问ListView不显示来自firebase的数据

EN

public class CitiesList extends AppCompatActivity {

DatabaseReference databasePaths;
private ListView ListViewCities;
private ArrayList<String> ArrayListCities;
private ArrayAdapter<String> adapterCities;
Paths info;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_cities_list);

    ListViewCities = (ListView) findViewById(R.id.ListViewCities);
    ArrayListCities = new ArrayList<>();

    databasePaths = FirebaseDatabase.getInstance().getReference("Paths");

    databasePaths.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {

            for (DataSnapshot items: dataSnapshot.getChildren())
            {
                info = items.getValue(Paths.class);
                ArrayListCities.add(info.city);

            }

            adapterCities = new ArrayAdapter<>(CitiesList.this, android.R.layout.simple_list_item_1);
            ListViewCities.setAdapter(adapterCities);

        }

        @Override
        public void onCancelled(@NonNull DatabaseError databaseError) {

        }
    });




}}