make a search in recylerview - firebase

Question

I want to make a search on recyclerview, but the data appears if the phone is turned off and then turned on again, why is that?
the example photo
the app
When i'm search the recylerview is blank
but when the phones turned off and then turn on again, the data is appear
here's the code in fragment class
//search
editText = view.findViewById(R.id.searchServant);
searchButton = view.findViewById(R.id.button2);
searchButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String s = editText.getText().toString();
firebaseSearch(s);
}
});
//RecylerviewDatabaseServant
recyclerViewdatabase = view.findViewById(R.id.recyclerViewServant);
mManager = new LinearLayoutManager(getContext());
recyclerViewdatabase.setLayoutManager(mManager);
FirebaseRecyclerOptions<Servant> options =
new FirebaseRecyclerOptions.Builder<Servant>().setQuery(FirebaseDatabase.getInstance().getReference().child("Servant")
, Servant.class)
.build();
servantAdapter = new ServantAdapter(options);
recyclerViewdatabase.setAdapter(servantAdapter);
//End
here the function firebase search
private void firebaseSearch(String s) {
FirebaseRecyclerOptions<Servant> options = new FirebaseRecyclerOptions.Builder<Servant>().setQuery(FirebaseDatabase.getInstance()
.getReference().child("Servant").orderByChild("name").startAt(s).endAt(s + "\uf8ff"), Servant.class).build();
servantAdapter = new ServantAdapter(options);
recyclerViewdatabase.setAdapter(servantAdapter);
}

Answer 1

Try add this line in You search query
private void firebaseSearch(String s) {
FirebaseRecyclerOptions<Servant> options = new FirebaseRecyclerOptions.Builder<Servant>().setQuery(FirebaseDatabase.getInstance()
.getReference().child("Servant").orderByChild("name").startAt(s).endAt(s + "\uf8ff"), Servant.class).build();
servantAdapter = new ServantAdapter(options);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager({**context**}));
recyclerViewdatabase.setAdapter(servantAdapter);
servantAdapter.startListening();
}