我已经有一个列表视图，我想将其转换为可扩展的列表视图

Posted 2023-05-07

【中文标题】我已经有一个列表视图，我想将其转换为可扩展的列表视图

【英文标题】：I already have a listview i want to convert it into expandable ListView

【发布时间】：2015-06-28 03:33:45

【问题描述】：

以下是我的基本适配器代码。我将使用这个类作为ListView 的适配器。

public class CustombaseAdapterTxnCartSelect extends BaseAdapter

    private Context mContext;
    private List<RowItemTxnCartSelect> mRowItems;

    TextView standDesc, seats, totalTicketTariff, eventDesc;

    public CustombaseAdapterTxnCartSelect(Context context, List<RowItemTxnCartSelect> rowItems) 
        mContext = context;
        mRowItems = rowItems;       
    

    @Override
    public int getCount() 
        return mRowItems.size();
    

    @Override
    public Object getItem(int position) 
        return mRowItems.get(position);
    

    @Override
    public long getItemId(int position) 
        return mRowItems.indexOf(getItem(position));
    

    @Override
    public View getView(int position, View convertView, ViewGroup parent) 
        convertView = null;

        LayoutInflater mInflator = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = mInflator.inflate(R.layout.event_layout_txn__cart_select, null);
        standDesc = (TextView) convertView.findViewById(R.id.textViewTxnCartSelectStandDesc);
        seats = (TextView) convertView.findViewById(R.id.textViewTxnCartSelectSeats);
        totalTicketTariff = (TextView) convertView.findViewById(R.id.textViewTxnCartSelectTotalTicketTariff);
        eventDesc = (TextView) convertView.findViewById(R.id.textViewEventDesc);

        RowItemTxnCartSelect row = (RowItemTxnCartSelect) getItem(position);
        standDesc.setText(row.getmStandDesc());
        seats.setText(row.getmSeats());
        totalTicketTariff.setText(row.getMtotalTicketTariff());
        eventDesc.setText(row.getmEventDesc());

        return convertView;
    

我只是想把它转换成一个可扩展的列表视图我不清楚我要添加什么。

【问题讨论】：

代码整理。一些语法修复。

【参考方案1】：

也许你可以这样：

public class FevList extends ExpandableListActivity 
    String title;
    String url;
    SQLiteDatabase database;
    DbUtil db;
    HashMap<String, String> map = new HashMap<String, String>();
    ArrayList<HashMap<String, String>> subjectList = new ArrayList<HashMap<String, String>>();


    @SuppressWarnings("unchecked")
    @Override
    protected void onCreate(Bundle savedInstanceState) 
        try 
            super.onCreate(savedInstanceState);
            setContentView(R.layout.exlist);
            db = new DbUtil();
            database = db.openConnection(this);
            // Thread for getting values of title from DataBase.
            SimpleExpandableListAdapter expListAdapter = new SimpleExpandableListAdapter(
                    this, createGroupList(), R.layout.group_row,
                    new String[]  "subject" , new int[]  R.id.row_name ,
                    createChildList(), R.layout.child_row,
                    new String[]  "title" , new int[]  R.id.grp_child );
            setListAdapter(expListAdapter);
            registerForContextMenu(getExpandableListView());
         catch (Exception e) 
            e.printStackTrace();
        

    

// 适配器代码

/* 为行创建 Hashmap */ ArrayList> 结果 = 新的 ArrayList>();

            @SuppressWarnings("unchecked")
            private List createGroupList() 

// write your code here.

                return (List) result;

            

            /* creatin the HashMap for the children */

            @SuppressWarnings("unchecked")
            private List createChildList() 

// write your code here.
                return result;
            

            public void onContentChanged() 

                System.out.println("onContentChanged");

                super.onContentChanged();

            

            /* This function is called on each child click */

            public boolean onChildClick(ExpandableListView parent, View v,
                    int groupPosition, int childPosition, long id) 

// write your code here.

                return true;

            

            /* This function is called on expansion of the group */

            public void onGroupExpand(int groupPosition) 

                try 

                    System.out.println("Group exapanding Listener => groupPosition = "
                            + groupPosition);

                 catch (Exception e) 

                    System.out.println(" groupPosition Errrr +++ " + e.getMessage());

                

            
        

这是一个sn-p，你可以参考this

【参考方案2】：

Here 是一个开源示例项目，用于演示 ExpandableListView。这是开始使用可扩展列表视图的好例子。