One of the unique features of mobile applications is location awareness.Mobile users bring their devices with them everywhere, and adding locationawareness to your app offers users a more contextual experience.
In order to request permissions in a standalone Android app (Managed Workflow only), you need to specify the corresponding native permission types in the android.permissions key inside app.json (read more about configuration). The mapping between Permissions values and native permission. Jul 27, 2017 Extra details Expo has released version 19 of their SDK which has the ability to set permissions for android. See docs link. There is no details on how to set no permissions, and the docs say the default will be applied when the permissions is not set in app.json without describing what those defaults are. My config looks like this.
Code samples
The ApiDemos repository on GitHub includessamples that demonstrate the use of location on a map:
![]() Working with location data
The location data available to an Android device includes the current locationof the device β pinpointed using a combination of technologies βthe direction and method of movement, and whether the device has moved acrossa predefined geographical boundary, or geofence. Depending upon the needs ofyour application, you can choose between several ways of working with locationdata:
Location permissions
If your app needs to access the user's location, you must request permission byadding the relevant Android location permission to your app.
Android offers two location permissions:
ACCESS_COARSE_LOCATION andACCESS_FINE_LOCATION . The permission you choose determines the accuracy of thelocation returned by the API. You only need to request one of the Androidlocation permissions, depending on the level of accuracy you need:
Add the permissions to the app manifest
Add one of the following permissions as a child of the
<manifest> elementin your Android manifest. Either the coarse location permission:
Or the fine location permission:
Request runtime permissions
Android 6.0 (Marshmallow) introduces a new model for handling permissions, whichstreamlines the process for users when they install and upgrade apps. If yourapp targets API level 23 or later, you can use the new permissions model.
If your app supports the new permissions model and the device is running Android6.0 (Marshmallow) or later, the user does not have to grant any permissionswhen they install or upgrade the app. The app must check to see if ithas the necessary permission at runtime, and request the permission if it doesnot have it. The system displays a dialog to the user asking for the permission.
For best user experience, it's important to request the permission in context.If location is essential to the functioning of your app, then you should requestthe location permission at app startup. A good way to do this is with a warmwelcome screen or wizard that educates users about why the permission isrequired.
If the app requires the permission for only part of its functionality, then youshould request the location permission at the time when the app performs theaction that requires the permission.
The app must gracefully handle the case where the user does not grantpermission. For example, if the permission is needed for a specific feature, theapp can disable that feature. If the permission is essential for the app tofunction, the app can disable all its functionality and inform the user thatthey need to grant the permission.
The following code sample checks for permission using the Support library beforeenabling the My Location layer:
The following sample handles the result of the permission request byimplementing the
ActivityCompat.OnRequestPermissionsResultCallback from the Support library:
For more code samples and best practices for Android runtime permissions, seethe documentation for the Android permissions model.
The My Location layer
You can use the My Location layer and the My Location button to show youruser their current position on the map. Call Note: Before enabling the My Location layer, you must ensure that you have therequired runtime location permission.
mMap.setMyLocationEnabled() to enable the My Location layer on the map.
The following sample shows a simple usage of the My Location layer:
When the My Location layer is enabled, the My Location button appears in thetop right corner of the map. When a user clicks the button, the camera centersthe map on the current location of the device, if it is known. The locationis indicated on the map by a small blue dot if the device is stationary,or as a chevron if the device is moving.
The following screenshot shows the My Location button at top right and theMy Location blue dot in the center of the map:
You can prevent the My Location button from appearing by calling
UiSettings.setMyLocationButtonEnabled(false) .
Your app can respond to the following events:
From our Terms of Service
Protect user privacy,
keep them informed
Always inform users of how you will use their data, and don't make it possible to identify individual users. Get user consent before using their location, and let them revoke consent at any time.
The Google Play services Location API
The Google Play services Location API is the preferred methodfor adding location awareness to your Android application. It includesfunctionality that lets you:
The location APIs make it easy for you to build power efficient,location-aware applications. Like the Maps SDK for Android, the LocationAPI is distributed as part of the Google Play services SDK. For moreinformation on the Location API, please refer to the Android training classMaking Your App Location Aware or the Location APIReference. Code examples are included as part of the GooglePlay services SDK.
Project with Native Code Required
The following section only applies to projects with native code exposed. If you are using the managed `expo-cli` workflow, see the guide on Permissions in the Expo documentation for the appropriate alternative.
PermissionsAndroid provides access to Android M's new permissions model. The so-called 'normal' permissions are granted by default when the application is installed as long as they appear in AndroidManifest.xml . However, 'dangerous' permissions require a dialog prompt. You should use this module for those permissions.
On devices before SDK version 23, the permissions are automatically granted if they appear in the manifest, so
check should always result to true and request should always resolve to PermissionsAndroid.RESULTS.GRANTED .
If a user has previously turned off a permission that you prompt for, the OS will advise your app to show a rationale for needing the permission. The optional
rationale argument will show a dialog prompt only if necessary - otherwise the normal permission prompt will appear.
ExamplePermissions that require prompting the user
Available as constants under
PermissionsAndroid.PERMISSIONS :
Result strings for requesting permissionsExpo How To Request Permissions For Location Download Android Windows 7
Available as constants under
PermissionsAndroid.RESULTS :
Expo How To Request Permissions For Location Download Android Windows 7
Methods
|
Name | Type | Required | Description |
---|---|---|---|
permission | string | Yes | The permission to check for. |
request()
Prompts the user to enable a permission and returns a promise resolving to a string value (see result strings above) indicating whether the user allowed or denied the request or does not want to be asked again.
If
rationale
is provided, this function checks with the OS whether it is necessary to show a dialog explaining why the permission is needed (https://developer.android.com/training/permissions/requesting.html#explain) and then shows the system permission dialog.
Parameters:
Name | Type | Required | Description |
---|---|---|---|
permission | string | Yes | The permission to request. |
rationale | object | No | See rationale below. |
Rationale:
Name | Type | Required | Description |
---|---|---|---|
title | string | Yes | The title of the dialog. |
message | string | Yes | The message of the dialog. |
buttonPositive | string | Yes | The text of the positive button. |
buttonNegative | string | No | The text of the negative button. |
buttonNeutral | string | No | The text of the neutral button. |
Expo How To Request Permissions For Location Download Android Computer
requestMultiple()
Prompts the user to enable multiple permissions in the same dialog and returns an object with the permissions as keys and strings as values (see result strings above) indicating whether the user allowed or denied the request or does not want to be asked again.
Parameters:
Name | Type | Required | Description |
---|---|---|---|
permissions | array | Yes | Array of permissions to request. |
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