION permission. To learn more about levels of location accuracies, see Android documentation.

要了解有关如何排除权限的更多信息,请参阅 排除 Android 权限

¥To learn more on how to exclude permission, see Excluding Android permissions.

iOS 系统

¥iOS

该库使用以下用法描述键:

¥The following usage description keys are used by this library:

Info.plist KeyDescription

NSLocationAlwaysAndWhenInUseUsageDescription

A message that tells the user why the app is requesting access to the user’s location information at all times.

NSLocationAlwaysUsageDescription

A message that tells the user why the app is requesting access to the user's location at all times.DeprecatedFor apps deployed to targets in iOS 11 and later, use NSLocationAlwaysAndWhenInUseUsageDescription instead.

NSLocationWhenInUseUsageDescription

A message that tells the user why the app is requesting access to the user’s location information while the app is running in the foreground.