java - What miss, with connect Firestore and ListView for random results in sample?

Question

I try to connect my Firestore to ListView. With my Query there are put 20 records and 3 random of it, put in ArrayList(randomPlaceList), then I logical try to include this ArrayList to my custom adapter. But I miss something..

EDITED with some change variables; Now I have this error:

Process: com.example.arara.myapplication, PID: 10283 java.lang.IndexOutOfBoundsException: Index: 4, Size: 0 at java.util.ArrayList.get(ArrayList.java:437) at com.example.arara.myapplication.MainActivity$1.onComplete(MainActivity.java:46)

In this line:

Peoples item = randomPlaceList.get(randomIndex);

ListViewPlaces class:

public class MainActivity extends AppCompatActivity {

FirebaseFirestore rootRef = FirebaseFirestore.getInstance();
CollectionReference placeRef = rootRef.collection("peoples");

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

    placeRef.get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
        @Override
        public void onComplete(Task<QuerySnapshot> task) {
            if (task.isSuccessful()) {
                List<Peoples> peoplesList = new ArrayList<>();
                for (DocumentSnapshot document : task.getResult()) {
                    Peoples peoples = document.toObject(Peoples.class);
                    System.out.println(peoples);
                    peoplesList.add(peoples);
                }
                if (peoplesList.size() > 0) {
                    System.out.println(peoplesList);
                    int placeCount = peoplesList.size();
                    Random randomGenerator = new Random();
                    List<Peoples> randomPlaceList = new ArrayList<>();
                    for (int i = 0; i < 3; i++) {
                        int randomIndex = randomGenerator.nextInt(placeCount);;
                        Peoples item = randomPlaceList.get(randomIndex);
                        randomPlaceList.add(item);
                    }
                    ListView mListView = findViewById(R.id.place_list);
                    PeoplesAdapter peoplesAdapter = new PeoplesAdapter(getBaseContext(), randomPlaceList);
                    mListView.setAdapter(peoplesAdapter);
                }
            }
        }
    });
}

}

Adapter class:

public class PeoplesAdapter extends ArrayAdapter<Peoples> {
public PeoplesAdapter(Context context, List<Peoples> list) {
    super(context, 0, list);
}

@NonNull
@Override
public View getView(int position, View listItemView, @NonNull ViewGroup parent) {
    if (listItemView == null) {
        listItemView = LayoutInflater.from(getContext()).inflate(android.R.layout.simple_list_item_1, parent, false);
    }
    Peoples peoples = getItem(position);
    Log.d("TAG", peoples.getName());
    String name = peoples.getName();
    ((TextView) listItemView).setText(name);

    return listItemView;
}
}

And Model class:

class Peoples {
private String name, age;

public Peoples() {}

public Peoples(String name, String age) {
    this.name = name;
    this.age = age;
}

public String getName() {
    return name;
}

public String getAge() {
    return age;
}
}

Firestore database:

Answer 1

Waitting for answers