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254 lines
14 KiB
254 lines
14 KiB
2 years ago
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[](https://pub.dartlang.org/packages/permission_handler) [](https://github.com/Baseflow/flutter-permission-handler/actions/workflows/permission_handler.yaml) [](https://github.com/tenhobi/effective_dart) [](https://codecov.io/gh/Baseflow/flutter-permission-handler)
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On most operating systems, permissions aren't just granted to apps at install time.
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Rather, developers have to ask the user for permissions while the app is running.
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This plugin provides a cross-platform (iOS, Android) API to request permissions and check their status.
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You can also open the device's app settings so users can grant a permission.
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On Android, you can show a rationale for requesting a permission.
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## Setup
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While the permissions are being requested during runtime, you'll still need to tell the OS which permissions your app might potentially use. That requires adding permission configuration to Android- and iOS-specific files.
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<details>
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<summary>Android</summary>
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**Upgrade pre 1.12 Android projects**
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Since version 4.4.0 this plugin is implemented using the Flutter 1.12 Android plugin APIs. Unfortunately this means App developers also need to migrate their Apps to support the new Android infrastructure. You can do so by following the [Upgrading pre 1.12 Android projects](https://github.com/flutter/flutter/wiki/Upgrading-pre-1.12-Android-projects) migration guide. Failing to do so might result in unexpected behaviour. Most common known error is the permission_handler not returning after calling the `.request()` method on a permission.
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**AndroidX**
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As of version 3.1.0 the <kbd>permission_handler</kbd> plugin switched to the AndroidX version of the Android Support Libraries. This means you need to make sure your Android project is also upgraded to support AndroidX. Detailed instructions can be found [here](https://flutter.dev/docs/development/packages-and-plugins/androidx-compatibility).
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The TL;DR version is:
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1. Add the following to your "gradle.properties" file:
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```properties
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android.useAndroidX=true
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android.enableJetifier=true
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```
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1. Make sure you set the `compileSdkVersion` in your "android/app/build.gradle" file to 33:
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```gradle
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android {
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compileSdkVersion 33
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...
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}
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```
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1. Make sure you replace all the `android.` dependencies to their AndroidX counterparts (a full list can be found [here](https://developer.android.com/jetpack/androidx/migrate)).
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Add permissions to your `AndroidManifest.xml` file.
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There's a `debug`, `main` and `profile` version which are chosen depending on how you start your app.
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In general, it's sufficient to add permission only to the `main` version.
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[Here](https://github.com/Baseflow/flutter-permission-handler/blob/master/permission_handler/example/android/app/src/main/AndroidManifest.xml)'s an example `AndroidManifest.xml` with a complete list of all possible permissions.
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</details>
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<details>
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<summary>iOS</summary>
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Add permission to your `Info.plist` file.
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[Here](https://github.com/Baseflow/flutter-permission-handler/blob/master/permission_handler/example/ios/Runner/Info.plist)'s an example `Info.plist` with a complete list of all possible permissions.
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> IMPORTANT: ~~You will have to include all permission options when you want to submit your App.~~ This is because the `permission_handler` plugin touches all different SDKs and because the static code analyser (run by Apple upon App submission) detects this and will assert if it cannot find a matching permission option in the `Info.plist`. More information about this can be found [here](https://github.com/Baseflow/flutter-permission-handler/issues/26).
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The <kbd>permission_handler</kbd> plugin use [macros](https://github.com/Baseflow/flutter-permission-handler/blob/master/permission_handler/ios/Classes/PermissionHandlerEnums.h) to control whether a permission is enabled.
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You must list permission you want to use in your application :
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1. Add the following to your `Podfile` file:
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```ruby
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post_install do |installer|
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installer.pods_project.targets.each do |target|
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... # Here are some configurations automatically generated by flutter
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# Start of the permission_handler configuration
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target.build_configurations.each do |config|
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# You can enable the permissions needed here. For example to enable camera
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# permission, just remove the `#` character in front so it looks like this:
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#
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# ## dart: PermissionGroup.camera
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# 'PERMISSION_CAMERA=1'
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#
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# Preprocessor definitions can be found in: https://github.com/Baseflow/flutter-permission-handler/blob/master/permission_handler_apple/ios/Classes/PermissionHandlerEnums.h
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config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] ||= [
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'$(inherited)',
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## dart: PermissionGroup.calendar
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# 'PERMISSION_EVENTS=1',
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## dart: PermissionGroup.reminders
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# 'PERMISSION_REMINDERS=1',
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## dart: PermissionGroup.contacts
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# 'PERMISSION_CONTACTS=1',
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## dart: PermissionGroup.camera
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# 'PERMISSION_CAMERA=1',
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## dart: PermissionGroup.microphone
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# 'PERMISSION_MICROPHONE=1',
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## dart: PermissionGroup.speech
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# 'PERMISSION_SPEECH_RECOGNIZER=1',
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## dart: PermissionGroup.photos
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# 'PERMISSION_PHOTOS=1',
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## dart: [PermissionGroup.location, PermissionGroup.locationAlways, PermissionGroup.locationWhenInUse]
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# 'PERMISSION_LOCATION=1',
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## dart: PermissionGroup.notification
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# 'PERMISSION_NOTIFICATIONS=1',
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## dart: PermissionGroup.mediaLibrary
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# 'PERMISSION_MEDIA_LIBRARY=1',
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## dart: PermissionGroup.sensors
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# 'PERMISSION_SENSORS=1',
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## dart: PermissionGroup.bluetooth
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# 'PERMISSION_BLUETOOTH=1',
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## dart: PermissionGroup.appTrackingTransparency
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# 'PERMISSION_APP_TRACKING_TRANSPARENCY=1',
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## dart: PermissionGroup.criticalAlerts
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# 'PERMISSION_CRITICAL_ALERTS=1'
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]
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end
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# End of the permission_handler configuration
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end
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end
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```
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2. Remove the `#` character in front of the permission you do want to use. For example if you need access to the calendar make sure the code looks like this:
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```ruby
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## dart: PermissionGroup.calendar
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'PERMISSION_EVENTS=1',
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```
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3. Delete the corresponding permission description in `Info.plist`
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e.g. when you don't need camera permission, just delete 'NSCameraUsageDescription'
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The following lists the relationship between `Permission` and `The key of Info.plist`:
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| Permission | Info.plist | Macro |
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| ------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------- | ------------------------------------ |
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| PermissionGroup.calendar | NSCalendarsUsageDescription | PERMISSION_EVENTS |
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| PermissionGroup.reminders | NSRemindersUsageDescription | PERMISSION_REMINDERS |
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| PermissionGroup.contacts | NSContactsUsageDescription | PERMISSION_CONTACTS |
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| PermissionGroup.camera | NSCameraUsageDescription | PERMISSION_CAMERA |
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| PermissionGroup.microphone | NSMicrophoneUsageDescription | PERMISSION_MICROPHONE |
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| PermissionGroup.speech | NSSpeechRecognitionUsageDescription | PERMISSION_SPEECH_RECOGNIZER |
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| PermissionGroup.photos | NSPhotoLibraryUsageDescription | PERMISSION_PHOTOS |
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| PermissionGroup.location, PermissionGroup.locationAlways, PermissionGroup.locationWhenInUse | NSLocationUsageDescription, NSLocationAlwaysAndWhenInUseUsageDescription, NSLocationWhenInUseUsageDescription | PERMISSION_LOCATION |
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| PermissionGroup.notification | PermissionGroupNotification | PERMISSION_NOTIFICATIONS |
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| PermissionGroup.mediaLibrary | NSAppleMusicUsageDescription, kTCCServiceMediaLibrary | PERMISSION_MEDIA_LIBRARY |
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| PermissionGroup.sensors | NSMotionUsageDescription | PERMISSION_SENSORS |
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| PermissionGroup.bluetooth | NSBluetoothAlwaysUsageDescription, NSBluetoothPeripheralUsageDescription | PERMISSION_BLUETOOTH |
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| PermissionGroup.appTrackingTransparency | NSUserTrackingUsageDescription | PERMISSION_APP_TRACKING_TRANSPARENCY |
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| PermissionGroup.criticalAlerts | PermissionGroupCriticalAlerts | PERMISSION_CRITICAL_ALERTS |
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4. Clean & Rebuild
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</details>
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## How to use
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There are a number of [`Permission`](https://pub.dev/documentation/permission_handler_platform_interface/latest/permission_handler_platform_interface/Permission-class.html#constants)s.
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You can get a `Permission`'s `status`, which is either `granted`, `denied`, `restricted` or `permanentlyDenied`.
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```dart
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var status = await Permission.camera.status;
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if (status.isDenied) {
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// We didn't ask for permission yet or the permission has been denied before but not permanently.
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}
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// You can can also directly ask the permission about its status.
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if (await Permission.location.isRestricted) {
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// The OS restricts access, for example because of parental controls.
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}
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```
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Call `request()` on a `Permission` to request it.
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If it has already been granted before, nothing happens.
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`request()` returns the new status of the `Permission`.
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```dart
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if (await Permission.contacts.request().isGranted) {
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// Either the permission was already granted before or the user just granted it.
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}
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// You can request multiple permissions at once.
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Map<Permission, PermissionStatus> statuses = await [
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Permission.location,
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Permission.storage,
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].request();
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print(statuses[Permission.location]);
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```
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Some permissions, for example location or acceleration sensor permissions, have an associated service, which can be `enabled` or `disabled`.
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```dart
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if (await Permission.locationWhenInUse.serviceStatus.isEnabled) {
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// Use location.
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}
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```
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You can also open the app settings:
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```dart
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if (await Permission.speech.isPermanentlyDenied) {
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// The user opted to never again see the permission request dialog for this
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// app. The only way to change the permission's status now is to let the
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// user manually enable it in the system settings.
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openAppSettings();
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}
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```
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On Android, you can show a rationale for using a permission:
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```dart
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bool isShown = await Permission.contacts.shouldShowRequestRationale;
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```
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Some permissions will not show a dialog asking the user to allow or deny the requested permission.
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This is because the OS setting(s) of the app are being retrieved for the corresponding permission.
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The status of the setting will determine whether the permission is `granted` or `denied`.
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The following permissions will show no dialog:
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- Notification
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- Bluetooth
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The following permissions will show no dialog, but will open the corresponding setting intent for the user to change the permission status:
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- manageExternalStorage
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- systemAlertWindow
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- requestInstallPackages
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- accessNotificationPolicy
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The `locationAlways` permission can not be requested directly, the user has to request the `locationWhenInUse` permission first.
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Accepting this permission by clicking on the 'Allow While Using App' gives the user the possibility to request the `locationAlways` permission.
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This will then bring up another permission popup asking you to `Keep Only While Using` or to `Change To Always Allow`.
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## Issues
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Please file any issues, bugs or feature request as an issue on our [GitHub](https://github.com/Baseflow/flutter-permission-handler/issues) page. Commercial support is available if you need help with integration with your app or services. You can contact us at [hello@baseflow.com](mailto:hello@baseflow.com).
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## Want to contribute
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If you would like to contribute to the plugin (e.g. by improving the documentation, solving a bug or adding a cool new feature), please carefully review our [contribution guide](../CONTRIBUTING.md) and send us your [pull request](https://github.com/Baseflow/flutter-permission-handler/pulls).
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## Author
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This Permission handler plugin for Flutter is developed by [Baseflow](https://baseflow.com). You can contact us at <hello@baseflow.com>
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