You forgot adding start listening method for your adapters.

@Override
protected void onStart() {
super.onStart();
adapter.startListening();
}

I made FirestoreRecycleview in home-menu, when run app FirestoreRecycler work properly but when I open other Menu in Bottom Navbar, FirestoreReclyclerview not Load data

for Example :

• I Have Bottom Navbar with 2 Fragment A and B
• In Fragment A, I Have A RecycleView with Adapter From FirestoreRecyclerAdapter
• when I open Fragment B and open Fragment A again, fragment A doesn’t show Data in recyclerview

This is When run app in First Time :

This is After I Click other navbar button and open this fragment again :

this is my code that I call in onCreate()

 private void setkelaslist() {
        Query query = fdb.collection("kelas").whereEqualTo("email",email_txt);
        FirestoreRecyclerOptions<kelas_profil> options = new FirestoreRecyclerOptions.Builder<kelas_profil>().
                setQuery(query,kelas_profil.class)
                .build();
        adapter = new listkelasadapter(options,this);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
        adapter.startListening();
        adapter.notifyDataSetChanged();
        recyclerView.setAdapter(adapter);
    }

Another request: one more question, I delete items with a button click, it is deleted but when I create a new item with same data, in Toast it says Complete but it doesn’t add data.