如何在android的listview中添加进度指示器，如wifi设置

// 自定义适配器
public class MyAdapter extends BaseAdapter {
    private List<String> data; // 数据列表
    private boolean isLoading; // 数据加载状态

    public MyAdapter(List<String> data) {
        this.data = data;
        this.isLoading = false;
    }

    public void setLoading(boolean isLoading) {
        this.isLoading = isLoading;
    }

    @Override
    public int getCount() {
        return data.size();
    }

    @Override
    public Object getItem(int position) {
        return data.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if (convertView == null) {
            convertView = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item, parent, false);
            holder = new ViewHolder();
            holder.progressBar = convertView.findViewById(R.id.progress_bar);
            holder.textView = convertView.findViewById(R.id.text_view);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        if (isLoading) {
            holder.progressBar.setVisibility(View.VISIBLE);
            holder.textView.setVisibility(View.GONE);
        } else {
            holder.progressBar.setVisibility(View.GONE);
            holder.textView.setVisibility(View.VISIBLE);
            holder.textView.setText(data.get(position));
        }

        return convertView;
    }

    static class ViewHolder {
        ProgressBar progressBar;
        TextView textView;
    }
}

// 在Activity或Fragment中使用适配器
public class MainActivity extends AppCompatActivity {
    private ListView listView;
    private MyAdapter adapter;
    private List<String> data;

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

        listView = findViewById(R.id.list_view);
        data = new ArrayList<>();
        adapter = new MyAdapter(data);
        listView.setAdapter(adapter);

        // 模拟加载数据
        loadData();
    }

    private void loadData() {
        // 显示进度指示器
        adapter.setLoading(true);
        adapter.notifyDataSetChanged();

        // 模拟异步加载数据
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                // 加载完成，更新数据
                data.add("Item 1");
                data.add("Item 2");
                data.add("Item 3");

                // 隐藏进度指示器
                adapter.setLoading(false);
                adapter.notifyDataSetChanged();
            }
        }, 2000);
    }
}