如何在android微调器中显示默认列表

<!-- list_item_default.xml -->
<TextView
    android:id="@+id/textViewDefaultItem"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textSize="16sp"
    android:padding="10dp" />

// DefaultListAdapter.java
public class DefaultListAdapter extends ArrayAdapter<String> {
    private Context mContext;
    private List<String> mDefaultList;

    public DefaultListAdapter(Context context, List<String> defaultList) {
        super(context, R.layout.list_item_default, defaultList);
        mContext = context;
        mDefaultList = defaultList;
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        if (convertView == null) {
            LayoutInflater inflater = LayoutInflater.from(mContext);
            convertView = inflater.inflate(R.layout.list_item_default, parent, false);
        }

        TextView textViewDefaultItem = convertView.findViewById(R.id.textViewDefaultItem);
        String item = mDefaultList.get(position);
        textViewDefaultItem.setText(item);

        return convertView;
    }
}

// MainActivity.java
public class MainActivity extends AppCompatActivity {
    private ListView mListViewDefault;
    private DefaultListAdapter mDefaultListAdapter;

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

        mListViewDefault = findViewById(R.id.listViewDefault);

        List<String> defaultList = prepareDefaultList(); // 准备默认列表数据
        mDefaultListAdapter = new DefaultListAdapter(this, defaultList);
        mListViewDefault.setAdapter(mDefaultListAdapter);
    }

    private List<String> prepareDefaultList() {
        // 准备默认列表数据
        List<String> defaultList = new ArrayList<>();
        defaultList.add("Item 1");
        defaultList.add("Item 2");
        defaultList.add("Item 3");
        return defaultList;
    }
}

<!-- activity_main.xml -->
<ListView
    android:id="@+id/listViewDefault"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />