单独修改ListView中的ProgressBars

public class CustomAdapter extends BaseAdapter {
    private List<Item> itemList;
    private LayoutInflater inflater;

    public CustomAdapter(Context context, List<Item> itemList) {
        this.itemList = itemList;
        inflater = LayoutInflater.from(context);
    }

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

    @Override
    public Object getItem(int position) {
        return itemList.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 = inflater.inflate(R.layout.list_item, parent, false);
            holder = new ViewHolder();
            holder.progressBar = convertView.findViewById(R.id.progress_bar);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        Item item = itemList.get(position);
        holder.progressBar.setProgress(item.getProgress());

        return convertView;
    }

    private static class ViewHolder {
        ProgressBar progressBar;
    }
}

<ListView
    android:id="@+id/list_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

ListView listView = findViewById(R.id.list_view);
CustomAdapter adapter = new CustomAdapter(this, itemList);
listView.setAdapter(adapter);

itemList.get(position).setProgress(newProgress);
adapter.notifyDataSetChanged();