Android（三十一）：Notification 状态栏通知

var btn01 = (Button)FindViewById(Resource.Id.btn_01);
var btn02 = (Button)FindViewById(Resource.Id.btn_02);
var largeBitmap = BitmapFactory.DecodeResource(Resources, Resource.Drawable.avatar);
var notificationManager = (NotificationManager)GetSystemService(NotificationService);

if (btn01 != null)
    btn01.Click += (sender, args) =>
    {
        Notification notification;
        const string id = "ChannelId";
        if (Build.VERSION.SdkInt >= BuildVersionCodes.O)
        {
            // id：          每个包必须是唯一的,太长,可能会被截断
            // name：        用户可见名称,最大建议长度为40个字符,太长可能会被截断
            // importance：  重要性
            var notificationChannel = new NotificationChannel(id, "name", Notificationimportance.High);
            notificationManager?.CreateNotificationChannel(notificationChannel);
            notification = new Notification.Builder(this)
                .SetChannelId(id)
                .SetContentTitle("SetContentTitle")
                .SetContentText("SetContentText")
                .SetSubText("SetSubText")
                .SetTicker("SetTicker")
                .SetWhen(JavaSystem.CurrentTimeMillis()) // 设置通知时间
                .SetSmallIcon(Resource.Drawable.small_icon) // 小图标
                .SetLargeIcon(largeBitmap) // 大图标
                .SetAutoCancel(false) // 用户点击Notification点击面板后是否让通知取消(默认不取消)
                .SetDefaults(NotificationDefaults.All)
                ?.Build();
        }
        else
        {
            notification = new NotificationCompat.Builder(this)
                .SetContentTitle("SetContentTitle")
                .SetContentText("SetContentText")
                .SetSubText("SetSubText")
                .SetTicker("SetTicker")
                .SetWhen(JavaSystem.CurrentTimeMillis()) // 设置通知时间
                .SetSmallIcon(Resource.Drawable.small_icon) // 小图标
                .SetLargeIcon(largeBitmap) // 大图标
                .SetAutoCancel(false) // 用户点击Notification点击面板后是否让通知取消(默认不取消)
                .SetDefaults((int)NotificationDefaults.Sound)
                .Build();
        }

        notificationManager?.Notify(1, notification);
    };

if (btn02 != null)
    btn02.Click += (sender, args) => notificationManager?.Cancel(1);