Trying to set a condition when arraylist.size > 1 layout is gone and array is visible and vice versa

Question

Trying to get layout to change when my array has data inputted in it, currently it only displays the buttons even when there data inside the arraylist. Here I am trying to call the eventchange if it has the correct conditions. Currently it does not work and it still just displays the buttons. I dont know what it is missing right now hopefully anyone can help thank you.

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_home_page);
    Button addMed = (Button) findViewById(R.id.add_medications_btn);
    Button addHM = (Button) findViewById(R.id.add_measurements_btn);
    rootAuthen = FirebaseAuth.getInstance();

    recyclerView = findViewById(R.id.recyclerViewHome);
    recyclerView.setHasFixedSize(true);
    recyclerView.setLayoutManager(new LinearLayoutManager(this));
    myArrayList = new ArrayList<medication_info>();
    myAdapter = new myHomeAdpater(home_page.this, myArrayList);
    EventChangeListener();
    recyclerView.setAdapter(myAdapter);
    if (myArrayList.size() == 0) {
        recyclerView.setVisibility(View.GONE);
        addMed.setVisibility(View.VISIBLE);
        addHM.setVisibility(View.VISIBLE);
        EventChangeListener();
    }
    else if(myArrayList.size() > 0)
    {
        recyclerView.setVisibility(View.VISIBLE);
        addMed.setVisibility(View.GONE);
        addHM.setVisibility(View.GONE);
        EventChangeListener();
    }
}

private void EventChangeListener() {
    FirebaseUser currentFirebaseUser = FirebaseAuth.getInstance().getCurrentUser();
    fstore.document("users/"+currentFirebaseUser.getUid()).collection("New Medications")
            .orderBy("Medication", Query.Direction.ASCENDING).addSnapshotListener(new EventListener<QuerySnapshot>() {
        @Override
        public void onEvent(@Nullable QuerySnapshot queryDocumentSnapshots, @Nullable FirebaseFirestoreException e) {
            if(e != null)
            {
                if(progressDialog.isShowing())
                    progressDialog.dismiss();
                Log.e("Firestore error", e.getMessage());
                return;
            }
            for(DocumentChange dc : queryDocumentSnapshots.getDocumentChanges())
            {
                if(dc.getType() == DocumentChange.Type.ADDED) {
                    medication_info m = dc.getDocument().toObject(medication_info.class);
                    m.setId(dc.getDocument().getId());
                    myArrayList.add(m);

                }
                myAdapter.notifyDataSetChanged();
                if(progressDialog.isShowing()) {
                    progressDialog.dismiss();
                }
            }