如何在Android的框架布局上显示可扩展布局？

<ExpandableListView
    android:id="@+id/expandableListView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

public class ExpandableListAdapter extends BaseExpandableListAdapter {
    // 实现适配器的相关方法
    // ...
}

ExpandableListView expandableListView = findViewById(R.id.expandableListView);
ExpandableListAdapter adapter = new ExpandableListAdapter();
expandableListView.setAdapter(adapter);

@Override
public int getGroupCount() {
    // 返回组的数量
}

@Override
public int getChildrenCount(int groupPosition) {
    // 返回指定组中子项的数量
}

@Override
public Object getGroup(int groupPosition) {
    // 返回指定组的数据对象
}

@Override
public Object getChild(int groupPosition, int childPosition) {
    // 返回指定组中指定子项的数据对象
}

@Override
public long getGroupId(int groupPosition) {
    // 返回指定组的ID
}

@Override
public long getChildId(int groupPosition, int childPosition) {
    // 返回指定组中指定子项的ID
}

@Override
public boolean hasStableIds() {
    // 返回是否具有稳定的ID
}

@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
    // 返回指定组的视图
}

@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
    // 返回指定组中指定子项的视图
}

@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
    // 返回指定子项是否可选
}