官方文档地址 permission_handler
控制台打印 提示信息的时候 可能会有两种(我遇到的)
No android specific permissions needed for: 9 可能表示 你当前申请的权限你的系统不支持 就是备注里 nothing的
No android specific permissions needed for: [ ]9 可能表示你没在 AndroidManifest 声明 .

一.插件的引用

在 pubspec.yaml 文件下新增 flutter_screenutil (注意空格问题)

dependencies:
  permission_handler: ^9.2.0

二. 配置项目

按照说明书的要求

Android 部分

1. 在 gradle.properties 中添加

android.useAndroidX=true
android.enableJetifier=true

2. 把android/app/build.gradle 改成31

android {
  compileSdkVersion 31
  ...
}

3. 在AndroidManifest.xml 添加权限 (这一步必须的 要不然就算你申请也会提示你找不到)
   还给了一份列表 按需添加

  <!--
    Internet permissions do not affect the `permission_handler` plugin, but are required if your app needs access to
    the internet.
    -->
    <uses-permission android:name="android.permission.INTERNET"/>

    <!-- Permissions options for the `contacts` group -->
    <uses-permission android:name="android.permission.READ_CONTACTS"/>
    <uses-permission android:name="android.permission.WRITE_CONTACTS"/>
    <uses-permission android:name="android.permission.GET_ACCOUNTS"/>

    <!-- Permissions options for the `storage` group -->
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

    <!-- Permissions options for the `camera` group -->
    <uses-permission android:name="android.permission.CAMERA"/>

    <!-- Permissions options for the `sms` group -->
    <uses-permission android:name="android.permission.SEND_SMS"/>
    <uses-permission android:name="android.permission.RECEIVE_SMS"/>
    <uses-permission android:name="android.permission.READ_SMS"/>
    <uses-permission android:name="android.permission.RECEIVE_WAP_PUSH"/>
    <uses-permission android:name="android.permission.RECEIVE_MMS"/>

    <!-- Permissions options for the `phone` group -->
    <uses-permission android:name="android.permission.READ_PHONE_STATE"/>
    <uses-permission android:name="android.permission.CALL_PHONE"/>
    <uses-permission android:name="android.permission.ADD_VOICEMAIL"/>
    <uses-permission android:name="android.permission.USE_SIP"/>
    <uses-permission android:name="android.permission.READ_CALL_LOG"/>
    <uses-permission android:name="android.permission.WRITE_CALL_LOG"/>
    <uses-permission android:name="android.permission.BIND_CALL_REDIRECTION_SERVICE"/>

    <!-- Permissions options for the `calendar` group -->
    <uses-permission android:name="android.permission.READ_CALENDAR" />
    <uses-permission android:name="android.permission.WRITE_CALENDAR" />

    <!-- Permissions options for the `location` group -->
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" />

    <!-- Permissions options for the `microphone` or `speech` group -->
    <uses-permission android:name="android.permission.RECORD_AUDIO" />

    <!-- Permissions options for the `sensors` group -->
    <uses-permission android:name="android.permission.BODY_SENSORS" />

    <!-- Permissions options for the `accessMediaLocation` group -->
    <uses-permission android:name="android.permission.ACCESS_MEDIA_LOCATION" />

    <!-- Permissions options for the `activityRecognition` group -->
    <uses-permission android:name="android.permission.ACTIVITY_RECOGNITION" />

    <!-- Permissions options for the `ignoreBatteryOptimizations` group -->
    <uses-permission android:name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS" />

    <!-- Permissions options for the `bluetooth` group -->
    <uses-permission android:name="android.permission.BLUETOOTH" />
    <uses-permission android:name="android.permission.BLUETOOTH_SCAN" />
    <uses-permission android:name="android.permission.BLUETOOTH_ADVERTISE" />
    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />

    <!-- Permissions options for the `manage external storage` group -->
    <uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" />

    <!-- Permissions options for the `system alert windows` group -->
    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />

    <!-- Permissions options for the `request install packages` group -->
    <uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" />

    <!-- Permissions options for the `access notification policy` group -->
    <uses-permission android:name="android.permission.ACCESS_NOTIFICATION_POLICY"/>

ios 请到官网查看不太熟悉...

三.对插件的封装

权限分两步 先查看权限是否有允许 如果不允许再去申请

查看是否有权限

权限分五类 有两类是安卓和ios都有的 ios独有的 restricted limited Android 独有的是 permanentlyDenied

  /// 检测是否有权限
  /// [permissionList] 权限申请列表
  /// [onSuccess] 全部成功
  /// [onFailed] 有一个失败
  /// [goSetting] 前往设置 插件虽然提供了一个跳转设置的方法不过也可以自定义
  static checkPermission(
      {required List<Permission> permissionList,
      VoidCallback? onSuccess,
      VoidCallback? onFailed,
      VoidCallback? goSetting}) async {
    ///一个新待申请权限列表
    List<Permission> newPermissionList = [];

    ///遍历当前权限申请列表
    for (Permission permission in permissionList) {
      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) {
        newPermissionList.add(permission);
      }
    }

    ///如果需要重新申请的列表不是空的
    if (newPermissionList.isNotEmpty) {
      PermissionStatus permissionStatus =
          await requestPermission(newPermissionList);

      switch (permissionStatus) {

        ///拒绝状态
        case PermissionStatus.denied:
          onFailed != null ? onFailed() : defaultCall("权限申请失败");
          break;

        ///允许状态
        case PermissionStatus.granted:
          onSuccess != null ? onSuccess() : defaultCall("权限申请成功");
          break;

        /// 永久拒绝  活动限制
        case PermissionStatus.restricted:
        case PermissionStatus.limited:
        case PermissionStatus.permanentlyDenied:
          goSetting != null
              ? goSetting()
              : openAppSettings();
          break;
      }
    } else {
      onSuccess != null ? onSuccess() : defaultCall("权限申请成功");
    }
  }

申请权限

  /// 获取新列表中的权限 如果有一项不合格就返回false
  static 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;
  }

还有一个需要特殊处理 ios获取checkLocationAlways 这个权限时候需要先获取 locationWhenInUse 在获取locationAlways 所以封装了以下

  static checkLocationAlways(
      {VoidCallback? onSuccess,
      VoidCallback? onFailed,
      VoidCallback? goSetting}) async {
    ///获取前置状态
    /// Android没有这一步 ios会先访问这个再访问其他的
    PermissionStatus status = PermissionStatus.granted;
      status = await _checkSinglePermission(Permission.locationWhenInUse);

    ///获取第二个状态
    PermissionStatus status2 = PermissionStatus.denied;

    ///如果前置状态为成功才能执行获取第二个状态
    if (status.isGranted) {
      status2 = await _checkSinglePermission(Permission.locationAlways);
    }

    ///如果两个都成功那么就返回成功
    if (status.isGranted && status2.isGranted) {
      onSuccess != null ? onSuccess() : defaultCall("权限申请成功");

      ///如果有一个拒绝那么就失败了
    } else if (status.isDenied || status2.isDenied) {
      onFailed != null ? onFailed() : defaultCall("权限申请失败");
    } else {
      goSetting != null ? goSetting() : await openAppSettings();
    }
  }

  static _checkSinglePermission(Permission permission) async {
    ///获取当前状态
    PermissionStatus status = await permission.status;
    PermissionStatus currentPermissionStatus = PermissionStatus.granted;

    ///如果它状态不是允许那么就去获取
    if (!status.isGranted) {
      currentPermissionStatus = await requestPermission([permission]);
    }

    ///返回最终状态
    return currentPermissionStatus;
  }

最后

一共可以申请 0-30 共三十一个权限
其中 ios 没有的有10 个 分别是 systemAlertWindow requestInstallPackages manageExternalStorage activityRecognition sms bluetoothConnect bluetoothAdvertise bluetoothScan
accessNotificationPolicy phone
android 没有的 六个
photos photosAddOnly reminders appTrackingTransparency criticalAlerts mediaLibrary
android Q 以下没有的权限 activityRecognition
所以申请的时候记得看一下 获取相册权限ios是photo Android是storage

控制台打印 提示信息的时候 可能会有两种(我遇到的)
No android specific permissions needed for: 9 可能表示 你当前申请的权限你的系统不支持 就是备注里 nothing的
No android specific permissions needed for: [ ]9 可能表示你没在 AndroidManifest 声明 .

小的demo 在 https://gitee.com/half_city/flutter_identification_photo