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Clash Royale CLAN TAG#URR8PPP

How to populate an ArrayAdapter with a List of objects from a Firebase Database?

I'm trying to populate my ListView with User objects from Firebase Database. I've seen some people use RecyclerView but I cannot get RecyclerView to work on my Android Studio (maybe i'm using incompatible dependencies).

Anyway here is my code:

// necessary imports

public class List extends AppCompatActivity

ListView usersList;
private DatabaseReference userDatabase;
ArrayList<String> list = new ArrayList<>();


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

usersList = (ListView) findViewById(R.id.list_users);


userDatabase = FirebaseDatabase.getInstance().getReference().child("Users");






@Override
protected void onStart()
super.onStart();

// Populate ArrayAdapter with User objects from Firebase Database.
ArrayAdapter<Users> Adapter = new ArrayAdapter<Users>(this, Users.class, android.R.layout.simple_expandable_list_item_1, userDatabase)

// Populate here, don't know what to do.


;

usersList.setAdapter(Adapter);

usersList.setOnItemClickListener(new AdapterView.OnItemClickListener()
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l)
Users.connectTo = list.get(i);
Intent chatActivity = new Intent(List.this, ChatActivity.class);
startActivity(chatActivity);


);









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