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Java android: pushing notification won't work

When i run this on my android app to try and get a notification with the command: sendNotification("test","title",1);
i get an error: E/NotificationManager: notifyAsUser: tag=null, id=1, user=UserHandle{0}
private void sendNotification(String message, String title, int id) {
Intent intent = new Intent(this, Game.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */,
intent, PendingIntent.FLAG_ONE_SHOT);
Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.maintitle)
.setContentTitle(title)
.setContentText(message)
.setAutoCancel(true)
.setSound(defaultSoundUri)
.setContentIntent(pendingIntent);
NotificationManager notificationManager =
(NotificationManager) getSystemService(this.NOTIFICATION_SERVICE);
notificationManager.notify(id /* ID of notification */,
notificationBuilder.build());
}

You must set Channel id for new android versions.
Create your notification this way
private final static String CHANNEL_ID = "my_notification";
private void sendNotification(String message, String title, int id) {
Intent intent = new Intent(this, Game.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */,
intent, PendingIntent.FLAG_ONE_SHOT);
Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this, CHANNEL_ID)
.setSmallIcon(R.drawable.maintitle)
.setContentTitle(title)
.setContentText(message)
.setAutoCancel(true)
.setSound(defaultSoundUri)
.setContentIntent(pendingIntent);
NotificationManager notificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
NotificationChannel channel = new NotificationChannel(CHANNEL_ID, "news_notification", NotificationManager.IMPORTANCE_DEFAULT);
notificationManager.createNotificationChannel(channel);
}
notificationManager.notify(id /* ID of notification */,
notificationBuilder.build());
}
Set CHANNEL_ID in NotificationCompat.Builder and create channel

Failed to post notification on channel “null” Target Api is 27

After upgrading my app target api to 27 notification is no more working and i get a toast message on android studio emulator:
Failed to post notification on channel “null”
Here is my notification code:
private void sendNotification(Context context, String sysModel) {
Intent intentAction = new Intent(context, MainActivity.class);
intentAction.putExtra("sysModel", sysModel);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 1, intentAction, PendingIntent.FLAG_ONE_SHOT);
notificationBuilder = new NotificationCompat.Builder(context)
.setSmallIcon(R.drawable.changer_ico)
.setContentTitle(context.getString(R.string.service_ready))
.setContentIntent(pendingIntent)
.addAction(R.drawable.ic_key_black_24dp, context.getString(R.string.turn_on), pendingIntent)
.setAutoCancel(true);
Notification notification = notificationBuilder.build();
notificationManager.notify(1903, notification);
}

Can you test the code below?
Note that new NotificationCompat.Builder(context, NOTIFICATION_CHANNEL); instead of new NotificationCompat.Builder(context);
private final static String NOTIFICATION_CHANNEL = "channel_name";
private final static String CHANNEL_DESCRIPTION = "channel_description";
public final static int NOTIFICATION_ID = 1903;
private void sendNotification(Context context, String sysModel) {
// Intent
Intent intentAction = new Intent(context, MainActivity.class);
intentAction.putExtra("sysModel", sysModel);
// Pending Intent
PendingIntent pendingIntent = PendingIntent.getActivity(context, 1, intentAction, PendingIntent.FLAG_ONE_SHOT);
// Notification Manager
NotificationManager notificationManager = (NotificationManager) context.getSystemService(Service.NOTIFICATION_SERVICE);
// Create the notification channel if android >= 8
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
NotificationChannel channel = new NotificationChannel(NOTIFICATION_CHANNEL, CHANNEL_DESCRIPTION, NotificationManager.IMPORTANCE_DEFAULT);
notificationManager.createNotificationChannel(channel);
}
// Notification builder.. Note that I added the notification channel on this constructor
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(context, NOTIFICATION_CHANNEL);
notificationBuilder.setSmallIcon(R.drawable.changer_ico)
notificationBuilder.setContentTitle(context.getString(R.string.service_ready))
notificationBuilder.setContentIntent(pendingIntent)
notificationBuilder.addAction(R.drawable.ic_key_black_24dp, context.getString(R.string.turn_on), pendingIntent)
notificationBuilder.setAutoCancel(true);
// Notify
notificationManager.notify(NOTIFICATION_ID, notificationBuilder.build());
}

In android O you should dispatch notice like follow:
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(context)
.setSmallIcon(R.drawable.changer_ico)
.setContentTitle(context.getString(R.string.service_ready))
.setContentIntent(pendingIntent)
.addAction(R.drawable.ic_key_black_24dp, context.getString(R.string.turn_on), pendingIntent)
.setAutoCancel(true);
Notification notification = notificationBuilder.build();
NotificationChannel channel = new NotificationChannel("1903",
context.getString(R.string.user_notify), NotificationManager.IMPORTANCE_DEFAULT);
notificationManager.createNotificationChannel(channel);
notificationManager.notify(1903, notification);

Start an Activity when clicking a notification

I'm trying to start an activity by clicking on a notification but that only works when I'm already in the app.
Here's the code I think has to do with it:
private void sendNotification(String body) {
Intent intent = new Intent(ImpFirebaseMessagingService.this, codeActivity.class);
intent.putExtra("body", body);
intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_ONE_SHOT);
Uri notificationSound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle("Implementation TFA")
.setContentText(body)
.setAutoCancel(true)
.setSound(notificationSound)
.setContentIntent(pendingIntent);
NotificationManager notificationManager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(0, notificationBuilder.build());
}

The following works in my app:
private void sendReminderNotification(Context context) {
Resources resources = context.getResources();
Intent notificationIntent = new Intent(context, TitleActivity.class);
PendingIntent contentIntent = PendingIntent.getActivity(context, 0, notificationIntent,
PendingIntent.FLAG_UPDATE_CURRENT);
NotificationCompat.Builder builder =
new NotificationCompat.Builder(context)
.setSmallIcon(android.R.drawable.ic_lock_idle_alarm)
.setLargeIcon(BitmapFactory.decodeResource(resources, R.drawable.my_diary_launcher_icon))
.setContentTitle("MyDiary")
.setContentText("Reminder to input entry.")
.setDefaults(Notification.DEFAULT_ALL)
.setAutoCancel(true)
.setPriority(NotificationCompat.PRIORITY_MAX)
.setContentIntent(contentIntent);
// Add as notification
NotificationManager manager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
manager.notify(NOTIFICATION_ID, builder.build());
}

Use pendingIntent to pass data of intent:
private void sendReminderNotification(Context context) {
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle("Implementation TFA")
.setContentText(body)
.setAutoCancel(true)
.setSound(notificationSound);
Intent intent = new Intent(ImpFirebaseMessagingService.this, codeActivity.class);
intent.putExtra("body", body);
intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent,PendingIntent.FLAG_UPDATE_CURRENT);
notificationBuilder.setContentIntent(pendingIntent);
NotificationManager notificationManager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(0, notificationBuilder.build());
}

How to make notification dissapear after click

I want to make a notification disappear after a click, I don't want to go to new Activity. This is how I build a notification :
public static void getSynchronizeNotification(Context context, DataResponse dataResponse){
Bitmap Largeicon = BitmapFactory.decodeResource(context.getResources(), R.drawable.ic_launcher);
NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.cancel(NOTIFICATION_SYNCHRONIZE_ID);
Intent in = new Intent(String.valueOf(context));
Intent intent = new Intent(context, MainActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, in, 0);
Notification notification = new Notification.Builder(context)
.setContentTitle(context.getString(R.string.app_name))
.setSmallIcon(R.drawable.ic_launcher)
.setContentIntent(pendingIntent)
.setContentText("Zmiany po synchronizacji...")
.setStyle(new Notification.BigTextStyle().bigText(buildNotificationAfterSynchronizeText(dataResponse)))
.setLargeIcon(Largeicon)
.setAutoCancel(true)
.setVibrate(vibratePattern)
.setSound(alarmSound)
.setPriority(Notification.PRIORITY_MAX)
.build();
notification.flags = Notification.DEFAULT_LIGHTS | Notification.FLAG_AUTO_CANCEL;
notificationManager.notify(NOTIFICATION_SYNCHRONIZE_ID, notification);
}

I change this :
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, in, 0);
to
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, new Intent(), 0);
and it works

make notification clickable and undestroyable

I tried to create a notification that starts a activity by clicking on it and which you can't swipe away.
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(this)
.setLargeIcon(BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher))
.setSmallIcon(R.drawable.ic_launcher)
.setContentTitle("DroidSchool")
.setContentText("DroidSchool l\u00E4uft im Hintergrund...");
Intent intent = new Intent(this, MainActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, Intent.FLAG_FROM_BACKGROUND);
NotificationManager mNotificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
int mId = 1234567890;
mNotificationManager.notify(mId, mBuilder.build());
with the code above the notification gets displayed, but nothing happens when I click on it and you can swipe it away.

To keep the Notification, in that way the user can't click it away in any way, add this flag
Notification mNotification = mBuilder.build();
notification.flags = Notification.FLAG_NO_CLEAR;
mNotificationManager.notify(mId, notification);
To start an Activity you have to use this flag for your Intent
Intent intent = new Intent(this, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, 0);

Do like this:
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(this)
.setLargeIcon(BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher))
.setSmallIcon(R.drawable.ic_launcher)
.setContentTitle("DroidSchool")
.setContentText("DroidSchool l\u00E4uft im Hintergrund...");
Intent intent = new Intent(YourActivity.this, MainActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, 0);
Notification noti = mBuilder.build();
noti.flags |= mBuilder.build().FLAG_NO_CLEAR | mBuilder.build().FLAG_ONGOING_EVENT;
NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
manager.notify(0, noti);

You want a foreground service as detailed here
It's worth noting that only android 4.3 added the persistent notification you seem to be after and it can be overriden by the users settings.

try using like this
Intent intent = new Intent(this, MainActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, Intent.FLAG_UPDATE_CURRENT);
in MainActivity.java
Dont not consume your notification; ie instead of calling below 2 line code in oncreate() call under onDestro()
NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
nm.cancel(mId);

You can use NotificationCompat.Builder's .setOngoing(true), use it like this:
NotificationCompat.Builder builder = new NotificationCompat.Builder(context)
.setAutoCancel(true)
.setContentTitle("Downloading Something")
.setContentText("Downloading")
.setSound(null)
.setDefaults(0)
.setOngoing(true);
// Makes it so the notification is clickable but not destroyable by swiping-away or hitting "clear all"