Sample to display (head-up) notifications on Android

I want to send a notification

I want to send a notification → There are many ways → It seems stable to use NotificationCompat.Builder

First of all, the notification is not displayed → Set the icon → Notification Channel required (Android O or later only)

I want to issue a head-up notification → Not → Raise priority → Allow vibration → Various others → Notification Channel needs to be set → The settings remain until you uninstall

** It's hard because the required information is too different for each API Level **

   private void notice()
    {
        final String CHANNEL_ID = "sample_notification_channel";
        final int ID = 0;
        NotificationCompat.Builder mBuilder;

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            NotificationChannel channel = new NotificationChannel(CHANNEL_ID,"This is notificationChannel1",NotificationManager.IMPORTANCE_HIGH);
            channel.setLockscreenVisibility(Notification.VISIBILITY_PUBLIC);
            channel.enableVibration(true);

            NotificationManager manager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
            manager.createNotificationChannel(channel);
            mBuilder = new NotificationCompat.Builder(this, CHANNEL_ID);
        }else{
            mBuilder = new NotificationCompat.Builder(this);
        }

        mBuilder.setSmallIcon(R.drawable.ic_stat_name)
                        .setContentTitle("ApduService")
                        .setContentText("processCommandApdu")
                        .setColor(Color.rgb(0,255,0))
                        .setDefaults(Notification.DEFAULT_ALL)
                        .setAutoCancel(true)
                        .setWhen(System.currentTimeMillis())
                        .setPriority(Notification.PRIORITY_HIGH)
                        .setVibrate(new long[]{100, 0, 100, 0, 100, 0});

        NotificationManagerCompat manager = NotificationManagerCompat.from(this);
        manager.notify(ID, mBuilder.build());
    }
}

References

[Android] Notify Alarm with NotificationManager https://akira-watson.com/android/alarm-notificationmanager.html

I tried a little with the behavior of the notification channel of Android by changing the targetSDKVersion of the project http://woshidan.hatenablog.com/entry/2017/08/23/083000

Customize Android notifications (API21 or later) https://qiita.com/sakebook/items/8cafc0766b4f8dc95994

[Android] Customize notifications! http://www.eda-inc.jp/post-622/

Try using the Android O notification channel http://blog.techium.jp/entry/2017/09/11/090000

Solved the problem that the notification icon became white on Android 5.0 Lolipop and above https://qiita.com/syarihu/items/95788cbab9b63100c4fb

How to send a notification to the status bar with the Android app. https://qiita.com/steroid66/items/27f5ce27eb32eae49732