custom_permission_handler

Description:

custom permission handler

On most operating systems, permissions aren't just granted to apps at install time.
Rather, developers have to ask the user for permissions while the app is running.
This plugin provides a cross-platform (iOS, Android) API to request permissions and check their status.
You can also open the device's app settings so users can grant a permission.
On Android, you can show a rationale for requesting a permission.
See the FAQ section for more information on common questions when using the permission_handler plugin.
Setup #
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.

Android
Upgrade pre 1.12 Android projects
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 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.
AndroidX
As of version 3.1.0 the permission_handler 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.
The TL;DR version is:

Add the following to your "gradle.properties" file:

android.useAndroidX=true
android.enableJetifier=true
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Make sure you set the compileSdkVersion in your "android/app/build.gradle" file to 33:

android {
compileSdkVersion 33
...
}
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Make sure you replace all the android. dependencies to their AndroidX counterparts (a full list can be found here).

Add permissions to your AndroidManifest.xml file.
There's a debug, main and profile version which are chosen depending on how you start your app.
In general, it's sufficient to add permission only to the main version.
Here's an example AndroidManifest.xml with a complete list of all possible permissions.


iOS
Add permission to your Info.plist file.
Here's an example Info.plist with a complete list of all possible permissions.

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.

The permission_handler plugin use macros to control whether a permission is enabled.
You must list permission you want to use in your application:


Add the following to your Podfile file:
post_install do |installer|
installer.pods_project.targets.each do |target|
... # Here are some configurations automatically generated by flutter

# Start of the permission_handler configuration
target.build_configurations.each do |config|

# You can enable the permissions needed here. For example to enable camera
# permission, just remove the `#` character in front so it looks like this:
#
# ## dart: PermissionGroup.camera
# 'PERMISSION_CAMERA=1'
#
# Preprocessor definitions can be found in: https://github.com/Baseflow/flutter-permission-handler/blob/master/permission_handler_apple/ios/Classes/PermissionHandlerEnums.h
config.build_settings['GCC_PREPROCESSOR_DEFINITIONS'] ||= [
'$(inherited)',

## dart: PermissionGroup.calendar
# 'PERMISSION_EVENTS=1',

## dart: PermissionGroup.reminders
# 'PERMISSION_REMINDERS=1',

## dart: PermissionGroup.contacts
# 'PERMISSION_CONTACTS=1',

## dart: PermissionGroup.camera
# 'PERMISSION_CAMERA=1',

## dart: PermissionGroup.microphone
# 'PERMISSION_MICROPHONE=1',

## dart: PermissionGroup.speech
# 'PERMISSION_SPEECH_RECOGNIZER=1',

## dart: PermissionGroup.photos
# 'PERMISSION_PHOTOS=1',

## dart: [PermissionGroup.location, PermissionGroup.locationAlways, PermissionGroup.locationWhenInUse]
# 'PERMISSION_LOCATION=1',

## dart: PermissionGroup.notification
# 'PERMISSION_NOTIFICATIONS=1',

## dart: PermissionGroup.mediaLibrary
# 'PERMISSION_MEDIA_LIBRARY=1',

## dart: PermissionGroup.sensors
# 'PERMISSION_SENSORS=1',

## dart: PermissionGroup.bluetooth
# 'PERMISSION_BLUETOOTH=1',

## dart: PermissionGroup.appTrackingTransparency
# 'PERMISSION_APP_TRACKING_TRANSPARENCY=1',

## dart: PermissionGroup.criticalAlerts
# 'PERMISSION_CRITICAL_ALERTS=1'
]

end
# End of the permission_handler configuration
end
end
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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:
## dart: PermissionGroup.calendar
'PERMISSION_EVENTS=1',
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Delete the corresponding permission description in Info.plist
e.g. when you don't need camera permission, just delete 'NSCameraUsageDescription'
The following lists the relationship between Permission and The key of Info.plist:



Permission
Info.plist
Macro




PermissionGroup.calendar
NSCalendarsUsageDescription
PERMISSION_EVENTS


PermissionGroup.reminders
NSRemindersUsageDescription
PERMISSION_REMINDERS


PermissionGroup.contacts
NSContactsUsageDescription
PERMISSION_CONTACTS


PermissionGroup.camera
NSCameraUsageDescription
PERMISSION_CAMERA


PermissionGroup.microphone
NSMicrophoneUsageDescription
PERMISSION_MICROPHONE


PermissionGroup.speech
NSSpeechRecognitionUsageDescription
PERMISSION_SPEECH_RECOGNIZER


PermissionGroup.photos
NSPhotoLibraryUsageDescription
PERMISSION_PHOTOS


PermissionGroup.location, PermissionGroup.locationAlways, PermissionGroup.locationWhenInUse
NSLocationUsageDescription, NSLocationAlwaysAndWhenInUseUsageDescription, NSLocationWhenInUseUsageDescription
PERMISSION_LOCATION


PermissionGroup.notification
PermissionGroupNotification
PERMISSION_NOTIFICATIONS


PermissionGroup.mediaLibrary
NSAppleMusicUsageDescription, kTCCServiceMediaLibrary
PERMISSION_MEDIA_LIBRARY


PermissionGroup.sensors
NSMotionUsageDescription
PERMISSION_SENSORS


PermissionGroup.bluetooth
NSBluetoothAlwaysUsageDescription, NSBluetoothPeripheralUsageDescription
PERMISSION_BLUETOOTH


PermissionGroup.appTrackingTransparency
NSUserTrackingUsageDescription
PERMISSION_APP_TRACKING_TRANSPARENCY


PermissionGroup.criticalAlerts
PermissionGroupCriticalAlerts
PERMISSION_CRITICAL_ALERTS





Clean & Rebuild



How to use #
There are a number of Permissions.
You can get a Permission's status, which is either granted, denied, restricted, permanentlyDenied, limited, or provisional.
var status = await Permission.camera.status;
if (status.isDenied) {
// We didn't ask for permission yet or the permission has been denied before, but not permanently.
}

// You can can also directly ask the permission about its status.
if (await Permission.location.isRestricted) {
// The OS restricts access, for example because of parental controls.
}
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Call request() on a Permission to request it.
If it has already been granted before, nothing happens.
request() returns the new status of the Permission.
if (await Permission.contacts.request().isGranted) {
// Either the permission was already granted before or the user just granted it.
}

// You can request multiple permissions at once.
Map<Permission, PermissionStatus> statuses = await [
Permission.location,
Permission.storage,
].request();
print(statuses[Permission.location]);
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Some permissions, for example location or acceleration sensor permissions, have an associated service, which can be enabled or disabled.
if (await Permission.locationWhenInUse.serviceStatus.isEnabled) {
// Use location.
}
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You can also open the app settings:
if (await Permission.speech.isPermanentlyDenied) {
// The user opted to never again see the permission request dialog for this
// app. The only way to change the permission's status now is to let the
// user manually enable it in the system settings.
openAppSettings();
}
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On Android, you can show a rationale for using a permission:
bool isShown = await Permission.contacts.shouldShowRequestRationale;
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Some permissions will not show a dialog asking the user to allow or deny the requested permission.
This is because the OS setting(s) of the app are being retrieved for the corresponding permission.
The status of the setting will determine whether the permission is granted or denied.
The following permissions will show no dialog:

Notification
Bluetooth

The following permissions will show no dialog, but will open the corresponding setting intent for the user to change the permission status:

manageExternalStorage
systemAlertWindow
requestInstallPackages
accessNotificationPolicy

The locationAlways permission can not be requested directly, the user has to request the locationWhenInUse permission first.
Accepting this permission by clicking on the 'Allow While Using App' gives the user the possibility to request the locationAlways permission.
This will then bring up another permission popup asking you to Keep Only While Using or to Change To Always Allow.
FAQ #
Requesting "storage" permissions always returns "denied" on Android 13+. What can I do? #
On Android the Permission.storage permission is linked to the Android READ_EXTERNAL_STORAGE and WRITE_EXTERNAL_STORAGE permissions. Starting from Android 10 (API 29) the READ_EXTERNAL_STORAGE and WRITE_EXTERNAL_STORAGE permissions have been marked deprecated and have been fully removed/disabled since Android 13 (API 33).
If your application needs access to media files Google recommends using the READ_MEDIA_IMAGES, READ_MEDIA_VIDEOS or READ_MEDIA_AUDIO permissions instead. These can be requested using the Permission.photos, Permission.videos and Permission.audio respectively. To request these permissions make sure the compileSdkVersion in the android/app/build.gradle file is set to 33.
If your application needs access to Android's file system, it is possible to request the MANAGE_EXTERNAL_STORAGE permission (using Permission.manageExternalStorage). As of Android 11 (API 30), the MANAGE_EXTERNAL_STORAGE permission is considered a high-risk or sensitive permission. Therefore it is required to declare the use of these permissions if you intend to release the application via the Google Play Store.
Requesting Permission.locationAlways always returns "denied" on Android 10+ (API 29+). What can I do? #
Starting with Android 10, apps are required to first obtain the permission to read the device's location in the foreground, before requesting to read the location in the background as well. When requesting for the 'location always' permission directly, or when requesting both permissions at the same time, the system will ignore the request. So, instead of calling only Permission.location.request(), make sure to first call either Permission.location.request() or Permission.locationWhenInUse.request(), and obtain permission to read the GPS. Once you obtain this permission, you can call Permission.locationAlways.request(). This will present the user with the option to update the settings so the location can always be read in the background. For more information, visit the Android documentation on requesting location permissions.
Issues #
Please file any issues, bugs or feature request as an issue on our GitHub page. Commercial support is available if you need help with integration with your app or services. You can contact us at [email protected].
Want to contribute #
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 and send us your pull request.
Author #
This Permission handler plugin for Flutter is developed by Baseflow. You can contact us at [email protected]