Flutter权限管理插件flutter_easy_permission的使用
Flutter权限管理插件flutter_easy_permission的使用
简介
flutter_easy_permission
是一个用于 Flutter 的权限管理插件。它是一个对 easypermissions
库的封装,支持 Android 和 iOS 平台。
- 平台支持
- ✅ Android
- ✅ iOS
使用方法
配置权限
Android
在项目的根目录下打开 android/app/src/main/AndroidManifest.xml
文件,并配置你需要的权限:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="xyz.bczl.flutter.easy_permission_example">
<!-- 配置权限 -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.CAMERA"/>
<application
android:label="flutter_easy_permission_example"
android:icon="@mipmap/ic_launcher">
<!-- 其他配置 -->
</application>
</manifest>
详细说明请参见 官方文档。
iOS
在项目的根目录下打开 ios/Runner/Info.plist
文件,并配置你需要的权限:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<!-- 配置权限 -->
<key>NSCameraUsageDescription</key>
<string>解释为什么需要该权限</string>
<!-- 其他配置 -->
</dict>
</plist>
注意替换 <string>
标签的内容,以向用户解释为什么需要该权限。
详细说明请参见 官方文档。
在 ios/Podfile
文件中添加所需的权限库:
target 'Runner' do
flutter_install_all_ios_pods File.dirname(File.realpath(__FILE__))
# 添加你需要的权限库
pod 'EasyPermissionX/Camera'
end
你可以集成以下库:
pod 'EasyPermissionX/Camera'
pod 'EasyPermissionX/Photo'
pod 'EasyPermissionX/Contact'
pod 'EasyPermissionX/Location'
pod 'EasyPermissionX/Reminder'
pod 'EasyPermissionX/Calendar'
pod 'EasyPermissionX/Microphone'
pod 'EasyPermissionX/Health'
pod 'EasyPermissionX/Net'
pod 'EasyPermissionX/Tracking'
pod 'EasyPermissionX/Media'
pod 'EasyPermissionX/Notification'
pod 'EasyPermissionX/Bluetooth'
配置完成后,在项目的 ios
目录下运行以下命令:
pod install
检查权限
const permissions = [Permissions.CAMERA];
const permissionGroup = [PermissionGroup.Camera];
bool ret = await FlutterEasyPermission.has(perms: permissions, permsGroup: permissionGroup);
请求权限
FlutterEasyPermission.request(
perms: permissions,
permsGroup: permissionGroup,
rationale: "测试需要这些权限"
);
处理回调
void initState() {
super.initState();
_easyPermission = FlutterEasyPermission()
..addPermissionCallback(
onGranted: (requestCode, perms, perm) {
debugPrint("Android 获得授权:$perms");
debugPrint("iOS 获得授权:$perm");
},
onDenied: (requestCode, perms, perm, isPermanent) {
if (isPermanent) {
FlutterEasyPermission.showAppSettingsDialog(title: "Camera");
} else {
debugPrint("Android 授权失败:$perms");
debugPrint("iOS 授权失败:$perm");
}
},
onSettingsReturned: () {
FlutterEasyPermission.has(perms: permissions, permsGroup: []).then(
(value) => value
? debugPrint("已获得授权:$permissions")
: debugPrint("未获得授权:$permissions")
);
}
);
}
void dispose() {
_easyPermission.dispose();
super.dispose();
}
当 isPermanent
返回 true
时,表示系统不会在请求权限时弹出授权对话框,因此你可能需要自己弹出一个对话框提示用户,如果必须使用此功能,可以引导用户去系统设置页面重新开启权限。
在 Android 上,你可能还需要实现 onSettingsReturned
回调函数来更好地处理权限交互。它是 showAppSettingsDialog
被调用后的回调。
示例
以下是一个完整的示例代码:
import 'package:flutter/material.dart';
import 'package:flutter_easy_permission/easy_permissions.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
static const permissions = [Permissions.CAMERA];
static const permissionGroup = [PermissionGroup.Camera];
late FlutterEasyPermission _easyPermission;
@override
void initState() {
super.initState();
_easyPermission = FlutterEasyPermission()
..addPermissionCallback(
onGranted: (requestCode, perms, perm) {
debugPrint("android获得授权:$perms");
debugPrint("iOS获得授权:$perm");
},
onDenied: (requestCode, perms, perm, isPermanent) {
if (isPermanent) {
FlutterEasyPermission.showAppSettingsDialog(title: "Camera");
} else {
debugPrint("android授权失败:$perms");
debugPrint("iOS授权失败:$perm");
}
},
onSettingsReturned: () {
FlutterEasyPermission.has(perms: permissions, permsGroup: []).then(
(value) => value
? debugPrint("已获得授权:$permissions")
: debugPrint("未获得授权:$permissions")
);
}
);
}
@override
void dispose() {
_easyPermission.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: const Text('Plugin example app'),
),
body: Center(
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
ElevatedButton(
child: Text("检查权限"),
onPressed: () {
FlutterEasyPermission.has(perms: permissions, permsGroup: permissionGroup).then(
(value) => value
? debugPrint("已获得授权")
: debugPrint("未获得授权")
);
},
),
ElevatedButton(
child: Text("请求权限"),
onPressed: () {
FlutterEasyPermission.request(
perms: permissions,
permsGroup: permissionGroup,
rationale: "测试需要这些权限"
);
},
)
],
),
),
),
);
}
}
参考
希望这篇文档对你有所帮助!如果你有任何问题或建议,请随时提出。
更多关于Flutter权限管理插件flutter_easy_permission的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
更多关于Flutter权限管理插件flutter_easy_permission的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
当然,以下是一个关于如何在Flutter项目中使用flutter_easy_permission
插件进行权限管理的代码示例。这个插件可以帮助你简化Android和iOS上的权限请求流程。
首先,确保你已经在pubspec.yaml
文件中添加了flutter_easy_permission
依赖:
dependencies:
flutter:
sdk: flutter
flutter_easy_permission: ^3.0.0 # 请使用最新版本
然后,运行flutter pub get
来安装依赖。
接下来,在你的Flutter项目中,你可以按照以下步骤使用flutter_easy_permission
:
- 导入插件:
在你的Dart文件中导入插件:
import 'package:flutter_easy_permission/flutter_easy_permission.dart';
- 检查并请求权限:
你可以使用FlutterEasyPermission
类来检查权限状态并请求权限。下面是一个示例,展示如何请求存储权限:
void main() {
runApp(MyApp());
}
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
@override
void initState() {
super.initState();
// 检查存储权限
_checkStoragePermission();
}
Future<void> _checkStoragePermission() async {
// 检查存储权限状态
var status = await FlutterEasyPermission.checkPermission(Permission.storage);
if (status == PermissionStatus.granted) {
// 权限已授予,执行相关操作
print("Storage permission is granted.");
} else if (status == PermissionStatus.denied || status == PermissionStatus.permanentlyDenied) {
// 请求存储权限
var result = await FlutterEasyPermission.requestPermission(Permission.storage);
if (result == PermissionStatus.granted) {
// 权限请求成功
print("Storage permission is requested and granted.");
} else if (result == PermissionStatus.denied || result == PermissionStatus.permanentlyDenied) {
// 权限请求被拒绝
print("Storage permission is denied.");
// 如果权限被永久拒绝,可以引导用户到设置页面手动开启
if (result == PermissionStatus.permanentlyDenied) {
// 打开应用设置页面(仅限Android)
FlutterEasyPermission.openAppSettings();
}
}
}
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text('Flutter Easy Permission Example'),
),
body: Center(
child: Text('Check console for permission status.'),
),
),
);
}
}
- 处理多个权限:
如果需要同时请求多个权限,可以使用FlutterEasyPermission.requestPermissions
方法。例如,请求存储和相机权限:
Future<void> _checkMultiplePermissions() async {
var statuses = await FlutterEasyPermission.checkPermissions([Permission.storage, Permission.camera]);
bool needRequest = false;
List<Permission> permissionsToRequest = [];
for (var status in statuses.entries) {
if (status.value == PermissionStatus.denied || status.value == PermissionStatus.permanentlyDenied) {
needRequest = true;
permissionsToRequest.add(status.key);
}
}
if (needRequest) {
var results = await FlutterEasyPermission.requestPermissions(permissionsToRequest);
for (var result in results.entries) {
if (result.value == PermissionStatus.granted) {
print("${result.key.name} permission is granted.");
} else if (result.value == PermissionStatus.denied || result.value == PermissionStatus.permanentlyDenied) {
print("${result.key.name} permission is denied.");
if (result.value == PermissionStatus.permanentlyDenied) {
FlutterEasyPermission.openAppSettings();
}
}
}
}
}
在initState
中调用_checkMultiplePermissions
即可:
@override
void initState() {
super.initState();
_checkMultiplePermissions();
}
这样,你就可以在Flutter应用中轻松地使用flutter_easy_permission
插件进行权限管理了。