权限处理

import 'package:flutter/material.dart';
import 'package:permission_handler/permission_handler.dart';

class PermissionHelper {
  static VoidCallback defaultCall = () {};

  ///检查权限
  static void check(List<Permission> permissionList,
      {String? errMsg,
      VoidCallback? onSuccess,
      VoidCallback? onFailed,
      VoidCallback? onOpenSetting}) async {
    bool flag = true;
    for (var value in permissionList) {
      var status = await value.status;
      if (!status.isGranted) {
        flag = false;
        break;
      }
    }
    if (!flag) {
      PermissionStatus permissionStatus =
          await requestPermission(permissionList);
      if (permissionStatus.isGranted) {
        onSuccess != null ? onSuccess() : defaultCall();
      } else if (permissionStatus.isDenied) {
        onFailed != null ? onFailed() : defaultCall();
      } else if (permissionStatus.isPermanentlyDenied) {
        onOpenSetting != null ? onOpenSetting() : defaultCall();
      } else if (permissionStatus.isRestricted) {
        //IOS单独处理
        onOpenSetting != null ? onOpenSetting() : defaultCall();
      } else if (permissionStatus.isLimited) {
        //IOS单独处理
        onOpenSetting != null ? onOpenSetting() : defaultCall();
      }
    }else{
      onSuccess != null ? onSuccess() : defaultCall();
    }
  }

  //申请权限
  static Future<PermissionStatus> requestPermission(
      List<Permission> permissionList) async {
    Map<Permission, PermissionStatus> statuses = await permissionList.request();
    PermissionStatus currentPermissionStatus = PermissionStatus.granted;
    statuses.forEach((key, value) {
      if (!value.isGranted) {
        currentPermissionStatus = value;
        return;
      }
    });
    return currentPermissionStatus;
  }

  static checkPermission(List<Permission> requests,
      Function(bool)? successCallback, BuildContext context) {
    PermissionHelper.check(
      requests,
      onSuccess: () {
        // 权限已授予，执行成功逻辑
        successCallback?.call(true);
      },
      onFailed: () {
        requestAgainAlert(context, callback: () async {
          // 权限未授予，执行失败逻辑
          PermissionStatus status = await requestPermission(requests);
          successCallback?.call(status.isGranted);
        });
      },
      onOpenSetting: () {
        requestAgainAlert(context, callback: () {
          // 权限未授予，执行失败逻辑
          openAppSettings();
        });
      },
    );
  }

  static requestAgainAlert(BuildContext context, {Function()? callback}) {
    showDialog(
      context: context,
      builder: (BuildContext context) {
        return AlertDialog(
          title: const Text('权限未授予'),
          content: const Text('您需要授予"定位权限"才能继续使用该功能。'),
          actions: [
            TextButton(
              onPressed: () {
                callback?.call();
                Navigator.of(context).pop();
              },
              child: const Text('确定'),
            ),
          ],
        );
      },
    );
  }
}

使用

 @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addObserver(this);
    requestLocationPermission();
  }


 Future<void> requestLocationPermission() async {
    await Future.delayed(Duration.zero); // 延迟到下一帧
    final requests = [Permission.locationWhenInUse];
    // ignore: use_build_context_synchronously
    PermissionHelper.checkPermission(requests, successCallback, context);
  }

// 处理权限申请结果业务
successCallback(bool success) async {
    if (success == false) {
      print("error $success");
      requestLocationPermission();
      return;
    }