通知：Notification

    // 創建通知
    private void createNotification() {
        // 創建通知管理者
        manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        // 創建builder實例
        builder = new Notification.Builder(MainActivity.this);

        // 設置小圖標
        builder.setSmallIcon(R.mipmap.ic_launcher);
//        builder.setContentTitle("");
//        builder.setContentText("");
        // 點擊後不會自動消失
        builder.setAutoCancel(false);
        // 不會滑動刪除通知
        builder.setOngoing(false);
        // 設置優先級
        builder.setPriority(Notification.PRIORITY_MAX);
        // 通知提示語
        builder.setTicker("notification is build!");
        // 提示音 震動 閃光 都爲系統默認
        // builder.setDefaults(Notification.DEFAULT_ALL);
        builder.setSound(Uri.parse("android.resource://" + getPackageName() + "/" + R.raw.ring));
        builder.setDefaults(Notification.DEFAULT_VIBRATE);

        // pendingIntent跳轉
        Intent intent = new Intent(MainActivity.this, MainActivity.class);
        intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
        PendingIntent pendingIntent = PendingIntent.getActivity(MainActivity.this, 0, intent, FLAG_UPDATE_CURRENT);
        builder.setContentIntent(pendingIntent);

        notification = builder.build();
        // 發起正在運行事件（活動中）
        // notification.flags = Notification.FLAG_ONGOING_EVENT;
        // 三色燈提醒
        // notification.flags = Notification.FLAG_SHOW_LIGHTS;
        // 讓聲音、振動無限循環，直到用戶響應 （取消或者打開）
        notification.flags = Notification.FLAG_INSISTENT;
        // notification.flags = Notification.FLAG_ONLY_ALERT_ONCE ;
        // 只有全部清除時，Notification纔會清除
        // notification.flags = Notification.FLAG_NO_CLEAR;

        // 自定義通知樣式
        remoteView = new RemoteViews(getPackageName(), R.layout.layout_guard_notification);
        remoteView.setTextViewText(R.id.tv_notification_num, sdf.format(System.currentTimeMillis()));
        notification.contentView = remoteView;

        manager.notify(1990, notification);
    }


刷新通知：

remoteView.setTextViewText(R.id.tv_notification_num, sdf.format(System.currentTimeMillis()));
manager.notify(1990, notification);

取消通知：二選一

manager.cancel(1990);

manager.cancelAll();

DEMO鏈接