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列表视图，或者我可以将 expandableListView 添加到我现有的列表视图中吗？

Answer 1

这是我使用的示例..您可以更改并使用它。

// 列表视图代码

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());

                    }

                }
            }

Answer 2

尝试这样的事情：

public class PharmaciesListScreen extends ExpandableListActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ExpandableListView expandbleLis = getExpandableListView();

        List<RegionItem> regionsList = new RegionsDBUtils(getApplication())
                .getAllRegions();

        PharmaciesListAdapter mNewAdapter = new PharmaciesListAdapter(regionsList);
        mNewAdapter
                .setInflater((LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE), this);
        getExpandableListView().setAdapter(mNewAdapter);
    }

适配器代码：

public class PharmaciesListAdapter extends BaseExpandableListAdapter {

 @Override
public View getChildView(int groupPosition, final int childPosition,
            boolean isLastChild, View convertView, ViewGroup parent) {
       //set up here you child elements.
       //you can use inflater here
    }

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
        if (convertView == null) {
            convertView = minflater.inflate(R.layout.grouprow, null);
        }
        ((CheckedTextView) convertView).setText(mRegionsList.get(groupPosition).region);
        ((CheckedTextView) convertView).setChecked(isExpanded);
        return convertView;
    }

public void setInflater(LayoutInflater mInflater, Activity act) {
    this.minflater = mInflater;
    activity = act;
}
}

注意：在适配器中，您需要实现更多方法。另外，看看这篇文章： Android ExpandableListView - 寻找教程

Answer 3

“这是 ExpandableListView 的一个很好的例子”

ExpandableListView 继承自 ListView。它向 ListView 实现添加了更多内容，例如扩展和折叠属性、标题和子视图等。从 listView 移动到可扩展列表视图时，您需要在以下方面进行更改：

1. XML 视图
2. 实现 ExpandableListAdapter 的适配器
3. 在设置适配器时，您需要新的 ExpandableListAdapter（这个，每个列表的 DataHeader 列表，要在每个标题下填充的 DataChild 列表）；