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how to make heads-up notifications in android studio?

As I've searched how to reveal heads-up, I found a solution that is to set priority high but it still doesn't show heads-ups. I've got a notfication massenger service. Its function is as below. Is there anything I missed in settings?
Heading
mycode:
private void sendNotification(String body, String title) {
NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
remoteViews = new RemoteViews(getPackageName(), R.layout.custom_notification);
remoteViews.setTextViewText(R.id.title, "Firebase");
remoteViews.setTextViewText(R.id.body, body);
remoteViews.setImageViewResource(R.id.icon, R.mipmap.ic_launcher);
Intent intent = new Intent(this, MainActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP|Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT);
PendingIntent pendingIntent = PendingIntent.getActivities(this, 0, new Intent[]{intent}, PendingIntent.FLAG_ONE_SHOT);
Uri notificationSound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder notifBuilder = new NotificationCompat.Builder(this)
.setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
.setSmallIcon(R.mipmap.ic_launcher)
.setCustomContentView(remoteViews)
.setLargeIcon(BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher))
.setPriority(NotificationCompat.PRIORITY_MAX)
.setContentTitle("Firebase Cloud Messaging")
.setContentText(body)
.setCustomHeadsUpContentView(remoteViews)
.setAutoCancel(false)
.setDefaults(Notification.DEFAULT_ALL)
.setTicker(body)
.setSound(notificationSound)
.setFullScreenIntent(pendingIntent, true)
.setContentIntent(pendingIntent);
notificationManager.notify(0, notifBuilder.build());
}

Try replacing .setContentIntent(pendingIntent) with .setFullScreenIntent(pendingIntent, true) in your Notification Builder.

push Notification in android with android studio

I do the next for call a Notification on android studio
when I send a message out of the app, only show the Icon and the text, but does not play sound or vibration
when I am inside the app, play sound and vibrate.
Any help?
I have on manifest
Method for show notification:
Intent intent = new Intent(this, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent,
PendingIntent.FLAG_ONE_SHOT);
//Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
Uri defaultSoundUri = Uri.parse("android.resource://"+this.getPackageName()+"/"+R.raw.power);
//Uri alarmSound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
Notification.Builder notificationBuilder = new Notification.Builder(this)
.setSmallIcon(R.mipmap.colantaico)
.setContentTitle(Titulo)
.setContentText(messageBody)
.setAutoCancel(true)
.setSound(defaultSoundUri)
.setVibrate(new long[] { 1000, 1000, 1000, 1000, 1000 })
.setLights(Color.RED, 3000, 3000)
.setContentIntent(pendingIntent);
Notification mNotification = notificationBuilder.build();
mNotification.flags |= Notification.FLAG_INSISTENT;
mNotification.sound = defaultSoundUri;
NotificationManager notificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(0 /* ID of notification */, mNotification);
In the Manifest
<uses-permission android:name="android.permission.VIBRATE" />
<service
android:name=".RecibidorNotificacionesFCM">
<intent-filter>
<action android:name="com.google.firebase.MESSAGING_EVENT"/>
</intent-filter>
</service>

private static final int NOTIFICATION_ID = 1;
Intent openIntent = new Intent(this, MainActivity.class);;
PendingIntent contentIntent = PendingIntent.getActivity(this, NOTIFICATION_ID,
openIntent, PendingIntent.FLAG_ONE_SHOT);
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(this)
.setDefaults(Notification.DEFAULT_ALL)
.setVibrate(new long[]{100, 250, 100, 250, 100, 250})
.setAutoCancel(true)
.setColor(this.getResources().getColor(R.color.activity_toolbar_color))
.setContentTitle("Test Notification")
.setStyle(new NotificationCompat.BigTextStyle()
.bigText(Html.fromHtml("Notification text")))
.setPriority(Notification.PRIORITY_MAX)
.setContentText(Html.fromHtml("Notification text")))
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
mBuilder.setSmallIcon(R.drawable.notification_icon1);
} else {
mBuilder.setSmallIcon(R.drawable.notification_icon);
}
mBuilder.setContentIntent(contentIntent);
mBuilder.setDeleteIntent(LocalNotificationEventReceiver.getDeleteIntent(this));
NotificationManager notificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
Notification notification = mBuilder.build();
notificationManager.notify(NOTIFICATION_ID, notification);

With multiple notifications second notification showing in collapse mode Android

I'm showing multiple notifications in my android application.
When there is single notification it is showing correctly.
But when I generate second notification, second notification showing in collapse by default.
If I manually expand second notification it is showing as:
I want to show a notifications in expanded mode by default.
Here is my code:
int num = (int) System.currentTimeMillis();
PendingIntent pendingIntent = PendingIntent.getActivity(this, num /* Request code */, intent,
PendingIntent.FLAG_ONE_SHOT);
NotificationCompat.BigTextStyle bigTextStyle = new NotificationCompat.BigTextStyle();
bigTextStyle.setBigContentTitle(title);
bigTextStyle.bigText(messageBody);
Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.corco)
.setAutoCancel(true)
.setSound(defaultSoundUri)
.setStyle(bigTextStyle)
.setContentIntent(pendingIntent);
NotificationManager notificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(num /* ID of notification */, notificationBuilder.build());
Am i missing something? or doing something wrong?
Thanks in advance.

I resolved it. I was not setting any ContentTitle and ContentText for collapse notification.
Here is my updated code:
int num = (int) System.currentTimeMillis();
PendingIntent pendingIntent = PendingIntent.getActivity(this, num /* Request code */, intent,
PendingIntent.FLAG_ONE_SHOT);
NotificationCompat.BigTextStyle bigTextStyle = new NotificationCompat.BigTextStyle();
bigTextStyle.setBigContentTitle(title);
bigTextStyle.bigText(messageBody);
Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.corco)
.setAutoCancel(true)
.setSound(defaultSoundUri)
.setStyle(bigTextStyle)
.setContentTitle(title)
.setContentText(messageBody)
.setContentIntent(pendingIntent);
NotificationManager notificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(num /* ID of notification */, notificationBuilder.build());

Android push notification showing text in single line

I have search and found solution but that solution is not showing multi line push notification.
My code is below,
int id = (int) System.currentTimeMillis();
Intent intent = new Intent(this, Activity.class);
Bundle bundle = new Bundle();
bundle.putString("id", u_id);
intent.putExtras(bundle);
PendingIntent resultPendingIntent =
PendingIntent.getActivity(
this,
0,
intent,
PendingIntent.FLAG_CANCEL_CURRENT
);
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(
this);
Notification notification = mBuilder.setSmallIcon(getNotificationIcon()).setTicker(getResources().getString(R.string.app_name)).setWhen(0)
.setAutoCancel(true)
.setContentTitle(getResources().getString(R.string.app_name))
.setStyle(new NotificationCompat.BigTextStyle().bigText(messageBody))
.setContentIntent(resultPendingIntent)
.setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION))
.setLargeIcon(BitmapFactory.decodeResource(getResources(), getNotificationIcon()))
.setContentText(messageBody).build();
NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(id, notification);
How can I show multi line text in push notification?

Intent intent = new Intent(this, target.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent,
PendingIntent.FLAG_ONE_SHOT);
Bitmap image= BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher);
Uri defaultSoundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.youricon)
.setContentTitle("Title")
.setLargeIcon(image)
.setContentText("Message")
.setAutoCancel(true)
.setSound(defaultSoundUri)
.setContentIntent(pendingIntent)
.setStyle(new NotificationCompat.BigPictureStyle().bigPicture(bitmap).setSummaryText("multiline text"));
NotificationManager notificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(m/* ID of notification */, notificationBuilder.build());

Not getting any sound or vibration on notification

When the notification is received I dont get the sound and the vibration. For information phone is not in mute mode.
NotificationCompat.Builder builder = new NotificationCompat.Builder(this)
.setAutoCancel(true)
.setContentText(message)
.setSmallIcon(R.drawable.common_google_signin_btn_icon_dark)
.setContentIntent(pendingIntent);
long[] pattern = {500,500,500};
builder.setVibrate(pattern);
Uri alarmSound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
builder.setSound(alarmSound);
NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
manager.notify(0,builder.build());