How to get text of Stacked Notifications in Android

Question

The question is how to get the TEXT (not title) field of all incoming notifications when they get stacked (like in Whatsapp).

Answer 1

I think this can help you:

CharSequence[] lines = 
extras.getCharSequenceArray(Notification.EXTRA_TEXT_LINES);
if(lines != null && lines.length > 0) {
   StringBuilder sb = new StringBuilder();
   for (CharSequence msg : lines)
      if (!TextUtils.isEmpty(msg)) {
         sb.append(msg.toString());
         sb.append('\n');
      }
   return sb.toString().trim();
}
CharSequence chars = 
extras.getCharSequence(Notification.EXTRA_BIG_TEXT);
if(!TextUtils.isEmpty(chars))
   return chars.toString();

Answer 2

If you're working with Android 7.0+, WhatsApp uses MessageStyle Expanded Notifications. Here - https://developer.android.com/training/notify-user/expanded.html#message-style

To retrieve all 5 messages from a notification like

MyFriend (5 messages)
testt

Do this:

Bundle extras = mysbn.getNotification().extras;
if ((Build.VERSION.SDK_INT >= Build.VERSION_CODES.N)){
        Parcelable b[] = (Parcelable[]) extras.get(Notification.EXTRA_MESSAGES);

        if(b != null){
            content = "";
            for (Parcelable tmp : b){

                Bundle msgBundle = (Bundle) tmp;
                content = content + msgBundle.getString("text") + "\n";

                /*Set<String> io = msgBundle.keySet(); // To get the keys available for this bundle*/

            }
        }
    }

Same as my answer here.

Answer 3

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

Answer 4

Only researched on WhatsApp with Accessibility service permission. all incoming notifications when they get stacked (like in Whatsapp), you can use AccessibilityEvent getRecord() method to extract context in stack. Content contains [sender, to, time, context, index] tested on Android 5.1 on MOTO G