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chatRef1.addSnapshotListener(new EventListener<DocumentSnapshot>() {
@Override
public void onEvent(@Nullable DocumentSnapshot documentSnapshot, @Nullable FirebaseFirestoreException e) {
HashMap<String, Object> hashMap1 = new HashMap<>();
hashMap1.put("id", firebaseUser.getUid());
hashMap1.put("last_msg", message);
chatRef1.set(hashMap1);
}
});ВM
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