import 'dart:io';
import 'package:flutter/cupertino.dart';
import 'package:flutter/services.dart';
import 'package:permission_handler/permission_handler.dart';
/// 权限检查及请求
///
/// 外部可通过此方法来进行权限的检查和请求，将自动跳转到`PermissionRequestPage`页面。
///
/// 传入 `Permission` 以及对应的权限名称 `permissionTypeStr`，如果有权限则返回 `Future true`
///
/// `isRequiredPermission` 如果为 `true`,则 "取消" 按钮将执行 "退出app" 的操作
Future<bool> permissionCheckAndRequest(
BuildContext context,
Permission permission,
String permissionTypeStr,{
bool isRequiredPermission = false
}) async {
if (!await permission.status.isGranted) {
await Navigator.of(context).push(
PageRouteBuilder(
opaque: false,
pageBuilder: ((context, animation, secondaryAnimation) {
return PermissionRequestPage(permission, permissionTypeStr, isRequiredPermission: isRequiredPermission);
}))
);
} else {
return true;
}
return false;
}
class PermissionRequestPage extends StatefulWidget {
const PermissionRequestPage(this.permission, this.permissionTypeStr,{super.key, this.isRequiredPermission = false});
final Permission permission;
final String permissionTypeStr;
final bool isRequiredPermission;
@override
State<PermissionRequestPage> createState() => _PermissionRequestPageState();
}
class _PermissionRequestPageState extends State<PermissionRequestPage> with WidgetsBindingObserver {
bool _isGoSetting = false;
late final List<String> msgList;
@override
void initState() {
super.initState();
WidgetsBinding.instance.addObserver(this);
msgList = [
"${widget.permissionTypeStr}功能需要获取您设备的${widget.permissionTypeStr}权限，否则可能无法正常工作。\n是否申请${widget.permissionTypeStr}权限？",
"${widget.permissionTypeStr}权限不全，是否重新申请权限？",
"没有${widget.permissionTypeStr}权限，您可以手动开启权限",
widget.isRequiredPermission ? "退出应用" : "取消"
];
checkPermission(widget.permission);
}
@override
void didChangeAppLifecycleState(AppLifecycleState state) {
super.didChangeAppLifecycleState(state);
// 监听 app 从后台切回前台
if (state == AppLifecycleState.resumed && _isGoSetting) {
checkPermission(widget.permission);
}
}
/// 校验权限
void checkPermission(Permission permission) async {
final status = await permission.status;
if (status.isGranted) {
_popPage();
return;
}
// 还未申请权限或之前拒绝了权限(在 iOS 上为首次申请权限，拒绝后将变为 `永久拒绝权限`)
if (status.isDenied) {
showAlert(permission, msgList[0], msgList[3], _isGoSetting ? "前往应用中心" : "确定");
}
// 权限已被永久拒绝
if (status.isPermanentlyDenied) {
_isGoSetting = true;
showAlert(permission, msgList[2], msgList[3], _isGoSetting ? "前往应用中心" : "确定");
}
// 拥有部分权限
if (status.isLimited) {
if (Platform.isIOS || Platform.isMacOS) _isGoSetting = true;
showAlert(permission, msgList[1], msgList[3], _isGoSetting ? "前往应用中心" : "确定");
}
// 拥有部分权限(仅限 iOS)
if (status.isRestricted) {
if (Platform.isIOS || Platform.isMacOS) _isGoSetting = true;
showAlert(permission, msgList[1], msgList[3], _isGoSetting ? "前往应用中心" : "确定");
}
}
void showAlert(Permission permission, String message, String cancelMsg, String confirmMsg) {
showCupertinoDialog(
context: context,
builder: (context) {
return CupertinoAlertDialog(
title: const Text("温馨提示"),
content: Text(message),
actions: [
CupertinoDialogAction(
child: Text(cancelMsg),
onPressed: () {
widget.isRequiredPermission ? _quitApp() : _popDialogAndPage(context);
}),
CupertinoDialogAction(
child: Text(confirmMsg),
onPressed: () {
if (_isGoSetting) {
openAppSettings();
_isGoSetting = true;
} else {
requestPermisson(permission);
}
_popDialog(context);
})
],
);
}
);
}
/// 申请权限
void requestPermisson(Permission permission) async {
// 申请权限
await permission.request();
// 再次校验
checkPermission(permission);
}
@override
void dispose() {
WidgetsBinding.instance.removeObserver(this);
super.dispose();
}
@override
Widget build(BuildContext context) {
return Container();
}
/// 退出应用程序
void _quitApp() {
SystemChannels.platform.invokeMethod("SystemNavigator.pop");
}
/// 关闭整个权限申请页面
void _popDialogAndPage(BuildContext dialogContext) {
_popDialog(dialogContext);
_popPage();
}
/// 关闭弹窗
void _popDialog(BuildContext dialogContext) {
Navigator.of(dialogContext).pop();
}
/// 关闭透明页面
void _popPage() {
Navigator.of(context).pop();
}
}
