flutter - 尝试为相机，麦克风和抖动上的 map 写入权限

Question

尝试为相机，麦克风和 flutter 器上的 map 编写权限代码

这是代码，请这段代码有什么问题

将其保存在可访问的dart文件中

class Permissions {
  static Future<bool> cameraAndMicrophonePermissionsGranted() async {
    PermissionStatus cameraPermissionStatus = await _getCameraPermission();
    PermissionStatus microphonePermissionStatus =
        await _getMicrophonePermission();

    if (cameraPermissionStatus == PermissionStatus.granted &&
        microphonePermissionStatus == PermissionStatus.granted) {
      return true;
    } else {
      _handleInvalidPermissions(
          cameraPermissionStatus, microphonePermissionStatus);
      return false;
    }
  }

  static Future<PermissionStatus> _getCameraPermission() async {
    PermissionStatus permission =
        await PermissionHandler().checkPermissionStatus(PermissionGroup.camera);
    if (permission != PermissionStatus.granted &&
        permission != PermissionStatus.disabled) {
      Map<PermissionGroup, PermissionStatus> permissionStatus =
          await PermissionHandler()
              .requestPermissions([PermissionGroup.camera]);
      return permissionStatus[PermissionGroup.camera] ??
          PermissionStatus.unknown;
    } else {
      return permission;
    }
  }

  static Future<PermissionStatus> _getMicrophonePermission() async {
    PermissionStatus permission = await PermissionHandler()
        .checkPermissionStatus(PermissionGroup.microphone);
    if (permission != PermissionStatus.granted &&
        permission != PermissionStatus.disabled) {
      Map<PermissionGroup, PermissionStatus> permissionStatus =
          await PermissionHandler()
              .requestPermissions([PermissionGroup.microphone]);
      return permissionStatus[PermissionGroup.microphone] ??
          PermissionStatus.unknown;
    } else {
      return permission;
    }
  }

  static void _handleInvalidPermissions(
    PermissionStatus cameraPermissionStatus,
    PermissionStatus microphonePermissionStatus,
  ) {
    if (cameraPermissionStatus == PermissionStatus.denied &&
        microphonePermissionStatus == PermissionStatus.denied) {
      throw new PlatformException(
          code: "PERMISSION_DENIED",
          message: "Access to camera and microphone denied",
          details: null);
    } else if (cameraPermissionStatus == PermissionStatus.disabled &&
        microphonePermissionStatus == PermissionStatus.disabled) {
      throw new PlatformException(
          code: "PERMISSION_DISABLED",
          message: "Location data is not available on device",
          details: null);
    }
  }
}

错误是

没有在类“Permissions”中定义

方法“PermissionHandler”

未定义的名称“PermissionGroup”

在类PermissionStatus

中未定义获取方法“禁用”

名称“PermissionGroup”不是类型，因此不能用作类型参数

未定义名称“已禁用”

此代码有什么问题？

Answer 1

您的代码使用permission_handler 3.3.0在pubspec.yaml中，您必须指定3.3.0版本

dependencies:
  flutter:
    sdk: flutter
  permission_handler: 3.3.0