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Insistent ongoing notification not working on Android

I have been trying to create an incoming call type notification for my Android app, written in native Java code, and in many resources online I have read that using the .setOngoing(true) tag on the NotificationBuilder would be enough to have the desired behaviour of the notification being visible, playing the ringtone sound until it is clicked, but that has not worked for me.
I have also tried using the flags Notification.FLAG_INSISTENT and Notification.FLAG_NO_CLEAR without success.
Here is my current code:
private void ringtone(Context context){
String channelId = "call_channel";
Intent notificationIntent = new Intent(context, MainActivity.class);
PendingIntent contentIntent = PendingIntent.getActivity(context, 0, notificationIntent, PendingIntent.FLAG_IMMUTABLE);
Uri ringtoneUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_RINGTONE);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(context, channelId)
.setSmallIcon(R.drawable.ic_launcher_background)
.setContentTitle("Incoming Call")
.setContentText("You have an incoming call")
.setCategory(Notification.CATEGORY_CALL)
.setOngoing(true)
.setAutoCancel(true)
.setPriority(NotificationCompat.PRIORITY_MAX)
.setContentIntent(contentIntent);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
CharSequence channelName = "Incoming Calls";
int importance = NotificationManager.IMPORTANCE_HIGH;
NotificationChannel notificationChannel = new NotificationChannel(channelId, channelName, importance);
notificationChannel.enableVibration(true);
long[] pattern = {0, 1000, 500, 1000};
notificationChannel.setVibrationPattern(pattern);
AudioAttributes att = new AudioAttributes.Builder()
.setUsage(AudioAttributes.USAGE_NOTIFICATION_RINGTONE)
.setLegacyStreamType(AudioManager.STREAM_RING)
.setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION)
.build();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
notificationChannel.setAllowBubbles(true);
}
notificationChannel.setLockscreenVisibility(NotificationCompat.VISIBILITY_PUBLIC);
notificationChannel.setSound(ringtoneUri,att);
notificationManager.createNotificationChannel(notificationChannel);
}else{
notificationBuilder.setSound(ringtoneUri);
}
Notification notification = notificationBuilder.build();
notification.flags |= Notification.FLAG_INSISTENT | Notification.FLAG_NO_CLEAR;
NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(0, notification);
}
My intention is to have an incoming call type of notification much like other applications such as MS Teams, Whatsapp, ETC. and my issue is that the notification gets minimized after showing on screen for a few seconds, and the ringtone stops shortly after. Thank you for any help with this.

Notifications not showing

im trying to send notification to phone, but it doesnt send
imports:
import androidx.core.app.NotificationCompat;
import android.content.Context;
import android.app.NotificationManager;
my code:
public void sendNotification(){
NotificationCompat.Builder builder = new NotificationCompat.Builder(this, NotificationChannel.DEFAULT_CHANNEL_ID)
.setSmallIcon(R.mipmap.ic_launcher_round)
.setContentTitle("Title")
.setContentText("Content");
Intent notificationIntent = new Intent(this, MainActivity.class);
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);
builder.setContentIntent(contentIntent);
NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
mNotificationManager.notify(0, builder.build());
}
Why isn't it showing?
Is intent needed?
What should the channel be?
Thanks!

If you are using a Service
Starting in Android 8.0 (API level 26), all notifications must be assigned to a channel.
NotificationCompat.Builder builder = new NotificationCompat.Builder(this, 100);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel notificationChannel =
new NotificationChannel(
100,
"Media PlayBack",
NotificationManager.IMPORTANCE_LOW);
NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
if (notificationManager != null) {
notificationManager.createNotificationChannel(notificationChannel);
}
}
Intent notificationIntent = new Intent(this, MainActivity.class);
PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);
builder.setSmallIcon(R.mipmap.ic_launcher_round)
.setContentTitle("Title")
.setContentText("Content")
.setContentIntent(contentIntent);
Notification notification = builder.build();
startForeground(101, notification);

If you're using firebase to send notifications you need a firebase messaging service activity to receive the notifications. and add the data to your manifest file to receive notifications.

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

Firebase my notification not show me the recived time hour

when I receive the notifications, it comes without time, never showing me hour, find the below attached code.
This is my notification code
public void showBigNotification(String title, String message, String url, Intent intent) {
PendingIntent resultPendingIntent =
PendingIntent.getActivity(
mCtx,
ID_BIG_NOTIFICATION,
intent,
PendingIntent.FLAG_UPDATE_CURRENT
);
NotificationCompat.BigPictureStyle bigPictureStyle = new NotificationCompat.BigPictureStyle();
bigPictureStyle.setBigContentTitle(title);
bigPictureStyle.setSummaryText(Html.fromHtml(message).toString());
bigPictureStyle.bigPicture(getBitmapFromURL(url));
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(mCtx);
Notification notification;
Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
notification = mBuilder.setSmallIcon(R.mipmap.ic_launcher).setTicker(title).setWhen(0)
.setAutoCancel(true)
.setContentIntent(resultPendingIntent)
.setContentTitle(title)
.setStyle(bigPictureStyle)
.setSound(defaultSoundUri)
.setSmallIcon(R.mipmap.ic_launcher)
.setLargeIcon(BitmapFactory.decodeResource(mCtx.getResources(), R.mipmap.ic_launcher))
.setContentText(message)
.build();
notification.flags |= Notification.FLAG_AUTO_CANCEL;
NotificationManager notificationManager = (NotificationManager) mCtx.getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(ID_BIG_NOTIFICATION, notification);
}

Replace 0 with System.currentTimeMillis() in .setWhen() function.
.setWhen(System.currentTimeMillis())

Notifications Code in Android

I am trying to write a simple notification code in a button that create a notification when i press on it but the notification doesn't appear when i press on the button here is the code i am using
int notificationId = 001;
// Build intent for notification content
Intent viewIntent = new Intent(SessionsActivity.this, MainActivity.class);
PendingIntent viewPendingIntent =
PendingIntent.getActivity(SessionsActivity.this, 0, viewIntent, 0);
NotificationCompat.Builder notificationBuilder =
new NotificationCompat.Builder(SessionsActivity.this)
.setContentTitle("hii")
.setContentText("hii2")
.setContentIntent(viewPendingIntent);
// Get an instance of the NotificationManager service
NotificationManagerCompat notificationManager =NotificationManagerCompat.from(SessionsActivity.this);
// Build the notification and issues it with notification manager.
notificationManager.notify(notificationId, notificationBuilder.build());

Intent viewIntent = new Intent(SessionsActivity.this, MainActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, viewIntent , PendingIntent.FLAG_UPDATE_CURRENT);
Uri defaultSoundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.ic_launcher)
.setContentTitle(getResources().getString(R.string.app_name))
.setAutoCancel(true)
.setSound(defaultSoundUri)
.setContentIntent(pendingIntent);
NotificationCompat.InboxStyle inboxStyle = new NotificationCompat.InboxStyle();
notificationBuilder.setStyle(inboxStyle);
inboxStyle.setBigContentTitle("sdjshfjnds");
inboxStyle.addLine("sdjjsdfn");
notificationBuilder.setStyle(inboxStyle);
NotificationManager notificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
int NOTIFICATION_ID = 100;
notificationManager.notify(NOTIFICATION_ID, notificationBuilder.build());