在fragments中使用listview

要在Fragment中使用ListView，你需要遵循以下步骤：

1. 在布局文件中添加ListView组件。例如：

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

2. 在Fragment的onCreateView方法中获取ListView的引用。例如：

public class MyFragment extends Fragment {
    private ListView listView;
    
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_layout, container, false);
        listView = (ListView) view.findViewById(R.id.listview);
        return view;
    }
}

3. 为ListView设置Adapter。例如：

public class MyFragment extends Fragment {
    private ListView listView;
    
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_layout, container, false);
        listView = (ListView) view.findViewById(R.id.listview);
        
        // create adapter here
        MyAdapter adapter = new MyAdapter(getActivity(), myList);
        listView.setAdapter(adapter);
        
        return view;
    }
}

其中，MyAdapter是你自己创建的Adapter类，myList是你要显示在ListView中的数据列表。

4. 实现Adapter类。例如：

public class MyAdapter extends ArrayAdapter<String> {
    private Context context;
    private List<String> list;
    
    public MyAdapter(Context context, List<String> list) {
        super(context, R.layout.list_item_layout, list);
        this.context = context;
        this.list = list;
    }
    
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if (convertView == null) {
            convertView = LayoutInflater.from(context).inflate(R.layout.list_item_layout, parent, false);
            holder = new ViewHolder();
            holder.textView = (TextView) convertView.findViewById(R.id.textview);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }
        
        holder.textView.setText(list.get(position));
        return convertView;
    }
    
    static class ViewHolder {
        TextView textView;
    }
}

其中，list_item_layout是ListView中每个item显示的布局文件，ViewHolder是用来优化ListView性能的类。

这样，你就可以在Fragment中使用ListView了。