如何在Android上的ListActivity中实现上下文菜单？

public class MyAdapter extends BaseAdapter {
    private Context mContext;
    private List<String> mData;

    public MyAdapter(Context context, List<String> data) {
        mContext = context;
        mData = data;
    }

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

    @Override
    public Object getItem(int position) {
        return mData.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(mContext).inflate(R.layout.list_item, parent, false);
            holder = new ViewHolder();
            holder.textView = (TextView) convertView.findViewById(R.id.text_view);
            holder.textView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    // 创建上下文菜单
                    registerForContextMenu(v);
                    // 显示上下文菜单
                    openContextMenu(v);
                }
            });
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        holder.textView.setText(mData.get(position));

        return convertView;
    }

    private static class ViewHolder {
        TextView textView;
    }
}

public class MyListActivity extends ListActivity {
    private List<String> mData = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // 添加一些数据
        mData.add("Item 1");
        mData.add("Item 2");
        mData.add("Item 3");

        MyAdapter adapter = new MyAdapter(this, mData);
        setListAdapter(adapter);
    }

    @Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
        super.onCreateContextMenu(menu, v, menuInfo);

        // 添加菜单项
        MenuItem menuItem1 = menu.add("Menu Item 1");
        MenuItem menuItem2 = menu.add("Menu Item 2");

        // 为菜单项设置OnClickListener
        menuItem1.setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem item) {
                // 执行相应的操作
                return true;
            }
        });

        menuItem2.setOnMenuItemClickListener(new MenuItem.OnMenuItemClickListener() {
            @Override
            public boolean onMenuItemClick(MenuItem item) {
                // 执行相应的操作
                return true;
            }
        });
    }
}