flutter中可以使用permission_handler插件完成手机权限的检查以及开启，具体使用方式如下：
插件安装：
dependencies: permission_handler: ^5.0.1+1
插件导入：
import 'package:permission_handler/permission_handler.dart';
代码示例：
//检查功能权限
Future<bool> checkPermission(PermissionGroup permissionGroup) async {
PermissionStatus status = await PermissionHandler().checkPermissionStatus(permissionGroup);
return status == PermissionStatus.granted;
}
//检查权限如果没有则申请
Future<bool> checkAndRequestPermission(PermissionGroup permissionGroup) async {
PermissionStatus status = await PermissionHandler().checkPermissionStatus(permissionGroup);
if (status != PermissionStatus.granted) {
Map<PermissionGroup, PermissionStatus> map = await PermissionHandler().requestPermissions([permissionGroup]);
PermissionStatus status = map[permissionGroup];
if (status != PermissionStatus.granted) {
return false;
}
}
return true;
}
//打开权限设置洁面
Future<bool> openAppSetting() async {
return await PermissionHandler().openAppSettings();
}权限相关代码：
/// Defines the state of a permission group
class PermissionStatus {
const PermissionStatus._(this.value);
final int value;
/// Permission to access the requested feature is denied by the user.
static const PermissionStatus denied = PermissionStatus._(0);
/// The feature is disabled (or not available) on the device.
static const PermissionStatus disabled = PermissionStatus._(1);
/// Permission to access the requested feature is granted by the user.
static const PermissionStatus granted = PermissionStatus._(2);
/// Permission to access the requested feature is denied by the OS (only on iOS).
/// The user cannot change this app's status, possibly due to active restrictions such as
/// parental controls being in place.
static const PermissionStatus restricted = PermissionStatus._(3);
/// Permission is in an unknown state
static const PermissionStatus unknown = PermissionStatus._(4);
static const List<PermissionStatus> values = <PermissionStatus>[
denied,
disabled,
granted,
restricted,
unknown,
];
static const List<String> _names = <String>[
'denied',
'disabled',
'granted',
'restricted',
'unknown',
];
@override
String toString() => 'PermissionStatus.${_names[value]}';
}
/// Defines the state of a service related to the permission group
class ServiceStatus {
const ServiceStatus._(this.value);
final int value;
/// The service for the supplied permission group is disabled.
static const ServiceStatus disabled = ServiceStatus._(0);
/// The service for the supplied permission group is enabled.
static const ServiceStatus enabled = ServiceStatus._(1);
/// There is no service for the supplied permission group.
static const ServiceStatus notApplicable = ServiceStatus._(2);
/// The unknown service status indicates the state of the service could not be determined.
static const ServiceStatus unknown = ServiceStatus._(3);
static const List<ServiceStatus> values = <ServiceStatus>[
disabled,
enabled,
notApplicable,
unknown,
];
static const List<String> _names = <String>[
'disabled',
'enabled',
'notApplicable',
'unknown',
];
@override
String toString() => 'ServiceStatus.${_names[value]}';
}
/// Defines the permission groups for which permissions can be checked or requested.
class PermissionGroup {
const PermissionGroup._(this.value);
final int value;
/// Android: Calendar
/// iOS: Calendar (Events)
static const PermissionGroup calendar = PermissionGroup._(0);
/// Android: Camera
/// iOS: Photos (Camera Roll and Camera)
static const PermissionGroup camera = PermissionGroup._(1);
/// Android: Contacts
/// iOS: AddressBook
static const PermissionGroup contacts = PermissionGroup._(2);
/// Android: Fine and Coarse Location
/// iOS: CoreLocation (Always and WhenInUse)
static const PermissionGroup location = PermissionGroup._(3);
/// Android:
/// When running on Android < Q: Fine and Coarse Location
/// When running on Android Q and above: Background Location Permission
/// iOS: CoreLocation - Always
static const PermissionGroup locationAlways = PermissionGroup._(4);
/// Android: Fine and Coarse Location
/// iOS: CoreLocation - WhenInUse
static const PermissionGroup locationWhenInUse = PermissionGroup._(5);
/// Android: None
/// iOS: MPMediaLibrary
static const PermissionGroup mediaLibrary = PermissionGroup._(6);
/// Android: Microphone
/// iOS: Microphone
static const PermissionGroup microphone = PermissionGroup._(7);
/// Android: Phone
/// iOS: Nothing
static const PermissionGroup phone = PermissionGroup._(8);
/// Android: Nothing
/// iOS: Photos
static const PermissionGroup photos = PermissionGroup._(9);
/// Android: Nothing
/// iOS: Reminders
static const PermissionGroup reminders = PermissionGroup._(10);
/// Android: Body Sensors
/// iOS: CoreMotion
static const PermissionGroup sensors = PermissionGroup._(11);
/// Android: Sms
/// iOS: Nothing
static const PermissionGroup sms = PermissionGroup._(12);
/// Android: Microphone
/// iOS: Speech
static const PermissionGroup speech = PermissionGroup._(13);
/// Android: External Storage
/// iOS: Access to folders like `Documents` or `Downloads`. Implicitly granted.
static const PermissionGroup storage = PermissionGroup._(14);
/// Android: Ignore Battery Optimizations
static const PermissionGroup ignoreBatteryOptimizations =
PermissionGroup._(15);
/// Android: Notification
/// iOS: Notification
static const PermissionGroup notification = PermissionGroup._(16);
/// Android: Allows an application to access any geographic locations persisted in the user's shared collection.
static const PermissionGroup access_media_location = PermissionGroup._(17);
/// The unknown permission only used for return type, never requested
static const PermissionGroup unknown = PermissionGroup._(18);
static const List<PermissionGroup> values = <PermissionGroup>[
calendar,
camera,
contacts,
location,
locationAlways,
locationWhenInUse,
mediaLibrary,
microphone,
phone,
photos,
reminders,
sensors,
sms,
speech,
storage,
ignoreBatteryOptimizations,
notification,
access_media_location,
unknown,
];
static const List<String> _names = <String>[
'calendar',
'camera',
'contacts',
'location',
'locationAlways',
'locationWhenInUse',
'mediaLibrary',
'microphone',
'phone',
'photos',
'reminders',
'sensors',
'sms',
'speech',
'storage',
'ignoreBatteryOptimizations',
'notification',
'access_media_location',
'unknown',
];
@override
String toString() => 'PermissionGroup.${_names[value]}';
}