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Retrieve message from a notification push

This push notification is used to notify when a new chat message is available. I want to do like Instagram, that is to say, the message into this notification is updated at each new income message received, until the user open the chat.
So, how can I retrieve the message for this specific notification? Is it possible, or I have to save (in cache) the latest messages... ?
Thank you very much

I suggest saving messages in the database, and then in the function that sends notifications, get messages (probably recent unread ones - I don't know what your logic looks like in this case).
If there are more than one, use InboxStyle():
val otherMessagesToShow = getMostRecentUnreadMessages()
if(otherMessagesToShow.size > 1) {
val style = NotificationCompat.InboxStyle()
otherMessagesToShow.forEach { style.addLine(it) }
builder.setStyle(style)
builder.setNumber(otherMessagesToShow.size)
}
Finally, update the existing one (passing the same notificationID):
notificationManager.notify(notificationId, builder.build())

Android notification append content on update

I have made an android app (Android Studio / Java) that checks a website for content and stores it in an sqlite DB. If new content is fetched that is not stored in DB, it shows a notification with the new content for user to notice.
That's working fine, although if user does not read/open/dismiss that notification, the next notification will update current one and replace its content with new data. This is wanted behavior, because I don't want the user to receive many notifications for the same thing, so I'm using the same notification id.
This introduces a problem though, if user checks the notification now, he will see the second fetched data, but won't be aware of the existence of the first fetched data.
So, what I'm trying to do is to append to the notification's content, so that both first and second fetched data are shown.
I tried the "inboxStyle" notifications that allow for new lines to be added, but it seems to be working only for setting many lines at the time notification is created and not for appending lines to an existing notifications.
I know that I can do that by storing what user has seen and what not, whether a notification was opened, etc, but this seems too much hassle for a simple thing, there must be an easier way to achieve it.
The expected behavior would be to either be able to append the message of existing notifications, or be able to fetch the message of an existing notification (by id) and then manually append to it and push the updated notification.
If that's not clear enough, the expected outcome is:
Issue the first notification with message "Test message 1"
Issue second notification using the same notification-id with message "Test message 2" that would NOT overwrite "Test message 1" but rather keep that message and append to it, so that the notification's message would now be "Test message 1 {newline-here} Test message 2" (or even better reversed so that the last message is shown on top).
Thank you in advance!

I was looking for a solution myself. I managed to do something that works but I'm quite sure there are other elegant solutions : I'm checking whether or not similar notification has been displayed. If so, I get the previous content and append it to the new notification content before publishing.
First, make sure that the notifications you want to assemble have the same uniqueID
This way, when you receive your 2nd, 3rd notification, you can easily match the one you are creating with the ones already displayed.
Note : This code works only on API 23 and higher.
String message = null;
if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
StatusBarNotification[] notifications = mNotificationManager.getActiveNotifications();
for (StatusBarNotification notification: notifications) {
if (notification.getId() == uniqueID) {
// You have a match
Bundle extras = notification.getNotification().extras;
message = extras.getCharSequence(Notification.EXTRA_TEXT).toString();
break;
}
}
}
The easy part : Now that you have the previous notification text, you have to append it to the new notification text before publishing
String newMessage = message + remoteMessage.getData.get("text");
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(getApplicationContext(),
channelID)
.setStyle(new NotificationCompat.BigTextStyle().bigText(newMessage))
.setContentTitle("Title")
.setContentText(notification.getMessage())
.setAutoCancel(true);

Creating a local notification in response to a push notification (from firebase) in cordova/ionic

I'm building an application using Ionic Framework that implements a chat function similar to good-old facebook messenger, in that i want to notify users of a chat message, but if they view it elsewhere, i want to remove the notification from their home screen.
I'm using firebase as a back-end for push notifications (though that could be changed i suppose).
I know that you can't expire a remote notification, but i've been told you can expire + remove a local notification, so my question is - can i reliably receive a remote notification, create a local one, and display that, and then in response to a notification with a scope of 'expire' or 'remove', delete a local notification so that my users don't see a duplication of information?
Most plugins tend to detect the status of the app and add a remote notification to the homescreen with the info you've pushed by default, is there a way to avoid this?
Thanks guys.
EDIT:
- Local notifications: http://ionicframework.com/docs/native/local-notifications/
- Firebase cloud messaging: https://github.com/fechanique/cordova-plugin-fcm

As far as I can tell there're no plugins which accomplish all what you need. However..
can i reliably receive a remote notification, create a local one, and display that, and then in response to a notification with a scope of 'expire' or 'remove', delete a local notification so that my users don't see a duplication of information?
Most plugins tend to detect the status of the app and add a remote notification to the homescreen with the info you've pushed by default, is there a way to avoid this?
Yes, by using silent notifications and building the local notification by yourself.
For a project I'm working in, I modified the plugin cordova-plugin-fcm to add support for (local on demand) notifications dismiss/display, send multiple notifications to the cordova app, and some PRs that are not included yet. Also I build the notification by myself, to have full control of what is displayed. You can take a look at the code to get some ideas.
In brief it works like this:
Firstly, I send a "silent" push to the app, which is not displayed by Android:
{
"content_available": true, // IMPORTANT: For Apple -> content-available: 1, for firebase -> content_available: true
"priority": "high",
"to": "/topics/all", // or to a fcm token
"data"{
"title": "My title", // this implies that you display the notification by yourself
"body": "My body", // this implies that you display the notification by yourself
"type": "NEW_USER_MESSAGE", // only relevant to this project
"userId": "1", // only relevant to this project
"timestamp", "150000000"
}
}
Note: If the payload have the "notification": {} item, Android will display it on the system tray (if the app is in background).
https://firebase.google.com/docs/cloud-messaging/concept-options#notifications_and_data_messages
Secondly, when the push arrives to the app (in onMessageReceived()), I build the local notification, assigning it a TAG and an ID. This is the way you can use to dismiss it later.
For example, you could create a local notification with the TAG "NEW_USER_MESSAGE" and ID 1 (a constant indicating a state of the message, or the user ID for example). Also, Android will replace notifications with the same TAG and ID, so this is another way to automatically replace notifications (for example if you send a generic message, like "New update available").
public static String TYPE_NEW_USER_MESSAGE = "NEW_USER_MESSAGE";
public static String TYPE_USER_LEFT_ROOM = "USER_LEFT_ROOM";
NotificationManager notificationManager =
(NotificationManager) _ctx.getSystemService(Context.NOTIFICATION_SERVICE);
// based in the type of the message you've received, you can stylize the notification
if (type.equals( TYPE_USER_LEFT_ROOM )){
notificationBuilder.setColor(Color.RED);
notificationBuilder.setLights(Color.RED, 1000, 500);
}
else if (type.equals( TYPE_NEW_USER_MESSAGE )){
notificationBuilder.setColor(Color.BLUE);
notificationBuilder.setLights(Color.BLUE, 1000, 1000);
}
Notification n = notificationBuilder.build();
notificationManager.notify(type, userId, n);
One advantage of doing it in this way, is that you have full control of the notification to be displayed, so you can stylize it like you want.
If you want to discard expired messages, you can check out the elapsed time between the sent timestamp and the current timestamp:
java.util.Date now = new java.util.Date();
java.util.Date sent_timestamp = new java.util.Date( Long.valueOf(timestamp.toString()) );
final Long elapsed_time = ((now.getTime() - sent_timestamp.getTime()) / 1000);
Log.d(TAG, "New message. sent " + elapsed_time + "s ago");
Thirdly, when the user clicks on a notification Android will launch your app, and the plugin will send the payload of the push message to the cordova view (onNotificationReceived()).
Once your app is opened and you have received the push message, you can dismiss it adding a new action to the plugin:
onNotificationReceived(data){
if (data.wasTapped === true){
if (data.type === 'NEW_USER_MESSAGE'){
FCMPlugin.dismissNotification(NEW_USER_MESSAGE, 1);
}
}
}
The Android action:
else if (action.equals( ACTION_DISMISS_NOTIFICATION )) {
cordova.getThreadPool().execute(new Runnable() {
public void run() {
try{
Log.d(TAG, "FCMPlugin dismissNotificaton: " + args.getString(0)); //tag
NotificationManager nManager = (NotificationManager) mContext.getSystemService(Context.NOTIFICATION_SERVICE);
nManager.cancel(args.getString(0)/*NEW_USER_MESSAGE*/, args.getInt(1) /*1*/);
Log.d(TAG, "FCMPlugin dismissNotificaton() to remove: " + id); //tag
callbackContext.success();
}catch(Exception e){
callbackContext.error(e.getMessage());
}
}
});
https://github.com/TrustedCircles/cordova-plugin-fcm/blob/master/src/android/FCMPlugin.java#L286
And the method exposed to the cordova app:
// dismisses a notification by tag+id
FCMPlugin.prototype.dismissNotification = function( tag, userId, success, error ){
exec(success, error, "FCMPlugin", 'dismissNotification', [tag, userId]);
}
https://github.com/TrustedCircles/cordova-plugin-fcm/blob/master/www/FCMPlugin.js#L65

The only tricky bit with notifications in cordova/ionic is the JS part receiving the notification and triggering the Android code.
I used https://github.com/phonegap/phonegap-plugin-push library and its pretty straight forward.
There is a callback when notifications are received in JS(Cordova/Ionic), use this to render you notifications locally in Android.
P.S: Basel's answer tells you how to clear your notifications, so I decided to leave that bit out.

What notification system to use in a chat application?

I'm developing a chat application using Firebase Database in Android.
I've already done the core (chat and user's list activities), but I have yet to do the notification system.
I wanted to implement Google FCM as I am using firebase, but I find an hole in it, as it seems that I can not handle at all notifications delivered to iOs apps that are not in foreground.
As found in the Data notification documentation
On iOS, FCM stores the message and delivers it only when the app is in the foreground and has established a FCM connection. On Android, a client app receives a data message in onMessageReceived() and can handle the key-value pairs accordingly.
And I need to catch the data notification even when the app is in background, I need that specifically because I want to update my badge counter on the app icon to let the user know how many unread messages he has.
I'm now tryng the OneSignal solution can receive notification even when in background, it's free and interfaces with GCM. I'm sad to not stay with Google but if I can't update the badge count using FCM I have to look to an other side.
Any consideration will be appreciated.

Use below code for get badge from server when app is in background or not running because your FirebaseMessagingService is running.
If you have any doubts regarding show badge on app icon than comment it because just yesterday i did show badge on app icon.
public class Custom_FirebaseMessagingService extends FirebaseMessagingService {
private static final String TAG = "FirebaseMsgService";
//private Activity strPushClickDesti;
String activityName;
#Override
public void zzm(Intent intent) {
Log.i("uniqbadge", "zzm");
Set<String> keys = intent.getExtras().keySet();
for (String key : keys) {
try {
Log.i("uniq", " " + key + " " + intent.getExtras().get(key));
if (key.equals("badge")) {
String cnt = intent.getExtras().get(key).toString();
int badgeCount = Integer.valueOf(cnt);
Log.i("uniq", " badge count " + badgeCount);
ShortcutBadger.applyCount(this, badgeCount);
Log.i("uniq", " " + "end");
}
} catch (Exception e) {
Log.i("uniqbadge", "zzm Custom_FirebaseMessagingService" + e.getMessage());
}
}
super.zzm(intent);
}

There is in fact a feature explored by OneSignal to achieve this behavior. It is the content-available value in the notification payload. The good news is that is native to iOS 7 and above. So if you can customize the payload in FCM, it is possible. Just activate remote-notification in background modes and handle the badge update in application(didReceiveRemoteNotification:fetchCompletionHandler:) and you are good to go.

Message notifications and pull content

I know that this may possible be a duplicate question, but the other questions don't answer mine.
I am working on an app that pulls notifications (specifically notifications for new WhatsApp messages) from the status bar and reads their content. I have managed to pull the notification title and the message content.
The problem is, when more than one unread message is received, the notification switches from using EXTRA_TEXT to EXTRA_SUMMARY_TEXT (then returning e.g. "2 new messages" instead.
It must possible to separate the messages somehow, seeing as certain existing apps do it (e.g. Snowball combines all messages and displays them in one place, showing message content even when multiple messages have been received and are still unread).
I know that users can send messages via Intents. However, I cannot seem to access incoming intents and have, therefore, assumed that WhatsApp uses explicit intents to send messages.
Intent i = new Intent("com.test.testapp.NOTIFICATION_LISTENER");
Bundle extras = sbn.getNotification().extras;
if(sbn.getPackageName().contains("com.whatsapp"))
{
String title = extras.getString(Notification.EXTRA_TITLE);
String summary = extras.getString(Notification.EXTRA_SUMMARY_TEXT);
String msg = extras.getString(Notification.EXTRA_TEXT);
if(msg != null)
{
i.putExtra("notification_event", msg);
}
else
{
i.putExtra("notification_event", summary);
}
}
else
{
i.putExtra("notification_event","...");
}
sendBroadcast(i);
My question:
How can I display all received messages without getting "2 new messages" as content OR is there a better way of doing this?
I need to access message content, the sender's number and the time that the message was received, so that I can save it to a database.
Any help would be appreciated.

WhatsApp application has structure for sending notification like this :
Case Notification
Message comes from A : Hi Title : A Text: Hi
Message comes from A : How are you Title : A Text: How are you
Title : A Text: 2 new messages
Message comes from B : Hello Title : B Text: Hello
Title : B Text: 1 new message
Title : A Text: 2 new messages
Title : WhatsApp Text: 3 new messages from 2 conversation
---- Here comes the stacking ----
Message comes from C : Good work Title : C Text: Good work
Title : C Text: 1 new message
Title : B Text: 1 new message
Title : A Text: 2 new messages
Title : WhatsApp Text: 4 new messages from 3 conversation
---- This way when new sender message comes, previoud notifications also comes and we get callback in NotificationListener ----
Last notification comes with Title as Package Name : WhatsApp and Text as : X messages from Y Conversation
To get Text :
sbn.getNotification().extras.getCharSequence(Notification.EXTRA_TEXT).toString();
To get Title :
sbn.getNotification().extras.getCharSequence(Notification.EXTRA_TITLE).toString();
To work with this sturcture of stacking, we need to parse this notification stack and display only selective information in our application
I hope my answer will help and solve your query
This answer is given at : enter link description here