Android开发之Notification

        nManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        notification = new NotificationCompat.Builder(this, "12306")
                .setContentTitle("系统通知")
                .setContentText("世界这么大，好想出去走走！")
                .setSmallIcon(R.drawable.ic_baseline_person_24)
                .setLargeIcon(BitmapFactory.decodeResource(getResources(),R.drawable.a5))
                .setAutoCancel(true)
                .build();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {//Build.VERSION_CODES.O等于26
            NotificationChannel channel = new NotificationChannel("12306", "muzi",
                    NotificationManager.importANCE_HIGH);
            nManager.createNotificationChannel(channel);
        }


public void sendNotification(View view) {
        nManager.notify(1,notification);
    }