liangchengyou / wow_english

import 'dart:async';
import 'dart:io';
import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:wow_english/common/core/app_config_helper.dart';
import 'package:wow_english/common/permission/permissionRequester.dart';

import '../../utils/log_util.dart';

///带有隐私合规弹窗的透明权限申请页面，主要应对android各大应用市场对隐私权限申请需同步告知索取权限目的
class PermissionRequestPage extends StatefulWidget {
  const PermissionRequestPage(this.permissions,
      this.permissionNames, this.permissionDesc,
      {super.key, this.isRequiredPermission = false});

  final List<Permission> permissions;
  final List<String> permissionNames;
  final String permissionDesc;

  ///是否需要强制授予
  final bool isRequiredPermission;

  @override
  State<PermissionRequestPage> createState() => _PermissionRequestPageState();
}

class _PermissionRequestPageState extends State<PermissionRequestPage>
    with WidgetsBindingObserver {
  bool _isGoSetting = false;
  late final List<String> msgList;
  bool _isDialogShowing = false;

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addObserver(this);
    String permissionDesc = widget.permissionDesc;
    String permissionStr = widget.permissionNames.join('、');
    msgList = [
      "$permissionDesc，需要获取您设备的$permissionStr权限",
      "你还没有开启$permissionStr权限，开启后即可$permissionDesc",
      "未开启$permissionStr权限导致功能受限，您可以手动开启权限",
      widget.isRequiredPermission ? "退出应用" : "以后再说"
    ];
    _handlePermission(widget.permissions);
  }

  @override
  Widget build(BuildContext context) {
    double screenWidth = MediaQuery.of(context).size.width;
    // PackageInfo packageInfo = await PackageInfo.fromPlatform();
    // String packageName = packageInfo.packageName;
    return Scaffold(
        backgroundColor: Colors.transparent,
        body: Align(
            alignment: Alignment.topCenter,
            child: Container(
                width: screenWidth / 2,
                padding: const EdgeInsets.all(16.0),
                decoration: BoxDecoration(
                  color: Colors.white,
                  borderRadius: BorderRadius.circular(10.0), // 圆角半径
                  boxShadow: const [
                    BoxShadow(
                      color: Colors.black26,
                      blurRadius: 4.0,
                      offset: Offset(2, 2),
                    ),
                  ],
                ),
                child: Column(
                  mainAxisSize: MainAxisSize.min,
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Center(
                      child: Text(
                        '${widget.permissionNames.join('、')}权限使用说明',
                        style: TextStyle(
                            color: Colors.black,
                            fontSize: 15.sp,
                            fontWeight: FontWeight.w500,
                            fontFamily: 'PingFangSC-Regular'),
                        textAlign: TextAlign.left,
                      ),
                    ),
                    16.verticalSpace,
                    Text(
                      widget.permissionDesc,
                      style: const TextStyle(color: Colors.black54,
                          fontFamily: 'PingFangSC-Regular'),
                      textAlign: TextAlign.left,
                    ),
                  ],
                ))));
  }

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    super.didChangeAppLifecycleState(state);
    Log.d("didChangeAppLifecycleState state=$state _isGoSetting=$_isGoSetting");
    // 监听 app 从后台切回前台
    if (state == AppLifecycleState.resumed && _isGoSetting && !_isDialogShowing) {
      _handlePermission(widget.permissions);
    }
  }

  /// 校验权限
  void _handlePermission(List<Permission> permissions) async {
    ///一个新待申请权限列表
    List<Permission> intentPermissionList = [];

    ///遍历当前权限申请列表
    for (Permission permission in permissions) {
      PermissionStatus status = await permission.status;

      ///如果不是允许状态就添加到新的申请列表中
      if (!status.isGranted) {
        intentPermissionList.add(permission);
      }
    }

    if (intentPermissionList.isEmpty) {
      _popPage(true);
    } else {
      _requestPermission(intentPermissionList);
    }
  }

  ///实际触发请求权限
  Future<void> _requestPermission(List<Permission> permissions) async {
    Log.d('_requestPermission permissions=$permissions');
    MapEntry<Permission, PermissionStatus>? statusEntry =
        await requestPermissionsInner(permissions);
    if (statusEntry == null) {
      ///都手动同意授予了
      _popPage(true);
      return;
    }

    Permission permission = statusEntry.key;
    PermissionStatus status = statusEntry.value;

    // 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 ? "前往系统设置" : "继续");
    }
    // 权限已被永久拒绝
    /// 在 Android 上：Android 11+ （API 30+）：用户是否第二次拒绝权限。低于 Android 11 （API 30）：用户是否拒绝访问请求的功能，并选择不再显示请求。
    /// 在 iOS 上：如果用户拒绝访问所请求的功能。
    if (status.isPermanentlyDenied) {
      _isGoSetting = true;
      showAlert(
          permission, msgList[2], msgList[3], _isGoSetting ? "前往系统设置" : "继续");
    }
    // isLimited：拥有部分权限（受限，仅在 iOS （iOS14+） 上受支持）
    // isRestricted：拥有部分权限，活动限制（例如，设置了家长///控件，仅在iOS以上受支持。(仅限 iOS)
    if (status.isLimited || status.isRestricted) {
      if (Platform.isIOS || Platform.isMacOS) _isGoSetting = true;
      showAlert(
          permission, msgList[1], msgList[3], _isGoSetting ? "前往系统设置" : "继续");
    }
  }

  void showAlert(Permission permission, String message, String cancelMsg,
      String confirmMsg) {
    if (_isDialogShowing) {
      // 对话框已经在显示中，不重复弹出
      Log.d("对话框已经在显示中，不重复弹出");
      return;
    }
    _isDialogShowing = true;
    showDialog(
        context: context,
        builder: (context) {
          return AlertDialog(
            title: const Text("温馨提示"),
            content: Text(message),
            actions: [
              TextButton(
                  child: Text(cancelMsg),
                  onPressed: () {
                    widget.isRequiredPermission
                        ? _quitApp()
                        : _popDialog(context, false);
                  }),
              TextButton(
                  child: Text(confirmMsg),
                  onPressed: () {
                    if (_isGoSetting) {
                      openAppSettings();
                    } else {
                      _handlePermission(widget.permissions);
                    }
                    _popDialog(context, null);
                  })
            ],
          );
        }).then((value) => {
          _isDialogShowing = false,
          _popPage(value)
        });
  }

  @override
  void dispose() {
    WidgetsBinding.instance.removeObserver(this);
    super.dispose();
  }

  /// 退出应用程序
  void _quitApp() {
    AppConfigHelper.exitApp();
  }

  /// 关闭弹窗
  /// isAllGranted为null的话跳到系统设置页
  void _popDialog(BuildContext dialogContext, bool? isAllGranted) {
    Navigator.of(dialogContext).pop();
    _popPage(isAllGranted);
  }

  /// 关闭权限申请透明页面
  /// isAllGranted 所有权限都授予，为空不关闭
  void _popPage(bool? isAllGranted) {
    if (isAllGranted != null) {
      Navigator.of(context).pop(isAllGranted);
    }
  }
}