Firebase OutOfMemoryError at java.lang.String.?

Question

Android

Good afternoon, an application using data from a firebase database is crashing.
There is so much data, the document is obtained at 15 mb and is constantly growing, but how to implement all this then. I didn't quite understand how it works.

// onCreateView
databaseRef = FirebaseDatabase.getInstance().getReference().child("notifications");
        Query queryToAll = databaseRef.orderByChild("to").equalTo("/topics/all");
        Query queryToCity = databaseRef.orderByChild("to").equalTo("/topics/"+region);
        Query queryToCodeAndRegion = databaseRef.orderByChild("code").equalTo(region+"_"+code);
        queryToCodeAndRegion.addChildEventListener(this);
        queryToAll.addChildEventListener(this);
        queryToCity.addChildEventListener(this);
       .........
@Override
    public void onChildAdded(DataSnapshot dataSnapshot, String s) {
        if (dataSnapshot.hasChildren()){
            FireBaseNotification notification = dataSnapshot.getValue(FireBaseNotification.class);
               if (notification != null) {
            notification.setId(dataSnapshot.getKey());
            switch (notification.getTag()){
                case WEB:
                    notificationsListWeb.add(notification);
                    notificationsGroup.put(WEB, notificationsListWeb);
                    break;
                case ODIN_C:
                    notificationsList1c.add(notification);
                    notificationsGroup.put(ODIN_C, notificationsList1c);
                    break;
                case MEscort:
                    notificationsListMEscort.add(notification);
                    notificationsGroup.put(MEscort, notificationsListMEscort);
                    break;
            }
            adapter.notifyDataSetChanged();
        }
          }
}

Answer 1

1) Try to put (for a quick solution) in the manifest android:largeHeap=true
2) Modernize the data structure in Firebase. The fact is that, according to its structure, it does not send you changes, but sends a snapshot of the latest changes - hence 15mb.