android - 将 ListView 更改为 ExpandableListView

Question

我的 Activity 中有一个 ListView，但现在我想将其更改为 ExpandableListView。我是否需要完全更改我的 ListView ，或者我可以将 expandableListView 添加到我现有的 ListView 中？

Answer 1

这是我使用的示例。您可以更改它并使用它。

// ListView 代码

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();
            }

        }



 // code for adapter



/* Creating the Hashmap for the row */
                ArrayList<HashMap<String, String>> result = new ArrayList<HashMap<String, String>>();

                @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());

                    }

                }
            }