Develop Reference

Push notification android basic questions

I am about it implement push notification from a node.js-server into my Android/kotlin-app.
Therefore i have used pusher.com which was very easy to implement for basic notifications
But: I want to create more costumizable notification, like a large image etc.
All the samples I find is about how to create a notification in Android.
e.g. this works great:
notificationManager = NotificationManagerCompat.from(this);
val largeIcon = BitmapFactory.decodeResource(resources, R.drawable.large)
val activityIntent = Intent(this, MainActivity::class.java)
val contentIntent = PendingIntent.getActivity(this, 0, activityIntent, 0)
val notification: Notification = NotificationCompat.Builder(this, App.CHANNEL_1_ID)
.setContentText("test")
.setContentTitle("test")
.setSmallIcon(R.drawable.heizungan)
.setPriority(NotificationCompat.PRIORITY_HIGH)
.setLargeIcon(largeIcon)
.setCategory(NotificationCompat.CATEGORY_MESSAGE)
.setStyle(NotificationCompat.BigTextStyle()
.bigText("test")
.setBigContentTitle("test")
.setSummaryText("Heizung"))
.setPriority(NotificationCompat.PRIORITY_HIGH)
.setCategory(NotificationCompat.CATEGORY_MESSAGE)
.setColor(Color.RED)
.setContentIntent(contentIntent)
.setAutoCancel(true)
.setOnlyAlertOnce(true)
.build()
notificationManager!!.notify(1, notification)
Using this in my app, i can create and show this notification.
But how do I push this?
How can I push some values to my device and then show this notification?
Thanks

You would need a cloud service to actually send the notification to your device.
An example would be Firebase Cloud Messaging

As milhamj has already said you can use Firebase Cloud Messaging
How to do this... (click)
Find my answer for android service
On this link you have php code on backend that you can rewrite in javascript or check this link for nodejs
and java code for Android app (MyFirebaseMessagingService)

How to prevent Android notifications from overwriting themselves?

I am using XMPP (smack) to create a messaging application and I am sending notifications whenever I receive a new message. The problem is that if I receive messages from two different users I can only see the last notification. How can I change it? Here is my code.
Intent thisIntent = new Intent(mApplicationContext, ChatActivity.class);
thisIntent.putExtra("EXTRA_CONTACT_JID",contactJid);
PendingIntent contentIntent = PendingIntent.getActivity(mApplicationContext, 0, thisIntent, PendingIntent.FLAG_UPDATE_CURRENT);
NotificationCompat.Builder b = new NotificationCompat.Builder(mApplicationContext);
b.setAutoCancel(true)
.setDefaults(Notification.DEFAULT_ALL)
.setWhen(System.currentTimeMillis())
.setSmallIcon(R.drawable.fab_bg_mini)
.setTicker("Hearty365")
.setContentTitle("New message")
.setContentText(" You received a new message from " + contactJid)
.setContentIntent(contentIntent)
.setContentInfo("Info");
if(!ChatActivity.active){
b.setDefaults(Notification.DEFAULT_LIGHTS| Notification.DEFAULT_SOUND);
}
NotificationManager notificationManager = (NotificationManager) mApplicationContext.getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(1, b.build());
And as you can see I put an extra contactJid which is important to me. I need to set it in such a way that if a user clicks one notification its contactJid will be this and if another its contactJid will be another.

notificationManager.notify(1, b.build()); is your problem - you need to supply a unique identifier for this notification, as per the documentation:
If a notification with the same id has already been posted by your application and has not yet been canceled, it will be replaced by the updated information.
You are supplying the constant 1 for each notification, instead of a unique ID. I'd suggest using a hash of the contact JID (which I assume is a string):
notificationManager.notify(contactJid.hashCode(), b.build());

Android display multiple messages in a single notification

Currently, I receive notifications from a server. What happens is, if I get a notification, I dont see it for long time. When a new notification comes, I lose the previous one. I want a single notification with multiple messages something like this -

It is InboxStyle notification
Notification notif = new Notification.Builder(mContext)
.setContentTitle("5 New mails from " + sender.toString())
.setContentText(subject)
.setSmallIcon(R.drawable.new_mail)
.setLargeIcon(aBitmap)
.setStyle(new Notification.InboxStyle()
.addLine(str1)
.addLine(str2)
.setContentTitle("")
.setSummaryText("+3 more"))
.build();
Here is official document
check this example also - Inbox Style Notification Like Whatsapp

how to send images in push notifications (GCM) android?

I am new to push notifications concept. So i am learning about push notifications. How we get multi-line text in push notifications.
Recently i saw images in push notifications too. how we get that type of push notifications in android. Please any one suggest me or provide links. Thank you in advance.
I tried but not getting multi line notification. This is not working for older versions .
Code:
PendingIntent p= PendingIntent.getActivity(context, 3456, in, PendingIntent.FLAG_UPDATE_CURRENT);
NotificationCompat.Builder b=new NotificationCompat.Builder(context);
b.setAutoCancel(true)
.setDefaults(Notification.DEFAULT_ALL)
.setWhen(System.currentTimeMillis())
.setSmallIcon(R.drawable.reload_logo)
.setTicker("Post Paid bill")
.setContentTitle("Reload.in")
.setStyle(new NotificationCompat.BigTextStyle().bigText(message))
//.setContentText("Rs.has to be paidjhgfhdjgf dhfhh hfdufgjhbj fhgjfg bfdjgjfg jfjb ndjfd d vdgfvhdgf")
.setDefaults(Notification.DEFAULT_LIGHTS | Notification.DEFAULT_SOUND)
.setContentIntent(p)
.setContentInfo("Info")
.setContentText(message).build();
NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(1, b.build());

For showing multiple text in notification you can use below code.
For Jelly Bean and higher you can use an expandable notification. The easiest way is to use the NotificationCompat.BigTextStyle for your notification.Use below code.
NotificationCompat.BigTextStyle bigTextStyle = new NotificationCompat.BigTextStyle();
bigTextStyle.setBigContentTitle(getString(R.string.title));
bigTextStyle.bigText(getString(R.string.long_explanation));
mBuilder.setStyle(bigTextStyle);
You can not send images in Push notifications. There is data limit you can send in push notification.
Android
The message size limit in GCM is 4 kbytes.
https://developer.android.com/google/gcm/server.html#params
Instead of that you have to send Url of image in server then on Receiver side at time of receiving push notification you have fetch image from server and then you have to display image in notification.
EDIT
For showing large image in notification refer this.

On your server side; In the message body you can send key value data.For multiline text use long notification to show the message. https://developer.android.com/guide/topics/ui/notifiers/notifications.htmlFor image you need to ask for a url from service and fetch that image and show accordingly.http://developer.android.com/reference/android/app/Notification.BigPictureStyle.html

How to make push notification without internet

me and my colleague are trying to show "push notification" message in mobile device. Colleague is telling that it can´t be done without Google Cloud Messaging but I think - why use any server for that?
We want something like this:
How our application will work is:
- user has app on background
- ajax request is made (request to our server)
- server response is: You have 1 new message
- message is showed in top strip on mobile.
Of course, the message can be showed without internet.. My GF had mobile app "Pou"... when he pooped notification was displayed... Just I dont get it why to use any Google service for that?
Can somebody direct me pls?

You should use Notification to show "push notification".
private void showNotification() {
Intent notificationIntent = new Intent(this, MainActivity.class);
NotificationCompat.Builder builder = new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.ic_launcher)
.setAutoCancel(true)
.setTicker(getString(R.string.notification_ticker_text))
.setContentText(getString(R.string.notification_content_text))
.setContentIntent(PendingIntent.getActivity(this, 0, notificationIntent, 0))
.setWhen(System.currentTimeMillis())
.setContentTitle(getString(R.string.app_name))
.setDefaults(Notification.DEFAULT_ALL);
Notification notification = builder.build();
((NotificationManager) this.getSystemService(NOTIFICATION_SERVICE)).notify(0, notification);
}