在我们的项目中，我们使用Permission.RequestUserPermission方法。我们要求android.permission.POST_NOTIFICATIONS权限。在此之后，我们创建通知通道。
这是一个代码示例：

private static int GetApiLevel()
{
    using var version = new AndroidJavaClass("android.os.Build$VERSION");
    return version.GetStatic<int>("SDK_INT");
}

...
var apiLevel = GetApiLevel();
Debug.Log($"Android API level = {apiLevel}");
if (apiLevel > 32)
{
    // for API level > 32 requesting permissions works well.
    // for API level <= 32 it does nothing and always fails.
    ... Request permission ...
}

...
// Then we create or obtain notification chanell to push notifications.
var existingChannel = AndroidNotificationCenter.GetNotificationChannel(ChannelId);
if (existingChannel.Id == ChannelId)
{
    _channelInitialized = existingChannel.Enabled;
    return;
}

// Create new channel
var channel = new AndroidNotificationChannel()
{
    Id = ChannelId,
    Name = "SomeName",
    Importance = Importance.Default,
    Description = "Generic notifications",
    CanShowBadge = true,
    EnableVibration = true,
    LockScreenVisibility = LockScreenVisibility.Public
};
Debug.Log("Notifications channel initialization");
AndroidNotificationCenter.RegisterNotificationChannel(channel);
var c = AndroidNotificationCenter.GetNotificationChannel(ChannelId);
Debug.Log($"Channel enabled = {c.Enabled}");
_channelInitialized = c.Enabled;
...

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最后我用这段代码做到了：

void askRequst()//call this function to ask request
 {
     if (Permission.HasUserAuthorizedPermission("android.permission.POST_NOTIFICATIONS"))
     {
         print("permission granted!!");
     }
     else
     {
         var callbacks = new PermissionCallbacks();
         callbacks.PermissionDenied += PermissionCallbacks_PermissionDenied;
         callbacks.PermissionGranted += PermissionCallbacks_PermissionGranted;
         callbacks.PermissionDeniedAndDontAskAgain += PermissionCallbacks_PermissionDeniedAndDontAskAgain;
         Permission.RequestUserPermission("android.permission.POST_NOTIFICATIONS", callbacks);
     }

 }
 internal void PermissionCallbacks_PermissionDeniedAndDontAskAgain(string permissionName)
 {
     Debug.Log($"{permissionName} PermissionDeniedAndDontAskAgain");
 }

 internal void PermissionCallbacks_PermissionGranted(string permissionName)
 {
     Debug.Log($"{permissionName} PermissionCallbacks_PermissionGranted");
 }

 internal void PermissionCallbacks_PermissionDenied(string permissionName)
 {
     Debug.Log($"{permissionName} PermissionCallbacks_PermissionDenied");
 }

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就像这样，我可以要求任何android许可：-）